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Texas Instruments SN74ABT640DWR
- Part No.:
- SN74ABT640DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT640DWR.pdf
- Description:
- IC TXRX INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
SN74ABT640DWR 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 direction control (DIR), output-enable (OE), high-drive capability (–32 mA IOH / 64 mA IOL), low ground bounce (<1 V VOLP), and operates from –40°C to 85°C.
For engineers reviewing the SN74ABT640DWR datasheet, SN74ABT640DWR pinout, SN74ABT640DWR application, or SN74ABT640DWR equivalent, key selection criteria include 3-state bus isolation timing (tPLZ ≤ 5.5 ns), BiCMOS power efficiency, ESD robustness (>2000 V HBM), and SOIC-20 package compatibility with legacy 5-V board designs.
Technical Context
The SN74ABT640DWR implements an active-high DIR input to select data flow direction (A→B or B→A) and an active-low OE input to place all outputs in high-impedance state. Its EPIC-IIB BiCMOS architecture enables fast switching while reducing static power versus standard bipolar TTL.
It supports true 3-state bus isolation with guaranteed VOH ≥ 2.0 V at –32 mA and VOL ≤ 0.55 V at 64 mA under 4.5–5.5 V supply, and includes latch-up immunity exceeding 500 mA per JESD-17. Input thresholds comply with TTL logic levels (VIH = 2.0 V min, VIL = 0.8 V max).
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) - Enables sub-5-ns propagation for high-speed bus arbitration. |
| tPZL / tPLZ | 1.3 ns (min) to 7.3 ns (max) - Guarantees rapid bus release and acquisition during direction switching. |
| VIH / VIL | 2.0 V / 0.8 V - Fully compatible with standard TTL input thresholds for seamless integration. |
| ESD Rating | >2000 V HBM - Protects against handling damage in manual assembly and field service. |
| Operating Temp | –40°C to +85°C - Qualified for commercial and industrial ambient environments. |
Pinout & Package
SN74ABT640DWR uses a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013 outline. Pin 1 is located at the top-left corner with quadrants assigned per TI tape-and-reel specification (Q1 orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: Low = B→A, High = A→B; TTL-compatible input with ±1 µA leakage. |
| 2–9 | A1–A8 | Input/output port A: Bidirectional data lines with 3-state control via OE and DIR. |
| 10 | GND | Ground reference for all internal circuitry and output drivers. |
| 11 | VCC | Positive supply (4.5–5.5 V); powers BiCMOS output stage and input buffers. |
| 12–19 | B1–B8 | Input/output port B: Mirrored bidirectional data lines synchronized with DIR/OE logic. |
| 20 | OE | Output enable: Active-low; forces all A/B pins into high-impedance when high. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces quiescent ICC to ≤250 µA (disabled) vs. >10 mA in legacy bipolar TTL transceivers. |
| High-Drive Outputs | –32 mA source / 64 mA sink capability eliminates need for external line drivers in backplane interfaces. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V ensures signal integrity during simultaneous output switching. |
| Bus Isolation Control | OE and DIR inputs allow independent management of data flow direction and bus contention prevention. |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - prevents destructive latch-up during transient overvoltage events. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing microcontroller local bus to extended ISA-style peripheral backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling CPU-to-peripheral and peripheral-to-CPU data transfers under DIR/OE control. Use Value: 4.9 ns max tPHL/tPLH and 64 mA IOL drive 10+ TTL loads directly, eliminating buffer stages and reducing PCB layer count. |
Use Scenario: Upgrading aging 8-bit embedded controllers with new peripherals while retaining original 5-V bus architecture. IC Role / Device Role / Timing Role: Level-shifting and bus-isolating transceiver that maintains full TTL compatibility without redesigning timing margins. Use Value: VIH/VIL thresholds match legacy TTL, and SOIC-20 footprint allows drop-in replacement of SN74LS640 or similar devices. |
| Test Equipment Data Path | Programmable Logic Interconnect |
|
Use Scenario: Routing parallel test vectors between FPGA-based pattern generator and DUT interface board in ATE systems. IC Role / Device Role / Timing Role: Direction-controlled data conduit synchronizing stimulus delivery and response capture on shared bus lines. Use Value: Sub-5 ns disable/enable times (tPZL/tPLZ) support precise timing windows for vector sequencing and response sampling. |
Use Scenario: Connecting CPLD I/O banks to external memory or display controllers in space-constrained industrial HMIs. IC Role / Device Role / Timing Role: 3-state bus buffer managing contention between multiple programmable logic devices sharing common data lanes. Use Value: High noise immunity (100 mV hysteresis) and 2000 V HBM ESD rating ensure reliability in electrically noisy factory-floor environments. |
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 |
|---|---|---|---|
| SN74LVC640A | 3.3-V only operation (1.65–3.6 V), lower drive (–24/24 mA), CMOS input thresholds. | Requires level translation for 5-V systems; unsuitable for direct SN74ABT640DWR replacement without voltage adaptation. | Select only for new 3.3-V designs where power efficiency outweighs 5-V compatibility. |
| SN74ABT245 | Octal non-inverting transceiver (vs. inverting logic in SN74ABT640), identical SOIC-20 package and 5-V specs. | Matches pinout and electrical behavior except data inversion; requires firmware or logic adjustment if inversion is critical. | Preferred for new designs needing non-inverting data path; verified pin-compatible with same thermal profile (θJA = 97°C/W). |
Compared with SN74ABT640DWR, SN74LVC640A reduces power but sacrifices 5-V interoperability, while SN74ABT245 offers identical packaging and drive strength with non-inverting functionality-making it the closest functional alternative for drop-in upgrades where inversion is not required.
Availability
SN74ABT640DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and test equipment data paths requiring stable component supply, long-term lifecycle support, and SOIC-20 footprint consistency.
Supply support for SN74ABT640DWR 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 industry-standard logic families.
The ABT logic family-including SN74ABT640DWR-is engineered for high-speed, low-noise 5-V TTL-compatible bus interfacing in industrial, computing, and instrumentation applications.
FAQ
What is the function of the DIR pin on the SN74ABT640DWR?
The DIR (direction-control) pin on the SN74ABT640DWR determines data flow direction: when DIR is low, data transfers from B bus to A bus; when high, data flows from A bus to B bus. It operates at TTL-compatible voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and exhibits ±1 µA input leakage at 25°C. This pin enables dynamic reconfiguration of bidirectional data paths without changing PCB routing.
Can SN74ABT640DWR operate at 3.3 V?
No, SN74ABT640DWR is specified only for 4.5 V to 5.5 V supply operation. Its input thresholds, output drive strength, and internal BiCMOS structure are optimized for 5-V TTL compatibility. Attempting 3.3-V operation results in undefined logic states, insufficient VOH, and potential failure to meet timing specifications. For 3.3-V systems, consider SN74LVC640A instead.
What is the recommended power-up sequence for SN74ABT640DWR?
To ensure all outputs remain in high-impedance during power-up, tie OE to VCC through a pullup resistor (minimum value determined by driver sink capability). DIR may be left floating only if externally controlled before VCC stabilizes; however, TI recommends biasing DIR to a defined state (e.g., via pullup/pulldown) to prevent metastability. No sequencing between VCC and GND is required beyond standard 5-V supply ramp rates.
Does SN74ABT640DWR support hot insertion?
SN74ABT640DWR is not explicitly qualified for hot insertion, but its absolute maximum ratings (–0.5 V to 7 V on inputs/outputs, 5.5 V on VCC) and 2000 V HBM ESD protection provide margin for controlled live-insertion scenarios. For guaranteed hot-swap operation, external protection circuitry (e.g., series resistors, TVS diodes) and power-rail sequencing are recommended. Always verify system-level stress limits before deployment.
What is the thermal resistance (θJA) of SN74ABT640DWR in its SOIC-20 package?
The SN74ABT640DWR in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (θJA) of 97°C/W, measured per JEDEC Std JESD51 with standard PCB mounting conditions. This value assumes a two-layer board with 1 in² copper pour under the package. Derating is required above 70°C ambient; maximum junction temperature must not exceed 150°C under worst-case power dissipation.
SN74ABT640DWR 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:
- Active
- 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
SN74ABT640DWR FAQ
1.How can I place an order for SN74ABT640DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT640DWR 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 SN74ABT640DWR reliable?
The price and inventory of SN74ABT640DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT640DWR is usually 5 days.
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SN74ABT640DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT640DWR 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 SN74ABT640DWR?
For technical support, including SN74ABT640DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT640DWR requirements.
6.How does Aetrix verify that SN74ABT640DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT640DWR 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 SN74ABT640DWR meets industry standards.
7.What is the process for return or replacement of SN74ABT640DWR?
All SN74ABT640DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT640DWR, 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 SN74ABT640DWR part is unused and in its original packaging.
Return procedure for SN74ABT640DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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