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NXP Semiconductors 74ABT657DB,112
- Part No.:
- 74ABT657DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT657DB,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
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Product details
Overview
74ABT657DB,112 from NXP Semiconductors is an octal bidirectional transceiver with integrated 8-bit parity generator/checker and 3-state outputs, designed for high-speed bus interfacing in industrial control and data communication systems. It delivers 64 mA sink drive, supports 5 V operation, features transmit/receive direction control (T/R), output enable (OE), and selectable odd/even parity via ODD/EVEN pin.
For engineers reviewing the 74ABT657DB,112 datasheet, 74ABT657DB,112 pinout, 74ABT657DB,112 application, or 74ABT657DB,112 equivalent, this device serves as a bus-oriented logic interface requiring precise parity validation, robust drive capability, and deterministic 3-state timing in synchronous data transfer architectures.
Technical Context
The 74ABT657DB,112 implements BiCMOS logic to achieve high-speed propagation (typ. 2.5–5.1 ns for A→B, A→PARITY) while maintaining low static current (≤250 µA) and high noise immunity. Its dual-mode parity engine operates synchronously with data flow: in transmit mode (T/R = HIGH), it computes parity across A0–A7 and drives PARITY; in receive mode (T/R = LOW), it validates B0–B7 against incoming PARITY and asserts ERROR on mismatch.
Direction control is fully static: T/R and OE are level-sensitive inputs with no internal latching. The device includes power-up 3-state behavior, latch-up protection (>500 mA per JESD78B Class II), and ESD robustness (HBM >2000 V, MM >200 V), enabling reliable operation in electrically noisy environments without external protection circuitry.
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 bus systems and stable operation across industrial temperature range. |
| Output Drive | −32 mA (source), +64 mA (sink) - enables direct driving of heavy capacitive loads or multiple TTL inputs without buffers. |
| Propagation Delay | A→B: typ. 2.5 ns @ 5 V - supports >200 MHz bus clocking with tight timing margins in high-throughput data paths. |
| Parity Function | Configurable odd/even generation & checking - provides hardware-level error detection for serial/parallel bus integrity verification. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded systems including programmable logic controllers and backplane interfaces. |
| ESD Protection | HBM >2000 V, MM >200 V - eliminates need for external ESD diodes in board-level design, reducing BOM count and layout area. |
| 3-State Enable Time | tPZH/tPLZ ≤ 6.5 ns - guarantees fast bus release for time-critical arbitration protocols like shared memory access or DMA handshaking. |
Pinout & Package
74ABT657DB,112 uses SSOP24 (SOT340-1) package: plastic shrink small outline, 24 leads, 5.3 mm body width, 0.65 mm lead pitch, gull-wing leads.
| 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 clock or state machine. |
| 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/data bus side A with full drive/sink capability. |
| 7 (VCC) | Positive supply | 5 V nominal rail - powers all internal logic and output drivers; requires local 100 nF decoupling per datasheet recommendation. |
| 11 (ODD/EVEN) | Parity mode select | LOW = even parity, HIGH = odd parity - configures parity generator/checker behavior before data transfer begins. |
| 12 (ERROR) | Error status output | Active-HIGH indicates parity mismatch during receive mode - provides immediate fault flag for system-level error handling or retry logic. |
| 13 (PARITY) | Parity I/O | Output in transmit mode (computed parity); input in receive mode (expected parity) - single-pin bidirectional parity channel reduces interconnect count. |
| 14–17, 15, 16, 20–23 (B0–B7) | B-port bidirectional I/O | Input in receive mode; 3-state output in transmit mode - interfaces to peripheral/bus side B with identical electrical specs as A-port. |
| 18, 19 (GND) | Ground reference | Dual ground pins minimize ground bounce and improve signal integrity for high-speed switching across all 16 data lines. |
| 24 (OE) | Output enable input | Active-LOW disables both A and B ports into high-impedance - enables multi-drop bus sharing and hot-swap isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated parity generator/checker | Eliminates need for external XOR networks or FPGA logic resources, reducing gate count and routing complexity in parity-enabled systems. |
| BiCMOS process technology | Combines bipolar speed and CMOS low static power - achieves <5 ns propagation with <250 µA ICC in standby, critical for thermally constrained enclosures. |
| Power-up 3-state | Guarantees high-impedance outputs at power-on reset - prevents bus contention during system initialization without external pull-ups or sequencers. |
| Latch-up immunity | Exceeds 500 mA per JESD78B Class II - withstands transient overcurrent events common in industrial I/O, avoiding destructive failure modes. |
| SSOP24 footprint | 5.3 mm body width enables higher PCB density than SO24 while maintaining manual solderability and standard reflow profiles. |
Applications
| Industrial PLC Backplane Interface | Legacy Bus Extender Module |
|---|---|
|
Use Scenario: Interfacing a 5 V microcontroller to a multi-slot PLC backplane carrying parallel I/O data with error detection. IC Role / Device Role / Timing Role: Bidirectional data transceiver with real-time parity validation between CPU and slot cards. Use Value: Hardware parity checking reduces firmware overhead by offloading error detection; 64 mA drive ensures signal integrity across 30 cm backplane traces. |
Use Scenario: Extending ISA or VMEbus signals between legacy host and modern peripheral modules using isolated voltage translation. IC Role / Device Role / Timing Role: Level-shifting transceiver with direction control and parity pass-through for backward-compatible data framing. Use Value: Configurable ODD/EVEN pin allows seamless integration with existing parity schemes; tPZH ≤ 6.5 ns meets ISA bus timing requirements. |
| Automotive Diagnostic Data Hub | Test Equipment Digital I/O Card |
|
Use Scenario: Aggregating diagnostic messages from multiple ECUs onto a centralized CAN-to-parallel bridge with integrity verification. IC Role / Device Role / Timing Role: Parity-enforced data concentrator that validates payload correctness before forwarding to host processor. Use Value: ERROR pin provides immediate fault indication for diagnostic logging; −40 °C to +85 °C rating supports under-hood deployment. |
Use Scenario: High-density digital I/O card in automated test equipment requiring simultaneous stimulus/response with error-checked data capture. IC Role / Device Role / Timing Role: Synchronized transceiver enabling concurrent read/write operations on shared test bus with parity assurance. Use Value: Dual 8-bit ports and fast 3-state enable allow rapid bus turnaround for pattern-based testing; BiCMOS speed supports 200+ MHz test clocks. |
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 |
|---|---|---|---|
| 74LVT657PW,118 | Lower drive (−24 mA/+32 mA), 3.3 V only, faster max speed (tPLH ≤ 3.2 ns), same pinout | Requires 3.3 V supply and level-shifting for 5 V buses; suited for mixed-voltage systems with tighter timing budgets | Select when migrating to 3.3 V domains or when lower power (<100 µA ICC) outweighs drive strength needs |
| SN74ABT657N | DIP-24 package, identical electrical specs, no SSOP variant available | Through-hole mounting only; incompatible with surface-mount production; larger board footprint | Choose only for prototyping, repair, or legacy through-hole designs where SSOP rework is impractical |
Compared with 74ABT657DB,112, the 74LVT657PW,118 trades drive strength and voltage compatibility for speed and power efficiency in 3.3 V systems, while the SN74ABT657N offers identical functionality in a legacy DIP package unsuitable for modern SMT assembly.
Availability
74ABT657DB,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic hubs, legacy bus extenders, and automated test equipment requiring stable component supply and long-term lifecycle support.
Supply support for 74ABT657DB,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
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 74ABT657DB,112 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered specifically for high-speed, low-power, bus-oriented applications demanding robust drive, precise timing, and hardware parity integrity in harsh industrial environments.
FAQ
What is the function of the ODD/EVEN pin on the 74ABT657DB,112?
The ODD/EVEN pin on the 74ABT657DB,112 configures the parity generator/checker to produce or validate either odd or even parity. When LOW, it selects even parity; when HIGH, it selects odd parity. This setting directly determines the logic state driven on the PARITY pin during transmit mode and the expected value checked during receive mode, enabling system-level compatibility with diverse parity protocols without firmware modification.
How does the ERROR pin behave during receive mode on the 74ABT657DB,112?
During receive mode (T/R = LOW), the 74ABT657DB,112 monitors B0–B7 and the PARITY input to compute expected parity. The ERROR pin goes HIGH when the actual parity matches the configured ODD/EVEN setting - indicating no error. It goes LOW when parity mismatches, signaling a transmission error. This real-time hardware flag eliminates software polling and accelerates fault response in safety-critical systems.
Can the 74ABT657DB,112 operate at 3.3 V supply voltage?
No, the 74ABT657DB,112 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. Supplying 3.3 V violates the minimum VCC requirement and will result in undefined logic states, degraded noise margins, and potential failure to meet timing specifications. For 3.3 V systems, consider the pin-compatible 74LVT657PW,118 instead.
What is the maximum capacitive load the 74ABT657DB,112 can drive on its outputs?
The 74ABT657DB,112 is characterized up to 50 pF load capacitance in its Dynamic Characteristics test conditions. While it may function with higher loads, propagation delays increase linearly with capacitance, and output voltage levels degrade beyond specification limits. For loads exceeding 50 pF, external buffering or series termination is recommended to maintain timing compliance and signal integrity.
Does the 74ABT657DB,112 support hot insertion into a live bus?
Yes - the 74ABT657DB,112 features power-up 3-state behavior and robust ESD protection (HBM >2000 V), allowing safe insertion into a powered bus. With OE held HIGH during insertion, all outputs remain high-impedance until system firmware asserts OE LOW and configures T/R, preventing bus contention. This capability is validated per JESD78B latch-up and JEDEC ESD standards.
74ABT657DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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-SSOP
74ABT657DB,112 FAQ
1.How can I place an order for 74ABT657DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT657DB,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 74ABT657DB,112 reliable?
The price and inventory of 74ABT657DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT657DB,112 is usually 5 days.
3.What payment methods are accepted for 74ABT657DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT657DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT657DB,112?
74ABT657DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT657DB,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 74ABT657DB,112?
For technical support, including 74ABT657DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT657DB,112 requirements.
6.How does Aetrix verify that 74ABT657DB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT657DB,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 74ABT657DB,112 meets industry standards.
7.What is the process for return or replacement of 74ABT657DB,112?
All 74ABT657DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT657DB,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 74ABT657DB,112 part is unused and in its original packaging.
Return procedure for 74ABT657DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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