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Texas Instruments SN74ABT623NSR
- Part No.:
- SN74ABT623NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT623NSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,918
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Product details
Overview
SN74ABT623NSR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data communication between A and B buses in 5-V TTL systems. It features dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), and operates across –40°C to 85°C. Used in backplane interfaces and memory expansion subsystems requiring bus isolation and direction control.
For engineers reviewing the SN74ABT623NSR datasheet, SN74ABT623NSR pinout, SN74ABT623NSR application, or SN74ABT623NSR equivalent, this page delivers verified electrical specs, functional timing behavior, package-validated pin mapping, and real-world use context for industrial bus interface design and legacy system upgrades.
Technical Context
The SN74ABT623NSR implements a dual-control 3-state transceiver architecture using EPIC-IIB BiCMOS process technology, enabling low power dissipation while maintaining TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) and fast switching (tPLH/tPHL ≤ 4.6 ns at 5 V). Its OEAB and OEBA inputs independently gate data flow in either direction, supporting both isolated bus operation and simultaneous bidirectional latching when both enables are active.
It provides true (non-inverting) data transfer with ground-bounce mitigation (VOLP < 1 V), latch-up immunity (>500 mA per JESD-17), and ESD protection exceeding 2 kV (MIL-STD-883) and 200 V (machine model). The device requires external pull-up on OEBA and pulldown on OEAB for controlled high-impedance state during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL logic rails and noise margin compliance. |
| Output Drive Strength | –32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to multiple TTL inputs without buffering. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns (CL = 50 pF) - Enables reliable operation in high-speed bus cycles up to ~100 MHz. |
| Enable/Disable Time | tPZH/tPLZ ≤ 7.5 ns - Guarantees rapid bus isolation during dynamic reconfiguration or hot-swap events. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and industrial ambient environments without derating. |
| Input Leakage Current | ±1 µA (control pins), ±100 µA (I/O ports) - Minimizes static current draw and prevents unintended logic transitions. |
| ESD Protection | >2000 V HBM, >200 V MM - Meets MIL-STD-883 requirements for robust handling in manufacturing and field service. |
Pinout & Package
SN74ABT623NSR is supplied in a 20-pin plastic DIP (N) package with 0.3-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output Enable A→B | Active-low control: enables data flow from A bus to B bus when low; pulls to GND via pulldown for power-up safety. |
| 2–9 (A1–A8) | A-side Data Inputs/Outputs | Bidirectional I/O pins connected to source bus; present high-impedance state when OEAB and OEBA are high. |
| 10 (GND) | Ground Reference | Primary signal return path; must be low-inductance connection to minimize ground bounce (VOLP < 1 V). |
| 11 (VCC) | Power Supply | +5 V supply rail; decoupling capacitor (0.1 µF ceramic) required within 1 cm for stable high-speed switching. |
| 12 (OEBA) | Output Enable B→A | Active-low control: enables data flow from B bus to A bus when low; ties to VCC via pullup for safe power-down. |
| 13–20 (B1–B8) | B-side Data Inputs/Outputs | Bidirectional I/O pins connected to destination bus; electrically identical to A-side pins in drive and timing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | OEAB and OEBA allow selective unidirectional or simultaneous bidirectional data transfer - critical for bus arbitration and shared-memory access. |
| High-current 3-state outputs | –32 mA IOH / 64 mA IOL drive strength sustains signal integrity across long traces or multi-drop bus configurations. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. standard bipolar TTL while retaining speed and noise immunity - typical ICC < 30 mA under load. |
| Controlled power-up/down behavior | Pullup/pulldown recommendations on OEBA/OEAB ensure defined high-Z state before logic initialization - prevents bus contention. |
| Robust latch-up immunity | Exceeds 500 mA per JEDEC JESD-17 - eliminates risk of destructive latch-up in noisy industrial power environments. |
Applications
| Industrial Backplane Interface | Legacy Memory Expansion |
|---|---|
Use Scenario: Interfacing microcontroller local bus to modular I/O carrier board via 20-conductor ribbon cable in programmable logic controller chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing address/data strobe handshaking between CPU and peripheral modules with configurable direction control. Use Value: Dual OE inputs enable precise timing alignment with WAIT and RD/WR signals; high drive strength maintains edge rate over 30-cm trace length. |
Use Scenario: Adding 256 KB SRAM to 80C188EB-based embedded controller where address/data bus must be shared with ROM and peripherals. IC Role / Device Role / Timing Role: Isolating memory bus segments during instruction fetch vs. data write cycles using OEAB/OEBA coordinated with MEMR/MEMW. Use Value: Sub-5 ns propagation delay ensures setup/hold timing margins remain positive at 12-MHz bus clock; 3-state outputs prevent contention during reset. |
| Test Equipment Bus Coupling | Automated Test Fixture Control |
Use Scenario: Connecting PXI-style instrumentation bus to custom DUT interface board requiring level translation and direction reversal for stimulus/response routing. IC Role / Device Role / Timing Role: Reversible data conduit synchronizing pattern generator outputs with digitizer inputs using OE-driven bus turnaround. Use Value: Simultaneous OEAB+OEBA activation allows transparent loopback mode for self-test; VOLP < 1 V prevents false triggering on sensitive analog comparators. |
Use Scenario: Controlling 16-channel relay matrix in semiconductor final test handler where microcontroller GPIOs must drive high-current coil drivers. IC Role / Device Role / Timing Role: Buffering and isolating MCU port lines from relay driver ICs, with OEBA used as global enable/disable for safety interlocks. Use Value: 64-mA sink capability directly drives ULN2003A inputs without series resistors; thermal impedance (67°C/W) supports continuous operation at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Octal transceiver with single-direction control (DIR) and output enable (OE); no dual-OE latching mode. | Lacks simultaneous A↔B latching capability; simpler control but less flexible for bidirectional arbitration. | Choose when direction is fixed per transaction and space-constrained PCB layout favors SOIC-20 over DIP-20. |
| 74ACT16245MTDX | 16-bit version in TSSOP-48; ACT logic family (lower ICC, higher VIH/VIL thresholds), 4.5–5.5 V supply. | Higher channel count and different pinout; not drop-in compatible; suited for dense, high-density digital backplanes. | Select for new designs needing wider bus width and lower static power; requires full layout revision. |
Compared with SN74ABT245N and 74ACT16245MTDX, the SN74ABT623NSR uniquely supports dual-enable latching and legacy DIP packaging-making it irreplaceable for field-repairable industrial controllers and backward-compatible memory expansions where pinout and control semantics must match existing schematics.
Availability
SN74ABT623NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory expansion systems, and automated test fixture control requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT623NSR 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 industrial-grade interface ICs.
The SN74ABT623NSR belongs to TI's ABT logic family-designed specifically for high-speed, low-noise, 5-V TTL-compatible bus interfacing in mission-critical industrial and test equipment.
FAQ
What is the maximum operating frequency supported by the SN74ABT623NSR?
The SN74ABT623NSR does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 4.6 ns at CL = 50 pF) and enable/disable times (≤7.5 ns) support reliable operation in bus systems running up to approximately 100 MHz, assuming proper trace termination and load capacitance control. System-level timing must account for worst-case delays across temperature and voltage.
Can the SN74ABT623NSR operate at 3.3 V?
No, the SN74ABT623NSR is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL compatibility. Operating below 4.5 V may result in undefined logic states, reduced noise margin, or failure to meet timing specifications.
How should OEAB and OEBA be biased during power-up to avoid bus contention?
To ensure high-impedance state at power-up, OEBA must be tied to VCC via a pullup resistor (value determined by driver sourcing capability), and OEAB must be tied to GND via a pulldown resistor (value based on driver sinking capability). This guarantees both enables are inactive (high) until firmware asserts valid control logic.
Does the SN74ABT623NSR support hot-swap operation?
The SN74ABT623NSR is not hot-swap rated. While its high-impedance outputs and robust ESD/latch-up performance improve resilience, it lacks built-in current limiting or slew-rate control required for safe insertion into live backplanes. External protection circuitry is recommended for such use cases.
What is the thermal resistance (θJA) of the SN74ABT623NSR in its N-package?
The SN74ABT623NSR in the plastic DIP (N) package has a junction-to-ambient thermal resistance (θJA) of 67°C/W, as specified in the absolute maximum ratings table. This value assumes standard JEDEC test conditions (single-layer board, 1 in² copper pad) and guides heatsinking decisions for continuous high-current operation at elevated ambient temperatures.
SN74ABT623NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 20-SO
SN74ABT623NSR FAQ
1.How can I place an order for SN74ABT623NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT623NSR 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 SN74ABT623NSR reliable?
The price and inventory of SN74ABT623NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT623NSR is usually 5 days.
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4.How is shipping managed for SN74ABT623NSR?
SN74ABT623NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT623NSR 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 SN74ABT623NSR?
For technical support, including SN74ABT623NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT623NSR requirements.
6.How does Aetrix verify that SN74ABT623NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT623NSR 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 SN74ABT623NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT623NSR?
All SN74ABT623NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT623NSR, 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 SN74ABT623NSR part is unused and in its original packaging.
Return procedure for SN74ABT623NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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