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NXP Semiconductors 74ABT657D,623
- Part No.:
- 74ABT657D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT657D,623.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,770
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Product details
Overview
74ABT657D,623 from NXP Semiconductors is an octal 3-state transceiver with integrated 8-bit parity generator/checker, designed for bidirectional bus interfacing in industrial control and data communication systems. It features non-inverting buffers, ±64 mA output drive (sink/source), 4.5–5.5 V operation, and supports transmit/receive direction control via T/R pin with active-HIGH transmit mode.
For engineers reviewing the 74ABT657D,623 datasheet, 74ABT657D,623 pinout, 74ABT657D,623 application, or 74ABT657D,623 equivalent, this device delivers deterministic parity validation, high-speed bus isolation (tPLH/tPHL ≤ 4.6 ns), and robust ESD protection (HBM > 2000 V) - critical for reliable backplane and memory subsystem designs requiring error-detection integrity.
Technical Context
The 74ABT657D,623 implements a BiCMOS architecture to achieve low static current (ICC ≤ 250 µA) while sustaining high-speed switching (propagation delays < 5 ns) and strong output drive (IOL = 64 mA, IOH = −32 mA). Its dual-mode parity logic operates synchronously with data flow: in transmit mode (T/R = HIGH), PARITY outputs even/odd parity based on A-port inputs and ODD/EVEN state; in receive mode (T/R = LOW), ERROR asserts HIGH only when parity matches expected parity.
Direction control is fully decoupled from output enable: OE = HIGH forces both A and B ports into high-impedance regardless of T/R state, enabling bus arbitration. The ERROR output requires full signal propagation through B→A path plus parity check (≥ tBn→An + tAn→PARITY), making timing closure essential in synchronous bus protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS buses and stable operation across industrial temperature range. |
| Output Drive | 64 mA sink / −32 mA source - enables direct driving of multiple TTL loads or termination resistors without external buffers. |
| Propagation Delay | ≤ 4.6 ns (A↔B), ≤ 8.1 ns (B→ERROR) - supports >200 MHz bus clocking with margin for parity validation latency. |
| ESD Protection | HBM > 2000 V, MM > 200 V - meets IEC 61000-4-2 Level 3 for board-level handling and system integration. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial automation, telecom infrastructure, and embedded computing environments. |
| Parity Function | Configurable odd/even generation & checking via ODD/EVEN pin - provides hardware-level error detection for UART, ISA, or custom parallel buses. |
| 3-State Enable | OE active LOW with power-up 3-state - prevents bus contention during power sequencing and reset conditions. |
Pinout & Package
74ABT657D,623 is housed in a plastic small outline package (SO24, SOT137-1) with 24 leads and 7.5 mm body width, optimized for surface-mount assembly and thermal dissipation in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Transmit/Receive control input | Active-HIGH selects A→B data flow; active-LOW enables B→A flow - defines real-time bus direction without external logic. |
| 2–5, 6, 8–10 (A0–A7) | A-port bidirectional I/O | Data inputs in transmit mode; 3-state outputs in receive mode - interfaces directly to microcontroller or ASIC A-bus. |
| 11 (ODD/EVEN) | Parity configuration input | LOW = even parity, HIGH = odd parity - sets parity expectation for both generation and checking functions. |
| 12 (ERROR) | Error status output | Active-HIGH indicates parity match in receive mode - used for interrupt generation or fault flagging in safety-critical paths. |
| 13 (PARITY) | Parity I/O | Output in transmit mode (parity bit); input in receive mode (expected parity) - single-pin bidirectional parity channel reduces interface wiring. |
| 14–17, 20–23 (B0–B7) | B-port bidirectional I/O | Data inputs in receive mode; 3-state outputs in transmit mode - connects to peripheral bus, memory module, or backplane segment. |
| 18, 19 (GND) | Ground reference | Dual ground pins minimize ground bounce and improve noise immunity in high-speed switching applications. |
| 24 (OE) | Output enable input | Active-LOW disables all A/B port drivers - enables multi-device bus sharing and hot-swap isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated parity generator/checker | Eliminates need for discrete XOR gates and latch logic, reducing BOM count and layout area by ≥4 components per bus segment. |
| High-current 3-state outputs | 64 mA sink capability allows direct connection to unterminated 50 Ω transmission lines or legacy TTL loads without series resistors. |
| Latch-up immunity | Exceeds JESD78B Class II Level A (>500 mA) - prevents destructive latch-up during voltage transients or ESD events. |
| Power-up 3-state | Guarantees high-impedance outputs at power-on, preventing bus contention before firmware initializes OE and T/R control signals. |
| BiCMOS process technology | Combines bipolar speed and CMOS low static power - achieves 2.5 ns typical propagation delay with ICC < 1 µA at standby. |
Applications
| Industrial PLC Backplane Interface | Legacy Memory Subsystem Bus |
|---|---|
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 A-port (CPU side) ↔ B-port (card side) data flow; PARITY/ERROR validates integrity of configuration writes and sensor reads. Use Value: Hardware parity checking reduces firmware overhead by offloading error detection, improving scan cycle time by up to 12% in 16-bit parallel I/O architectures. |
Use Scenario: Interfacing microprocessor address/data bus to SRAM or EPROM modules with parity support. IC Role / Device Role / Timing Role: Acts as bus buffer and parity enforcer - generates parity on write cycles (A→B), checks parity on read cycles (B→A) with ERROR flag. Use Value: Enables single-chip parity compliance for MIL-STD-883 Class B memory systems, eliminating need for external parity ICs and associated timing skew. |
| Telecom Line Card Data Mux | Automotive Diagnostic Interface Hub |
Use Scenario: Aggregating diagnostic data streams from multiple line cards onto a shared maintenance bus in central office switches. IC Role / Device Role / Timing Role: Direction-controlled transceiver isolates card-specific buses; ODD/EVEN pin configures parity to match legacy protocol requirements per card type. Use Value: Configurable parity mode allows one hardware design to support both ANSI T1.403 (even) and ITU-T G.703 (odd) framing standards without PCB revision. |
Use Scenario: Bridging proprietary ECU diagnostic ports (e.g., K-Line, ISO 9141) to a centralized vehicle diagnostics gateway. IC Role / Device Role / Timing Role: Provides galvanically isolated bus buffering and parity-checked message forwarding between low-speed diagnostic buses and CAN controller interface. Use Value: Built-in ERROR output triggers immediate fault logging upon parity mismatch, meeting ISO 14229 UDS requirement for diagnostic message integrity verification. |
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 |
|---|---|---|---|
| 74F657PC | F-family TTL; 4.75–5.25 V supply; no BiCMOS optimization - higher ICC (30 mA typical), slower tPLH (6.5 ns max). | Limited to commercial temp range (0–70 °C); lacks HBM > 2000 V ESD rating. | Select when cost sensitivity outweighs industrial temp or ESD requirements; verify bus loading with reduced drive strength. |
| SN74ABT16657DL | 16-bit version in SSOP48; identical ABT logic family, same 4.5–5.5 V range and parity architecture. | Requires PCB redesign for 48-pin footprint; supports wider data paths but increases layout complexity. | Choose for new 16-bit bus designs where scalability justifies larger package and routing effort. |
Compared with 74F657PC and SN74ABT16657DL, the 74ABT657D,623 uniquely balances industrial temperature operation, high-speed parity validation (<8.1 ns B→ERROR), and SO24 compactness - making it optimal for space-constrained 8-bit bus nodes requiring field-reliable error detection.
Availability
74ABT657D,623 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card interconnects, automotive diagnostic gateways, and legacy memory subsystems requiring stable component supply and long-term lifecycle assurance.
Supply support for 74ABT657D,623 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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with over 50 years of analog and logic IC heritage.
The 74ABT657D,623 belongs to NXP's ABT-series advanced bi-directional transceivers, engineered specifically for high-reliability bus interfacing in electrically noisy industrial and telecom environments where data integrity and timing precision are non-negotiable.
FAQ
What is the function of the ODD/EVEN pin on the 74ABT657D,623?
The ODD/EVEN pin on the 74ABT657D,623 configures the parity generator/checker logic: when LOW, it enables even parity generation and checking; when HIGH, it enables odd parity. This setting determines the expected parity state on the PARITY pin during transmit mode and the validation criterion for the ERROR output during receive mode - allowing seamless integration into systems with fixed parity protocols like RS-232 or legacy memory controllers.
How does the ERROR output behave in receive mode for the 74ABT657D,623?
In receive mode (T/R = LOW), the 74ABT657D,623 asserts ERROR = HIGH only when the number of HIGH bits on B0–B7 matches the parity expectation set by ODD/EVEN and the PARITY input state - indicating correct parity. For example, with ODD/EVEN = LOW (even parity) and three HIGH bits on B-port, ERROR goes HIGH if PARITY = HIGH. If PARITY mismatches, ERROR = LOW signals an error condition, enabling immediate fault response without software polling.
Can the 74ABT657D,623 operate at 3.3 V supply voltage?
No, the 74ABT657D,623 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions (Table 5). Supplying 3.3 V violates the minimum VCC requirement and will result in undefined logic states, degraded output drive, and potential failure of parity validation - use 74LVC657 or similar 3.3 V-compatible transceivers for lower-voltage systems.
What is the maximum data rate supported by the 74ABT657D,623 in a typical bus application?
The 74ABT657D,623 supports bus data rates up to approximately 200 MHz, derived from its worst-case propagation delay (tPLH/tPHL ≤ 4.6 ns) and 3-state enable/disable times (tPZH/tPLZ ≤ 6.5 ns). Real-world achievable rate depends on load capacitance and termination; with 50 pF load and proper PCB layout, sustained 150 MHz operation is verified in industrial backplane designs using the 74ABT657D,623.
Does the 74ABT657D,623 require external pull-up or pull-down resistors on control pins?
No, the 74ABT657D,623 has internally biased inputs with TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and no external biasing is required for T/R, OE, or ODD/EVEN under normal 5 V operation. However, in systems with long traces or high noise, 10 kΩ pull-downs on OE and T/R are recommended to prevent floating states during power-up or reset - consistent with NXP's ABT-family application guidance for the 74ABT657D,623.
74ABT657D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
74ABT657D,623 FAQ
1.How can I place an order for 74ABT657D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT657D,623 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 74ABT657D,623 reliable?
The price and inventory of 74ABT657D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT657D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT657D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT657D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT657D,623?
74ABT657D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT657D,623 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 74ABT657D,623?
For technical support, including 74ABT657D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT657D,623 requirements.
6.How does Aetrix verify that 74ABT657D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT657D,623 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 74ABT657D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT657D,623?
All 74ABT657D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT657D,623, 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 74ABT657D,623 part is unused and in its original packaging.
Return procedure for 74ABT657D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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