My Inquiry
My Account
Texas Instruments SN74ABT640PW
- Part No.:
- SN74ABT640PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT640PW.pdf
- Description:
- IC TXRX INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:116
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT640PW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses. 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. Used in legacy backplane and board-to-board communication interfaces.
For engineers reviewing the SN74ABT640PW datasheet, SN74ABT640PW pinout, SN74ABT640PW application, or SN74ABT640PW equivalent, this page delivers verified electrical specs, TSSOP-20 package details, direction-control logic behavior, thermal resistance (θJA = 128°C/W), and direct alternatives for bus isolation upgrades.
Technical Context
The SN74ABT640PW implements EPIC-II™ BiCMOS logic architecture to achieve low power dissipation while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and robust output drive. Its dual-control interface uses DIR to select data flow direction (A→B or B→A) and OE to enable/disable all outputs simultaneously into high-impedance state.
It supports hot-insertion-safe operation via Ioff protection (±100 µA at VCC = 0 V), withstands >2000-V HBM ESD, and exhibits low ground bounce (VOLP < 1 V). Propagation delays are tightly specified: tPLH/tPHL ≤ 4.9 ns at 5 V, CL = 50 pF, enabling reliable timing in 25-MHz-class parallel bus systems.
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 CMOS logic rails without level-shifting. |
| Output Drive | –32 mA IOH / 64 mA IOL - Delivers sufficient current to drive heavy capacitive loads (e.g., 10+ TTL inputs or long PCB traces). |
| Propagation Delay | 1 ns to 4.9 ns (tPLH/tPHL) - Enables reliable operation in high-speed parallel bus systems up to ~25 MHz clock-equivalent rates. |
| Thermal Resistance | θJA = 128°C/W (TSSOP-20) - Requires moderate airflow or minimal copper pour for sustained full-load operation at 85°C ambient. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883 Method 3015, supporting handling in non-EPA environments during assembly. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and telecom line-card applications. |
| Ioff Protection | ±100 µA at VCC = 0 V - Prevents back-driving and signal contention during partial power-down or hot-swap scenarios. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, thin-profile surface-mount construction optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: Low = B→A data flow; High = A→B data flow - determines inversion path through internal logic. |
| 2–9 | A1–A8 | Input/output port A - bidirectional data lines connected to one bus segment; internally inverted relative to B-side outputs. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling and ground bounce (VOLP < 1 V). |
| 11 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed switching. |
| 12 | OE | Output-enable control: Low = outputs active; High = all outputs in high-impedance state - used for bus arbitration. |
| 13–20 | B1–B8 | Input/output port B - bidirectional data lines connected to second bus segment; inverted relative to A-side inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted bidirectional data path | Ensures signal integrity across mismatched bus impedances by reducing simultaneous switching noise on shared lines. |
| High-drive 3-state outputs | –32 mA source / 64 mA sink capability maintains logic levels under heavy fanout (≥10 TTL loads) without external buffers. |
| EPIC-II™ BiCMOS process | Reduces dynamic power vs. bipolar-only equivalents while preserving speed - typical ICC = 30 mA at full load, 5 V. |
| Hot-swap Ioff protection | Blocks leakage current when VCC = 0 V, preventing unintended biasing of live backplanes during module insertion/removal. |
| Low ground bounce (VOLP) | <1 V at 5 V/25°C - minimizes noise coupling into adjacent analog or clock circuits on mixed-signal PCBs. |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Interfacing a microcontroller local bus to a multi-slot ISA-style backplane carrying multiple peripheral cards. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow direction and isolating segments during DMA cycles or card resets. Use Value: Enables deterministic bus arbitration using DIR/OE controls, prevents contention during hot-plug events via Ioff, and sustains signal integrity over 15-cm trace lengths. |
Use Scenario: Isolating CPU address/data bus from expansion I/O modules in programmable logic controllers (PLCs) with field-replaceable I/O cards. IC Role / Device Role / Timing Role: Octal-level bus buffer providing direction-controlled data mirroring and 3-state isolation during firmware updates or diagnostics. Use Value: Eliminates need for discrete pull-up networks on OE; high-drive outputs maintain valid logic levels despite aging connectors and long ribbon cables. |
| Test Equipment Data Mux | Embedded Instrumentation Bridge |
Use Scenario: Routing sensor data streams between ADC front-end and FPGA processing core in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Synchronized bus transceiver enabling time-aligned capture of parallel 8-bit sensor samples across multiple channels. Use Value: Sub-5 ns propagation delay ensures sample alignment within 100 ps across all eight lanes, critical for phase-coherent measurements. |
Use Scenario: Bridging UART or parallel debug interface between ARM Cortex-M host and legacy 8-bit peripheral subsystem in medical diagnostic hardware. IC Role / Device Role / Timing Role: Level-translating and direction-managed bus interface ensuring protocol-compliant handshaking without software overhead. Use Value: TTL-compatible inputs accept 0.8 V/2.0 V thresholds directly from microcontroller GPIO; no external level shifters required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC640APW | Lower voltage (1.65–3.6 V), CMOS process, ±24 mA drive, higher input capacitance (5 pF vs. 4 pF). | Targets modern low-voltage systems; not pin-compatible due to different DC characteristics and timing margins. | Select when migrating to 3.3-V domains and requiring lower static power; verify timing closure with slower edge rates. |
| 74ACT640PW | Same 5-V operation, but ACT logic family: faster tPLH/tPHL (≤3.5 ns), higher ICC (up to 45 mA), no Ioff spec. | Better suited for speed-critical backplanes where power and hot-swap safety are secondary concerns. | Choose for maximum speed in fixed-installation systems; avoid in hot-pluggable or partial-power-down architectures. |
Compared with SN74ABT640PW, SN74LVC640APW enables voltage scaling but sacrifices drive strength and industrial temp rating, while 74ACT640PW improves speed at the cost of higher power and reduced fault tolerance - making SN74ABT640PW optimal for balanced 5-V industrial bus isolation.
Availability
SN74ABT640PW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, test equipment data multiplexing, and embedded instrumentation bridges requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT640PW 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 component development.
The SN74ABT640PW belongs to TI's ABT logic family - engineered for high-speed, high-drive 5-V bus interfacing in industrial control, telecom infrastructure, and test equipment where reliability and noise immunity are critical.
FAQ
What is the recommended power-up sequence for SN74ABT640PW to ensure proper 3-state initialization?
TI recommends tying OE to VCC via a pullup resistor (minimum value determined by driver sink capability) during power-up and power-down to guarantee high-impedance state before valid logic levels settle. For SN74ABT640PW, a 10-kΩ resistor suffices given its ±1-µA input leakage. This prevents bus contention at power transition edges and is explicitly required in the datasheet to avoid undefined output states during ramp-up.
Does SN74ABT640PW support hot-swap operation, and what design provisions enable it?
Yes, SN74ABT640PW supports hot-swap operation via its Ioff specification: ±100 µA leakage when VCC = 0 V, preventing back-driving of live buses. This feature, combined with its 2000-V HBM ESD rating and latch-up immunity (>500 mA per JESD-17), allows safe insertion into powered backplanes - provided OE is held high until VCC stabilizes and board-level TVS protection is present.
How does the inverted data path of SN74ABT640PW affect system-level timing analysis?
The SN74ABT640PW performs true inversion (A→B and B→A paths both invert), so setup/hold timing must account for the added logic delay - typically adding ≤0.3 ns to tPLH/tPHL versus non-inverting equivalents. TI's datasheet specifies tPLH/tPHL including inversion, so system timing budgets use the published 1–4.9 ns values directly; no additional margin is needed for inversion logic.
Can SN74ABT640PW be used with 3.3-V control signals, and what interface considerations apply?
No - SN74ABT640PW requires 5-V supply and has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), but its inputs are not 3.3-V tolerant. Driving DIR or OE from a 3.3-V MCU requires a level-shifter or resistor-divider network to ensure VI stays within 0–5.5 V absolute max and meets 2.0 V VIH minimum. Direct connection risks marginal switching or increased ICC.
What is the thermal derating guidance for SN74ABT640PW in continuous 64-mA IOL operation?
With θJA = 128°C/W and max junction temperature of 150°C, SN74ABT640PW dissipates ~0.33 W at 64-mA IOL (VOL ≈ 0.55 V). At 25°C ambient, this yields ~42°C rise - well within limit. However, above 65°C ambient, derate IOL linearly: max IOL = 64 mA × (150 − TA)/125. Full drive is sustainable only below 85°C ambient with adequate PCB copper area.
SN74ABT640PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74ABT640PW FAQ
1.How can I place an order for SN74ABT640PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT640PW 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 SN74ABT640PW reliable?
The price and inventory of SN74ABT640PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT640PW is usually 5 days.
3.What payment methods are accepted for SN74ABT640PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT640PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT640PW?
SN74ABT640PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT640PW 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 SN74ABT640PW?
For technical support, including SN74ABT640PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT640PW requirements.
6.How does Aetrix verify that SN74ABT640PW is sourced from the original manufacturer or authorized distributors?
All SN74ABT640PW 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 SN74ABT640PW meets industry standards.
7.What is the process for return or replacement of SN74ABT640PW?
All SN74ABT640PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT640PW, 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 SN74ABT640PW part is unused and in its original packaging.
Return procedure for SN74ABT640PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT640PW Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
