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Texas Instruments SN74ABT623PWLE
- Part No.:
- SN74ABT623PWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74ABT623PWLE.pdf
- Description:
- BUS TRANSCEIVER, ABT SERIES
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Inventory:4,000
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Product details
Overview
SN74ABT623PWLE from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data communication between A and B buses in industrial and computing 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 with 4.5–5.5 V supply.
For engineers reviewing the SN74ABT623PWLE datasheet, SN74ABT623PWLE pinout, SN74ABT623PWLE application, or SN74ABT623PWLE equivalent, key selection considerations include bidirectional bus isolation timing, 3-state control flexibility, output drive strength under load, and TSSOP-20 thermal performance at 128°C/W θJA.
Technical Context
The SN74ABT623PWLE implements a dual-enable architecture enabling four distinct operational modes: A→B transmission (OEAB low, OEBA high), B→A transmission (OEAB high, OEBA low), full isolation (both enables high), and data latching (both enables low). Its EPIC-II™B BiCMOS process delivers low ground bounce (<1 V VOLP) and latch-up immunity (>500 mA per JESD-17).
Signal integrity is maintained via controlled input transition rates (≤5 ns/V), ESD protection exceeding 2000 V (MIL-STD-883), and tight voltage thresholds (VIH = 2 V, VIL = 0.8 V). Propagation delays range from 1.0 ns (tPLH min) to 4.6 ns (tPHL max) at 5 V/25°C with 50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS logic rails without level-shifting. |
| IOH / IOL | –32 mA / 64 mA - Drives heavy capacitive loads and multiple inputs while maintaining valid VOH/VOL margins. |
| tPLH / tPHL | 1.0–4.6 ns - Supports high-speed bus handshaking in memory interfaces and backplane applications up to ~200 MHz. |
| θJA | 128°C/W - Defines thermal derating limit for continuous operation in compact TSSOP-20 PCB layouts. |
| VIH / VIL | 2.0 V / 0.8 V - Guarantees robust noise margin against TTL-compatible drivers and avoids metastability in mixed-voltage systems. |
| ESD Rating | >2000 V HBM - Reduces risk of field failure during handling and board assembly in non-ESD-controlled environments. |
| Operating Temp | –40°C to +85°C - Qualified for industrial temperature range, suitable for embedded controllers and communications equipment. |
Pinout & Package
TSSOP-20 package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, 1.2 mm max height, gull-wing leads, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output Enable A→B | Active-low control: enables data flow from A-bus inputs to B-bus outputs when low. |
| 2–9 (A1–A8) | A-Bus Data Inputs/Outputs | Bidirectional I/O pins tied to A-side system bus; high-impedance when both OEAB and OEBA are high. |
| 10 (GND) | Ground Reference | Primary power return path; must be low-inductance connection to minimize ground bounce during switching. |
| 11 (VCC) | Supply Voltage | +5 V nominal supply; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 12 (OEBA) | Output Enable B→A | Active-low control: enables data flow from B-bus inputs to A-bus outputs when low. |
| 13–20 (B1–B8) | B-Bus Data Inputs/Outputs | Bidirectional I/O pins tied to B-side system bus; isolated when both OEAB and OEBA are high. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state enables | OEAB and OEBA allow asymmetric bus control-e.g., isolate A while driving B, or latch data on both buses simultaneously. |
| High-drive BiCMOS outputs | –32 mA source / +64 mA sink capability maintains signal integrity across 15+ cm traces or 10+ TTL loads. |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V - Minimizes logic errors caused by simultaneous output switching in dense PCB layouts. |
| Robust latch-up immunity | >500 mA per JESD-17 - Prevents destructive current runaway during transient overvoltage or hot-insertion events. |
| Wide operating voltage range | 4.5–5.5 V - Accommodates supply tolerance and aging drift without functional degradation. |
Applications
| Memory Subsystem Interfacing | Industrial PLC Backplane |
|---|---|
Use Scenario: Connecting microcontroller address/data bus to SRAM or flash memory array with shared bus arbitration. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating CPU and memory during read/write cycles; enables clean enable/disable timing via OEAB/OEBA sequencing. Use Value: Eliminates bus contention during memory access transitions; supports 4.6 ns max propagation delay for sub-200 MHz timing budgets. | Use Scenario: Interfacing modular I/O cards to central controller bus in programmable logic controller chassis. IC Role / Device Role / Timing Role: Hot-swap-capable bus transceiver providing galvanic isolation between modules during insertion/removal. Use Value: Dual OE control allows safe power-up sequencing; latch mode holds last state during module reconfiguration. |
| Legacy Peripheral Bridge | Test Equipment Bus Interface |
Use Scenario: Adapting ISA or PC/104 bus signals to modern FPGA-based controller with different voltage or timing requirements. IC Role / Device Role / Timing Role: Level-tolerant bidirectional translator supporting mixed-voltage domains via 2.0 V VIH threshold and 5.5 V absolute max ratings. Use Value: Enables drop-in replacement of obsolete transceivers without redesigning enable logic or adding external level shifters. | Use Scenario: Routing digital stimulus/response signals between automated test equipment mainframe and DUT interface boards. IC Role / Device Role / Timing Role: High-reliability bus repeater ensuring signal fidelity across long ribbon cables with 64 mA drive into 50 Ω loads. Use Value: Low VOLP and fast edge rates preserve eye diagram integrity; ESD hardening prevents field failures during probe contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245PW | Octal transceiver with single-direction control (DIR pin); no dual-OE architecture. | Lacks independent A↔B isolation; requires external logic for bidirectional gating. | Choose when unidirectional data flow dominates and board space favors simpler control. |
| SN74LVC245APW | 3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); higher input capacitance (5 pF vs 4 pF). | Not compatible with 5-V systems; unsuitable for legacy TTL interfacing or high-current loads. | Prefer for new 3.3-V designs where power efficiency and smaller die size outweigh drive strength needs. |
Compared with SN74ABT245PW and SN74LVC245APW, the SN74ABT623PWLE uniquely supports true bidirectional bus isolation via two independent enables-critical for memory arbitration and hot-swap systems-while delivering superior 5-V drive strength and industrial temperature resilience.
Availability
SN74ABT623PWLE is available at Aetrix Electronics and suitable for industrial automation, legacy computing upgrades, and test equipment requiring stable component supply despite its OBSOLETE status per TI's packaging addendum.
Supply support for SN74ABT623PWLE 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 industrial-grade logic families.
The ABT logic family-including SN74ABT623PWLE-is engineered for high-speed, high-drive 5-V bus interfacing in mission-critical industrial and computing infrastructure where reliability and timing precision are paramount.
FAQ
What is the recommended power-up sequence for SN74ABT623PWLE 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 during power-up. The minimum resistor values depend on driver current-sourcing/sinking capability. This ensures both outputs remain in high-impedance state until firmware asserts valid enable logic, preventing bus contention. The SN74ABT623PWLE datasheet confirms this requirement on page 1.
Does SN74ABT623PWLE support hot-swap operation, and what design precautions apply?
Yes-the SN74ABT623PWLE supports hot-swap due to its high latch-up immunity (>500 mA per JESD-17), robust ESD protection (>2000 V HBM), and ability to maintain high-impedance states during power transitions. To implement safely, use series current-limiting resistors on A/B bus lines and ensure OEAB/OEBA are held inactive (high) until VCC stabilizes. These behaviors are verified in the SN74ABT623PWLE absolute maximum ratings and application notes.
Can SN74ABT623PWLE interface directly with 3.3-V logic, and what limitations exist?
No-SN74ABT623PWLE is a 5-V-only device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, but its inputs are not 5-V tolerant when powered from 3.3 V. Driving it from 3.3-V sources risks violating input voltage limits (VI < 0 or > VCC). For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible alternative like SN74LVC245APW is required. This limitation is explicit in the SN74ABT623PWLE recommended operating conditions table.
What is the thermal derating limit for continuous operation of SN74ABT623PWLE in TSSOP-20 package?
The SN74ABT623PWLE has a junction-to-ambient thermal resistance (θJA) of 128°C/W in the PW (TSSOP-20) package. At 25°C ambient and 5.5 V supply, maximum allowable power dissipation before exceeding 125°C junction temperature is ~0.78 W. Derating begins linearly above 25°C at 7.8 mW/°C. This value is specified in the SN74ABT623PWLE absolute maximum ratings table under "Package thermal impedance."
How does the dual-enable architecture of SN74ABT623PWLE improve bus arbitration compared to single-enable transceivers?
The SN74ABT623PWLE's independent OEAB and OEBA pins enable four discrete operational states-including simultaneous isolation of both buses or latching of data on both sides-which eliminates need for external glue logic. Single-enable devices like SN74ABT245 require additional gates to replicate bidirectional gating, increasing propagation delay and board area. This architectural advantage is documented in the SN74ABT623PWLE function table and logic diagram.
SN74ABT623PWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT623PWLE FAQ
1.How can I place an order for SN74ABT623PWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT623PWLE 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 SN74ABT623PWLE reliable?
The price and inventory of SN74ABT623PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT623PWLE is usually 5 days.
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SN74ABT623PWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT623PWLE 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 SN74ABT623PWLE?
For technical support, including SN74ABT623PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT623PWLE requirements.
6.How does Aetrix verify that SN74ABT623PWLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT623PWLE 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 SN74ABT623PWLE meets industry standards.
7.What is the process for return or replacement of SN74ABT623PWLE?
All SN74ABT623PWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT623PWLE, 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 SN74ABT623PWLE part is unused and in its original packaging.
Return procedure for SN74ABT623PWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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