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NXP Semiconductors I74F657N,112
- Part No.:
- I74F657N,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
I74F657N,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,495
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Product details
Overview
I74F657N,112 from Philips Semiconductors is an octal transceiver with integrated 8-bit parity generator/checker in a 24-pin plastic slim DIP (300 mil) package, operating over –40 °C to +85 °C. It provides bidirectional data flow between A and B ports, 3-state outputs, and real-time parity validation for error detection in industrial bus systems.
For engineers reviewing the I74F657N,112 datasheet, I74F657N,112 pinout, I74F657N,112 application, or I74F657N,112 equivalent, key selection criteria include its 8.0 ns typical propagation delay, ±15 mA B-port sourcing capability, 64 mA B-port sinking, ODD/EVEN-selectable parity mode, and ERROR output assertion timing dependent on B-to-A and A-to-PARITY delays.
Technical Context
The I74F657N,112 integrates two core functions: an octal non-inverting 3-state transceiver (A↔B direction controlled by T/R) and an independent 8-bit parity generator/checker. Its dual-mode operation-transmit (T/R = HIGH) generates parity from A-port data; receive (T/R = LOW) validates parity against B-port data and asserts ERROR on mismatch-enables end-to-end bus integrity checking without external logic.
It uses TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), supports 5.0 V ±10% supply, and delivers guaranteed drive strength: 24 mA sink at A ports, 64 mA sink at B ports, and 15 mA source at B ports, PARITY, and ERROR outputs. Input loading is reduced to 70 µA (HIGH/LOW) on A/B/Parity pins versus standard FAST ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL bus systems and margin against rail droop. |
| Propagation Delay (A→B) | Max 8.0 ns at Tamb = –40 °C to +85 °C - enables high-speed synchronous bus transfers up to ~125 MHz clock-equivalent rates. |
| B-Port Output Drive | Sinks 64 mA / sources 15 mA - directly drives multiple TTL loads or terminates stubbed bus segments without external buffers. |
| Input Loading (A0–A7, B0–B7) | 70 µA in HIGH and LOW states - reduces bus capacitance loading and signal integrity degradation in multi-drop configurations. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control, instrumentation, and factory automation environments. |
| Parity Mode Control | ODD/EVEN pin selects even or odd parity generation/checking - allows system-level protocol alignment without firmware or logic changes. |
| ERROR Output Assertion | Valid only after (B→A delay) + (A→PARITY delay) ≥ 15.5 ns min - defines minimum setup time for downstream error-handling circuitry. |
Pinout & Package
Package: 24-pin plastic slim DIP (300 mil), SOT222-1, with VCC on pin 7 and GND on pins 18 and 19.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Output Enable (active LOW) | Disables all A and B port outputs into high-impedance state - essential for bus arbitration and multi-master contention avoidance. |
| ERROR (Pin 2) | Error Flag Output | Active HIGH when received B-port data + PARITY input violates selected ODD/EVEN rule - enables immediate fault interrupt or retry logic. |
| ODD/EVEN (Pin 3) | Parity Mode Select | LOW = even parity, HIGH = odd parity - configures both generator and checker behavior in hardware, eliminating software overhead. |
| T/R (Pin 4) | Transmit/Receive Control | HIGH = A→B data flow + PARITY generation; LOW = B→A data flow + PARITY checking - single-pin bidirectional bus direction control. |
| B0–B7 (Pins 5–12) | B-Port Inputs/Outputs | 3-state bidirectional I/O with 64 mA sink capability - connects to main system data bus; driven by or drives external controllers/peripherals. |
| A0–A7 (Pins 13–20) | A-Port Inputs/Outputs | 3-state bidirectional I/O with 24 mA sink capability - typically interfaces to local processor or ASIC; lower drive suits point-to-point links. |
| VCC (Pin 21) | Positive Supply | +5 V power rail - decoupling required within 10 mm of pin per fast-switching current demands. |
| A5–A7 (Pins 22–24) | A-Port Continuation | Completes full 8-bit A port; pin 24 is PARITY - ensures contiguous 8-bit layout for PCB routing efficiency. |
| PARITY (Pin 24) | Parity I/O | Output during transmit (T/R = HIGH); input during receive (T/R = LOW) - shared pin reduces package count while maintaining full parity handshake. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 74F245 + 74F280A functionality | Eliminates need for separate transceiver and parity ICs - reduces board area, BOM count, and interconnect skew in space-constrained industrial modules. |
| 70 µA input loading on A/B/Parity pins | Enables >30-unit fan-out on shared buses without signal degradation - critical for legacy backplane and rack-mounted controller designs. |
| 64 mA B-port sink capability | Drives terminated 50 Ω transmission lines or multiple TTL inputs directly - avoids external line drivers in deterministic real-time control loops. |
| Hardware-selectable ODD/EVEN parity | Allows field-upgradable protocol compliance (e.g., Modbus RTU vs. custom firmware) via single jumper or GPIO, not code reflash. |
| ERROR output timing referenced to B→A + A→PARITY paths | Provides deterministic, cycle-accurate fault detection window - enables synchronous error capture in FPGA-based bus monitors without added latency. |
Applications
| Industrial Backplane Bus | Legacy PLC I/O Module |
|---|---|
Use Scenario: Data exchange between CPU card and distributed I/O cards across a 24-bit parallel backplane operating at 10 MHz. IC Role / Device Role / Timing Role: I74F657N,112 acts as bus transceiver and real-time parity validator on each I/O card, ensuring bit integrity across 300-mil DIP-mounted connectors subject to vibration-induced contact noise. Use Value: Detects single-bit errors induced by EMI or connector fretting before data reaches the PLC scan cycle - prevents spurious actuator commands or sensor misreads. |
Use Scenario: Isolating and conditioning signals between a microcontroller and 8-channel digital input bank in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: I74F657N,112 serves as level-shifting, load-reducing interface with parity-checked data path from optocoupler outputs to MCU data bus. Use Value: 70 µA input loading minimizes current draw from optocoupler LEDs; ERROR output triggers immediate diagnostic LED flash without CPU polling overhead. |
| Military Avionics Data Link | Test Equipment Digital Pattern Generator |
Use Scenario: Bidirectional data transfer between flight computer and sensor acquisition unit in a MIL-STD-1553B auxiliary bus interface module. IC Role / Device Role / Timing Role: I74F657N,112 implements deterministic parity-checked handshaking between dual-redundant processors, with ERROR flag feeding watchdog timer reset logic. Use Value: 8.0 ns max A→B delay and guaranteed 64 mA sink ensure timing closure in <100 ns response-critical fault isolation sequences. |
Use Scenario: Generating and verifying known-good 8-bit test vectors on a boundary-scan compatible digital test fixture with built-in error injection capability. IC Role / Device Role / Timing Role: I74F657N,112 operates in loopback mode (T/R = HIGH, OE = LOW) with PARITY monitored to validate vector integrity before applying to DUT. Use Value: Hardware parity generation eliminates software checksum latency; ERROR output flags corrupted vectors in real time for automatic retransmission. |
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 | Same pinout, identical AC/DC specs, but manufactured by Texas Instruments under second-source agreement; no industrial temperature grade offered. | Limited to 0 °C to +70 °C commercial range - unsuitable for extended-temperature industrial deployments where I74F657N,112 is specified. | Select SN74F657N only for cost-sensitive commercial equipment with ambient-controlled enclosures. |
| 74ACT657PC | Higher speed (tPD = 5.5 ns typ), 3.3 V tolerant inputs, but requires 5 V supply; no industrial temp rating; different pinout (SOIC-24). | Not drop-in replaceable due to SOIC package and altered pin mapping; lacks guaranteed 64 mA B-port sink at industrial temps. | Choose 74ACT657PC only when upgrading legacy designs to higher throughput and mixed-voltage interfacing is required - redesign PCB layout and verify thermal derating. |
Compared with SN74F657N and 74ACT657PC, the I74F657N,112 uniquely combines industrial temperature qualification, 24-pin DIP packaging for through-hole reliability, and guaranteed 64 mA B-port sink in a single device - making it the sole option for ruggedized, maintenance-intensive, or long-lifecycle industrial control hardware.
Availability
I74F657N,112 is available at Aetrix Electronics and suitable for industrial backplane buses, legacy PLC I/O modules, military avionics data links, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for I74F657N,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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator with leadership in logic, analog, and interface solutions for industrial and automotive markets.
The 74F657 family was designed specifically for high-reliability, bus-oriented systems requiring concurrent data transfer and hardware-level error detection - targeting industrial control, instrumentation, and defense electronics where firmware-based parity is unacceptable due to latency or safety certification constraints.
FAQ
What is the maximum operating temperature range supported by the I74F657N,112?
The I74F657N,112 is rated for industrial temperature operation from –40 °C to +85 °C, as confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the Philips product data sheet. This range is validated for continuous operation and applies to all electrical specifications including propagation delay, drive strength, and input thresholds. The I74F657N,112 achieves this via process and packaging optimizations distinct from the commercial-grade N74F657N variant.
How does the ERROR output behave during parity checking in receive mode?
In receive mode (T/R = LOW), the I74F657N,112 samples B0–B7 and the PARITY input simultaneously. If the number of HIGH bits on B0–B7 matches the expected parity (even or odd, per ODD/EVEN setting), ERROR remains LOW. If mismatched, ERROR goes HIGH within tPLH/tPHL ≤ 25.0 ns (max). Valid ERROR assertion requires total delay ≥ (B→A) + (A→PARITY) ≥ 15.5 ns min - this timing constraint must be respected in downstream logic design.
Can the I74F657N,112 be used with 3.3 V logic interfaces?
No, the I74F657N,112 is a 5 V TTL-family device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, and is not 3.3 V tolerant. Driving its inputs from 3.3 V logic may result in marginal HIGH-level recognition or increased static current. Interfacing with 3.3 V systems requires level-shifting buffers or voltage translators; the I74F657N,112 itself must be powered from a stable 5.0 V ±10% supply.
What is the purpose of the PARITY pin being bidirectional on the I74F657N,112?
The PARITY pin on the I74F657N,112 serves dual roles: output during transmit (T/R = HIGH), delivering generated parity bits; input during receive (T/R = LOW), accepting external parity for validation. This bidirectional use reduces pin count and simplifies PCB routing while maintaining full parity handshake capability - a key design choice enabling integration of transceiver and parity functions in a single 24-pin DIP package.
Is the I74F657N,112 pin-compatible with other 74F-series transceivers like the 74F245?
No, the I74F657N,112 is not pin-compatible with the 74F245. While it incorporates functional equivalence to the 74F245 plus the 74F280A, its 24-pin DIP pinout includes dedicated ODD/EVEN, T/R, ERROR, and bidirectional PARITY pins absent in the 20-pin 74F245. Direct replacement would require PCB redesign; the I74F657N,112 is intended as a system-level integration solution, not a drop-in upgrade.
I74F657N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
I74F657N,112 FAQ
1.How can I place an order for I74F657N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for I74F657N,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 I74F657N,112 reliable?
The price and inventory of I74F657N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for I74F657N,112 is usually 5 days.
3.What payment methods are accepted for I74F657N,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for I74F657N,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for I74F657N,112?
I74F657N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your I74F657N,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 I74F657N,112?
For technical support, including I74F657N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your I74F657N,112 requirements.
6.How does Aetrix verify that I74F657N,112 is sourced from the original manufacturer or authorized distributors?
All I74F657N,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 I74F657N,112 meets industry standards.
7.What is the process for return or replacement of I74F657N,112?
All I74F657N,112 units undergo pre-shipment inspection (PSI). If there is an issue with I74F657N,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 I74F657N,112 part is unused and in its original packaging.
Return procedure for I74F657N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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