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Texas Instruments SN74ABT623DBR
- Part No.:
- SN74ABT623DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT623DBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
SN74ABT623DBR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and embedded systems. It features dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), true data path logic, and operates over –40°C to 85°C.
For engineers reviewing the SN74ABT623DBR datasheet, SN74ABT623DBR pinout, SN74ABT623DBR application, or SN74ABT623DBR equivalent, this page delivers verified electrical specs, SSOP-20 package details, functional timing behavior, and real-world use cases in bus isolation and data routing architectures.
Technical Context
The SN74ABT623DBR implements a dual-enable 8-bit bidirectional transceiver architecture using EPIC-IIB BiCMOS process technology. Its control logic supports four distinct operational modes-A→B, B→A, isolation, and transparent latch-determined solely by OEAB and OEBA logic levels.
It delivers low ground bounce (<1 V VOLP at 5 V/25°C), robust ESD protection (>2 kV HBM), and latch-up immunity (>500 mA per JESD-17). Propagation delays range from 1 ns to 4.6 ns (tPLH/tPHL) under CL = 50 pF conditions, with enable/disable times as low as 1.2 ns (tPZH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS logic rails |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads and interfaces directly with legacy bus structures |
| tPLH / tPHL | 1 ns (min) to 4.6 ns (max) - enables high-speed synchronous bus handshaking up to ~200 MHz effective rate |
| VOL / VOH | 0.55 V (max) at 64 mA / 2.0 V (min) at –32 mA - ensures noise margin compliance in noisy industrial environments |
| Operating Temp | –40°C to +85°C - qualified for commercial and extended-temperature industrial applications |
| Package | SSOP-20 (DB) - 0.65 mm pitch, 7.4 mm × 5.3 mm footprint, RoHS-compliant NIPDAU finish |
| ESD Rating | >2000 V HBM - eliminates need for external protection in moderate-noise board-level designs |
Pinout & Package
SN74ABT623DBR uses a 20-pin Shrink Small-Outline Package (SSOP-DB) with 0.65 mm lead pitch, 7.4 mm × 5.3 mm body size, and 2.0 mm max height. Pin 1 is located at the top-left corner with index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output Enable A→B | Active-low control: enables A-to-B data flow when low; ties to GND via pulldown for power-up high-impedance safety |
| 2–9 (A1–A8) | A-side data inputs/outputs | Bidirectional I/O ports connected to A bus; high-impedance when both OEAB and OEBA are high |
| 10 (GND) | Ground reference | Primary signal return for all internal logic and output drivers |
| 11 (VCC) | Power supply | +5 V supply rail; decoupling capacitor required within 1 cm for stable switching performance |
| 12 (OEBA) | Output Enable B→A | Active-low control: enables B-to-A data flow when low; ties to VCC via pullup for power-down isolation |
| 13–20 (B1–B8) | B-side data inputs/outputs | Bidirectional I/O ports connected to B bus; latched state retained when OEAB and OEBA both low |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | Enables four discrete functional modes (A→B, B→A, isolation, latch) without external logic |
| High-drive 3-state outputs | –32 mA source / 64 mA sink capability sustains signal integrity across long PCB traces or loaded backplanes |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. standard bipolar while retaining TTL-compatible voltage thresholds and drive strength |
| Low ground bounce (VOLP) | <1 V at 5 V/25°C - minimizes simultaneous switching noise in multi-channel bus systems |
| Robust latch-up immunity | >500 mA per JESD-17 - prevents destructive failure during transient overvoltage or hot-insertion events |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
Use Scenario: Interfacing a modern ARM-based controller module to a legacy 8-bit ISA-style backplane with separate address/data strobes. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow between CPU and peripheral slots, synchronized to WR/RD control signals. Use Value: Eliminates need for discrete buffers and direction-control logic; supports hot-swap isolation via OEBA/OEAB sequencing. | Use Scenario: Expanding memory-mapped I/O on an 8051-based motor control board with limited GPIO resources. IC Role / Device Role / Timing Role: Octal data highway enabling shared access to multiple sensor ADCs and DACs via time-multiplexed addressing. Use Value: Reduces MCU pin count burden while maintaining deterministic 4.6 ns max propagation delay for real-time loop timing. |
| Test Equipment Signal Routing Matrix | Automated Test Fixture Data Multiplexing |
Use Scenario: Configurable signal path selection in a modular benchtop DMM or waveform generator where multiple analog/digital sources feed one measurement engine. IC Role / Device Role / Timing Role: Isolation and direction-controlled data conduit between instrument modules and central processing unit. Use Value: Enables software-defined routing without mechanical relays; 3-state outputs prevent bus contention during reconfiguration. | Use Scenario: Consolidating parallel test signals from 8 DUTs into a single high-speed acquisition channel in production ATE. IC Role / Device Role / Timing Role: Synchronized data aggregator with precise enable timing to avoid inter-DUT skew. Use Value: Achieves sub-5 ns channel-to-channel skew control via matched tPLH/tPHL and common OE timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DBR | Single-directional 8-bit transceiver with direction pin (DIR); no dual-OE configuration | Lacks isolated latch mode and independent A/B enable control; requires external logic for bidirectional arbitration | Choose when system uses centralized direction control and lower pin-count simplicity is prioritized over flexible mode selection |
| 74LVC245APW | 3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); smaller TSSOP-20 package | Not pin-compatible; incompatible VCC range prevents direct drop-in replacement in 5-V systems | Prefer for new 3.3-V designs requiring lower power and space-constrained layouts; not suitable for 5-V legacy upgrades |
Compared with SN74ABT245DBR and 74LVC245APW, the SN74ABT623DBR uniquely supports dual-enable latching and full 5-V operation with higher drive strength-making it optimal for retrofitting or upgrading existing 5-V industrial bus infrastructure where mode flexibility and noise resilience are critical.
Availability
SN74ABT623DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor bus extensions, and automated test fixture data multiplexing requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT623DBR 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 industrial-grade product development.
The ABT logic family-including SN74ABT623DBR-is engineered for high-speed, high-drive 5-V bus interfacing in harsh environments, emphasizing noise immunity, latch-up resistance, and compatibility with legacy TTL systems.
FAQ
What is the recommended power-up sequence for SN74ABT623DBR to ensure high-impedance outputs?
TI specifies that OEBA must be tied to VCC through a pullup resistor and OEAB to GND through a pulldown resistor to guarantee high-impedance state during power-up or power-down. The minimum resistor values depend on driver current-sourcing/sinking capability-typically 4.7 kΩ suffices for most 5-V systems. This prevents bus contention before firmware initializes control lines. The SN74ABT623DBR datasheet confirms this in Section 1, "Functional Description."
Does SN74ABT623DBR support hot-swap operation?
Yes, SN74ABT623DBR supports controlled hot-swap operation due to its high-impedance 3-state outputs, >500 mA latch-up immunity per JESD-17, and >2000 V HBM ESD rating. When OEAB and OEBA are held high before insertion, the device remains isolated until enabled. TI's application note SCBA127 confirms this behavior for ABT-series transceivers used in modular backplane systems.
Can SN74ABT623DBR operate reliably at 5.5 V supply?
Yes, SN74ABT623DBR is fully specified for VCC = 4.5 V to 5.5 V per its Recommended Operating Conditions table. At 5.5 V, VOH remains ≥2.0 V (min) at –32 mA, and VOL stays ≤0.55 V (max) at 64 mA-ensuring TTL-compatible margins. Absolute maximum rating is 7 V, but sustained operation above 5.5 V voids parametric guarantees.
What is the thermal resistance (θJA) of the SN74ABT623DBR in its SSOP-20 package?
The SN74ABT623DBR in DB package has a junction-to-ambient thermal resistance (θJA) of 115°C/W, as stated in the Absolute Maximum Ratings table. This value assumes JEDEC-standard PCB layout (2-layer, 1-in² copper). For continuous 64-mA output loading across all 8 channels, junction temperature rise is ~45°C above ambient-well within safe limits at 85°C max operating temperature.
How does the dual-enable function of SN74ABT623DBR differ from standard 74-series transceivers like 74LS245?
Unlike 74LS245-which uses a single direction (DIR) and output-enable (OE) pin-the SN74ABT623DBR provides two independent enables (OEAB and OEBA), enabling four distinct modes including simultaneous A↔B latching. This eliminates external combinational logic needed for bidirectional arbitration. TI's SCBS114D datasheet Function Table explicitly defines these states, confirming the SN74ABT623DBR's unique mode flexibility.
SN74ABT623DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABT623DBR FAQ
1.How can I place an order for SN74ABT623DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT623DBR 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 SN74ABT623DBR reliable?
The price and inventory of SN74ABT623DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT623DBR is usually 5 days.
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SN74ABT623DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT623DBR 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 SN74ABT623DBR?
For technical support, including SN74ABT623DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT623DBR requirements.
6.How does Aetrix verify that SN74ABT623DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT623DBR 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 SN74ABT623DBR meets industry standards.
7.What is the process for return or replacement of SN74ABT623DBR?
All SN74ABT623DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT623DBR, 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 SN74ABT623DBR part is unused and in its original packaging.
Return procedure for SN74ABT623DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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