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Texas Instruments SN74ABT640DWRE4
- Part No.:
- SN74ABT640DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT640DWRE4.pdf
- Description:
- IC TXRX INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
SN74ABT640DWRE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL-compatible systems. It features inverted data transmission, direction control (DIR), output-enable (OE) logic, high-drive capability (–32 mA IOH / 64 mA IOL), and operates from –40°C to 85°C.
For engineers reviewing the SN74ABT640DWRE4 datasheet, SN74ABT640DWRE4 pinout, SN74ABT640DWRE4 application, or SN74ABT640DWRE4 equivalent, this page delivers verified electrical specs, functional truth table behavior, SOIC-20 package details, thermal resistance (97°C/W), and real-world isolation and drive performance metrics critical for bus interface design.
Technical Context
The SN74ABT640DWRE4 implements a dual-octet bidirectional transceiver architecture with active-low OE enabling full 3-state isolation and DIR-controlled signal flow direction (A→B or B→A). Its EPIC-IIB BiCMOS process enables low power dissipation while maintaining TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) and robust ESD protection (>2000 V HBM).
Propagation delays are tightly specified: tPLH/tPHL ≤ 5 ns at VCC = 5 V, CL = 50 pF; enable/disable times (tPZL/tPHZ) range from 1.3 ns to 6.8 ns. Output ground bounce (VOLP) remains below 1 V at 5 V/25°C, supporting noise-sensitive digital backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial 5-V rail tolerances. |
| IOH / IOL | –32 mA / 64 mA - Drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 1 ns (min) to 4.9 ns (max) - Supports >200-MHz bus toggle rates in point-to-point configurations. |
| θJA | 97°C/W (DW package) - Enables thermal-aware PCB layout with standard copper pour for continuous 32-mA sink operation. |
| VIH / VIL | 2.0 V / 0.8 V - Fully compatible with legacy TTL and LVTTL logic families without level shifting. |
| IOZH / IOZL | ±50 µA - Guarantees minimal leakage during 3-state isolation, preserving bus integrity in powered-down subsystems. |
| Operating Temp | –40°C to +85°C - Qualified for commercial and industrial ambient environments without derating. |
Pinout & Package
SN74ABT640DWRE4 is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013 footprint. Pin 1 is located at the top-left corner with notch or bevel indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: Low = B→A data flow; High = A→B data flow. |
| 2–9 | A1–A8 | Input/output port A - Bidirectional data lines tied to one system bus segment. |
| 10 | GND | Ground reference for all internal circuitry and I/O drivers. |
| 11 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required within 1 cm. |
| 12 | OE | Active-low output enable: High = high-impedance state; tie to VCC via pullup for safe power-up. |
| 13–20 | B1–B8 | Input/output port B - Bidirectional data lines tied to second system bus segment. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted Data Path | Transmits complemented logic levels between A and B ports - supports differential signaling schemes and parity generation. |
| High-Drive Outputs | –32 mA source / 64 mA sink capability eliminates need for external bus drivers in dense backplane designs. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C - Reduces simultaneous switching noise in multi-transceiver bus systems. |
| BiCMOS Process | EPIC-IIB architecture cuts dynamic power vs. bipolar-only equivalents while retaining speed and drive strength. |
| Robust ESD Rating | >2000 V HBM - Survives handling and board assembly without special ESD controls beyond standard practices. |
Applications
| Industrial PLC Backplane | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing isolated CPU modules to distributed I/O racks over shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow direction and isolating segments during fault conditions. Use Value: 64-mA sink current drives long traces and multiple receivers; 3-state isolation prevents contention during hot-swap events. |
Use Scenario: Extending address/data bus between aging microcontroller and newly added peripheral FPGA. IC Role / Device Role / Timing Role: Level-shifting and buffering interface ensuring timing-compliant handshaking across mixed-logic-generation subsystems. Use Value: 4.9-ns max propagation delay meets setup/hold timing budgets; TTL-compatible VIH/VIL eliminates external translators. |
| Test Equipment Data Acquisition | Automated Test Fixture Control |
|
Use Scenario: Routing sensor data from analog front-end ADCs to host controller in modular benchtop instrument. IC Role / Device Role / Timing Role: Synchronized bus repeater enabling concurrent read/write operations across isolated measurement domains. Use Value: DIR-controlled flow direction supports full-duplex test sequencing; OE-driven isolation prevents bus lockup during calibration mode. |
Use Scenario: Controlling multiple DUT interface boards from central test sequencer using shared control bus. IC Role / Device Role / Timing Role: Isolation gate preventing backfeed from powered DUTs into sequencer during power-cycling sequences. Use Value: ±50 µA 3-state leakage ensures no false triggering; latch-up immunity (>500 mA) withstands transient faults on fixture wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DWRE4 | Non-inverting data path; identical SOIC-20 package, drive strength, and timing specs. | Suitable where signal polarity must be preserved (e.g., address bus extension). | Select SN74ABT245DWRE4 when unidirectional or non-inverted bidirectional transfer is required instead of inversion. |
| SN74LVC245APWRE4 | 3.3-V only operation (1.65–3.6 V), lower drive (–24/+24 mA), smaller TSSOP-20 package. | Used in modern low-voltage embedded systems; not pin-compatible due to different voltage domain and thermal profile. | Choose SN74LVC245APWRE4 only for 3.3-V designs requiring space-constrained layouts - not a drop-in replacement. |
Compared with SN74ABT640DWRE4, SN74ABT245DWRE4 provides identical physical and electrical compatibility except for data inversion, making it a direct functional alternative where polarity is unconstrained; SN74LVC245APWRE4 serves distinct low-voltage use cases but requires PCB redesign and voltage translation.
Availability
SN74ABT640DWRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for SN74ABT640DWRE4 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 interface ICs.
The ABT logic family-including SN74ABT640DWRE4-was engineered for robust 5-V bus interfacing in industrial and telecom infrastructure, emphasizing drive strength, noise immunity, and thermal resilience.
FAQ
What is the function of the DIR pin on the SN74ABT640DWRE4?
The DIR (direction) pin on the SN74ABT640DWRE4 determines data flow direction: when DIR is low, data transfers from B bus to A bus; when DIR is high, data flows from A bus to B bus. This bidirectional control enables flexible bus arbitration in multiprocessor or modular systems without external logic. The SN74ABT640DWRE4 implements inverted data transmission regardless of DIR state, meaning output logic levels are complements of inputs.
Can SN74ABT640DWRE4 operate at 3.3 V?
No, SN74ABT640DWRE4 is specified only for 4.5 V to 5.5 V operation per its recommended operating conditions. Attempting 3.3-V supply risks undefined logic thresholds, reduced noise margins, and potential failure to meet timing or drive specifications. For 3.3-V systems, consider SN74LVC245APWRE4 or other LVC-family transceivers explicitly rated for that voltage range.
How should OE be connected for reliable power-up behavior in SN74ABT640DWRE4?
To ensure high-impedance outputs during power-up or power-down, OE on the SN74ABT640DWRE4 must be tied to VCC through a pullup resistor. The minimum resistor value depends on the driver's current-sinking capability; TI recommends values ≥ 10 kΩ for typical microcontroller GPIOs. Floating OE is prohibited - it may cause bus contention or excessive ICC until stable logic levels are established.
What is the maximum capacitive load SN74ABT640DWRE4 can drive while meeting timing specs?
The SN74ABT640DWRE4 switching characteristics (e.g., tPLH ≤ 4.9 ns) are characterized with CL = 50 pF. While higher capacitance can be driven - especially given its 64-mA IOL - propagation delays increase linearly with load. For designs exceeding 50 pF, empirical validation is required; layout best practices (short traces, ground planes, local decoupling) are essential to maintain timing integrity with the SN74ABT640DWRE4.
Is SN74ABT640DWRE4 RoHS compliant and lead-free?
Yes, SN74ABT640DWRE4 is RoHS compliant and features a NIPDAU (nickel-palladium-gold) lead finish, as confirmed in TI's official packaging addendum. It meets JEDEC MSL Level-1 rating with unlimited floor life at ≤30°C/60% RH, and is qualified for lead-free reflow up to 260°C peak temperature - fully compatible with modern Pb-free manufacturing processes.
SN74ABT640DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Transceiver, 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-SOIC
SN74ABT640DWRE4 FAQ
1.How can I place an order for SN74ABT640DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT640DWRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT640DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT640DWRE4 is usually 5 days.
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Once your SN74ABT640DWRE4 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 SN74ABT640DWRE4?
For technical support, including SN74ABT640DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT640DWRE4 requirements.
6.How does Aetrix verify that SN74ABT640DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT640DWRE4 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 SN74ABT640DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ABT640DWRE4?
All SN74ABT640DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT640DWRE4, 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 SN74ABT640DWRE4 part is unused and in its original packaging.
Return procedure for SN74ABT640DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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