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NXP Semiconductors I74F657D,112
- Part No.:
- I74F657D,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
I74F657D,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,634
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Product details
Overview
I74F657D,112 from NXP Semiconductors (formerly Philips) is an octal 3-state transceiver with integrated 8-bit parity generator/checker, designed for bidirectional data bus interfacing in industrial control and legacy computing systems. It features 16 bidirectional I/O ports (A0–A7, B0–B7), a programmable ODD/EVEN parity select input, PARITY and ERROR pins, and operates at 5 V ±10% across –40 °C to +85 °C.
For engineers reviewing the I74F657D,112 datasheet, I74F657D,112 pinout, I74F657D,112 application, or I74F657D,112 equivalent, key selection criteria include its 64 mA sink capability on B-side outputs, 8.0 ns typical propagation delay (An→Bn), high-impedance input loading (70 µA), and dual-mode parity validation for error detection in synchronous parallel buses.
Technical Context
The I74F657D,112 integrates two core functions: an octal non-inverting transceiver (like 74F245) and an 8-bit parity generator/checker (like 74F280A). Its T/R input controls directionality-HIGH enables A→B transmission with PARITY output generation; LOW enables B→A reception with PARITY input validation and ERROR assertion.
Parity operation is fully synchronous with data flow: during transmit, the number of HIGH bits on A0–A7 determines PARITY output logic state per ODD/EVEN setting; during receive, the same count on B0–B7 plus PARITY input determines ERROR output state. The OE input globally disables all outputs into high-impedance mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/FAST logic rails and noise margin compliance. |
| Propagation Delay (An→Bn) | 8.0 ns typical - Enables reliable timing in high-speed parallel bus systems up to ~125 MHz clock-equivalent rates. |
| B-port Output Sink Current | 64 mA - Supports direct drive of multiple TTL loads or termination resistors without external buffers. |
| A-port Output Sink Current | 24 mA - Sufficient for driving local bus segments or intermediate logic stages with low fan-out. |
| Input Loading (A/B ports) | 70 µA HIGH/LOW - Reduces bus loading by >8× versus standard FAST inputs, preserving signal integrity on shared lines. |
| Operating Temperature | –40 °C to +85 °C - Qualified for industrial environments including factory automation and telecom infrastructure. |
| Package Type | SOT137-1 (24-pin plastic SOIC, 7.5 mm body width) - Surface-mount compatible with automated PCB assembly and space-constrained designs. |
Pinout & Package
Package: 24-pin plastic small outline (SOIC), 7.5 mm body width, JEDEC MS-013 compliant (SOT137-1).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable, active LOW) | Global 3-state control: HIGH forces all A/B ports and PARITY into high-impedance; essential for bus arbitration. |
| 2 | ERROR (Parity Error Output) | Active-HIGH open-collector output asserting mismatch between received data and PARITY input; requires pull-up for logic interface. |
| 3 | ODD/EVEN (Parity Mode Select) | Configures parity generation/checking logic: LOW = even, HIGH = odd; sets reference for PARITY and ERROR behavior. |
| 4 | T/R (Transmit/Receive Control) | Direction selector: HIGH = A→B (PARITY output active); LOW = B→A (PARITY input active, ERROR asserted on mismatch). |
| 5–12 | B0–B7 (Bidirectional B-port I/O) | Bus-facing side with 64 mA sink capability; connects to system data bus; driven during transmit, sampled during receive. |
| 13–20 | A0–A7 (Bidirectional A-port I/O) | Local/device side with 24 mA sink capability; interfaces to microcontroller or ASIC data paths; lower drive suits point-to-point links. |
| 21 | VCC | +5 V power supply pin (Pin 7 in DIP variant; Pin 21 here per SOIC pinout). |
| 22 | PARITY (Parity Input/Output) | Time-multiplexed: output during A→B transmit (generated parity), input during B→A receive (expected parity value). |
| 23–24 | GND | Ground reference pins (dual GND for noise reduction; Pins 18 & 19 in DIP, Pins 23 & 24 in SOIC). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated transceiver + parity logic | Eliminates need for separate 74F245 and 74F280A ICs, reducing board area, BOM count, and interconnect complexity. |
| 70 µA input loading on A/B ports | Enables >30-unit load capacity on shared buses without signal degradation, unlike standard FAST inputs (600 µA). |
| 64 mA B-port sink capability | Drives terminated 50 Ω bus stubs or multiple TTL inputs directly, avoiding external line drivers in industrial backplanes. |
| Programmable ODD/EVEN parity mode | Supports interoperability with diverse host systems using either parity convention without hardware redesign. |
| ERROR output with deterministic timing | Valid ERROR assertion occurs ≥ (B→A propagation) + (A→PARITY propagation), enabling precise setup/hold window planning. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Bus Extension |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Transceiver mediates address/data multiplexing; parity generator/checker validates integrity of configuration writes and status reads across noisy rack-mounted backplanes. Use Value: 64 mA B-port drive sustains signal integrity over 30 cm ribbon cable runs; ERROR output triggers diagnostic interrupts on parity failure, improving system reliability. |
Use Scenario: Extending 8-bit memory bus between mainboard and add-on RAM modules in vintage minicomputers or embedded controllers. IC Role / Device Role / Timing Role: Buffers isolate timing domains; PARITY output ensures write data integrity before latching; ERROR input flags read corruption during refresh cycles. Use Value: 8.0 ns An→Bn delay meets tight 100 ns bus cycle requirements; ODD/EVEN select accommodates both original and upgraded memory subsystems. |
| Telecom Line Card Data Mux | Test Equipment Parallel I/O Interface |
|
Use Scenario: Aggregating status signals from multiple DS0 channels onto a centralized monitoring bus in carrier-grade line cards. IC Role / Device Role / Timing Role: A-ports collect channel alarms; B-ports feed aggregated stream to processor; parity validates alarm payload integrity across EMI-prone card edges. Use Value: –40 °C to +85 °C rating ensures operation in sealed chassis; 70 µA input loading prevents loading-induced skew across 16-channel fan-in. |
Use Scenario: Interfacing automated test equipment (ATE) with device-under-test (DUT) parallel ports requiring real-time pass/fail feedback. IC Role / Device Role / Timing Role: Transceives stimulus/response vectors; PARITY generation confirms vector delivery; ERROR output halts test sequence on detected corruption. Use Value: OE-controlled 3-state allows dynamic bus sharing among multiple DUTs; deterministic ERROR timing enables sub-microsecond fault response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver-with-parity applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F657N | Dual-inline package (DIP, SOT222-1); identical electrical specs but through-hole mounting; no SOIC footprint compatibility. | Preferred for prototyping, repair, or legacy through-hole PCBs; unsuitable for automated SMT production. | Select SN74F657N only when DIP socketing or hand-soldering is required; not drop-in for I74F657D,112 layouts. |
| 74ACT657 | Advanced CMOS (ACT) family: 3.3 V/5 V tolerant, 12 mA B-port sink, 5.5 ns max tPLH, lower ICC (20 mA typ). | Better suited for mixed-voltage systems or low-power industrial gateways; lacks industrial temp grade in standard offerings. | Choose 74ACT657 for new designs targeting lower power or 3.3 V compatibility; verify ERROR timing alignment with system clocks. |
Compared with SN74F657N and 74ACT657, the I74F657D,112 uniquely combines industrial temperature range, SOIC packaging, and 64 mA B-port drive in a single legacy-compatible solution-making it optimal for volume-manufactured, noise-immune, surface-mount industrial bus interfaces where proven reliability outweighs power savings.
Availability
I74F657D,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer memory extensions, telecom line card data muxing, test equipment parallel I/O interfaces, and embedded controller bus bridging requiring stable component supply across extended product lifecycles.
Supply support for I74F657D,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance analog and logic ICs for industrial, automotive, and communication applications.
The I74F657D,112 belongs to the 74F FAST logic family, engineered for high-speed, low-noise bus interfacing in mission-critical industrial systems where timing predictability and robustness supersede ultra-low power.
FAQ
What is the operating voltage range for the I74F657D,112?
The I74F657D,112 operates over a supply voltage range of 4.5 V to 5.5 V, with nominal 5 V operation. This range ensures compatibility with standard TTL/FAST logic families and provides sufficient noise margin for industrial environments where supply ripple may occur. Operation outside this range risks violating absolute maximum ratings and may cause functional failure or accelerated wear.
How does the PARITY pin function in transmit versus receive mode on the I74F657D,112?
On the I74F657D,112, the PARITY pin serves dual roles: during transmit (T/R = HIGH), it outputs generated parity based on A0–A7 bit count and ODD/EVEN setting; during receive (T/R = LOW), it accepts expected parity as an input to validate B0–B7 data. This time-multiplexed behavior eliminates need for separate parity I/O pins, conserving package real estate while maintaining full protocol flexibility.
What is the maximum sink current supported by the B-port outputs of the I74F657D,112?
The B-port outputs (B0–B7) of the I74F657D,112 support a guaranteed sink current of 64 mA per pin under recommended operating conditions. This high drive strength enables direct interfacing with terminated transmission lines, multiple TTL inputs, or LED indicators without external buffers-critical for maintaining signal integrity in electrically noisy industrial backplanes.
Can the I74F657D,112 be used in systems requiring both odd and even parity schemes?
Yes-the I74F657D,112 supports both odd and even parity via the ODD/EVEN input pin. When set LOW, it configures even-parity generation and checking; when HIGH, it selects odd-parity mode. This programmability allows seamless integration into heterogeneous systems where different subsystems adhere to distinct parity conventions, eliminating need for board-level jumpers or firmware workarounds.
What is the propagation delay from A-port to B-port on the I74F657D,112?
The typical propagation delay from any A-port input (e.g., A0) to corresponding B-port output (e.g., B0) on the I74F657D,112 is 8.0 ns at VCC = 5.0 V and Tamb = 25 °C. Maximum delay across the industrial temperature range (–40 °C to +85 °C) is 9.0 ns, ensuring predictable timing margins for synchronous bus protocols operating up to 100 MHz equivalent clock rates.
I74F657D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
I74F657D,112 FAQ
1.How can I place an order for I74F657D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for I74F657D,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for I74F657D,112 reliable?
The price and inventory of I74F657D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for I74F657D,112 is usually 5 days.
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I74F657D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your I74F657D,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for I74F657D,112?
For technical support, including I74F657D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your I74F657D,112 requirements.
6.How does Aetrix verify that I74F657D,112 is sourced from the original manufacturer or authorized distributors?
All I74F657D,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that I74F657D,112 meets industry standards.
7.What is the process for return or replacement of I74F657D,112?
All I74F657D,112 units undergo pre-shipment inspection (PSI). If there is an issue with I74F657D,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The I74F657D,112 part is unused and in its original packaging.
Return procedure for I74F657D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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