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MAX98090AEWJ+T Ultra-Low-Power Stereo Audio Codec | ADI
The Analog Devices MAX98090AEWJ+T is an ultra-low-power stereo audio codec with a 24-bit I2S interface, six configurable input pins, and integrated audio signal processing, packaged in a 49-WLP measuring 3.15 mm by 3.15 mm. The device combines microphone, line, headphone, and speaker signal-path functions in a compact package for portable audio equipment. According to the manufacturer product page, its high-performance, low-power design and flexible input scheme make it suitable for portable applications. An audio codec is an integrated signal-processing semiconductor that converts between digital audio data and analog microphone, line, or headphone signals. The MAX98090 belongs to the broader codec hierarchy: audio codec → mixed-signal interface IC → digital and analog signal conversion → portable audio electronics. Its integrated architecture can reduce the number of external components needed for a compact audio subsystem while supporting configurable analog and digital microphone inputs. The MAX98090 provides a 24-bit audio interface and an I2S-oriented digital audio connection, while its six input pins can be configured for analog or digital microphones, differential or single-ended line inputs, or full-scale differential inputs. The manufacturer identifies the MAX98090 as an ultra-low-power stereo audio codec designed for portable systems. Its WLP package provides a small physical footprint, but the package requires careful PCB layout, exposed-pad thermal management, and assembly controls. Typical signal paths include digital microphones feeding an I2S-compatible processor, analog microphone or line sources feeding the codec inputs, and headphone or speaker-related audio functions. The flexible input configuration allows one codec family to address portable recording, communication, and multimedia designs. The exact input sensitivity, sample-rate limits, headphone-output capability, and speaker-output current should be confirmed from the manufacturer datasheet for the final application. The main design consideration is ensuring that microphone and line inputs are correctly configured, bypassed, and referenced. I2S clocking, digital microphone power sequencing, analog grounding, and WLP assembly must be validated together rather than treated as independent blocks. Use the manufacturer datasheet and recommended application information for the complete pin mapping, electrical limits, and PCB land pattern. This product page synthesizes verified manufacturer descriptions, distributor availability, package information, pricing references, and practical design guidance. Because the supplied data does not include a complete verified pin table or all electrical limits, missing values are explicitly marked rather than inferred. Engineers should consult the Analog Devices MAX98090 datasheet before finalizing a high-volume or safety-critical portable-audio design.
MAX9926UAEE+ - 4.5-5.5V VR Sensor Interface | Maxim
The Maxim Integrated MAX9926UAEE+ is a 4.5 V to 5.5 V variable-reluctance sensor interface with differential input, adaptive peak-threshold detection, zero-crossing detection, and logic output in a 16-pin QSOP package. It is designed to turn the small, changing voltage produced by automotive magnetic-coil sensors into robust digital pulses for position, speed, crankshaft, camshaft, and transmission-shaft measurement. A variable-reluctance sensor interface, also called a VR sensor interface or magnetic-coil sensor interface, belongs to the sensor-interface IC hierarchy and conditions signals that would otherwise be difficult for a controller to measure directly. The MAX9926 family combines a precision amplifier, comparator, selectable adaptive peak threshold, and zero-crossing circuitry so the system can detect sensor peaks and timing events while reducing sensitivity to signal-shape and operating-condition changes. The verified product information identifies the MAX9926UAEE+ as a variable-reluctance sensor interface with differential input and adaptive peak threshold in a 16-pin QSOP package. The listed operating supply range is 4.5 V to 5.5 V, and distributor material describes a typical 4.7 mA supply current. The differential input structure supports rejection of common-mode disturbance, while the adaptive threshold is intended to preserve detection performance as sensor amplitude and operating conditions vary. The MAX9926UAEE+ is suited to automotive ignition and engine-position systems, transmission and wheel-speed sensing, industrial magnetic pickup sensing, and other applications where a magnetic target moves relative to a coil. Its logic output gives a downstream microcontroller or engine controller a digital event for timing, direction, or position interpretation. The 16-pin QSOP format also supports compact PCB layouts, although pin-level verification is required before layout release. The principal design consideration is preserving the sensor signal path from the coil to the differential inputs. Route the sensor traces as a short, tightly coupled pair, provide appropriate input conditioning and filtering according to the manufacturer datasheet, and maintain a stable ground reference. Avoid long parallel runs or sharp impedance discontinuities that could degrade noise immunity. This product page consolidates the verified manufacturer identity, package, supply information, distributor availability references, and application context. Detailed electrical limits, pin names, threshold timing, temperature ratings, and exact replacement parameters should be confirmed against the current MAX9926 datasheet before production release.
MC14407L - Full-Duplex 8-Bit PCM Codec | Motorola
Motorola MC14407L is a full-duplex 8-bit companded PCM codec designed for telecommunications interface applications. The verified source information identifies A-law and mu-law companding support, a 24-pin CDIP package, and an operating temperature range of -40°C to +85°C. Its principal function is to convert between 8-bit companded PCM voice signals and the parallel digital interface used by a telecommunications system. A PCM codec is a semiconductor interface IC that performs the digital conversion required by pulse-code-modulation communication systems. In the hierarchy of electronic components, a codec belongs to the interface IC and telecom-interface categories, between general-purpose integrated circuits and complete voice-processing subsystems. Companded PCM reduces the number of bits required to represent selected voice-amplitude ranges while retaining a representation suitable for transmission over digital communication links. The MC14407L supports both A-law and mu-law operation, allowing it to match common digital telephony signaling conventions. Its full-duplex architecture supports simultaneous transmit and receive signal paths, making it suitable for channel interfaces, terminal adapters, and telecommunications equipment that exchange PCM data with a line interface or digital switching system. The 24-pin CDIP package also provides a through-hole construction for systems assembled with conventional axial or DIP-compatible processes. Operation across -40°C to +85°C supports industrial-temperature telecommunications equipment, although the available evidence does not specify a modern automotive qualification. The MC14407L is a legacy Motorola Semiconductor device rather than a contemporary lead-free-focused component. Consequently, engineers should confirm current availability, original construction details, obsolete-material conditions, and revision-specific timing or electrical limits against the manufacturer datasheet and the authorized distributor documentation before committing a new design. Typical uses include PCM switching interfaces, digital telephone terminal equipment, voice-channel converters, telecommunications multiplexers, and embedded systems that need an A-law or mu-law PCM codec. System-level implementation also depends on the connected line-interface or DSP device, clocking arrangement, signal framing, and board-level decoupling specified in the original design documentation. The principal design consideration is that MC14407L is a legacy through-hole codec, so a modern replacement cannot be selected from package size alone. The replacement should be verified for pin-to-pin behavior, clock mode, companding law, power requirements, timing margins, and channel direction. This page synthesizes the verified distributor and datasheet references, sourcing information, and cautious replacement guidance that are not consolidated in a single manufacturer product page.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
MC145572PBR2 - ISDN U-Interface Transceiver | NXP | 44-LQFP
The NXP (formerly Freescale / Motorola) MC145572PBR2 is a single-chip ISDN U-interface transceiver designed for 160 kbps full-duplex 2B1Q transmission over a single twisted-pair copper line. Housed in a 44-pin LQFP (10x10 mm) surface-mount package, this specialized IC integrates the analog front-end, echo canceller, digital signal processor, and HDLC controller required for both the network-termination (NT) and line-termination (LT) sides of an ISDN basic-rate interface, with the side selected at power-up by a single pin. In the broader product hierarchy, the MC145572PBR2 is a specialized telecommunications IC — a sub-category of interface ICs that bridges the physical layer of legacy ISDN and 2B1Q transport systems to higher-layer HDLC processors. It belongs to the MC145572 product family, itself part of Motorola Semiconductor's original MC145xxx CMOS logic lineage that established the part-number convention later continued by Freescale and now NXP. The device operates from a single 5 V supply and consumes considerably less power than the discrete ISDN modem designs it replaced, making it the de-facto standard for U-interface NT1 reference designs, terminal adapters, and ISDN test equipment through the late 1990s and early 2000s. Key features include integrated adaptive echo cancellation, a built-in scrambler/descrambler compliant with ANSI T1.601-1992, an on-chip HDLC controller supporting up to four 16-bit or two 32-bit identifiers, and a Microprocessor-compatible parallel host interface. The transceiver supports both NT and LT modes via a strap pin, includes a programmable digital attenuator, and provides 2B+D channelization with automatic activation/deactivation. Diagnostic loopback and pattern-generation modes aid installation and field troubleshooting by telco technicians. Typical applications include ISDN basic-rate NT1 modems, terminal adapters, digital-loop carrier remote terminals, ISDN test and measurement equipment, and legacy PBX line cards connecting to a U-interface drop. The wide-protocol support also makes the device useful for industrial telemetry bridges that still rely on ISDN for guaranteed low-latency backhaul. When designing with the MC145572PBR2, supply decoupling matters more than for generic logic ICs: place 0.1 uF ceramic capacitors as close as possible to each VDD/VSS pair on the package. Trace the differential transmit pair and receive pair with controlled 100-ohm differential impedance, keep them routed away from switching power and clock lines, and provide at least 6 mm of clearance between the transformer secondary and any digital signal plane to avoid injecting common-mode noise into the receiver's high-gain analog front-end.
MC1488D - Quad EIA-232D Driver | onsemi | RS-232 Interface
The onsemi MC1488D is a monolithic four-channel EIA-232D line driver with a 14-pin SOIC package. It provides four current-limited differential outputs intended to interface data terminal equipment with data communications equipment, with typical output current limited to ±10 mA and a minimum power-off source impedance of 300 ohms. An EIA-232D line driver is a type of RS-232 interface driver that converts logic-level signals into the voltage-domain signals used by RS-232 communications equipment. Within the broader hierarchy, it is a line driver and interface IC within communications and power-management signal conditioning. Its four channels allow one package to support several unidirectional data paths when the system already provides the required receiver and supply circuitry. Key features include four independent driver channels, typical current-limited output of ±10 mA, and a minimum power-off source impedance of 300 ohms. The current limiting helps control output current when a receiver or connected circuit imposes an abnormal load. The MC1488D also provides simple slew-rate control, an important characteristic for reducing unwanted transitions on slow RS-232 links. Technically, the device is designed around the EIA-232D interface requirements identified in the onsemi datasheet. Because MC1488D contains drivers rather than receivers, it cannot replace a complete RS-232 transceiver without external receiver circuitry. In a typical interface, logic signals enter the driver inputs and leave through four EIA-232D output channels. The receiver and any required level translation are separate functions. Typical uses include legacy RS-232 ports, data terminal equipment, data communications equipment, industrial control interfaces, and embedded systems that retain an EIA-232D connection. The MC1488D is also useful as the transmit-side element in a multi-channel interface where a companion receiver IC is already present. Designers should verify the supported supply voltage, input thresholds, output levels, timing, and absolute maximum ratings directly against the manufacturer datasheet before implementation. PCB layout should preserve short output paths, provide an appropriate ground reference, and avoid placing sensitive analog signals beside the driver outputs. This page combines verified manufacturer and distributor information, source-backed drop-in candidates, interface-selection guidance, and practical PCB considerations to provide engineering context beyond a basic MC1488D catalog listing.
MC1488DG - Quad EIA-232D Driver | onsemi | RS-232 Interface
onsemi MC1488DG is a monolithic quad line driver designed to interface data terminal equipment with data communications equipment using the EIA-232D standard. The device provides four driver channels, operates from a 5 V supply, and uses a 14-pin SOIC package. Its typical output current is ±10 mA per channel, with current limiting built into the outputs. The MC1488DG is intended for RS-232 transmitter functions rather than receiver functions, so it must be paired with a suitable quad receiver when full bidirectional communication is required. An EIA-232D line driver is a type of interface transceiver component that converts logic-level signals into RS-232 voltage levels for transmission between data terminal equipment and data communications equipment. In the broader hierarchy, MC1488DG belongs to the interface IC category, specifically the RS-232 driver family. Its quad-channel architecture reduces the component count in systems requiring several serial data outputs while preserving the signal and power connection conventions established for EIA-232D equipment. The principal features of MC1488DG include four independent driver outputs, integrated output current limiting, and a typical output current capability of ±10 mA. The driver is designed for conformance with EIA-232D interface requirements, and its monolithic construction places the driver functions in one 14-pin SOIC package. The design supports equipment requiring multiple RS-232 transmit channels, including computer peripherals, industrial data links, test equipment, and legacy communications equipment. Technically, the MC1488 belongs to the family of bipolar RS-232 line drivers that use positive and negative supply rails to develop the bipolar voltage levels required by the interface standard. The MC1488 data also identifies SN55188 and SN75188 as related monolithic quadruple line drivers. Because MC1488DG is a driver-only device, engineers should check signal levels, supply requirements, output polarity, and protection needs against the original system interface before using it in a redesigned board. Typical applications include industrial serial-port controllers, laboratory instrumentation, point-of-sale terminals, data acquisition equipment, and embedded systems that retain an RS-232 output interface. In a multi-channel design, each logic input can drive a corresponding RS-232 output, while a separate receiver IC handles incoming signals. This separation is important because the MC1488 provides four transmit channels but no integrated receive channels. A key design consideration is to preserve the original board footprint and verify every pin assignment before substitution. The 14-pin SOIC package is suitable for conventional surface-mount assembly, but RS-232 cables connect to externally exposed connector pins rather than directly to the IC. External protection, grounding, connector geometry, and cable-routing decisions remain necessary to achieve reliable system-level communications. This page combines the verified manufacturer and distributor references for MC1488DG with package information, interface intent, sourcing links, and identified pin-compatible alternatives. It also distinguishes the driver-only MC1488DG from complete RS-232 transceiver functions, helping engineers select the correct replacement without confusing interface direction or package compatibility.
MC1488M - Quad EIA-232D Driver, SOIC-14 | onsemi
onsemi MC1488M is a monolithic quad line EIA-232D driver with four current-limited outputs, supplied in a 14-pin SOIC package. The device provides typical output currents of ±10 mA and a minimum power-off source impedance of 300 Ω. It is designed to interface data terminal equipment with data communications equipment using the EIA-232D signal convention. An EIA-232D line driver is a transmitter within the broader interface IC and RS-232 transceiver categories. Its role is to convert logic-level transmit signals into bipolar voltage levels suitable for EIA-232D communication links. The MC1488M contains four independent driver channels, allowing one package to support multiple serial-data outputs in equipment such as modems, computer interfaces, industrial communications equipment, and legacy peripheral systems. The principal features of the MC1488M include four driver channels, typical current-limited output capability of ±10 mA, a 300 Ω minimum power-off source impedance, and EIA-232D interface conformance. Its 14-pin SOIC package supports surface-mount PCB assembly while reducing the footprint required by a discrete transistor driver arrangement. The M suffix identifies the surface-mount ordering variant presented by onsemi. Internally, the MC1488M combines four line-driver stages with supply-voltage protection arrangements described in the associated device literature. Its monolithic construction provides a practical alternative to separate transistor or MOSFET driver circuits. Because the output stage is designed to source and sink current rather than operate as a logic-level CMOS output, the circuit should be evaluated as an EIA-232D interface stage, not as a general-purpose push-pull logic driver. Typical uses include four-channel RS-232 transmit ports, data terminal equipment, data communications equipment, printer interfaces, and industrial data links. Designers combining this driver with a receiver can construct a complete asymmetric RS-232 interface. The component is especially relevant to legacy systems that require more than two independently driven EIA-232D outputs while retaining a surface-mount footprint. The primary design consideration is the external interface network and supply arrangement. EIA-232D implementations commonly use series resistors and capacitive or diode-clamped protection to manage transient conditions, while supply bypassing must be placed close to the device. Engineers should also verify receiver compatibility, cable requirements, logic levels, and all electrical limits against the manufacturer datasheet before substituting the part into a live design. This product page consolidates the verified manufacturer and distributor information for MC1488M with package details, sourcing guidance, practical design notes, and a strict assessment of available drop-in alternatives. Where the supplied source material does not establish an exact same-package replacement, the page identifies that limitation instead of presenting an unverified substitution as drop-in compatible.
MC1488MG - Quad EIA-232D Driver | onsemi | RS-232
The onsemi MC1488MG is a monolithic four-channel RS-232 line driver with a 4/0 driver-to-receiver configuration, current-limited outputs rated at ±10 mA typical, and a 14-pin gull-wing SOIC package. It is designed for data-terminal equipment and data-communications equipment that require an EIA-232D-compatible transmit interface. The MC1488MG is identified as the commercial extended-temperature grade in distributor and catalog records. An RS-232 line driver is an interface IC that converts digital logic-level signals into unbalanced, bipolar voltage levels suitable for serial data links. Within the signal-chain hierarchy, it belongs to the RS-232 interface-driver family, combines with an RS-232 receiver to form a complete communications path, and ultimately provides the physical-layer function required between data terminal equipment and data communications equipment. Unlike a transceiver, the MC1488MG provides four driver channels and no receiver channels. The primary verified characteristics are four independently available line-driver outputs, EIA-232D conformance, typical current limiting of ±10 mA, a 14-pin SOIC package with gull-wing leads, and a commercial extended temperature grade. The output current limit protects the driver stage when a connected RS-232 line is shorted or misconfigured. Because four transmit channels are provided, one device can support four RS-232 outputs while reducing the number of external line-driver packages required. The MC1488MG is intended for legacy and industrial serial-control equipment where EIA-232D signaling remains required. Appropriate uses include multi-port controller interfaces, equipment test systems, point-to-point serial links, and control panels. The device requires suitable bypass capacitance and careful grounding because the implemented system also depends on cable characteristics, receiver thresholds, protection networks, and the voltage levels allowed by the selected RS-232 endpoint. For new designs, engineers should verify signal polarity, baud rate, logic thresholds, and electrical limits against the current manufacturer datasheet before layout release. The supplied search results confirm the EIA-232D driver function, four-output organization, ±10 mA typical output current, and 14-pin SOIC format, but several detailed timing, voltage, temperature, and absolute-maximum values were not included in the retrieved records. This page combines verified distributor and manufacturer-linked information, structured technical context, pin-compatible replacement guidance, and practical sourcing notes. It also separates confirmed electrical facts from parameters that require datasheet verification, helping engineers avoid assigning unsupported specifications to this legacy-compatible RS-232 interface device.
MC1488N - Quadruple RS-232 Line Driver | Texas Instruments
Texas Instruments MC1488N is a monolithic quadruple RS-232 line driver with four driver channels, 10 mA typical current-limited output, and a minimum 300 ohm power-off output impedance. Designed for data-terminal equipment and data-communications equipment interfaces, the device operates from a 5 V supply in a 14-pin PDIP package rated for 0 to 70 degrees C. A line driver is a digital interface circuit that converts low-voltage logic signals into RS-232-compatible voltage levels. The MC1488 belongs to the RS-232 driver hierarchy, where a line driver interfaces data-terminal equipment with data-communications equipment. Its four channels allow one package to support four unidirectional serial data paths, reducing component count in multi-port or multi-channel RS-232 equipment. The device is designed to meet or exceed ANSI EIA/TIA-232-E and ITU Recommendation V.28 requirements. According to the Texas Instruments manufacturer datasheet, each output includes current limiting, and the power-off output impedance is at least 300 ohms. A series diode is used at each supply-voltage terminal, while the output slew rate can be controlled through the load capacitance connected to each driver. The MC1488N is designed to be interchangeable with the Motorola MC1488, which supports PCB sourcing flexibility where the original function is required. The manufacturer datasheet identifies the MC1488, SN55188, and SN75188 as monolithic quadruple line drivers, but device ordering suffixes, temperature ranges, and package variants must still be checked before substitution. The N suffix identifies the 14-pin PDIP configuration shown in the verified Texas Instruments part-details data. Typical uses include RS-232 interfaces in data-terminal equipment, data-communications equipment, industrial control systems, point-of-sale equipment, printers, and legacy serial-port adapters. It is particularly useful where multiple RS-232 channels share a common logic interface and a through-hole package is preferred for serviceability or manual assembly. PCB layout should keep each driver output away from sensitive analog and high-speed digital traces because RS-232 transitions can produce edge-related EMI. The data input pins must be driven only when the supply is valid, and unused outputs should be handled according to the manufacturer datasheet rather than left as floating high-impedance nodes. Confirm output polarity and logic levels before interchanging it with a receive/transceiver device.