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Texas Instruments SN74ABT657ANT
- Part No.:
- SN74ABT657ANT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT657ANT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
SN74ABT657ANT from Texas Instruments is an octal transceiver with integrated parity generator/checker and 3-state outputs, operating at 4.5–5.5 V, supporting bidirectional data flow between A and B ports with selectable odd/even parity, and delivering ±32-mA high-drive outputs for robust bus interfacing in industrial control backplanes.
For engineers reviewing the SN74ABT657ANT datasheet, SN74ABT657ANT pinout, SN74ABT657ANT application, or SN74ABT657ANT equivalent, key selection criteria include its 24-pin PDIP (NT) package, T/R-controlled directionality, OE-gated 3-state operation, PARITY/ERR signaling for error detection, and compatibility with TTL-level logic systems requiring parity-checked data integrity.
Technical Context
This BiCMOS transceiver implements a flow-through architecture with noninverting buffers and dedicated parity logic: ODD/EVEN selects parity sense, PARITY outputs generated parity in transmit mode and serves as input in receive mode, while ERR asserts low on parity mismatch. The device maintains high-impedance state during power-up/down when VCC is below 2.1 V.
It supports full 8-bit bidirectional data transfer with independent control of direction (T/R) and output enable (OE), features latch-up immunity exceeding 500 mA per JESD-17, ESD protection >2000 V (MIL-STD-883), and output drive capability of –32 mA IOH / 64 mA IOL at VCC = 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS bus systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and control applications |
| Output Drive | –32 mA IOH / 64 mA IOL - enables direct driving of heavily loaded buses without external buffers |
| Propagation Delay | 1 ns to 5 ns (A↔B) - supports high-speed synchronous data transfer up to ~100 MHz system timing |
| Parity Function | Configurable odd/even generation and checking - provides hardware-level data integrity verification for critical communication paths |
| 3-State Enable Time | tPZH = 1.4 ns (min), tPZL = 1.7 ns (min) - ensures fast bus release and minimizes contention windows |
| Input Leakage | ±20 µA (A/B ports) - guarantees stable logic levels with high-impedance termination or pull-up/pull-down networks |
Pinout & Package
SN74ABT657ANT is housed in a 24-pin plastic dual in-line package (PDIP-NT), with 0.600-inch body width and through-hole mounting. Pin 1 is located at top-left corner (notch side left), and all pins are gold-plated leads rated for wave/soldering reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (A port) | Noninverting bidirectional I/O lines connected to local subsystem bus; high-impedance when OE = high |
| B1–B8 | Data inputs/outputs (B port) | Noninverting bidirectional I/O lines connected to remote or backplane bus; direction set by T/R |
| T/R | Transmit/Receive control | High = A→B data flow; Low = B→A data flow - determines active signal path through internal logic |
| OE | Output enable | High = both A and B ports enter high-impedance state - essential for bus arbitration and multi-drop sharing |
| ODD/EVEN | Parity mode select | Low = even parity; High = odd parity - configures parity generator/checker behavior before data transfer |
| PARITY | Parity bit I/O | Output in transmit mode (generated parity); input in receive mode (expected parity value) |
| ERR | Error flag output | Active-low open-drain output asserting low when received data fails parity check |
| VCC, GND | Power supply | Single 5-V supply with two ground pins (pins 12 and 13) - reduces ground bounce and improves noise margin |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS EPIC-IIB process | Reduces dynamic power dissipation vs. standard bipolar TTL while retaining high noise immunity and speed |
| Flow-through pinout | Minimizes PCB trace length and crosstalk - A1–A8 and B1–B8 aligned for straight-layer routing across bus connectors |
| Power-up/down high-Z | Guarantees bus isolation during supply ramping - prevents glitches or contention when VCC < 2.1 V |
| Output ground bounce < 1 V | Ensures clean signal integrity under heavy switching loads - critical for reliable multi-bit parallel transfers |
| Latch-up immunity > 500 mA | Meets JEDEC JESD-17 - protects against destructive current surges during transient overvoltage events |
Applications
| Industrial Backplane Interface | Legacy System Data Bridge |
|---|---|
Use Scenario: Interfacing microcontroller-based I/O modules to a centralized PLC backplane with parity-protected address/data bus. IC Role / Device Role / Timing Role: Bidirectional octal transceiver providing direction-controlled data coupling and real-time parity validation between local and backplane domains. Use Value: Eliminates need for discrete parity logic and bus buffers, reducing component count and board area while ensuring error-detectable communication per IEC 61131-3 requirements. |
Use Scenario: Connecting modern FPGA-based controllers to aging 8-bit ISA-compatible peripheral cards requiring parity-checked data exchange. IC Role / Device Role / Timing Role: Level-shifting and protocol-adapting transceiver that translates between contemporary logic families and legacy TTL bus timing with parity enforcement. Use Value: Enables drop-in replacement of obsolete 74F657-style devices with enhanced drive strength and lower power, preserving existing firmware and timing margins. |
| Test Equipment Bus Controller | Avionics Maintenance Interface |
Use Scenario: Managing parallel data flow between test head digital pattern generators and DUT interface boards in automated test systems. IC Role / Device Role / Timing Role: High-reliability bus transceiver with deterministic propagation delay and parity error reporting for fault-isolation diagnostics. Use Value: Provides hardware-level error detection on every data word transferred, enabling immediate identification of cable faults, connector issues, or DUT response corruption. |
Use Scenario: Supporting maintenance data link between portable diagnostic tools and aircraft subsystems using MIL-STD-1553 auxiliary parallel interfaces. IC Role / Device Role / Timing Role: Ruggedized parity-aware transceiver handling bidirectional configuration and status register access under wide temperature and EMI conditions. Use Value: Meets DO-160 Section 20 radiated emissions and lightning-induced transient requirements via inherent ESD/latch-up robustness and ground-bounce suppression. |
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 |
|---|---|---|---|
| SN74ABT657ADW | SOIC-24 package (surface-mount), identical electrical specs and pinout mapping | Designed for automated SMT assembly; lacks through-hole mechanical retention | Select when PCB space constraints or production line automation require surface-mount packaging |
| SN74ABT657ADBR | SSOP-24 package (0.209" width), same functionality but smaller footprint and higher density | Used in compact instrumentation where board real estate is limited; requires fine-pitch soldering | Choose for space-constrained designs needing same performance in reduced volume, with compatible thermal profile |
Compared with SN74ABT657ANT, the DW and DBR variants offer identical logic function, timing, and drive strength but differ in mechanical form factor and assembly method - NT enables manual prototyping and high-vibration environments, while DW and DBR support high-volume automated manufacturing and miniaturized layouts.
Availability
SN74ABT657ANT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, and test equipment bus controllers requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for SN74ABT657ANT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface ICs.
The ABT logic family, including SN74ABT657ANT, was engineered for industrial and military-grade applications demanding robust 5-V bus interfacing, parity-checked data integrity, and superior noise immunity in harsh electromagnetic environments.
FAQ
What is the primary function of the SN74ABT657ANT in a data bus system?
The SN74ABT657ANT functions as an octal bidirectional transceiver with integrated parity generation and checking. It routes 8-bit data between two buses (A and B ports) under T/R control, generates or validates parity bits via ODD/EVEN and PARITY signals, and asserts ERR on parity mismatch - enabling hardware-level data integrity verification without software overhead in the SN74ABT657ANT implementation.
Does the SN74ABT657ANT support hot insertion or live bus swapping?
The SN74ABT657ANT provides high-impedance state during power-up and power-down when VCC is below 2.1 V, but it does not include dedicated hot-swap circuitry such as slew-rate control or undervoltage lockout. For safe live insertion, OE must be held high until VCC stabilizes above 2.1 V and system clocks are settled - this behavior is explicitly defined in the SN74ABT657ANT datasheet's power sequencing guidelines.
Can the SN74ABT657ANT operate with a 3.3-V supply?
No, the SN74ABT657ANT is specified only for 4.5 V to 5.5 V operation per its recommended operating conditions. Its BiCMOS EPIC-IIB process and input thresholds are optimized for 5-V TTL compatibility; applying 3.3 V may result in undefined logic states, insufficient noise margin, or failure to meet VOL/VOH specifications - this limitation applies strictly to the SN74ABT657ANT and is not mitigated by external biasing.
How is parity checked in receive mode on the SN74ABT657ANT?
In receive mode (T/R = low), the SN74ABT657ANT samples all eight B-port bits plus the PARITY input, counts high bits, and compares the total count against the parity sense selected by ODD/EVEN. If the count violates the expected odd/even condition, ERR is driven low. This real-time hardware check occurs independently of external logic and is fully documented in the SN74ABT657ANT function table and logic diagram.
What package type does SN74ABT657ANT use, and is it RoHS-compliant?
SN74ABT657ANT uses a 24-pin plastic dual in-line package (PDIP-NT) with through-hole mounting. Per Texas Instruments' official packaging documentation, this variant carries RoHS-compliant lead finish (NIPDAU) and meets exemption category 7a for lead in high-melting-temperature solder - full compliance status and MSL rating (Level-1-260°C-UNLIM) are confirmed for the SN74ABT657ANT orderable part number.
SN74ABT657ANT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT657ANT FAQ
1.How can I place an order for SN74ABT657ANT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT657ANT 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 SN74ABT657ANT reliable?
The price and inventory of SN74ABT657ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT657ANT is usually 5 days.
3.What payment methods are accepted for SN74ABT657ANT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT657ANT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT657ANT?
SN74ABT657ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT657ANT 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 SN74ABT657ANT?
For technical support, including SN74ABT657ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT657ANT requirements.
6.How does Aetrix verify that SN74ABT657ANT is sourced from the original manufacturer or authorized distributors?
All SN74ABT657ANT 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 SN74ABT657ANT meets industry standards.
7.What is the process for return or replacement of SN74ABT657ANT?
All SN74ABT657ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT657ANT, 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 SN74ABT657ANT part is unused and in its original packaging.
Return procedure for SN74ABT657ANT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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