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NXP Semiconductors 74ABT657D,602
- Part No.:
- 74ABT657D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT657D,602.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
74ABT657D,602 from NXP Semiconductors is an octal transceiver with integrated 8-bit parity generator/checker, non-inverting 3-state buffers, and bidirectional data flow control via T/R and OE pins. It delivers ±64 mA output drive, supports 4.5 V to 5.5 V operation, and operates across −40 °C to +85 °C for bus-oriented industrial and embedded systems.
For engineers reviewing the 74ABT657D,602 datasheet, 74ABT657D,602 pinout, 74ABT657D,602 application, or 74ABT657D,602 equivalent, this device serves as a high-speed, parity-enabled bus interface IC requiring precise direction control, error detection in receive mode, and robust drive capability for TTL/CMOS-compatible backplanes and memory subsystems.
Technical Context
The 74ABT657D,602 implements a BiCMOS architecture enabling simultaneous low static power (≤250 µA ICC in disabled state) and high-speed propagation (tPLH/tPHL ≤ 4.6 ns at 5 V). Its dual-mode parity logic-configurable via ODD/EVEN pin-generates even/odd parity during transmit (A→B) and validates parity during receive (B→A), with ERROR asserted only when mismatched parity is detected.
Direction control is strictly governed by the synchronous interaction of T/R (active-HIGH for A→B, active-LOW for B→A) and OE (active-LOW enable). The PARITY terminal functions as output in transmit mode and input in receive mode, while ERROR is exclusively an open-drain output active HIGH on parity mismatch-enabling direct wired-OR fault signaling without external pull-ups.
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 under rail tolerance. |
| Output Drive | −32 mA (HIGH), +64 mA (LOW) - supports heavy capacitive loads and fan-out to ≥20 LSTTL inputs without buffering. |
| Propagation Delay | A→B/B→A: ≤4.6 ns - enables sub-200 MHz bus clocking with deterministic timing margins. |
| Parity Function | Configurable odd/even generation & checking - provides hardware-level error detection for critical data paths like memory controllers and DMA engines. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade environments including factory automation and telecom infrastructure. |
| ESD Protection | HBM >2000 V, MM >200 V - withstands handling and board-level ESD events without latch-up or parameter shift. |
| 3-State Enable Time | tPZH ≤6.5 ns - guarantees rapid bus release for time-critical arbitration and multi-master protocols. |
Pinout & Package
74ABT657D,602 is housed in a plastic small outline package (SO24, SOT137-1) with 24 leads, 7.5 mm body width, and standard 1.27 mm lead pitch - compatible with automated SMT assembly and IPC-7351B footprint requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/R) | Transmit/Receive control input | Active-HIGH enables 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 | Input in transmit mode; 3-state output in receive mode - connects to microcontroller or CPU address/data bus. |
| 7 (VCC) | Positive supply | Primary 5 V rail connection - requires local 100 nF ceramic decoupling per device for noise suppression. |
| 11 (ODD/EVEN) | Parity configuration input | LOW selects even parity; HIGH selects odd parity - sets parity expectation for both generation and checking logic. |
| 12 (ERROR) | Error status output | Open-drain, active-HIGH signal indicating parity mismatch in receive mode - directly interfaces with interrupt controllers or fault LEDs. |
| 13 (PARITY) | Parity I/O | Output during A→B transmit; input during B→A receive - carries computed or expected parity bit for end-to-end validation. |
| 14–17, 19–23 (B0–B7) | B-port bidirectional I/O | Input in receive mode; 3-state output in transmit mode - interfaces with peripheral bus, memory module, or FPGA I/O bank. |
| 18, 19 (GND) | Ground reference | Dual ground pins reduce ground bounce and improve noise immunity in high-speed switching. |
| 24 (OE) | Output enable input | Active-LOW disables all A/B port outputs to high-impedance - essential for bus sharing and hot-swap isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated parity generator/checker | Eliminates need for discrete XOR gates and reduces PCB area by >30% versus discrete parity solutions. |
| BiCMOS process technology | Combines bipolar speed (sub-5 ns delays) with CMOS low static power (<250 µA ICC), enabling high-density bus interfaces without thermal derating. |
| Power-up 3-state | Guarantees all outputs remain high-impedance until VCC stabilizes - prevents bus contention during power sequencing. |
| Latch-up immunity | Exceeds 500 mA per JESD78B Class II Level A - ensures robustness against transient overvoltage and ground bounce. |
| High-current sinking capability | 64 mA per output supports direct driving of LEDs, optocouplers, or terminated transmission lines without external drivers. |
Applications
| Memory Subsystem Interface | Industrial Backplane Bus |
|---|---|
Use Scenario: Interfacing a microcontroller's data bus to external SRAM or EPROM with hardware parity protection. IC Role / Device Role / Timing Role: Bidirectional transceiver managing data flow direction and generating/checking parity bits on every read/write cycle. Use Value: Enables single-cycle parity validation without CPU overhead, reducing firmware complexity and improving memory reliability in safety-critical PLCs. |
Use Scenario: Connecting multiple modular I/O cards to a central controller via shared parallel backplane. IC Role / Device Role / Timing Role: Isolating and level-shifting signals between cards while detecting bus corruption via parity error flag. Use Value: Provides deterministic bus arbitration and real-time fault reporting, minimizing downtime in factory automation systems. |
| Legacy CPU Expansion Slot | DMA Controller Interface |
Use Scenario: Adding ISA or PC/104-compatible expansion capability to modern embedded designs. IC Role / Device Role / Timing Role: Translating between modern SoC buses and legacy 8-bit/16-bit expansion slots with parity support. Use Value: Extends product lifecycle by reusing certified legacy peripherals while meeting current reliability standards. |
Use Scenario: Buffering and validating data transfers between a DMA engine and peripheral FIFOs or registers. IC Role / Device Role / Timing Role: Acting as parity-aware data conduit that flags corrupted transfers before DMA completion. Use Value: Prevents silent data corruption in high-throughput streaming applications such as industrial vision or sensor fusion. |
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 |
|---|---|---|---|
| SN74ABT657N | PDIP-24 package; identical electrical specs and pinout; lacks SO24 thermal performance and SMT compatibility. | Suitable for prototyping or through-hole legacy boards; not recommended for volume production or space-constrained layouts. | Select SN74ABT657N only when manual assembly or socket-based testing is required. |
| 74LVTH16657DGGR | 16-bit, 3.3 V only, LVTH logic family; higher speed (tPD ≤ 3.2 ns), but no parity function and incompatible voltage domain. | Applicable only in 3.3 V systems where parity is handled elsewhere; requires level translation for 5 V interfacing. | Choose 74LVTH16657DGGR for high-speed 3.3 V buses without parity; avoid when parity integrity is mandatory. |
Compared with 74ABT657D,602, SN74ABT657N offers identical functionality in through-hole form but limits thermal management and density, while 74LVTH16657DGGR trades parity capability for doubled width and lower-voltage operation-making 74ABT657D,602 the sole choice for 5 V parity-protected octal bus interfaces.
Availability
74ABT657D,602 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystems, legacy CPU expansion, and DMA controller interconnects requiring stable component supply and long-term obsolescence management.
Supply support for 74ABT657D,602 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 core expertise in high-performance logic and interface ICs.
The 74ABT657D,602 belongs to NXP's ABT-series advanced BiCMOS logic family, designed specifically for high-speed, low-power, parity-enabled bus interfacing in industrial control and embedded computing systems.
FAQ
What is the function of the ODD/EVEN pin on the 74ABT657D,602?
The ODD/EVEN pin on the 74ABT657D,602 configures the parity generator/checker logic: LOW selects even parity, HIGH selects odd parity. During transmit (T/R = HIGH), it determines the logic state of the PARITY output based on the count of HIGH inputs at port A. In receive mode (T/R = LOW), it defines the expected parity for validation against the incoming PARITY signal, directly influencing ERROR assertion behavior.
How does the 74ABT657D,602 handle bus contention during power-up?
The 74ABT657D,602 features power-up 3-state functionality: all A and B port outputs remain in high-impedance state until VCC reaches valid operating range. This prevents unintended bus loading or contention during power sequencing, ensuring safe integration into systems with staggered rail ramp-up or hot-swap requirements.
Can the 74ABT657D,602 operate reliably at 4.5 V supply?
Yes, the 74ABT657D,602 is fully specified for operation from 4.5 V to 5.5 V. At 4.5 V, it maintains guaranteed output drive (IOL = 64 mA, IOH = −32 mA), propagation delay (tPLH ≤ 4.6 ns), and input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), making it suitable for margin-sensitive 5 V systems with brown-out conditions.
What is the role of the ERROR pin in receive mode for the 74ABT657D,602?
In receive mode (T/R = LOW), the ERROR pin on the 74ABT657D,602 is an open-drain output that goes HIGH only when the number of HIGH inputs on port B and the state of the PARITY input disagree with the parity setting defined by ODD/EVEN. For example, with ODD/EVEN = LOW (even parity), ERROR = HIGH indicates correct parity; ERROR = LOW signals a mismatch and potential data corruption.
Is the 74ABT657D,602 pin-compatible with other packages in the same family?
Yes, the 74ABT657D,602 (SO24/SOT137-1) shares identical pinout and functionality with 74ABT657DB (SSOP24/SOT340-1) and 74ABT657PW (TSSOP24/SOT355-1). All variants use the same 24-pin assignment, allowing direct PCB footprint substitution when thermal or mechanical constraints permit package change.
74ABT657D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- 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:
- 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,602 FAQ
1.How can I place an order for 74ABT657D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT657D,602 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,602 reliable?
The price and inventory of 74ABT657D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT657D,602 is usually 5 days.
3.What payment methods are accepted for 74ABT657D,602?
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4.How is shipping managed for 74ABT657D,602?
74ABT657D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT657D,602 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,602?
For technical support, including 74ABT657D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT657D,602 requirements.
6.How does Aetrix verify that 74ABT657D,602 is sourced from the original manufacturer or authorized distributors?
All 74ABT657D,602 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,602 meets industry standards.
7.What is the process for return or replacement of 74ABT657D,602?
All 74ABT657D,602 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT657D,602, 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,602 part is unused and in its original packaging.
Return procedure for 74ABT657D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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