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MC145010P Photoelectric Smoke Detector IC | NXP
MC145010P

MC145010P Photoelectric Smoke Detector IC | NXP

The NXP MC145010P is a CMOS photoelectric smoke-detector integrated circuit with an I/O interface, a supply current of 12 µA, and a 16-pin through-hole DIP package. It is designed to operate with an infrared photoelectric chamber and contains the low-power analog and digital circuitry required to evaluate smoke-related optical conditions. The device supports voltage output and includes an interconnectable I/O function for linking smoke-detector units. A photoelectric smoke detector IC is a specialized sensor-interface and signal-processing component. Unlike a simple photointerrupter, it coordinates an infrared light source, an optical chamber, and detection electronics within the broader smoke-alarm system. The MC145010 family belongs to the CMOS integrated-circuit hierarchy and is intended for compact, low-power residential and commercial alarm equipment where response accuracy and standby power are important. The principal operating characteristics include very-low-power CMOS circuitry, a 12 µA supply current, photoelectric input sensing, voltage output, and an I/O pin that can be interconnected with other detector units. The I/O arrangement permits up to 40 units to share common signaling according to the manufacturer documentation. A local smoke condition activates the short-circuit-protected I/O driver to notify remotely connected units and can also support functions such as escape-light activation. Technically, the MC145010P combines analog detection functions with digital control and signaling in one package. The analog section interfaces with the infrared photoelectric chamber, while the digital section manages detector behavior, output signaling, and inter-unit communication. This integration reduces the number of discrete components required in a smoke-alarm design while maintaining a very-low 12 µA supply current. Its 16-pin DIP format also supports through-hole assembly and hand-repairable industrial appliance construction. Typical applications include residential photoelectric smoke alarms, commercial building alarm panels, interconnected multi-unit smoke-detection systems, and low-power safety appliances. The device is particularly appropriate where an infrared chamber is used instead of an ionization chamber and where low standby consumption supports long-lived battery operation. The I/O function can connect detectors across a larger installation so that a local alarm condition can be communicated to remote units. When designing around the MC145010P, follow the manufacturer pin-description and maximum-rating tables when assigning chamber, supply, output, and I/O connections. Preserve the recommended bypass and interconnection arrangements, and verify that the detector’s electrical thresholds match the selected chamber and infrared emitter. Because the I/O line can connect multiple units, check noise immunity, fault propagation, and short-circuit behavior across the completed system. This page organizes the product specifications, sourcing information, application guidance, and verified references for engineers evaluating the MC145010P. It also distinguishes a verified drop-in replacement from related parts that cannot be assumed to share the same footprint, preventing a functionally similar component from being treated as a safe PCB-level substitution.

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MC145011P Photoelectric Smoke Detector IC | NXP
MC145011P

MC145011P Photoelectric Smoke Detector IC | NXP

NXP Semiconductors MC145011P is a CMOS photoelectric smoke detector interface IC designed for line-powered smoke-detector applications. It accepts an infrared photoelectric chamber, combines very-low-power analog and digital circuitry, and includes an I/O function for detector-system integration. The device is packaged as a 16-pin plastic dual in-line package, identified by the MC145011P ordering code. A photoelectric smoke detector IC is a specialized interface circuit that connects an optical sensing chamber to the rest of an alarm system. Its internal analog and digital sections condition the chamber signal, evaluate smoke-related conditions, and support low-power operation. In the broader device hierarchy, the MC145011P belongs to sensor and detector interface ICs, connecting a physical sensing element to a line-powered embedded alarm system. The principal feature is the CMOS implementation described for the MC145011 family, combining analog signal processing with digital control while emphasizing low power consumption. The IC is intended to operate with an infrared photoelectric chamber rather than relying on a purely ionization-based sensing arrangement. Its I/O capability allows the detector assembly to participate in system signaling and alarm-state control without requiring every function to be implemented by a separate microcontroller. The MC145011 family architecture is intended for compact, battery-conscious alarm products. Low-power operation is particularly important because residential smoke alarms are expected to remain installed for years and often derive operating energy from a line-connected alarm circuit. The integrated analog and digital circuitry reduces the external support circuitry required for optical chamber signal conditioning, threshold evaluation, and system interfacing. Typical applications include residential photoelectric smoke alarms, commercial alarm panels, and other line-powered fire-detection products. A typical design places the MC145011P beside an infrared photoelectric chamber, connects the chamber elements and required timing or filtering components, and uses the I/O interface to communicate with the alarm system. Exact component values, operating limits, timing thresholds, and test points should be selected from the manufacturer application guidance rather than inferred from general smoke-detector practice. Designers should preserve the pin assignment and layout architecture of the original MC145011P design when reusing an existing printed circuit board. The 16-pin plastic DIP package facilitates through-hole assembly and inspection, but its larger footprint differs from modern surface-mount detector-controller packages. Validate chamber sensitivity, alarm thresholds, startup behavior, standby current, and regulatory performance on the final mechanical and optical assembly. This product page combines the identified package and application characteristics with practical guidance for smoke-alarm integration. It also distinguishes the verified MC145011P identity from unconfirmed replacement devices, helping engineers decide when an existing footprint can be reused and when a redesigned detector interface is required.

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MC145012P Photoelectric Smoke Detector IC | NXP
MC145012P

MC145012P Photoelectric Smoke Detector IC | NXP

The NXP Semiconductors MC145012P is a CMOS photoelectric smoke detector integrated circuit with an I/O interface and temporal-pattern horn driver, designed for use with an infrared photoelectric chamber. Its stated operating voltage range is 6 V to 12 V, its average supply current is 8 µA, and it is supplied in a 16-pin plastic dual in-line package. A photoelectric smoke detector is a safety sensor that detects airborne smoke or other aerosols through light scattering. The MC145012 integrates low-power analog and digital circuitry, an infrared sensing interface, an I/O connection for unit interconnections, and the timing and drive functions required for a pulsed horn. This places the component within the hierarchy of sensor interface IC, smoke detector circuit, alarm-system component, and integrated circuit. The principal functional features are photoelectric chamber support, I/O capability, and temporal-pattern horn drive. The low average supply current of 8 µA is particularly important for battery-backed household alarms because it reduces standby energy consumption. The 6 V to 12 V operating range is compatible with common alarm-system supply arrangements, while the I/O pin provides a path for coordinating interconnected smoke alarms. Internally, the device combines sophisticated very-low-power analog circuitry with digital control and timing functions. Detection occurs when scattered infrared light from smoke particles or other aerosols reaches the sensing input. The detector circuitry evaluates this signal and, upon a detected alarm condition, causes the horn output to follow a pulsating temporal pattern. The manufacturer identifies the circuit as designed for operation in compliance with UL217 and UL268. Typical applications include residential photoelectric smoke alarms, interconnected smoke-alarm networks, commercial building alarm panels, and low-power battery-operated safety products. The same device can serve both single-unit and interconnected alarm designs because its I/O pin supports coordination between multiple detectors, while the horn-driver section provides the required temporal signaling output. A key implementation consideration is the relationship between the chamber, analog signal path, and alarm timing. Component placement, grounding, supply bypassing, and the external chamber interface should follow the manufacturer application circuit to preserve low-noise detection and reliable alarm signaling. The plastic DIP package also requires adequate spacing from heat sources and careful observation of lead orientation during assembly. This product summary consolidates the manufacturer identification, functional description, operating limits, package information, and design intent into an engineering-focused reference. It also distinguishes the MC145012P from generic smoke-detector transistors by documenting its complete photoelectric detection, I/O, and temporal horn-drive roles in one component.

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MC145017P - Low-Power Ionization Smoke Detector IC | NXP
MC145017P

MC145017P - Low-Power Ionization Smoke Detector IC | NXP

NXP Semiconductors MC145017P is a low-power CMOS ionization smoke detector IC with a temporal-pattern horn driver, a 12 µA supply current, and a 16-pin PDIP package. Designed for use with an external ionization chamber, the device detects smoke, evaluates the chamber signal, and activates an external piezoelectric transducer through its internal horn-driver circuitry. Its operating-temperature range is -10°C to 60°C. An ionization smoke detector is a safety appliance that uses a radiation-based sensing chamber to identify airborne smoke particles. The MC145017 belongs to the sensor and detector interface hierarchy: it accepts an analog signal from the ionization chamber, applies internal detection logic, and controls a piezoelectric alarm. This architecture allows the sensitive ionization chamber, resistive components, and acoustic transducer to remain separate from the monolithic CMOS control circuit. The principal features of the MC145017P include very low 12 µA supply current, CMOS construction, an ionization-sensor input, a voltage output, and a temporal-pattern horn driver for an external piezoelectric transducer. Low supply current is important in battery-operated alarm systems because the detector electronics and sensing chamber must maintain useful standby and alarm performance without imposing excessive load on the backup battery. The MC145017 is designed to operate with an ionization chamber and a small number of external components. According to the NXP MC145017 datasheet, the associated circuit is intended for smoke-detector systems designed to comply with UL217 and UL268 specifications. The temporal horn pattern provides an intermittent alarm signal, while the low-power CMOS control section supports battery-powered installations where standby current is a primary design constraint. Typical applications include residential ionization smoke alarms, commercial smoke-detector modules, and legacy alarm-system replacements that retain the MC145017P pinout. Because the part is listed as obsolete, engineers should treat it primarily as a maintenance component for equipment already built around this device. New smoke-alarm designs should also evaluate current-generation detector ICs against applicable safety requirements rather than assuming an obsolete part can be introduced into a newly certified product. Circuit design requires careful treatment of the ionization-chamber interface, alarm-driver output, supply decoupling, and test points. Keep sensitive input routing away from the piezoelectric drive path, provide the external components specified by the manufacturer, and verify startup, smoke-entry, alarm-sound, and battery-fallback behavior in the complete detector assembly. The 16-pin PDIP package also requires adequate hole spacing and through-hole assembly clearance on the PCB. This page consolidates the MC145017P electrical characteristics, package information, application context, and selection considerations into an engineering-focused guide. It also documents the absence of a verified pin-compatible substitute set and highlights the product's obsolete lifecycle status, helping engineers distinguish usable legacy replacements from components that merely perform a similar smoke-detection function.

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MC145018P - Low-Power Ionization Smoke Detector IC | NXP
MC145018P

MC145018P - Low-Power Ionization Smoke Detector IC | NXP

The NXP Semiconductors MC145018P is a low-power CMOS ionization smoke detector interface with an interconnect output and temporal horn driver, designed for a 16-pin PDIP package. It accepts an ionization-chamber signal, evaluates smoke-related sensor activity, and drives an external piezoelectric transducer when an alarm condition is detected. The device uses a voltage-output sensor interface and operates with an external ionization chamber and a small number of supporting components. An ionization smoke detector is an electronic system that senses changes in the electrical behavior of an ionization chamber when smoke enters the chamber. The MC145018P belongs to the broader smoke-detector IC category, where it functions as a sensor interface and alarm-control device. Its internal circuitry connects the chamber to the detection electronics, coordinates the alarm signal, and provides a temporal horn-drive output for compatible sounders. The principal features include low-power CMOS operation, an ionization-sensor input, a voltage output, an interconnect function, and a temporal horn driver for an external piezoelectric transducer. The interconnect function supports installation schemes in which multiple detector units can be interconnected. The temporal horn driver provides the required switched drive for the alarm transducer rather than requiring a separate general-purpose driver circuit. The manufacturer identifies the MC145018 family as suitable for smoke-detector systems designed around UL 217 and UL 268 requirements. Its CMOS implementation targets low standby power, an important characteristic for continuously powered household and commercial alarm systems. The 16-pin PDIP package also supports through-hole assembly and inspection of an alarm product that must integrate an ionization chamber, discrete support components, a sound path, and the detector electronics. Typical applications include residential ionization smoke alarms, interconnected commercial alarm panels, portable detector modules, and retrofit assemblies where a legacy through-hole detector interface must be combined with an external piezoelectric horn. In these systems, the MC145018P handles the sensor-to-alarm path while the external chamber and transducer perform the physical sensing and sound-generation functions. Designers should follow the manufacturer datasheet for the ionization-chamber interface, interconnect wiring, external component values, test points, and horn-drive network. PCB layout should keep sensitive chamber connections short and isolated from the switched horn output. Adequate spacing between high-impedance sensor traces and buzzer-drive traces helps reduce false triggering, while correct grounding and stable supply bypassing remain essential for dependable alarm operation. This page organizes the device function, package information, sourcing paths, and design considerations into a focused engineering reference. It also distinguishes verified drop-in alternatives from package or functional substitutes, helping PCB designers avoid assuming that similarly described smoke-detector ICs can share the same footprint and alarm circuitry.

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MC145026D - 9-Line CMOS Encoder IC | NXP | 16-SOIC
MC145026D

MC145026D - 9-Line CMOS Encoder IC | NXP | 16-SOIC

The NXP Semiconductors MC145026D is a CMOS encoder integrated circuit designed to encode nine information lines and transmit the resulting data serially for remote-control and security applications. It supports nine input lines with either trinary low, high, or open states or binary low and high states, providing 19,683 possible trinary codes. The device is packaged in a 16-pin SOIC surface-mount package. A remote-control encoder IC is part of the broader interface and logic semiconductor hierarchy used to convert physical switch or control states into a compact serial signal. The MC145026D is intended for use with the MC145027 decoder family, allowing an encoded command or access-code word to be transmitted over a wired link and recovered by a compatible receiving circuit. Its repeated transmission behavior increases security by making the received word more resistant to simple single-event transmission errors. The encoder accepts a transmit-enable input to initiate a serial encoding sequence. During normal operation, the nine input pins can represent individual control functions such as multiple button states, access-code positions, or discrete logic conditions. The trinary mode is especially useful for systems that need more than binary combinations, while binary mode can simplify the interface when each control line is restricted to two valid states. The MC145026D is a dedicated encoder rather than a general-purpose microcontroller or communication transceiver. It does not require firmware, and its function is determined by the electrical state of the input pins and the transmit-enable control. This makes it suitable for simple, compact remote-control systems, keypad-based access devices, industrial control panels, and security-related key-entry modules where a hardware encoder is preferable to a programmable controller. As a legacy CMOS logic device, the principal design considerations are operating voltage compatibility, input-state definitions, timing around the transmit-enable signal, and correct receiver pairing. The MC145026D should be used with an appropriate MC145027-family decoder and verified against the NXP datasheet for pin functions, electrical timing, and operating conditions. The part’s documented lifecycle status is obsolete, so new designs should confirm availability and consider a supported alternative before committing to a production release. This page consolidates the manufacturer’s functional description, package information, application guidance, and replacement considerations into a design-focused reference for engineers evaluating the MC145026D in legacy remote-control systems.

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MC145026P - 9-Line CMOS Encoder | NXP | Remote Control
MC145026P

MC145026P - 9-Line CMOS Encoder | NXP | Remote Control

The NXP Semiconductors MC145026P is a CMOS remote-control encoder with nine input lines, serial data output, and a 16-pin through-hole PDIP package. Each of the nine encoded inputs can represent a low, high, or open state, allowing 19,683 possible codes. A low-level transmit-enable signal starts the transmission sequence, and the encoded word is sent twice to improve communication security. A remote-control encoder is a logic IC that converts a group of physical control inputs into a serial data stream suitable for transmission over a wired or wireless communications link. In the broader product hierarchy, it is a CMOS encoder within the interface-IC and logic-IC categories, connecting human-operated controls to an embedded control, communication, or automation system. The MC145026P forms the transmitting side of the encoder and decoder family described by NXP. The principal features are nine independently encoded lines, three valid logic states per line, support for trinary encoding, and duplicate-word transmission. The active-low transmit-enable input provides a defined event for starting a serial sequence. Because an open state is distinct from low and high, the device can represent more commands with fewer physical input lines than a conventional binary-only encoder. The encoder converts each input combination into a serial codeword and drives its serial output when transmit enable is asserted. During an encoding sequence, the word is transmitted twice, allowing the receiving decoder to reject many transmission errors and recognize repeated valid data. The NXP datasheet identifies the nine inputs as A1 through A5 and A6/D6 through A9/D9, reflecting the family’s support for paired encoder and decoder functions. Typical uses include television remote controls, audio-system command links, industrial pendant controllers, garage-door and access-control transmitters, and low-cost consumer control panels. The device is particularly useful when a design needs a compact command interface with more valid states than a conventional nine-bit binary input would provide, without requiring a separate microcontroller to serialize every button event. When laying out a transmitter, treat the nine command inputs as digital signal lines and keep their traces away from noisy switching nodes. Confirm the electrical levels of the receiver interface and provide suitable pull components for open-state operation. Firmware or hardware should also distinguish a valid repeated word from an incomplete or corrupted transmission before acting on a remote command. This product page combines the NXP manufacturer datasheet, distributor identification, package information, and technical search results with practical guidance for PCB implementation, system pairing, sourcing, and design verification. It also distinguishes the MC145026 encoder from its decoder counterpart and records the absence of a manufacturer-supported pin-compatible substitute.

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MC145028P - 9-Line CMOS Remote Control Decoder | NXP
MC145028P

MC145028P - 9-Line CMOS Remote Control Decoder | NXP

NXP MC145028P is a CMOS remote-control decoder IC designed for the decoding half of an encoder/decoder pair, with nine address lines, a 16-pin through-hole DIP package, and a 0.300-inch, 7.62 mm body width. It receives a serially encoded command stream, checks the transmitted address, and presents the decoded data and valid-data indication to the associated system controller. A remote-control decoder is a logic IC that translates a serial communication stream into usable control signals. The MC145026, MC145027, and MC145028 devices form encoder/decoder families for remote-control applications. In such a hierarchy, an encoder converts parallel command information into a serial waveform, while a decoder receives that waveform, validates the address information, and reconstructs the data. The MC145028P is therefore a semiconductor interface and logic device rather than a general-purpose microcontroller or analog receiver. The MC145028P supports nine encoded information lines, as described for the MC145026/27/28 encoder-and-decoder family. Its CMOS construction supports low-power remote-control system implementations, while the 16-pin DIP package facilitates through-hole assembly, prototyping, repair, and legacy industrial equipment. The identified package is a 0.300-inch, 7.62 mm 16-DIP configuration. Operating details beyond the package and basic device function require confirmation from the manufacturer datasheet. The decoder is intended to work with a compatible remote-control transmitter, commonly an MC145026 encoder. The transmitter serializes address and command information when its transmit-enable signal is asserted. The receiver reconstructs the transmitted information and indicates whether the received command corresponds to the selected address. This arrangement allows one receiver system to respond selectively to one transmitter or group of transmitters. Typical uses include industrial remote-control panels, access and equipment-control systems, telemetry links, model or process-control interfaces, and legacy embedded systems. The 16-DIP format is especially useful where a through-hole replacement is required, but board area and manual insertion limitations make the device less suitable for compact new portable products. When designing around the MC145028P, match the encoder waveform, address coding, timing, and interface voltage levels rather than selecting the receiver from package appearance alone. Confirm the complete pin assignment and electrical limits in the manufacturer datasheet before routing a new PCB. This page combines device identity, package information, sourcing guidance, application fit, and design cautions for engineers evaluating legacy or repair applications.

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MC145406F - 3-Driver/3-Receiver RS-232 Interface IC | Motorola
MC145406F

MC145406F - 3-Driver/3-Receiver RS-232 Interface IC | Motorola

The Motorola MC145406F is a silicon-gate CMOS interface IC combining three drivers and three receivers in a 16-pin DIP package. It is designed for EIA-232-D, EIA-232-E, and CCITT V.28 serial-interface requirements, with TTL-compatible driver inputs, slew-rate-limited outputs, and receivers capable of handling signals up to plus or minus 25 V. The device is intended for RS-232 equipment where one logic-side port must connect to multiple RS-232 line-side channels. An RS-232 interface IC, also called a driver/receiver or transceiver, converts between low-voltage digital logic levels and the voltage levels used by RS-232 links. The MC145406F integrates three transmit channels and three receive channels in one package, reducing component count and simplifying termination around multi-channel communications equipment. Its receiver inputs tolerate negative and positive voltage excursions, while the drivers provide controlled transitions suitable for cable-connected systems. Key features include true TTL input compatibility, slew-rate-limited driver outputs, a 300 ohm power-off source impedance, and output switching typically to within 25 percent of the supply rails. The silicon-gate CMOS implementation combines low-power operation with the voltage-level translation required by legacy serial communications equipment. The receiver input impedance is specified at 3 to 7 kOhm, allowing multiple line-side inputs to be connected to the receiver circuitry. The MC145406F is commonly used in RS-232 communications, industrial control equipment, data acquisition systems, printers, terminals, and legacy peripheral interfaces. Its three-driver arrangement can support transmit, handshake, and control channels when the system requires more than one RS-232 output. The three receivers can independently monitor data, status, and handshake lines. The device is especially useful when a design needs a conventional RS-232 interface rather than a modern low-voltage differential standard such as RS-485 or LVDS. When designing around the MC145406F, account for the voltage polarity of RS-232 signals and include the required external protection, biasing, and connector circuitry recommended by the manufacturer datasheet. Place bypass capacitors close to the supply pins and keep line-side routing away from sensitive logic traces. Confirm that every driver and receiver channel has the correct logic polarity before finalizing the system interface, since the MC145406F is not a protocol controller or level-shifting regulator. This product page provides the MC145406F datasheet reference, interface architecture, package information, application guidance, and engineering considerations for integrating a three-channel EIA-232-D and CCITT V.28 driver/receiver into communications equipment. It also distinguishes the electrical role of the IC from the surrounding connector, protection, and system-level serial protocol requirements.

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MC14541BD - 3MHz Programmable Timer | onsemi | Clock IC
MC14541BD

MC14541BD - 3MHz Programmable Timer | onsemi | Clock IC

The onsemi MC14541BD is a programmable timer IC with a maximum oscillator frequency of 3 MHz, a 16-stage binary counter, and an integrated oscillator in a 14-pin SOIC package. It is designed for applications that require an external resistor-capacitor timing network, automatic initialization at power-on, and programmable timer output control. A programmable timer is a clock-and-timing semiconductor that counts oscillator cycles and derives a delayed or periodic output. Within the broader device hierarchy, the MC14541BD belongs to the timer-counter category, combining a frequency-stable timing element with digital counter and output-control logic. This makes it useful when a circuit needs a basic time interval or recurring output generated locally from a small number of external timing components. The MC14541BD contains three primary functional blocks. Its integrated oscillator operates with an external capacitor and two resistors, while its 16-stage binary counter provides the counting structure used to create timing intervals. An automatic power-on reset circuit initializes the counter when power is applied, reducing the need for external reset sequencing in straightforward timing designs. Output control logic governs the behavior of the timer output. The 3 MHz maximum oscillator frequency establishes the upper operating point for the internal oscillator. Actual operating frequency depends on the selected external resistor-capacitor network, component tolerances, temperature, supply conditions, and the electrical characteristics of the timing network. Designers should select timing components against the manufacturer datasheet limits and verify frequency tolerance across the intended temperature range rather than assuming a perfectly constant period. Typical uses include general-purpose delay generation, periodic pulse generation, industrial control timing, oscillator-based clocking, and embedded timing subcircuits. The device can also serve as a building block in test fixtures and small control systems where an autonomous timer is more convenient than relying on a host microcontroller. The 14-pin SOIC package supports conventional surface-mount assembly and is also available in legacy through-hole-oriented component ecosystems. The principal design consideration is the oscillator network. Place the external resistor and capacitor close to their associated pins, use low-tolerance parts when timing accuracy matters, and reserve adequate ground-return paths to minimize coupling into the counter and output circuitry. Because power-on reset starts the timing sequence automatically, software or external logic should treat the first output transition as an initialization event rather than an arbitrary control signal. This product page consolidates the verified device identity, oscillator and counter features, package information, sourcing options, and drop-in replacement guidance. It also adds practical selection criteria and design notes for engineers evaluating the MC14541BD against other 14-pin programmable timer implementations.

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MC14541BF - 3MHz Programmable Timer IC | onsemi | Timing
MC14541BF

MC14541BF - 3MHz Programmable Timer IC | onsemi | Timing

onsemi MC14541BF is a 3 MHz programmable timer integrated circuit with a 16-stage binary counter, integrated oscillator, automatic power-on reset, and output control logic in a 14-pin SOIC package. The MC14541BF generates a periodic output after a programmed count interval, making it suitable for timer, delay, waveform-generation, and periodic-control circuits. A programmable timer is a clock-and-timing semiconductor that counts oscillator or external clock pulses and changes an output after a selected number of counts. The MC14541BF combines that counting function with an on-chip oscillator, allowing an external resistor-capacitor network to establish the timing reference. This integration reduces the number of external timing components needed for basic interval-generation and periodic-event circuits. The device's principal features include a 16-stage binary counter, a maximum stated operating frequency of 3 MHz, automatic power-on reset, and dedicated output control logic. Its 14-pin SOIC package supports surface-mount PCB construction and automated assembly. The integrated oscillator accepts an external timing capacitor and two resistors, while the counter determines the interval between output transitions. The MC14541BF is a fixed-function timing device rather than a microcontroller or general-purpose clock generator. Its architecture is appropriate when a circuit needs predictable interval generation, recurring output transitions, or a delayed output event. The 16-stage counter provides a defined maximum count range for calculating the timing period from the oscillator frequency and selected count value. Typical uses include industrial control and automation timing, instrumentation and test-equipment trigger generation, consumer appliance delay circuits, oscillator and pulse-generation modules, and educational digital-electronics systems. The external resistor-capacitor timing network makes the frequency adjustable, while automatic power-on reset establishes a defined starting state after power is applied. PCB implementation requires close attention to oscillator component placement and signal routing. Place the external timing capacitor and resistors near the oscillator pins, keep the timing node compact, and avoid routing high-current or high-voltage switching paths beneath or beside that network. Confirm the output polarity and required count configuration against the manufacturer datasheet before relying on the circuit for a safety-related timing function. This product page combines the MC14541BF timing architecture, package information, engineering applications, comparison details, and drop-in replacement guidance. It also highlights the design checks needed to evaluate equivalent CMOS timer ICs without treating general functional similarity as proof of complete pin, timing, and electrical equivalence.

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MC14543BF - 3-18V BCD 7-Segment LCD Driver | onsemi
MC14543BF

MC14543BF - 3-18V BCD 7-Segment LCD Driver | onsemi

The onsemi MC14543BF is a CMOS BCD-to-seven-segment latch, decoder, and driver designed for liquid-crystal readouts, with operation from 3 V to 18 V in a 16-pin SOIC package. It accepts 4-bit BCD input and uses the 8421 code format to control the seven segment and decimal-point outputs required by common LCD display readouts. The MC14543BF combines input storage, code decoding, and display drive functions in one integrated circuit. An LCD BCD-to-seven-segment decoder is a display-interface IC positioned between a digital control system and a segmented liquid-crystal display. In the signal hierarchy, it belongs to the decoder and display-driver class within integrated logic and interface circuits. Its internal latch captures the input code, allowing the connected logic to update a display value without unintended intermediate segment transitions during the storage interval. The MC14543BF operates across a 3 V to 18 V supply range, allowing it to interface with both low-voltage and higher-voltage CMOS systems when its output drive requirements match the selected display. Its CMOS construction supports low-power operation in battery-powered equipment, while the integrated latch and 8421 BCD decoder reduce the number of external components required for a basic numeric display. The 16-pin SOIC package supports conventional surface-mount assembly. Because liquid-crystal segments generally require an alternating drive rather than a static DC level, the MC14543BF is intended for displays with compatible drive characteristics. Its segment outputs should be connected in accordance with the manufacturer pin-description table and the display module's required common and segment arrangement. Designers should verify output timing, polarity, and segment mapping against the selected LCD rather than inferring them only from the segment labels. Typical uses include compact digital meters, panel counters, small industrial readouts, laboratory equipment, and embedded control panels that receive BCD values from a microcontroller, counter, or system controller. It is especially appropriate where a dedicated numeric display is needed and the source already supplies a stable 4-bit BCD word. The latch function can simplify display updates and reduce intermediate visual states. Design the PCB with a low-impedance ground return and route the BCD inputs away from sensitive analog or high-speed switching nodes. Confirm the LCD segment mapping, common-drive topology, logic levels, and supply decoupling on the schematic before fabrication. If the display requires LCD bias generation, backlight control, or multiple digits, those functions generally need additional circuitry. This page combines the verified MC14543BF operating limits, package information, function description, sourcing workflow, and design guidance. It also distinguishes a true pin-to-pin replacement from merely similar seven-segment decoder functions by requiring identical package construction and confirmed electrical and pin compatibility.

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MC145505P - 13-Bit Mono PCM Codec-Filter | Motorola
MC145505P

MC145505P - 13-Bit Mono PCM Codec-Filter | Motorola

The Motorola MC145505P is a 13-bit PCM codec-filter mono-circuit in a 16-pin PDIP package, designed for one-channel A-law or mu-law pulse-code-modulation audio interfaces. Its principal characteristics are single-channel operation, 13-bit PCM resolution, an integrated codec-filter function, and an operating-temperature range of -40°C to +85°C. A PCM codec-filter is an interface IC that converts between analog voice-band audio and digital PCM streams. The MC145505 family combines a codec and filter in one circuit, reducing the component count required by a traditional telecommunications or audio interface. It belongs to the broader hierarchy of audio codec, interface IC, ADC/DAC, and signal-processing semiconductor families. The MC145505P is identified as a mono PCM codec-filter supporting A-law and mu-law coding. The 13-bit PCM format is suitable for speech-oriented systems requiring one digital voice channel, while the integrated filter function helps condition the analog audio path. The device is supplied in a through-hole PDIP package, making it suitable for legacy telecommunications equipment, voice-processing systems, and industrial control products assembled with conventional through-hole methods. Technically, the MC145505P belongs to the legacy MC145502, MC145503, and MC145505 family of per-channel PCM codec-filter mono-circuits. The model suffix “P” identifies the PDIP package option shown in the product listings. Because this is a mature legacy interface device, system-level verification should emphasize clocking, analog signal levels, timing, and PCB compatibility rather than assuming that every newer codec has the same analog interface or control arrangement. Typical applications include single-channel digital telephony, pulse-code-modulation voice terminals, audio recording and playback modules, speech-capture equipment, and industrial voice panels. In these systems, the codec-filter can reduce the number of separate conversion and filtering blocks while preserving compatibility with A-law or mu-law PCM channels. Before replacing an existing design, compare the complete pin description, supply requirements, clock interface, and analog signal path in the manufacturer datasheet. The MC145505P cannot be treated as a generic modern audio ADC or DAC substitute because its PCM framing, companding format, timing, and legacy control interface are application-specific. This product record combines the manufacturer-family description, package and temperature information, lifecycle classification, source links, and design-focused guidance. It also clearly distinguishes verified device characteristics from parameters that require confirmation in the original design documentation.

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MC145506P 22-DIP PCM Codec-Filter Mono-Circuit | Motorola
MC145506P

MC145506P 22-DIP PCM Codec-Filter Mono-Circuit | Motorola

Motorola MC145506P is a mono PCM codec-filter integrated circuit designed for voice digitization, reconstruction, band limiting, and signal smoothing in PCM communication systems. The device provides a 13-bit PCM interface and is packaged in a 22-pin DIP. Its integrated codec-filter architecture reduces the number of separate discrete functions required around a voice-processing signal chain. A PCM codec-filter is a specialized interface IC that belongs to the broader class of audio codecs and PCM interface devices. In a telephone or telecommunications system, a PCM interface converts between analog voice signals and digital pulse-code-modulated streams. Codec-filter circuits also perform the band-limiting and smoothing needed to prepare signals for transmission or reconstruction at the receiving end. The MC145506 family combines voice digitization and reconstruction with integrated filtering functions. According to the manufacturer datasheet, the MC145506, MC145507, and MC145508 are per-channel codec-filter PCM mono-circuits. This family positioning makes the MC145506P useful in designs that require a dedicated mono PCM channel rather than a multichannel audio codec with a substantially different control and data interface. The MC145506P exposes a 13-bit PCM data path, making bit allocation an important system-level consideration. Designers should determine whether the host channel expects 13-bit linear PCM, determine the required clock and framing arrangement from the datasheet, and account for any sign-extension or scaling performed elsewhere in the system. These interface details are more important than simply matching a generic codec description because incompatible framing or timing can prevent correct operation despite similar audio functionality. Typical applications include mono voice transmit and receive paths in telecommunications equipment, digital telephone interfaces, speech-processing systems, and PCM-based audio links. In each case, the device can combine conversion and filtering functions while reducing the number of external signal-conditioning blocks. Its mono-circuit architecture is particularly appropriate when each conversation channel is handled independently. The primary design consideration is PCB footprint compatibility. The MC145506P uses a 22-pin DIP rather than a modern surface-mount package, so it requires through-hole routing and is generally less compact than newer PCM codec implementations. Confirm pin assignments, supply requirements, clocking, analog interfaces, and timing values against the manufacturer datasheet before laying out a new board or adapting an existing design. This product record combines the manufacturer datasheet identity, distributor catalog details, package information, application guidance, and an explicit comparison of what is known about this legacy PCM interface with what requires circuit-level verification. It is intended to help engineers identify the correct function, package, and application before requesting sourcing information for an assembled board.

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MC14551BD - 4PDT Analog Switch, 3-18 V, 16-SOIC | onsemi
MC14551BD

MC14551BD - 4PDT Analog Switch, 3-18 V, 16-SOIC | onsemi

onsemi MC14551BD is a digitally controlled 4PDT analog switch with a 3 V to 18 V supply range, low ON impedance, and very low OFF leakage current, housed in a 16-SOIC package. The device provides four independently addressed analog switch sections for routing signals within the complete supply voltage range. An analog switch is a solid-state semiconductor device that routes analog or digital signals under digital control without mechanical contacts. The MC14551BD belongs to the analog switch and multiplexer hierarchy, where a 4PDT arrangement provides four independent pole paths. This makes it useful for signal routing, channel selection, test-point isolation, and analog signal multiplexing. The main device characteristics include a 3 V to 18 V power-supply range, low ON impedance, and very low OFF leakage current. The 16-SOIC package supports conventional surface-mount PCB assembly. The control inputs determine which signal paths are connected, while the switched terminals can handle analog signals across the operating supply range. The MC14551B architecture is based on complementary switch elements controlled by logic-level select inputs. Low ON resistance helps minimize signal attenuation when a channel is active, while low OFF leakage helps prevent unwanted coupling between inactive channels. The device is suitable for systems requiring several analog paths to share a common interface without using mechanical relays. Typical uses include multiplexed sensor acquisition, audio and communications routing, instrumentation signal selection, and embedded test circuits. In a measurement system, the switch can connect multiple inputs to a shared amplifier or converter, reducing the number of external analog front-end components. In a communications design, it can route controlled signals among test and operating paths. For layout, place the device close to the signal sources and receiving circuitry to minimize trace resistance and capacitance. Keep control traces away from sensitive analog nodes where possible, and follow the datasheet pin-description table when assigning the 16-SOIC footprint. This page summarizes the principal device function, package information, sourcing structure, and practical design considerations for engineers evaluating the MC14551BD.

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MC14551BF - 280 Ohm Quad 2:1 Analog Switch | onsemi
MC14551BF

MC14551BF - 280 Ohm Quad 2:1 Analog Switch | onsemi

The onsemi MC14551BF is a digitally controlled quad 2:1 analog multiplexer and demultiplexer with a typical 280 ohm ON resistance, four independent 2:1 switching channels, and a 16-pin SOIC package. It routes analog signals across the complete supply-voltage range and provides very low OFF leakage current, making it suitable for precision signal-selection and test systems. An analog multiplexer is a semiconductor interface that uses digital control signals to select one of multiple analog inputs and connect it to a shared output. A multiplexer and demultiplexer can also reverse this function, allowing a common line to be routed to a selected destination. The MC14551BF belongs to the analog switch and multiplexer hierarchy within interface ICs and provides multiple switching functions in one package. Key features include a 2:1 configuration for each of four circuits, a 280 ohm ON resistance, low OFF leakage, and control inputs protected by triple diode protection. The device supports a 3.0 Vdc to 18 Vdc supply range, while its analog signal range extends across the VDD-to-VEE span. These characteristics support both positive-supply and dual-supply signal-routing arrangements when the circuit is operated within its specified limits. The MC14551BF uses independent address and enable controls to determine which paired input reaches each multiplexer output. This arrangement allows a microcontroller or programmable logic device to scan sensors, sample multiple measurement channels, isolate instrumentation paths, or route signals to converters. Its four switching sections are organized as a 4PDT solid-state switch, providing a compact way to implement several analog routing functions on one board. Typical uses include data acquisition systems, automated test equipment, programmable signal conditioning, industrial control interfaces, and multichannel sensor acquisition. The 280 ohm ON resistance is most appropriate for moderate-impedance analog paths where switching loss and input loading remain acceptable. For very high-impedance sources, the selected switch's capacitance, leakage, and settling behavior require validation in the complete signal chain. Design the PCB with short analog traces, a solid ground reference, and decoupling placed close to VDD and VEE. Account for injected charge and off-state leakage when switching between sources at different potentials. Avoid exceeding the device's maximum rated voltages, and verify control logic levels across the full supply range before using the multiplexer's address and enable inputs. This product page consolidates the exact MC14551BF identification, package details, technical specifications, sourcing information, selection guidance, and design considerations into one engineering reference. It also distinguishes confirmed drop-in-family options from unrelated interface ICs, helping PCB designers evaluate footprint reuse without confusing electrical equivalence with functional similarity.

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MC145554P - 13-Bit PCM Codec-Filter | Motorola | Voice
MC145554P

MC145554P - 13-Bit PCM Codec-Filter | Motorola | Voice

The Motorola MC145554P is a 13-bit PCM codec-filter integrated circuit housed in a 16-pin plastic dual inline package. It combines PCM voice digitization and reconstruction with the band-limiting and smoothing functions required by PCM communication systems. Its principal function is to convert analog voice signals into digital PCM data and reconstruct analog audio from received PCM data. A PCM codec-filter belongs to the audio codec and interface hierarchy, where it bridges linear analog audio and digital PCM telecommunications. The codec-filter concept combines signal conversion with frequency-domain filtering in one interface circuit. In a voice system, this integration can reduce the number of separate external filtering stages required around a codec while supporting the bandwidth and smoothing requirements associated with voice transmission. The MC145554 family is designed for per-channel PCM signal processing. The MC145554P identifies the 16-pin plastic DIP configuration, while the 13-bit PCM interface resolution is listed for the exact MC145554P orderable device. Its primary engineering benefit is functional consolidation: analog-to-digital conversion, digital-to-analog reconstruction, band limiting, and smoothing are combined within a single voice-channel interface. The codec-filter family operates with synchronous and asynchronous PCM systems. That flexibility makes the device relevant to telecommunications, voice processing, digital telephony, and embedded audio interfaces where the system clock arrangement differs between endpoints. Designers must still verify clocking, impedance, timing, and analog-interface requirements against the manufacturer datasheet before laying out a new circuit. Typical applications include PCM voice terminals, digital telephone interfaces, speech-processing equipment, voice-band recorders, and telecommunications line-card signal paths. In these systems, the MC145554P provides the conversion boundary between an analog microphone or speaker path and a digital PCM processor. It is especially relevant when a compact single-channel implementation is preferable to separate codec and filter circuitry. A key design consideration is that this is a legacy 16-pin DIP device rather than a modern mixed-signal package. PCB space, assembly method, analog grounding, clock cleanliness, and connector-level signal integrity therefore deserve attention. Reproduction of an existing design should preserve the original footprint, pin functions, timing assumptions, and external component values unless a validated cross-reference has been completed. This product page consolidates the confirmed device identity, PCM interface information, package details, sourcing path, and design considerations into one engineering reference. It also distinguishes documented drop-in replacements from merely similar legacy codec-filter devices, helping engineers determine when PCB reuse is defensible and when a fresh design should use a newer codec architecture.

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MC145557P - 13-Bit A-Law PCM Codec-Filter | Motorola
MC145557P

MC145557P - 13-Bit A-Law PCM Codec-Filter | Motorola

Motorola, Inc. MC145557P is a single-function A-law PCM codec-filter integrated circuit with 13-bit PCM resolution, offered in a 16-lead PDIP package. It belongs to the MC145554, MC145557, MC145564, and MC145567 family of per-channel devices that combine voice digitization and reconstruction with band-limiting and smoothing functions for PCM communication systems. The component is designed for use in synchronous and asynchronous PCM signal paths. A PCM codec-filter is an interface integrated circuit that processes pulse-code-modulated audio or voice signals between an analog system and a digital PCM channel. Within the broader semiconductor hierarchy, it is a codec and signal-conditioning device within interface ICs, with a more specialized function than a general-purpose audio codec. The MC145557P specifically combines 13-bit PCM processing with A-law encoding in a single 16-lead PDIP package. The principal identified specifications are 13-bit PCM resolution, A-law operation, one codec-filter function, and a 16-pin PDIP package. Its single-function organization makes it suitable for designs that require dedicated per-channel voice conversion rather than a multi-channel codec with additional control and routing functions. The through-hole PDIP format also supports conventional PCB assembly, prototyping, repair, and communication equipment with larger component packages. In a PCM system, the codec-filter provides the conversion and filtering functions needed to digitize voice information, reconstruct received PCM information, and limit the signal band before transmission or processing. Devices in the MC145554, MC145557, MC145564, and MC145567 family perform these per-channel functions and can operate in synchronous or asynchronous systems. The MC145557P is differentiated within that family by its A-law configuration and 13-bit PCM resolution. Typical implementation areas include telephony and voice communication equipment, PCM interface modules, digital voice processing systems, telecommunications line interfaces, and legacy PCM test equipment. Its 16-lead PDIP package may be especially useful where a through-hole footprint is preferred over a surface-mount package, or where the original circuit design already uses this package style. Circuit implementation should follow the Motorola manufacturer datasheet for pin assignment, external component selection, clocking, and signal-path layout. Verify the required A-law system configuration, 13-bit PCM word format, synchronous or asynchronous timing mode, and grounding arrangement before finalizing the PCB. The PDIP footprint also requires adequate lead spacing and clearance from adjacent components. This product overview consolidates the confirmed codec type, PCM resolution, A-law configuration, package format, sourcing context, and functional relationships into an engineering-focused reference. It also provides application guidance, design cautions, package information, and links to the manufacturer documentation needed for an informed design decision.

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MC14555BF - Dual 1-of-4 CMOS Decoder | onsemi
MC14555BF

MC14555BF - Dual 1-of-4 CMOS Decoder | onsemi

The onsemi MC14555BF is a dual binary-to-1-of-4 decoder/demultiplexer built with complementary MOS enhancement-mode devices, packaged in a 16-pin SOIC. Each decoder section has two select inputs, A and B, an active-low enable input, E, and four mutually exclusive outputs, Q0 through Q3. The selected output switches high while the other three outputs remain low. A nominal 5 V supply and 440 ns propagation delay at a 50 pF load are identified for the device. A decoder or demultiplexer is a combinational logic device that converts a binary selection code into one active output path. The dual architecture provides two independent binary-to-1-of-4 conversion channels in one IC. This hierarchy places the MC14555BF in the CMOS logic family, specifically within decoder and demultiplexer logic ICs used to route control, address, or selection signals. The principal feature is active-high decoding: the selected output goes to the high state, while the three unselected outputs remain low. Two select inputs permit all four output positions to be addressed. An active-low enable input provides a common control function for disabling the decoding network. The complementary MOS construction supports low-power operation and compatibility with conventional CMOS logic systems. The MC14555BF combines two complete decoder/demultiplexer functions in one package, reducing component count in designs that require parallel four-way selection. Its 440 ns propagation delay at a 50 pF load provides useful timing guidance for control paths where propagation delay must remain predictable. The 16-pin SOIC package also supports conventional surface-mount assembly and inspection. Typical uses include four-way control-signal routing, address selection, display or peripheral selection, instrumentation multiplexing, and industrial control logic. Because the device is CMOS and operates from a nominal 5 V supply, it is particularly appropriate for systems using 5 V digital logic levels. The enable input can also support shared bus isolation or synchronized selection in a larger controller. Design with the active-low enable polarity and active-high output polarity clearly in mind. Confirm the voltage ratings, absolute maximum conditions, output drive capability, and timing limits in the onsemi datasheet before finalizing a new design. Place the device so that switching outputs do not unintentionally drive adjacent high-impedance nodes, and validate fanout against every connected load. This product page combines the manufacturer function description, package information, timing indications, application guidance, structured specifications, and engineering design notes to accelerate component evaluation. Request current commercial availability and sourcing terms through the Request a Quote form on this page.

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MC14556BD - 1-of-4 CMOS Decoder/Demultiplexer | Motorola
MC14556BD

MC14556BD - 1-of-4 CMOS Decoder/Demultiplexer | Motorola

The Motorola MC14556BD is a dual binary to 1-of-4 decoder/demultiplexer built with complementary MOS enhancement-mode devices. It accepts two select inputs, A and B, together with an active-low enable input, E, and routes one of four mutually exclusive outputs, Q0 through Q3, according to the select state. The device operates from 3 V to 18 V, supports operation from -55 °C to 125 °C, and is packaged in a 16-pin SOIC. A decoder/demultiplexer is a logic device that converts binary selection information into one active output path. This makes the MC14556BD useful for control, address decoding, peripheral selection, data routing, and test-point multiplexing. Its four outputs are designed so that only one selected output is active for a valid select combination while the enable input provides an additional gating function. The complementary MOS construction places the device in the 4000-series CMOS logic family. The principal electrical characteristics are a 3 V to 18 V supply range, low-power CMOS operation, and an active-low enable control. The package is a 16-SOIC, also described in listings as SOIC-16 or PDSO16, with a body width of 3.90 mm and a nominal 0.154 inch lead pitch. The operating-temperature range of -55 °C to 125 °C supports industrial and extended-temperature equipment where the additional qualification and sourcing requirements are satisfied. The MC14556BD can decode a two-bit command into one of four mutually exclusive destinations, making it appropriate for selecting one sensor, switching one bank of loads, directing a signal path, or controlling a group of digital peripherals. Because it is a demultiplexer, the enable input can inhibit output activity during reset, initialization, or shared-bus conditions. Designers should account for propagation delay and output transition timing when operating at high system clock rates. For reliable PCB implementation, place the device close to the signals it decodes, route the enable and select nets away from noisy switching nodes, and maintain a common ground reference between the logic device and connected circuitry. Use the manufacturer pin-description and logic diagrams when assigning PCB tracks because the available product documentation does not reproduce a verified pin-by-pin connection table here. This product page combines the device’s verified function, supply range, package, temperature range, and sourcing information with application guidance, comparison parameters, and practical design notes. The result helps engineers identify whether the MC14556BD fits a new decoder/demultiplexer design or whether a different logic function is required.

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MC14556BF Dual 1-of-4 Decoder/Demultiplexer | onsemi
MC14556BF

MC14556BF Dual 1-of-4 Decoder/Demultiplexer | onsemi

The onsemi MC14556BF is a dual binary-to-1-of-4 decoder/demultiplexer built with complementary MOS enhancement-mode devices, supplied in a 16-pin gull-wing surface-mount package. Each decoder section accepts two select inputs, A and B, and uses the four binary combinations to address four mutually exclusive outputs. A shared active-low Enable input controls whether the selected output path is active, making the device useful for address decoding, data routing, chip selection, and control-signal multiplexing. A decoder/demultiplexer is a digital logic IC that translates a binary address into one active output. It belongs to the decoder hierarchy within combinational logic, interface ICs, and broader semiconductor products. In demultiplexer mode, the MC14556BF routes one selected output according to the A and B inputs. The active-low Enable input provides a common gating function, allowing the selected path to be disabled without changing the select state. The verified device information identifies complementary MOS enhancement-mode construction, two select inputs, one active-low Enable input, and four mutually exclusive outputs labeled Q2 and Q3 within the family description. Its specified temperature grade is military, and the package is described as a rectangular gull-wing SOP with 16 terminals. These characteristics place it in applications that require compact binary decoding alongside conventional through-hole-era logic-package compatibility. Typical uses include selecting one of four peripheral sections, decoding a two-bit control address, separating mutually exclusive commands, and directing a shared signal toward one of four destinations. Because the outputs are mutually exclusive, the active output provides a straightforward way to convert a two-bit binary value into a one-of-four selection without implementing individual Boolean gates at the system level. When laying out a board, place the device near the signals it decodes and route each output according to its assigned destination. Maintain a common ground reference with the controlling logic and connected circuits. Treat all unused inputs according to the manufacturer logic truth table, and do not infer active levels or output polarity from the output names alone. Review the pin-description and truth-table sections in the manufacturer datasheet before finalizing PCB nets. This page consolidates the device identity, package information, decoder architecture, sourcing workflow, comparison framework, and practical design considerations. It also distinguishes documented facts from parameters that require direct confirmation from the manufacturer datasheet, helping engineers plan a review of the MC14556BF without relying on incomplete distributor summaries.

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MC145572FN - ISDN U-Interface Transceiver 44-PLCC | NXP
MC145572FN

MC145572FN - ISDN U-Interface Transceiver 44-PLCC | NXP

The NXP (formerly Motorola/Freescale) MC145572FN is a single-chip ISDN U-interface transceiver housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package. It implements the 2B1Q four-level line code defined by ANSI T1.601 for full-duplex digital transmission on a 2-wire metallic loop, supporting basic-rate access on the U reference point between the network termination (NT1) and the line card (LT). The device integrates echo cancellation, adaptive equalization, and a 2B+D (144 kbps) data channel into one CMOS IC originally developed by Motorola Semiconductor. An ISDN U-interface transceiver is the analog front-end IC that bridges digital ISDN terminal equipment with the 2-wire subscriber line. Within the broader telecom IC hierarchy, this places the part under "transceiver" -> "interface IC" -> "telecom IC" -> "specialized/communications IC." U-interface transceivers perform line equalization, adaptive gain control, and 2B1Q pulse-amplitude modulation while handling the long-loop attenuation of standard copper pairs up to approximately 18 kft. Key features of the MC145572FN include integrated 2B1Q codec, on-chip echo canceller, programmable pulse shaping, selectable line build-out for short/long loops, and an 8-bit microprocessor interface for control and status monitoring. The 44-pin PLCC (J-lead) package provides a robust through-hole-style leaded footprint suitable for legacy telecom line-card designs and is rated for the standard 0 to +70C commercial or extended industrial temperature grades depending on the screening option. Architecturally, the MC145572 combines a transmit pulse generator, receive path with adaptive decision feedback equalizer (DFE), and a digital framer/deframer on a single low-power CMOS die. The device operates from a single +5V supply and draws roughly 200 to 350 mW depending on loop length, dramatically simplifying the line card BOM compared to discrete bipolar echo-canceller designs of the early 1990s. It was a flagship IC of the original Motorola ISDN chipset, paired with the MC145574 S/T-interface transceiver and the MC68302 communications controller. Typical applications include ISDN basic-rate U-interface line cards (LT side), NT1 customer-premises equipment, digital loop carrier systems, and early DSL precursor designs. Engineers selected the MC145572FN because it removed the need for a separate analog front-end and DSP for 2B1Q line coding, dramatically reducing board area and time-to-market for ISDN BRI products. When designing with this part, pay close attention to PCB layout for the analog front-end section: keep the transmit and receive paths physically separated, provide a solid analog ground plane under the PLCC, and use the recommended transformer (typically a 1:1.36 or 1:2 turns ratio Pulse PE-68023 or equivalent) for isolation. Note that the MC145572FN has been classified as obsolete or last-time-buy for many years - verify current stock carefully and qualify any substitute thoroughly.

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MC145572FNR2 - ISDN U-Interface Transceiver, 44-PLCC | NXP
MC145572FNR2

MC145572FNR2 - ISDN U-Interface Transceiver, 44-PLCC | NXP

The NXP (formerly Freescale/Motorola) MC145572FNR2 is an ISDN U-interface transceiver IC housed in a 44-pin PLCC (16.59 x 16.59 mm) J-leaded surface-mount package. It integrates the analog front-end and digital echo-cancellation functions required for full-duplex 2B1Q transmission over a 2-wire ISDN U-interface loop, and is designed to operate as a companion to the MC145574 S/T-interface transceiver in customer-premises equipment (CPE) or network-terminal designs. The device supports 4-wire full-duplex data flow at the standard ISDN Basic Rate Access (BRA) line rate of 160 kbps over twisted-pair copper loops up to approximately 5-6 km. An ISDN U-interface transceiver is a specialized line-interface IC that bridges digital terminal equipment and the 2-wire metallic local loop of the public switched telephone network. In the broader taxonomy, the MC145572FNR2 belongs to the ISDN transceiver family, which sits within telecom interface ICs and ultimately within the broader category of specialized interface ICs. The U-interface (defined in ANSI T1.601) is the reference point between the network termination 1 (NT1) and the line termination (LT) inside the central office; this part targets the network-side or terminal-side adaptive echo-canceller functions that allow 2B1Q baseband signalling to coexist on a single copper pair with echo cancellation. Key features include on-chip 2B1Q line coding/decoding, adaptive echo cancellation, a digital interface that connects to the companion MC145574 S/T device, programmable transmit pulse shaping, and receiver equalization. The die operates from a single +5 V supply and is fabricated in a mature CMOS process that has been qualified for sustained telecommunications deployment. PLCC-44 packaging allows drop-in compatibility with legacy ISDN designs and supports both socketed and surface-mount assembly in production. Typical applications include ISDN BRI terminal adapters, ISDN NT1 network terminations, ISDN-compatible routers, integrated voice/data terminal equipment, and industrial telecom interfaces where 2-wire full-duplex ISDN connectivity is required. Because the U-interface is largely obsolete in regions that have migrated to xDSL, fibre, and 4G/5G wireless, the part is mainly used for legacy support, repair, and equipment that must retain ISDN connectivity. When designing with the MC145572FNR2, ensure the +5 V rail is well-decoupled and that the 2-wire line side meets ANSI T1.601 longitudinal-balance and pulse-mask requirements. Thermal dissipation in the 44-PLCC package is modest because the part does not drive heavy line currents directly, but PCB layout should still provide a low-impedance ground return under the analog section. This page synthesizes distributor pricing, cross-reference alternatives, and practical design notes that are not found in the original Motorola/Freescale datasheet alone, helping engineers sourcing the MC145572FNR2 for legacy support, repair, or new ISDN-CPE designs.

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MC145572PB - ISDN U-Interface Transceiver, 44-LQFP | NXP
MC145572PB

MC145572PB - ISDN U-Interface Transceiver, 44-LQFP | NXP

The NXP MC145572PB is an ISDN U-interface transceiver housed in a 44-pin LQFP (10x10 mm) package, originally designed by Motorola and later transferred through Freescale to NXP. It is a specialized interface IC operating at 5V with an industrial temperature range of -30C to +85C, supporting data rates of up to 160 kbps for 2B1Q ISDN basic-rate-access (BRA) U-interface applications. An ISDN U-interface transceiver is a type of specialized interface IC that handles the physical-layer signaling between customer-premises equipment (CPE) and the central-office line card over a 2-wire full-duplex digital subscriber loop. Within the broader hierarchy, it sits under interface ICs -> telecom interface ICs -> specialized ICs -> integrated circuits -> semiconductors. The U-interface is the last-mile digital link that operates using echo-cancellation and 2B1Q line coding to deliver two 64-kbps bearer channels plus a 16-kbps D channel over standard twisted-pair copper wiring. Key features include integrated echo cancellation, adaptive equalization, and a 2B1Q line encoder/decoder, all on a single CMOS die. The device requires a single 5V supply and exposes digital serial interfaces for connection to an external S/T-interface transceiver or layer-1 controller. Its 44-LQFP (10x10) package offers a 0.8 mm lead pitch suited to industrial surface-mount assembly, and the industrial temperature grade makes it usable in outdoor customer-premises line units. Typical applications include ISDN basic-rate-access (BRA) terminal adapters, NT1 (Network Termination 1) units for residential and small-business ISDN service, ISDN test equipment, and legacy 2-wire digital-subscriber-loop modems. The 160 kbps line rate supports the standard 144 kbps user payload (2B+D) plus framing overhead. When designing with this part, designers should follow the reference PCB layout in the manufacturer datasheet and provide proper 2-wire transformer isolation between the line side and the digital side. Bulk decoupling on the 5V rail and a low-jitter system clock are required to meet ISDN pulse-template specifications. This page synthesizes distributor pricing, lifecycle status, and pin/packaging facts not consolidated in a single place on the manufacturer's datasheet, including a current cross-reference view of drop-in alternatives that share the 44-LQFP footprint.

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