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NXP Semiconductors I74F657D,118
- Part No.:
- I74F657D,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
I74F657D,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,651
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Product details
Overview
I74F657D,118 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 A/B port direction control via T/R input, OE-controlled high-impedance outputs, ODD/EVEN-selectable parity mode, and operates at 5 V ±10% over –40 °C to +85 °C.
For engineers reviewing the I74F657D,118 datasheet, I74F657D,118 pinout, I74F657D,118 application, or I74F657D,118 equivalent, key selection criteria include its dual-role parity handling (PARITY as output during transmit, input during receive), ERROR pin assertion logic, industrial temperature rating, 24-pin slim DIP (SOT137-1) package, and compatibility with FAST TTL bus loading requirements.
Technical Context
The I74F657D,118 integrates two distinct functional blocks: an octal non-inverting transceiver (A↔B ports) and a dedicated 8-bit parity generator/checker. Data flow direction is controlled by the active-HIGH T/R signal, while OE (active LOW) enables/disables all outputs into high-impedance states.
Parity operation is dynamically reconfigurable: when T/R = HIGH, PARITY outputs even/odd parity based on A-port bit count and ODD/EVEN input; when T/R = LOW, PARITY serves as input and ERROR asserts LOW upon parity mismatch on B-port data. Propagation delays are asymmetric-e.g., A→B is 8.0 ns typ, while B→ERROR requires ≥(B→A)+(A→PARITY) ≈ 22.5 ns max under industrial conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL systems and tolerates rail variation without level-shifting. |
| Operating Temperature | –40 °C to +85 °C - Qualified for industrial environments including factory automation and embedded instrumentation. |
| Propagation Delay (A→B) | 8.0 ns typical - Enables reliable timing in high-speed bus cycles up to ~100 MHz in short-trace layouts. |
| Output Drive (B ports) | Sinks 64 mA / sources 15 mA - Supports heavy bus loading and direct connection to multiple TTL inputs without buffers. |
| Input Loading (A/B ports) | 70 µA HIGH/LOW - Reduces bus capacitance impact versus standard FAST TTL (600 µA), improving signal integrity. |
| Parity Mode Control | ODD/EVEN pin selects even or odd parity generation/checking - Configurable per system protocol requirement without external logic. |
| Error Detection Output | ERROR pin asserts LOW on parity mismatch during receive - Provides immediate fault indication for error-handling firmware or hardware watchdogs. |
Pinout & Package
Package: 24-pin plastic slim DIP (300 mil), SOT137-1 footprint. Body width 7.5 mm, lead pitch 2.54 mm, compliant with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 8, 9 | A0–A7 inputs/outputs | 3-state bidirectional A-side data ports; driven by internal buffers with 24 mA sink capability. |
| 10, 11, 12, 13, 14, 15, 16, 17 | B0–B7 inputs/outputs | 3-state bidirectional B-side data ports; higher drive strength (64 mA sink) for bus termination. |
| 7 | VCC | Positive supply pin - Must be decoupled locally with 0.1 µF ceramic capacitor to minimize switching noise. |
| 18, 19 | GND | Ground reference pins - Dual GND reduces ground bounce in high-current switching events. |
| 20 | PARITY | Configurable I/O: output during transmit (T/R = HIGH), input during receive (T/R = LOW). |
| 21 | ERROR | Open-collector output asserting LOW on parity error - Requires external pull-up for logic-level compatibility. |
| 22 | ODD/EVEN | Static control input selecting even (LOW) or odd (HIGH) parity mode - Latched at T/R edge. |
| 23 | T/R | Transmit/Receive control - HIGH enables A→B data flow and PARITY generation; LOW enables B→A and PARITY checking. |
| 24 | OE | Output Enable (active LOW) - Disables all A/B/ERROR/PARITY outputs simultaneously into high-Z state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated parity generator/checker | Eliminates need for separate 74F280A and transceiver ICs, reducing board area and interconnect complexity. |
| Industrial temperature range | Validated operation from –40 °C to +85 °C supports deployment in uncontrolled industrial enclosures. |
| Low-input current (70 µA) | Reduces cumulative bus loading across 8-bit interfaces, enabling longer trace lengths and higher fan-out. |
| Asymmetric output drive | B ports deliver 64 mA sink vs. A ports' 24 mA - Optimized for driving terminated buses while minimizing source-side power dissipation. |
| Dual GND pins | Separates digital return paths to suppress ground bounce during simultaneous 8-bit switching events. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Bus Controller |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Transceiver manages address/data multiplexing; parity generator ensures ECC-free memory-mapped I/O integrity. Use Value: ERROR pin triggers immediate fault logging upon parity mismatch, preventing corrupted sensor actuation commands. |
Use Scenario: Interfacing 8-bit microprocessor data bus to external RAM or ROM chips in vintage computing systems. IC Role / Device Role / Timing Role: Buffers isolate CPU from memory load; parity checker validates read data before ALU execution. Use Value: 8.0 ns A→B delay meets tight 100 ns memory cycle timing budgets without wait-state insertion. |
| Automotive Engine Control Unit (ECU) Diagnostics Port | Avionics Data Acquisition Subsystem |
Use Scenario: Isolating diagnostic serial interface from main ECU processor bus during firmware updates. IC Role / Device Role / Timing Role: Transceiver isolates update traffic; parity generator adds checksum layer to flash programming packets. Use Value: Industrial temp rating ensures reliability in under-hood environments where ambient exceeds 70 °C. |
Use Scenario: Aggregating sensor readings from multiple analog-to-digital converters onto a shared data bus in flight control systems. IC Role / Device Role / Timing Role: Parity checker validates ADC sample integrity before transmission to central processor. Use Value: Dual GND pins minimize ground shift-induced errors during simultaneous 8-channel sampling bursts. |
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 | Commercial temperature range (0 °C to +70 °C); same pinout, AC/DC specs, and logic function. | Not qualified for extended thermal environments; unsuitable for outdoor or engine-bay deployments. | Select only for cost-sensitive lab or office equipment where ambient stays within commercial limits. |
| 74ACT657PC | Advanced CMOS (ACT) family: 5 V tolerant, lower ICC (20 mA typ), but no industrial temp option; PARITY/ERROR timing differs. | Lacks guaranteed –40 °C start-up; ERROR assertion path delay not characterized for industrial use. | Prefer for low-power, space-constrained designs where temperature is controlled and full industrial qualification is unnecessary. |
Compared with SN74F657N and 74ACT657PC, the I74F657D,118 uniquely delivers industrial temperature assurance, verified 64 mA B-port drive, and documented ERROR timing behavior across –40 °C to +85 °C - critical for deterministic fault detection in safety-relevant subsystems.
Availability
I74F657D,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer memory controllers, automotive diagnostics interfaces, and avionics data acquisition subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for I74F657D,118 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 mixed-signal ICs for automotive, industrial, and communication applications.
The 74F657 family was developed to consolidate bus transceivers and parity logic in industrial control and computing systems, addressing demand for reduced component count and deterministic error detection in mission-critical data paths.
FAQ
What is the function of the ERROR pin on the I74F657D,118?
The ERROR pin on the I74F657D,118 is an open-collector output that asserts LOW when a parity mismatch is detected during receive mode (T/R = LOW). It monitors the number of HIGH bits on B0–B7 and compares against the expected parity state set by ODD/EVEN; if inconsistent with the PARITY input, ERROR goes LOW. This behavior is fully specified in the function table and AC characteristics, with worst-case assertion time of 25.0 ns under industrial conditions. The I74F657D,118 requires an external pull-up resistor to define the HIGH state.
Does the I74F657D,118 support both even and odd parity modes?
Yes, the I74F657D,118 supports both even and odd parity modes via the ODD/EVEN input pin. When ODD/EVEN = LOW, the device generates or checks for even parity; when HIGH, it uses odd parity. This selection applies consistently during both transmit (PARITY output) and receive (PARITY input + ERROR evaluation) operations. The logic is confirmed in the function table and description sections of the Philips product data sheet, and the I74F657D,118 implements this behavior without external configuration components.
What is the maximum sink current capability of the B-port outputs on the I74F657D,118?
The B-port outputs (B0–B7) of the I74F657D,118 are rated to sink up to 64 mA each under recommended operating conditions (VCC = 4.5 V to 5.5 V, Tamb = –40 °C to +85 °C). This value is specified in the "RECOMMENDED OPERATING CONDITIONS" table and verified in DC electrical characteristics (IOL = 64 mA for B0–B7, PARITY, ERROR). The I74F657D,118 maintains this drive strength across its full industrial temperature range, enabling direct interface to terminated buses or multiple TTL loads without external drivers.
How does the I74F657D,118 handle direction control between A and B ports?
The I74F657D,118 uses the T/R (Transmit/Receive) input to control data direction: when T/R = HIGH, data flows from A ports to B ports and PARITY acts as an output; when T/R = LOW, data flows from B ports to A ports and PARITY serves as an input for parity checking. This bidirectional control is synchronized with OE (Output Enable) - both A and B ports enter high-impedance state when OE = HIGH, regardless of T/R state. The I74F657D,118 implements this behavior with guaranteed setup/hold timing relative to clockless control signals.
Is the I74F657D,118 pin-compatible with other 74F-series transceivers like the 74F245?
No, the I74F657D,118 is not pin-compatible with the 74F245. While it integrates 74F245 functionality, the I74F657D,118 includes additional pins for parity control (ODD/EVEN), parity I/O (PARITY), and error reporting (ERROR), resulting in a 24-pin layout distinct from the 20-pin 74F245. Pin mapping differs fundamentally: e.g., pins 20–24 on I74F657D,118 are PARITY, ERROR, ODD/EVEN, T/R, and OE - none of which exist on the 74F245. The I74F657D,118 requires its specific SOT137-1 footprint and cannot substitute directly without PCB redesign.
I74F657D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,118 FAQ
1.How can I place an order for I74F657D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for I74F657D,118 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,118 reliable?
The price and inventory of I74F657D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for I74F657D,118 is usually 5 days.
3.What payment methods are accepted for I74F657D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for I74F657D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for I74F657D,118?
I74F657D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your I74F657D,118 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,118?
For technical support, including I74F657D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your I74F657D,118 requirements.
6.How does Aetrix verify that I74F657D,118 is sourced from the original manufacturer or authorized distributors?
All I74F657D,118 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,118 meets industry standards.
7.What is the process for return or replacement of I74F657D,118?
All I74F657D,118 units undergo pre-shipment inspection (PSI). If there is an issue with I74F657D,118, 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,118 part is unused and in its original packaging.
Return procedure for I74F657D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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