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Texas Instruments SN74ABT640PWR
- Part No.:
- SN74ABT640PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT640PWR.pdf
- Description:
- IC TXRX INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
SN74ABT640 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in TTL-level systems. It features inverted data transmission, ±32-mA high-drive outputs (IOH/–32 mA, IOL/64 mA), operates at 4.5–5.5 V, and is rated for –40°C to 85°C industrial temperature range.
For engineers reviewing the SN74ABT640 datasheet, SN74ABT640 pinout, SN74ABT640 application, or SN74ABT640 equivalent, this device is selected for high-speed bus isolation, level-shifting interconnects, and legacy TTL system expansion where output drive strength, low ground bounce (<1 V VOLP), and direction-controlled 3-state operation are critical.
Technical Context
The SN74ABT640 implements a dual-function control architecture: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its EPIC-IIB BiCMOS process delivers reduced power dissipation versus standard bipolar TTL while maintaining full TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V).
It supports hot-insertion robustness via Ioff protection (±100 µA at VCC = 0 V) and exceeds 2000-V HBM ESD rating. Latch-up immunity exceeds 500 mA per JESD-17, and propagation delays are tightly specified (tPLH/tPHL ≤ 4.9 ns at VCC = 5 V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage backplane designs. |
| Output Drive | –32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to ≥20 standard TTL inputs without buffering. |
| Propagation Delay | tPLH/tPHL ≤ 4.9 ns - Enables reliable operation in 100+ MHz bus systems with tight timing margins. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded controllers, test equipment, and communications infrastructure. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels, eliminating need for level translators in legacy interfaces. |
| Ground Bounce | VOLP < 1 V at VCC = 5 V - Minimizes signal integrity degradation during simultaneous output switching. |
| ESD Rating | ≥2000 V HBM - Provides robust handling tolerance during board assembly and field service. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 7.0 mm × 1.2 mm body, 0.65 mm pitch, lead-free NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19, 20 | DIR, OE, VCC | Direction control (active-H), output enable (active-L), and primary power supply - OE must be pulled up externally for safe power-up isolation. |
| 2–9 | A1–A8 | Input/output port A - Bidirectional data lines connected to one bus segment; driven low/high or tri-stated based on DIR/OE. |
| 11–18 | B1–B8 | Input/output port B - Mirror port for second bus segment; data inverted relative to A-side during transfer. |
| 10 | GND | Signal reference ground - Requires low-inductance connection to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted bidirectional data path | Ensures deterministic polarity alignment when cascading multiple transceivers without external inversion logic. |
| High-current 3-state outputs | –32 mA sink/source capability maintains signal integrity across long traces or high-fanout backplanes. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. bipolar TTL while retaining speed and drive - typical ICC = 30 mA max under load. |
| Power-off protection (Ioff) | Prevents current backflow from live bus to unpowered system section - critical for hot-swap and modular chassis designs. |
| Low ground bounce (VOLP) | <1 V peak ensures stable reference during fast edge transitions - avoids false triggering of downstream receivers. |
Applications
| Industrial Backplane Interface | Legacy System Bus Expansion |
|---|---|
|
Use Scenario: Interfacing a modern microcontroller module to an aging ISA-style backplane carrying 8-bit parallel data. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing direction-controlled, inverted data transfer between CPU and peripheral slots. Use Value: Eliminates need for discrete inverters and buffers; high drive strength drives long backplane traces with minimal skew. |
Use Scenario: Adding memory-mapped I/O expansion to a vintage 8051-based controller using off-board peripherals. IC Role / Device Role / Timing Role: Isolating and translating data between local bus and extended peripheral bus under software-controlled direction. Use Value: OE-driven high-Z state prevents bus contention during reset or firmware update; TTL-compatible thresholds ensure plug-and-play integration. |
| Test Equipment Data Capture | Programmable Logic Interconnect |
|
Use Scenario: Capturing parallel digital signals from DUTs in automated test fixtures with variable bus width requirements. IC Role / Device Role / Timing Role: Configurable bus interface enabling flexible probe-to-instrument data routing via DIR/OE control. Use Value: Sub-5 ns propagation delay supports accurate timestamping of high-speed digital waveforms up to 100 MHz. |
Use Scenario: Connecting FPGA I/O banks to external CPLD-based glue logic operating at TTL voltage levels. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between 3.3-V FPGA outputs and 5-V CPLD inputs. Use Value: Input thresholds match TTL logic, while high drive strength compensates for CPLD input capacitance and trace losses. |
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 | Non-inverting data path; identical voltage, drive, and timing specs. | Used where polarity preservation is required (e.g., direct address/data mirroring without logic inversion). | Select SN74ABT245PW if system design requires non-inverted data flow; otherwise SN74ABT640 remains optimal for inverted-path architectures. |
| 74ACT245PW | CMOS process; lower ICC (max 8 mA), but only ±24 mA drive and no Ioff protection. | Suitable for low-power, low-fanout applications where bus isolation during power-down is not required. | Choose 74ACT245PW only in battery-powered or thermally constrained systems; SN74ABT640 preferred for industrial reliability and drive strength. |
Compared with SN74ABT245PW and 74ACT245PW, the SN74ABT640 uniquely combines inverted data functionality, 64-mA sink capability, and Ioff-enabled hot-swap safety - making it the sole choice for legacy bus expansion requiring polarity inversion and robust fault tolerance.
Availability
SN74ABT640PWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus expansion, and test equipment data capture requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74ABT640PWR 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The ABT logic family - including SN74ABT640 - was engineered for high-speed, high-drive TTL-compatible bus interfacing in industrial control and instrumentation systems where reliability and signal integrity are non-negotiable.
FAQ
What is the function of the DIR pin on the SN74ABT640PWR?
The DIR (direction-control) pin on the SN74ABT640PWR determines data flow direction: when DIR = LOW, data transfers from B bus to A bus; when DIR = HIGH, data flows from A bus to B bus. This bidirectional control enables flexible bus arbitration in master-slave or peer-to-peer architectures without external logic. The SN74ABT640PWR uses active-H DIR, consistent with TI's ABT-series conventions.
Does the SN74ABT640PWR support hot-swap or live-insertion?
Yes, the SN74ABT640PWR supports hot-swap operation due to its Ioff specification (±100 µA at VCC = 0 V), which blocks current flow between powered and unpowered sections of the bus. This feature prevents damage during card insertion/removal in modular systems. The SN74ABT640PWR also meets JEDEC JESD-17 latch-up immunity (>500 mA), further enhancing robustness in live environments.
What is the recommended pull-up resistor value for OE on the SN74ABT640PWR?
Texas Instruments recommends tying OE to VCC via a pull-up resistor to ensure high-impedance state during power-up/down. The minimum resistor value depends on the driver's current-sinking capability; for standard TTL drivers, 4.7 kΩ is typical. For stronger drive sources, values down to 1 kΩ may be used. This configuration guarantees bus isolation before internal logic stabilizes - a critical requirement for the SN74ABT640PWR in fault-tolerant systems.
Can the SN74ABT640PWR operate at 3.3 V?
No, the SN74ABT640PWR is specified only for 4.5 V to 5.5 V operation per its recommended conditions. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL systems. Operating below 4.5 V risks marginal VIH recognition and degraded output swing. For 3.3-V applications, consider TI's LVC or AHC families instead of the SN74ABT640PWR.
How does the SN74ABT640PWR differ from the SN74ABT646?
The SN74ABT640PWR is an octal transceiver with inverted data path and separate DIR/OE controls, whereas the SN74ABT646 is an octal registered transceiver with clocked latching and different pinout. The SN74ABT646 adds storage functionality but lacks the SN74ABT640PWR's pure combinatorial, low-latency bus bridging capability. They are not pin-compatible or functionally interchangeable - the SN74ABT640PWR targets asynchronous real-time interconnect, not synchronized data staging.
SN74ABT640PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ABT640PWR FAQ
1.How can I place an order for SN74ABT640PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT640PWR 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 SN74ABT640PWR reliable?
The price and inventory of SN74ABT640PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT640PWR is usually 5 days.
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SN74ABT640PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT640PWR 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 SN74ABT640PWR?
For technical support, including SN74ABT640PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT640PWR requirements.
6.How does Aetrix verify that SN74ABT640PWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT640PWR 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 SN74ABT640PWR meets industry standards.
7.What is the process for return or replacement of SN74ABT640PWR?
All SN74ABT640PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT640PWR, 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 SN74ABT640PWR part is unused and in its original packaging.
Return procedure for SN74ABT640PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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