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Texas Instruments SN74ABT646ADWG4
- Part No.:
- SN74ABT646ADWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT646ADWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,848
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Product details
Overview
SN74ABT646ADWG4 from Texas Instruments is a 16-bit bus transceiver with dual D-type registers, direction control (DIR), output enable (OE), and clocked multiplexing (CLKAB/CLKBA, SAB/SBA). It delivers high-drive outputs (−32 mA IOH, 64 mA IOL), supports partial-power-down via Ioff, and operates at up to 125 MHz for bidirectional data routing in industrial backplane and memory interface applications.
For engineers reviewing the SN74ABT646ADWG4 datasheet, SN74ABT646ADWG4 pinout, SN74ABT646ADWG4 application, or SN74ABT646ADWG4 equivalent, key selection criteria include its 24-pin SOIC-DW package, 4.5–5.5 V supply range, real-time/stored data transfer modes, and Ioff-enabled isolation during power sequencing.
Technical Context
The SN74ABT646ADWG4 integrates two independent 8-bit register banks (A1–A8 and B1–B8), edge-triggered clocks (CLKAB/CLKBA), and select-control inputs (SAB/SBA) to enable four bus-management functions: real-time A→B/B→A transfer, storage from either bus, and simultaneous output of stored data to A and/or B. Its DIR input determines data flow direction when OE is active low.
It implements true bidirectional isolation: when OE is high, both A and B ports enter high-impedance state while internal registers retain stored data. The Ioff circuitry ensures ≤±100 µA leakage at VCC = 0 V, preventing backflow during partial power-down - critical for hot-swap and mixed-voltage system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL logic rails and tolerant of ±5% regulation variation. |
| Max Clock Frequency | 125 MHz - enables high-speed synchronous data transfer between buses without external timing constraints. |
| Output Drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., long traces, multiple inputs) without signal degradation. |
| Ioff Current | ≤±100 µA at VCC = 0 V - prevents damaging current flow during power-down sequencing in multi-rail systems. |
| Propagation Delay | tPLH/tPHL ≤ 5.6 ns (CL = 50 pF) - ensures sub-6-ns timing margins for 125-MHz operation with tight setup/hold windows. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-level ESD robustness requirements for board-level handling and field deployment. |
| Operating Temp | −40°C to +85°C - qualified for extended-temperature industrial environments including factory automation and telecom infrastructure. |
Pinout & Package
SN74ABT646ADWG4 uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27-mm pitch, and standard JEDEC MO-048 footprint. Pin 1 is located at the top-left corner with notch or index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4–9, 13–20 | A1–A8, B1–B8 I/O | Bidirectional data terminals for two 8-bit buses; internally isolated when OE high or direction disabled. |
| 10, 12 | CLKAB, CLKBA | Low-to-high edge-triggered clocks for latching data into A or B registers respectively. |
| 11, 22 | SAB, SBA | Select controls enabling real-time or stored data routing between buses under DIR/OE control. |
| 3, 21 | DIR, OE | DIR sets data flow direction (A→B or B→A); OE enables/disables all outputs (high-Z when high). |
| 23, 24 | VCC, GND | Power and ground pins - require local 0.1-µF ceramic decoupling per supply pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit registered transceivers | Enables independent capture and forwarding of A- and B-bus data on separate clock edges - essential for asynchronous bus bridging. |
| Ioff partial-power-down support | Allows safe insertion/removal in live backplanes by disabling outputs and blocking reverse current when VCC = 0 V. |
| High-noise-margin TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable interfacing with legacy 5-V CMOS and TTL logic families. |
| Ground bounce <1 V (VCC = 5 V) | Minimizes switching noise on shared ground planes, reducing risk of false triggering in adjacent high-speed circuits. |
| Four-mode bus management | Supports real-time pass-through, register storage, isolated hold, and multiplexed output - eliminates need for discrete glue logic. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Bidirectional data routing between CPU and peripheral modules across a 5-V backplane with hot-swap capability. IC Role / Device Role / Timing Role: Bus transceiver with registered storage acts as timing-isolated bridge, synchronizing asynchronous module clocks using CLKAB/CLKBA. Use Value: Ioff protection prevents damage during card insertion; 125-MHz throughput supports high-bandwidth sensor data aggregation. | Use Scenario: Extending address/data bus width between microcontroller and parallel SRAM/Flash in embedded control systems. IC Role / Device Role / Timing Role: Direction-controlled transceiver buffers and registers memory access signals, decoupling timing between controller and slower memory devices. Use Value: −32 mA/64 mA drive strength maintains signal integrity across 10+ inch PCB traces; OE-controlled isolation prevents bus contention during reset. |
| Test Equipment Data Acquisition | Legacy System Protocol Translation |
Use Scenario: Capturing parallel digital waveform data from DUTs and forwarding to FPGA-based processing engine with precise timestamp alignment. IC Role / Device Role / Timing Role: Dual-register architecture stores incoming samples on CLKAB edge and forwards them on CLKBA edge - enabling deterministic latency control. Use Value: Sub-6-ns propagation delay ensures nanosecond-level timing correlation; 2000-V HBM withstands lab ESD events during probe contact. | Use Scenario: Interfacing modern 5-V microcontrollers with legacy 5-V peripherals using non-standard handshaking protocols requiring data staging. IC Role / Device Role / Timing Role: SAB/SBA-selectable multiplexer routes either live or previously captured bus states - emulating custom protocol handshake sequences. Use Value: Four-mode operation replaces multiple discrete latches and gates; DIR/OE logic simplifies firmware-driven bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | Octal (8-bit), no internal registers; lacks CLKAB/CLKBA, SAB/SBA, and DIR-controlled dual-bus storage. | Only supports basic directional pass-through; cannot store or multiplex data between buses. | Choose when only simple level-shifting or bus buffering is needed - not for registered or multiplexed operation. |
| SN74LVTH16646DL | 16-bit, 3.3-V supply (3.0–3.6 V), LVTH logic family; lower drive (−32 mA/64 mA same, but at 3.3 V), no Ioff. | Designed for mixed-voltage 3.3-V systems; incompatible with 5-V-only environments and lacks power-down isolation. | Choose for 3.3-V domains requiring lower power; avoid where 5-V compatibility or hot-swap safety is required. |
Compared with SN74ABT245DW and SN74LVTH16646DL, the SN74ABT646ADWG4 uniquely combines 16-bit bidirectional registered transfer, 5-V operation, Ioff safety, and four-mode bus control - making it irreplaceable for complex industrial bus management where timing isolation and power sequencing resilience are mandatory.
Availability
SN74ABT646ADWG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and test equipment data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for SN74ABT646ADWG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74ABT646ADWG4 belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interfacing with robust noise immunity and power sequencing safety - targeting industrial control, instrumentation, and legacy-system integration.
FAQ
What is the maximum clock frequency supported by the SN74ABT646ADWG4?
The SN74ABT646ADWG4 supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is validated across the full industrial temperature range (−40°C to +85°C) with timing margins that ensure reliable register capture and output propagation at high speed.
Does the SN74ABT646ADWG4 support partial-power-down operation?
Yes, the SN74ABT646ADWG4 includes Ioff circuitry that disables outputs and limits leakage current to ≤±100 µA when VCC = 0 V. This feature enables safe partial-power-down in multi-rail systems and protects against backflow current during hot-swap events - a key requirement for industrial backplane designs.
What package type is used for the SN74ABT646ADWG4?
The SN74ABT646ADWG4 is packaged in a 24-pin SOIC (DW) with 300-mil body width and 1.27-mm lead pitch. It complies with JEDEC MO-048 and is RoHS-compliant with NiPdAu lead finish, rated MSL Level-1 for unlimited floor life at 260°C peak reflow.
How does the direction control (DIR) pin function in the SN74ABT646ADWG4?
The DIR pin determines data flow direction when OE is low: DIR = low enables real-time or stored data transfer from B bus to A bus; DIR = high enables transfer from A bus to B bus. DIR has no effect when OE is high - both buses remain in high-impedance state regardless of DIR state.
Can the SN74ABT646ADWG4 operate with a 3.3-V supply?
No, the SN74ABT646ADWG4 is specified only for 4.5–5.5 V operation. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive characteristics are optimized for 5-V TTL compatibility. For 3.3-V systems, consider TI's LVTH or LVC families such as SN74LVTH16646DL - but note those lack Ioff and 5-V tolerance.
SN74ABT646ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Transceiver, Non-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:
- 24-SOIC
SN74ABT646ADWG4 FAQ
1.How can I place an order for SN74ABT646ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT646ADWG4 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 SN74ABT646ADWG4 reliable?
The price and inventory of SN74ABT646ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT646ADWG4 is usually 5 days.
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Once your SN74ABT646ADWG4 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 SN74ABT646ADWG4?
For technical support, including SN74ABT646ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT646ADWG4 requirements.
6.How does Aetrix verify that SN74ABT646ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT646ADWG4 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 SN74ABT646ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT646ADWG4?
All SN74ABT646ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT646ADWG4, 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 SN74ABT646ADWG4 part is unused and in its original packaging.
Return procedure for SN74ABT646ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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