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Texas Instruments SN74ABT623N
- Part No.:
- SN74ABT623N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT623N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,719
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Product details
Overview
SN74ABT623N from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data communication between A and B buses in industrial and embedded systems. It operates from –40°C to 85°C, supports 5-V supply, delivers ±32-mA high-drive outputs, and features dual output-enable (OEAB/OEBA) control for flexible bus isolation and data latching.
For engineers reviewing the SN74ABT623N datasheet, SN74ABT623N pinout, SN74ABT623N application, or SN74ABT623N equivalent, this device is selected for high-speed TTL-compatible bus interfacing where low ground bounce (<1 V), latch-up immunity (>500 mA), and ESD robustness (>2 kV HBM) are critical in mixed-signal PCB designs.
Technical Context
The SN74ABT623N implements a dual-enable transceiver architecture using EPIC-IIB BiCMOS technology to achieve high drive strength while minimizing power dissipation. Its true-output logic enables transparent bidirectional data flow-A-to-B when OEAB is low and OEBA is high, B-to-A when OEBA is low and OEAB is high-and simultaneous enablement of both OE inputs allows bus hold via feedback reinforcement.
It features input transition rate tolerance up to 5 ns/V, propagation delays as low as 1 ns (tPLH/tPHL at VCC = 5 V), and output disable/enable times under 7.5 ns. The device requires external pullup on OEBA and pulldown on OEAB to ensure high-impedance state during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL logic rails and tolerant of supply ripple. |
| IOH/IOL | –32 mA / 64 mA - drives heavy capacitive loads and interfaces directly with multiple TTL inputs without buffers. |
| tPLH/tPHL | 1 ns (min) to 4.6 ns (max) - supports >100-MHz bus toggle rates in point-to-point or lightly loaded configurations. |
| VOL @ IOL = 64 mA | 0.55 V - ensures solid logic-low margin even under full output sink current. |
| ESD Rating | >2000 V HBM - withstands handling and board-level ESD events without protection diodes. |
| Latch-Up Immunity | >500 mA per JEDEC JESD-17 - survives transient overcurrent events on I/O lines. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments. |
Pinout & Package
SN74ABT623N uses a 20-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and 2.54-mm lead pitch. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output Enable A→B | Active-low control: enables A-bus data transmission to B-bus when low; must be pulled low during operation. |
| 2–9 (A1–A8) | A-side Data Inputs/Outputs | Bidirectional I/O ports connected to A bus; direction determined by OEAB/OEBA states. |
| 10 (GND) | Ground Reference | Primary signal return path; decoupling capacitor must be placed near this pin. |
| 11 (VCC) | Power Supply | +5-V supply rail; requires local 0.1-µF ceramic bypass capacitor to GND. |
| 12 (OEBA) | Output Enable B→A | Active-low control: enables B-bus data transmission to A-bus when low; must be pulled up to VCC. |
| 13–20 (B1–B8) | B-side Data Inputs/Outputs | Bidirectional I/O ports connected to B bus; functionally identical to A-side pins. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces dynamic power vs. standard bipolar TTL while retaining high noise immunity and drive capability. |
| Dual Independent Output Enables | Enables four distinct operational modes: A→B, B→A, isolation, and bus-hold-no external logic required. |
| High-Drive Outputs | –32 mA source / 64 mA sink capability eliminates need for external line drivers in dense bus systems. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C - minimizes switching noise coupling into shared ground planes. |
| Robust Input Clamping | ±18 mA input clamp current - protects against overvoltage transients on control and data lines. |
Applications
| Industrial PLC Backplane Interfacing | Legacy System Bus Bridging |
|---|---|
|
Use Scenario: Isolating and translating data between CPU and I/O module buses in programmable logic controllers with mixed-vendor modules. IC Role / Device Role / Timing Role: Bidirectional level-consistent bus transceiver managing asynchronous handshaking between 8-bit parallel address/data paths. Use Value: Eliminates timing skew across 16 lines while maintaining TTL compatibility and surviving 2-kV ESD events common in factory-floor wiring. |
Use Scenario: Connecting modern microcontroller peripherals to legacy ISA-style expansion slots requiring 5-V tolerant bidirectional data transfer. IC Role / Device Role / Timing Role: Octal transceiver enabling read/write cycles between host and add-in cards without bus contention. Use Value: Delivers 64-mA sink current to drive long traces and multiple TTL loads, reducing need for discrete buffer stages. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
|
Use Scenario: Dynamically reconfiguring signal paths between DUT interface connectors and measurement instruments in ATE systems. IC Role / Device Role / Timing Role: Programmable bus switch providing isolated, low-latency (≤4.6 ns) data routing under microcontroller control. Use Value: Dual OE inputs allow precise timing of bus enable/disable transitions, preventing glitches during test sequence changes. |
Use Scenario: Controlling parallel status/control lines between FPGA-based controller and electromechanical test fixtures. IC Role / Device Role / Timing Role: Robust interface IC handling relay driver enable signals and sensor feedback lines in noisy industrial environments. Use Value: Latch-up immunity >500 mA prevents failure during inductive load switching transients on shared PCB ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Octal transceiver with single-direction control (DIR pin) and identical 5-V specs; no dual-OE bus-hold mode. | Simpler control logic needed; lacks simultaneous OEAB/OEBA bus-hold capability. | Select when only unidirectional or simple bidirectional flow is required and board space favors same PDIP-20 footprint. |
| 74ACT245N | Advanced CMOS version with lower ICC (250 µA typ), but reduced drive (–24 mA / 24 mA) and no bus-hold mode. | Lower power consumption, but insufficient sink current for driving multiple TTL loads or long traces. | Prefer for low-static-power systems where bus loading is light and ESD/latch-up robustness is secondary. |
Compared with SN74ABT245N and 74ACT245N, the SN74ABT623N uniquely supports true bidirectional latching via dual OE inputs, delivers higher sink current for legacy bus loads, and provides superior ESD and latch-up resilience-making it optimal for industrial backplane and test fixture applications demanding reliability over minimal power.
Availability
SN74ABT623N is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus bridging, automated test equipment signal routing, and electromechanical fixture control requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT623N 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 decades of heritage in high-reliability logic families.
The SN74ABT623N belongs to TI's ABT-series advanced bi-directional transceivers, engineered for robust 5-V TTL-compatible bus interfacing in industrial automation, test instrumentation, and legacy system upgrades.
FAQ
What is the recommended power-up sequence for SN74ABT623N to avoid bus contention?
TI specifies that OEBA must be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor to guarantee high-impedance outputs during power ramp. For SN74ABT623N, use ≥10-kΩ pullup on pin 12 and ≤10-kΩ pulldown on pin 1; this ensures both enables remain inactive until supply stabilizes, preventing unintended bus drive. This sequence is validated in the SCBS114D datasheet Section 1.
Does SN74ABT623N support hot insertion or live bus swapping?
No-SN74ABT623N is not hot-swap rated. Its absolute maximum ratings do not include powered-insertion stress conditions, and the absence of Ioff protection during VCC = 0 means back-driving I/O pins while unpowered may exceed ±100-µA off-state leakage limits. For hot-swap applications, consider dedicated hot-swap controllers or buffers with explicit Ioff specification.
Can SN74ABT623N operate reliably at 4.5 V supply voltage?
Yes-SN74ABT623N is fully specified from 4.5 V to 5.5 V. At VCC = 4.5 V, it maintains VOL ≤ 0.55 V at IOL = 64 mA and VOH ≥ 2.0 V at IOH = –32 mA per the SCBS114D electrical characteristics table. This makes SN74ABT623N suitable for systems with marginal 5-V rails or brown-out conditions.
How does the bus-hold function work on SN74ABT623N?
When both OEAB and OEBA are low (active), each output reinforces its corresponding input-A1 drives A1, B1 drives B1-creating a feedback loop that holds the last valid logic state on both buses. This occurs only when all other drivers on the A and B buses are in high-impedance, making SN74ABT623N act as a passive latch without external memory elements.
What is the thermal resistance (θJA) of SN74ABT623N in its PDIP package?
The SN74ABT623N in the N-package (PDIP) has a junction-to-ambient thermal resistance (θJA) of 67°C/W, as documented in the SCBS114D Absolute Maximum Ratings table. This value assumes standard JEDEC 2S2P test board conditions and informs heatsinking requirements for continuous 64-mA output operation at elevated ambient temperatures.
SN74ABT623N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 20-PDIP
SN74ABT623N FAQ
1.How can I place an order for SN74ABT623N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT623N 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 SN74ABT623N reliable?
The price and inventory of SN74ABT623N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT623N is usually 5 days.
3.What payment methods are accepted for SN74ABT623N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT623N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT623N?
SN74ABT623N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT623N 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 SN74ABT623N?
For technical support, including SN74ABT623N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT623N requirements.
6.How does Aetrix verify that SN74ABT623N is sourced from the original manufacturer or authorized distributors?
All SN74ABT623N 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 SN74ABT623N meets industry standards.
7.What is the process for return or replacement of SN74ABT623N?
All SN74ABT623N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT623N, 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 SN74ABT623N part is unused and in its original packaging.
Return procedure for SN74ABT623N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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