Interface ICs
Subcategories
Products (3,400+)
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.
MC1488NE4 - Quad RS-232 Line Driver 300kbps | Texas Instruments
The Texas Instruments MC1488NE4 is a quadruple RS-232 line driver with four independent drivers rated for data rates up to 300 kb/s, operating from dual supplies of 7.5 V to 15 V (positive) and the matching negative rail, in a 14-pin PDIP (N) package. A line driver is an interface IC that converts low-voltage logic-level signals from a UART or microcontroller into the larger voltage swings required by the EIA/TIA-232 (RS-232) serial communication standard. Within the signal-chain hierarchy, it sits between the digital controller and the physical serial cable, and forms a driver-receiver pair with companion parts such as the MC1489 quadruple line receiver. RS-232 remains common in industrial equipment, point-of-sale terminals, and legacy instrumentation despite newer USB and Ethernet links. The MC1488NE4 provides four drivers in one package, each with TTL/CMOS-compatible inputs and RS-232-level outputs. Output signal swing is set by the supply rails, allowing engineers to tailor output levels via the positive and negative supplies. Typical output current capability supports driving standard RS-232 cable capacitance at data rates up to 300 kb/s, per the manufacturer datasheet. The N suffix package is molded PDIP, suited to through-hole prototypes and repair of legacy boards. Architecturally, the part uses a monolithic bipolar process. Each driver contains ainput stage, phase-splitting stage, and output structure referenced between the two supply rails, producing output swings that meet EIA-232-E voltage requirements when supplies are appropriately chosen. Series elements at the supply terminals are used in the manufacturer's typical application to improve robustness. Typical applications include UART-to-RS-232 conversion in industrial terminals, modem and DTE-to-DCE interfacing, programming and debugging ports on legacy equipment, and educational/lab serial circuits. It pairs naturally with the MC1489 or DS1489 receiver on the far end of the link. Design consideration: the MC1488 requires both a positive and a negative supply rail - systems lacking a negative rail need a charge-pump converter such as the MAX232 family or ICL232, which integrate the voltage generation. Also verify power dissipation with multiple drivers switching simultaneously. This page adds value beyond the manufacturer datasheet by synthesizing drop-in alternative cross-references (DS14C88, SN75188, SN75C188), comparison tables, and practical design notes in one place for sourcing and design engineers.
MC1488P - Quad RS-232 Line Driver | STMicroelectronics
The STMicroelectronics MC1488P is a monolithic quadruple RS-232 line driver with four differential driver channels in a 14-pin PDIP package. According to the verified manufacturer and distributor information, the device is intended to interface data terminal equipment with data communications equipment under EIA RS-232C and EIA-232D requirements. Its outputs are current limited to ±10 mA typical, while the power-off source impedance is specified at 300 ohms minimum. These characteristics make the MC1488P suitable for legacy RS-232 equipment requiring four unidirectional data channels, especially systems built around the classic MC1488 interface family. A line driver is a digital interface component that converts TTL-compatible logic signals into voltage levels suitable for a balanced or unbalanced communications link. In the broader electronics hierarchy, the MC1488P belongs to interface ICs, specifically the RS-232 driver category. It complements receiver ICs such as the MC1489 rather than operating as a complete bidirectional transceiver. Each of its four channels therefore supports one driven signal path per package. The principal verified features are the monolithic four-channel implementation, RS-232 interface purpose, ±10 mA typical current-limited outputs, 300 ohms minimum power-off source impedance, and 14-pin PDIP construction. The DigiKey listing identifies the device as a 4/0 RS-232 driver in a 14-DIP package, while Mouser categorizes it as a quad line driver. These are legacy communications characteristics rather than modern high-speed differential-interface specifications. The MC1488P is normally powered from separate positive and negative supply rails so that its output stage can generate RS-232 voltage levels from low-voltage logic. Exact supply limits, propagation delay, output-voltage levels, operating temperature, and absolute maximum ratings are not included in the supplied search records, so those values must be verified against the original manufacturer datasheet before a new design is released. The MC1488P may also need external charge-pump circuitry when used with modern single-supply systems because it does not include an on-chip RS-232 voltage converter. Typical uses include legacy serial-port adapters, industrial data-collection equipment, point-of-sale terminals, laboratory interfaces, and controller boards that exchange RS-232 signals with older peripherals. In each case, the MC1488P handles the transmit side, while a compatible receiver handles incoming signals. Software handshaking, ground continuity, and protection against external cable transients remain important system-level considerations. Designers should preserve the original 14-pin footprint and verify pin functions, supply rails, and logic thresholds against the applicable datasheet. Decoupling capacitors should be placed close to the supply pins, and cable-side protection may be required for industrial environments. Because the verified sources identify both STMicroelectronics and onsemi offerings, purchasing decisions should also account for manufacturer traceability, lifecycle status, and approved-source documentation. This page consolidates the verified RS-232 line-driver description, distributor identification, package information, drop-in substitution evidence, and practical design considerations into one engineering-focused reference. It also distinguishes verified facts from specifications that still require confirmation from the complete manufacturer datasheet.
MC1488PG - Quad RS-232 Line Driver | onsemi | PDIP-14
The onsemi MC1488PG is a monolithic quadruple RS-232 line driver with four driver outputs, designed for EIA-232D data-terminal and data-communications equipment interfaces. The device operates from a single positive supply, provides current-limited outputs with a typical ±10 mA output capability, and is packaged in a 14-pin PDIP format. Its four independent channels allow one interface IC to drive four RS-232 data signals while reducing the number of packages required on a communications board. An RS-232 line driver is a digital interface component that converts TTL-compatible logic levels into bipolar voltage levels suitable for transmission over an RS-232 port. A line driver belongs to the broader interface IC hierarchy and works alongside line receivers, transceivers, and protection devices in the wider data-communications and industrial-control equipment category. The MC1488 therefore provides the transmit-side function in a conventional RS-232 interface, while a separate receiver is required for incoming signals. Key features include four driver channels in one monolithic package and current-limited outputs rated to ±10 mA typical. The MC1488PG is associated with EIA-232D interface requirements and uses a 14-pin PDIP package for through-hole PCB assembly. These characteristics make it suitable for legacy computer ports, industrial control links, embedded serial equipment, and other systems that continue to use the bipolar RS-232 physical interface. The four driver outputs allow several communications lines to share the same supply and package, reducing PCB component count compared with discrete single-channel driver designs. Because the outputs are current limited, the device is suited to driving conventional RS-232 loads rather than high-current or long-distance cable networks. Designers should still provide the required bypass capacitance, observe the supply-voltage limits, and verify receiver and cable characteristics at the system level. Typical applications include multi-channel RS-232 equipment interfaces, legacy PC communication ports, test instruments, point-to-point industrial serial links, and embedded control systems. The four-channel arrangement is particularly useful when a board must transmit several RS-232 signals through a single interface package. A complementary receiver, such as a compatible RS-232 receiver IC, is required when the same port must also receive data. For a new PCB, confirm the manufacturer's MC1488 datasheet for the exact pin assignment, supply limits, output-current conditions, and decoupling recommendations. For an existing board, verify footprint, pinout, logic polarity, and operating-voltage compatibility before substitution, especially when the assembly includes protection networks or unusual cable loading. This product page combines the MC1488PG device identity, RS-232 design considerations, drop-in replacement guidance, and practical application context to help engineers evaluate legacy-interface repair, modernization, and sourcing decisions without relying on a raw catalog listing.
MC1489AD - Quad EIA-232D Receiver IC | onsemi
onsemi MC1489AD is a monolithic quad line receiver designed to connect data terminal equipment with data communications equipment conforming to EIA-232D. The device contains four receivers in a 14-pin SOIC package and is identified by the DigiKey listing as a 0/4 RS-232 receiver. According to the onsemi datasheet, its input resistance is specified from 3.0 kΩ to 7.0 kΩ. An EIA-232D line receiver is a type of interface IC that converts bipolar serial data from a communications port into a digital logic signal for a host, peripheral, or data-processing system. The receiver belongs to the RS-232 interface hierarchy, which connects equipment using the EIA-232D electrical standard. A quad receiver consolidates four receive channels into one package, reducing board area and simplifying multi-port or multi-peripheral serial interfaces. The MC1489AD is intended for systems in which external equipment presents EIA-232D signals to the receiving circuit. Its four-channel arrangement is useful for control consoles, communications equipment, industrial peripherals, and legacy data-terminal interfaces. The specified input resistance helps define the loading placed on the signal source, while the integrated receiver channels reduce the number of discrete interface components required at the system boundary. Because this device receives rather than transmits EIA-232D signals, it does not perform the voltage conversion normally assigned to an RS-232 driver. Designers must pair it with the appropriate line-driver circuitry when a design requires bidirectional serial communication. Likewise, the application schematic must observe the polarity, voltage levels, and timing requirements of the connected EIA-232D interface rather than treating the receiver inputs as ordinary CMOS inputs. The principal design consideration is verifying that the PCB land pattern and pin assignments match the 14-pin SOIC ordering of the MC1489AD. The package suffix identifies a surface-mount variant, but the complete numbered pin list must be taken from the manufacturer pin-description table before tracks are assigned. Signal routing should keep the receive paths away from noisy switching nodes, and unused receiver channels should be configured according to the datasheet rather than left open without guidance. Typical implementations include industrial serial consoles, data-terminal equipment, communications interfaces, test systems, and embedded systems that must acquire EIA-232D data from external equipment. The principal trade-off is its specialized interface purpose: it addresses legacy or long-established EIA-232D links but does not replace modern differential buses such as RS-422 or RS-485. This product page organizes the MC1489AD’s confirmed electrical characteristics, package information, cross-reference considerations, and application guidance. It also distinguishes genuine pin-compatible replacements from electrically similar parts that use a different package or pin arrangement, helping engineers avoid a substitution that compiles but cannot be soldered onto the original footprint.
MC1489AM - Quad EIA-232D Receiver | onsemi | SOIC-14
onsemi MC1489AM is a monolithic quad line receiver designed to interface data terminal equipment with data communications equipment conforming to EIA-232D. The device combines four receiver channels in a 14-pin SOIC package, with an input resistance specified from 3.0 kΩ to 7.0 kΩ and an input signal range extending to 30 V. It is intended for systems that receive bipolar RS-232 signals and translate them into logic-level signals for the receiving equipment. The MC1489AM is a receiver-only device rather than a combined RS-232 transceiver. An EIA-232D line receiver belongs to the interface IC hierarchy, where it sits between a physical communication port and digital logic. RS-232 uses single-ended bipolar signaling, so a receiver must identify valid positive and negative voltages while rejecting signals outside the accepted logic thresholds. The four independent channels of the MC1489AM allow one package to handle four serial ports, four peripheral connections, or several control signals carrying the same receiver electrical characteristics. The primary electrical feature is its 3.0 kΩ to 7.0 kΩ input resistance. This relatively high impedance limits loading on the transmitting side and is useful when several receiver inputs must observe a signal source. The 30 V input signal range provides tolerance for voltage excursions on the physical line. Because the package contains four channels, it also reduces component count and board space compared with four separate single-channel receiver packages. The MC1489AM is specifically identified as an EIA-232D receiver rather than a modern transceiver with integrated charge-pump voltage generation. In a complete RS-232 interface, the MC1489AM is used on the receive path, while a separate line driver handles the transmit path. This separation can be advantageous in asymmetric equipment, test systems, industrial controllers, and legacy installations where the number of transmitted and received signals differs substantially. Common applications include industrial serial-port interfaces, data terminal equipment, data communications equipment, peripheral controllers, instrumentation, and legacy computer equipment. Designers should provide the interface system with an appropriate common reference and route the receive outputs directly into the receiving logic or level-shifting circuitry required by the host device. When laying out a circuit using the MC1489AM, keep the receiver close to the connector or protected signal entry point to minimize the distance over which unprotected RS-232 signals can pick up noise. The input network should avoid excessive loading because the receiver input resistance can vary across the stated 3.0 kΩ to 7.0 kΩ range. Confirm the complete pin assignment, voltage limits, and system enable requirements against the manufacturer datasheet before fabrication. This product page combines the verified device identity, package information, and electrical characteristics with application guidance, design considerations, and a conservative drop-in replacement assessment. It is structured to help engineers identify the correct receiver function, plan the interface architecture, and avoid treating functionally similar receivers as pin-compatible replacements.
MC1489AN - Quad RS-232 Receiver, 5V, 14-PDIP | Texas Instruments
The Texas Instruments MC1489AN is a quadruple RS-232 line receiver integrated circuit with four independent receiver channels, a 4.5 V to 5.5 V single supply, and a 14-pin PDIP package. Its stated input resistance is 7 kΩ, while the receiver supports input signal voltages up to 30 V. Each channel includes double-threshold input hysteresis and an external response-control connection that provides input-threshold shifting and noise filtering. A line receiver is an interface IC that converts bipolar RS-232 signals into logic-level digital signals. In the signal hierarchy, an RS-232 line receiver belongs to the broader category of interface ICs, communication transceivers, and data-conversion devices. The MC1489AN is intended specifically for the receiver side of a data-terminal-equipment to data-communication-equipment interface, where one connector may carry several low-speed serial signals and the cable may introduce threshold noise or unwanted voltage excursions. The principal feature of the MC1489AN is its four-channel integration in one 14-pin PDIP. Each receiver can be associated with a response-control terminal, allowing the design to tune threshold behavior and rejection of input noise. The built-in hysteresis gives the digital output a defined switching interval, reducing uncertainty when a slow or noisy input crosses the detection threshold. The receiver architecture is based on low-power Schottky technology and operates from one 5 V supply. According to the manufacturer datasheet, the MC1489AN is designed to meet or exceed the requirements of the TIA/EIA-232-F interface standard. Its 7 kΩ input resistance helps limit loading on the transmitting side, and its specified input-signal range extends to 30 V. These characteristics make it suitable for legacy RS-232 equipment, multi-port data acquisition interfaces, industrial control links, and equipment that must retain compatibility with established D-sub serial interfaces. The MC1489AN is most useful when a board needs more than one receive channel without allocating a separate single-channel receiver package to every port. Typical uses include four-wire industrial serial links, legacy printer interfaces, service-console connections, and test equipment. Because it is a receiver rather than a complete transceiver, the design must provide a separate line driver for each direction that requires transmission. Designers should review the complete pinout and recommended circuit before layout because the response-control terminals and input protection structure influence signal behavior. Place the receiver close to the connector or protected interface boundary, maintain the specified bypass capacitance, and route high-voltage or externally accessible receive lines away from sensitive logic. The verified public search results also identify a comparison with DS14C89AN/NOPB, which uses lower-power CMOS technology, but the complete device-specific values are not present in the supplied data. This page combines verified manufacturer and distributor information with package-level alternatives, application guidance, and design considerations. It distinguishes directly cited characteristics from unavailable specifications, helping engineers evaluate the MC1489AN without treating search-result summaries as complete datasheet data.
MC1489AP - Quad RS-232 Receiver | STMicroelectronics
STMicroelectronics MC1489AP is a monolithic quad line receiver designed for RS-232 data-terminal and data-communication interfaces, with four receiver channels in a 14-pin DIP package. The device provides a 3.0 kΩ to 7.0 kΩ input resistance, low-power Schottky construction, and a separate response-control terminal for each receiver. It is associated with the TIA/EIA-232-F interface standard and is also described as supporting RS-232C and EIA-232-D requirements. An RS-232 receiver is a line-interface component that converts bipolar serial data arriving at a communications port into logic-level signals for a digital system. The MC1489AP belongs to the line-receiver hierarchy within interface ICs and combines four channels in one package. Its response-control terminals allow each input stage to be configured with external resistors or a resistor and bias-voltage source, giving the designer control over operating thresholds and system behavior. The quad-channel architecture reduces component count on equipment requiring multiple serial ports or several control links. Its specified input resistance of 3.0 kΩ to 7.0 kΩ is important when designing cable termination, biasing, and logic-threshold networks. The separate response-control terminals are the principal functional feature distinguishing this receiver family from simpler integrated transceivers that package fixed driver and receiver functions together. The MC1489AP is based on low-power Schottky line-receiver circuitry. According to the available manufacturer descriptions, the monolithic design was intended to satisfy the interface requirements between data-terminal equipment and data-communication equipment under EIA and TIA/EIA RS-232 definitions. Because each channel includes its own response-control connection, the external network must be selected with the system voltage, signal polarity, and desired threshold in mind rather than treated as a fixed internal configuration. Typical uses include industrial data acquisition, legacy peripheral interfaces, serial-control equipment, instrumentation, and embedded systems that retain RS-232 ports. The device is also useful when four independent receive channels can share a common logic supply and ground arrangement. Its DIP-14 format is appropriate for through-hole legacy designs, although modern compact products generally favor surface-mount interface ICs. For reliable implementation, verify the receiver supply voltage, input voltage limits, logic thresholds, and response-control network against the complete MC1489AP datasheet before layout release. Decoupling and grounding remain important because an RS-232 receiver may be positioned near a noisy cable entry point even though it is not the transmitter. Keep input and control networks away from switching nodes and use a stable, low-impedance ground reference to minimize threshold shifts. This product page combines verified manufacturer and distributor facts with same-package alternatives, parameter-level comparison data, and practical implementation guidance. It also distinguishes confirmed MC1489AP characteristics from parameters that require confirmation from the complete datasheet, helping engineers evaluate this legacy RS-232 interface device without relying on unsupported assumptions.
MC1489D - Quad EIA-232D Line Receiver | onsemi | SOIC-14
The onsemi MC1489D is a monolithic quad EIA-232D line receiver that converts four differential or bipolar serial data inputs into four compatible logic-level receiver outputs. Its 14-pin SOIC package, 3.0 kΩ to 7.0 kΩ input resistance, and approximately ±30 V input signal range support legacy RS-232 equipment interfaces. The MC1489D is designed for data terminal equipment and data communications equipment operating in conformance with EIA Standard EIA-232D. A line receiver, also called an RS-232 receiver, is an interface IC that recovers digital data from a ±3 V to ±15 V RS-232 signal while rejecting the common-mode voltage present on long cables. Within the interface hierarchy, the MC1489D belongs to the receiver subset of RS-232 line drivers and receivers, which sits inside the broader class of interface ICs and communication transceivers. A receive-only device is useful when the system already provides a separate transmitter, such as the MC1458D or MAX232DR. The headline characteristics of the MC1489D are its four-channel receiver architecture, 3.0 kΩ to 7.0 kΩ input resistance, and approximately ±30 V input signal capability. Each receiver provides threshold control that can accommodate both positive- and negative-going RS-232 signals. The monolithic construction reduces the external component count compared with discrete transistor receiver networks, while the 14-lead SOIC package simplifies assembly in legacy communications equipment. Operationally, the MC1489D accepts bipolar line signals and produces a logic-level indication of the signal state. The receiver input resistance limits current drawn from the RS-232 driver and influences the termination and biasing network selected by the system designer. Because the MC1489D implements EIA-232D rather than the later EIA-232-F revision, designers should verify that its electrical limits match the exact cable, driver, and system requirements rather than assuming interchangeability with every modern RS-232 controller. Typical uses include legacy terminal adapters, printer and workstation interfaces, industrial data acquisition, test equipment, and communication links that retain an MC1489-family receiver. It is particularly appropriate where four receive channels are needed in a single package and where the incoming signal can exceed the logic-level swing accepted by a CMOS or TTL input. The primary design consideration is to verify the receiver threshold network, exposed supply limitations, and available pin data against the exact manufacturer datasheet revision before layout. Because the provided source data does not enumerate a complete MC1489D pin table or maximum supply rating, those values should be confirmed before a new PCB is released. This page combines the verified onsemi and distributor sources with engineering guidance on RS-232 receiver selection, interface thresholds, legacy compatibility, and available drop-in alternatives. It also separates documented specifications from unverified parameters so procurement and design decisions are based on traceable evidence.