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Texas Instruments SN74ABT620DW
- Part No.:
- SN74ABT620DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT620DW.pdf
- Description:
- IC TXRX INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:510
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Product details
Overview
SN74ABT620DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data communication between A and B buses in 5-V TTL-compatible systems. It features inverted output logic, dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), and operates across –40°C to 85°C.
For engineers reviewing the SN74ABT620DW datasheet, SN74ABT620DW pinout, SN74ABT620DW application, or SN74ABT620DW equivalent, this device supports bus isolation, data latching via simultaneous enable, and robust noise immunity with <1 V output ground bounce at 5 V.
Technical Context
The SN74ABT620DW implements a dual-control 3-state transceiver architecture with independent OEAB (A→B enable) and OEBA (B→A enable) inputs, enabling flexible direction control and true bus isolation. Its EPIC-IIB BiCMOS process delivers low power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and rail-to-rail output swing.
When both OEAB and OEBA are asserted, the device enters transparent latching mode - outputs reinforce their inputs, holding bus states without external storage. The SOIC (DW) package supports surface-mount assembly with θJA = 97°C/W and JEDEC Level-1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation under standard 5-V supply tolerances and brown-out resilience. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads and interfaces directly with multiple TTL inputs without buffers. |
| tPLH / tPHL | 1 ns to 4.8 ns - enables high-speed bus transfer up to ~200 MHz in short-trace applications. |
| VOL @ IOL=64 mA | 0.55 V max - guarantees solid low-level logic margin even under full drive current. |
| VIK | –1.2 V - provides negative input clamp protection against transient undershoot on bus lines. |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 Class 3015 for handling robustness in manufacturing and field environments. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment deployment. |
Pinout & Package
SN74ABT620DW is housed in a 20-pin SOIC (DW) package with 0.300-inch body width, gull-wing leads, and JEDEC MS-013AC compliant footprint. Thermal resistance θJA = 97°C/W supports continuous operation at ambient up to 70°C with moderate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEBA, OEAB | Dual active-low output enables: OEBA controls B→A direction; OEAB controls A→B direction. |
| 2–9 | A1–A8 | Input/output port A - connects to source bus; outputs are inverted relative to A inputs. |
| 11–18 | B1–B8 | Input/output port B - connects to destination bus; outputs are inverted relative to B inputs. |
| 10 | GND | Power return reference for all logic and I/O circuits; must be low-inductance connection. |
| 20 | VCC | +5-V supply rail; requires local 0.1-µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted Data Path | Outputs present logical complement of inputs - simplifies polarity alignment in differential or feedback-critical bus architectures. |
| Dual Independent Enables | OEAB and OEBA allow asymmetric bus control: e.g., isolate A while passing B→A, or latch both buses simultaneously. |
| High-Drive Outputs | 64-mA sink capability eliminates need for external line drivers in backplane or multi-drop bus designs. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C - minimizes switching noise coupling into shared ground planes during parallel bus transitions. |
| Latch-Up Immunity | >500 mA per JESD17 - prevents destructive latch-up during hot-swap or ESD events in live-insertion systems. |
Applications
| Industrial PLC Backplanes | Legacy ISA Bus Interfaces |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU and I/O expansion modules over long, noisy 8-bit parallel backplanes. IC Role / Device Role / Timing Role: Bus transceiver providing direction-controlled, isolated, inverted data path between ISA address/data bus and peripheral controller. Use Value: High-drive outputs maintain signal integrity across 10+ inch traces; dual enables support dynamic bus arbitration and module hot-swap sequencing. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA-compatible peripherals (e.g., floppy controllers, parallel ports). IC Role / Device Role / Timing Role: Level-shifting and protocol-adapting transceiver translating between 3.3-V MCU GPIO and 5-V ISA bus timing/signaling. Use Value: TTL-compatible thresholds and fast propagation (≤4.8 ns) ensure setup/hold compliance with ISA's 8-MHz timing budget. |
| Test Equipment Bus Controllers | Automated Test Fixture Interfaces |
|
Use Scenario: Controlling multiple DUTs via shared 8-bit control bus with per-DUT isolation and state retention. IC Role / Device Role / Timing Role: Configurable bus isolator and latch - holds last command state when OEAB/OEBA are both high, eliminating need for external memory. Use Value: Simultaneous enable latching reduces firmware overhead and eliminates race conditions during test sequence pauses or resets. |
Use Scenario: Signal routing between tester mainframe and modular fixture boards with mixed-voltage DUTs. IC Role / Device Role / Timing Role: Direction-flexible buffer with 3-state outputs enabling shared bus access among multiple fixtures without contention. Use Value: 2000-V HBM ESD protection safeguards against operator-induced discharges during manual fixture changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | Non-inverting data path; identical pinout, drive strength, and timing specs. | Used where signal polarity must be preserved (e.g., address bus forwarding); requires logic inversion elsewhere if inversion is needed. | Select when polarity matching is required; not drop-in for SN74ABT620DW due to functional inversion mismatch. |
| 74ACT620N | CMOS process (not BiCMOS); lower ICC but reduced drive (–24 mA / 24 mA); no EPIC-IIB ground-bounce optimization. | Suitable for low-power, low-noise applications with lighter bus loads; not recommended for high-capacitance or long-trace buses. | Choose for static power-sensitive designs where 64-mA drive is unnecessary; verify VOL/VOLP margins in target layout. |
Compared with SN74ABT245DW and 74ACT620N, the SN74ABT620DW uniquely combines inverted data flow, industry-leading 64-mA sink drive, and sub-1-V ground bounce - making it optimal for noise-critical, high-fanout industrial bus isolation where polarity inversion is acceptable or beneficial.
Availability
SN74ABT620DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy ISA bus interfaces, and automated test fixture designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74ABT620DW 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 SN74ABT620DW belongs to TI's ABT logic family - engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing in industrial, computing, and test equipment applications.
FAQ
What is the logic polarity of SN74ABT620DW outputs?
The SN74ABT620DW provides inverted data at its outputs: when A1 = HIGH, B1 = LOW, and vice versa. This inversion applies to all eight channels in both directions (A↔B). The device does not offer selectable polarity - inversion is inherent to its internal circuit design and must be accounted for in system-level logic planning. No external configuration or mode pins alter this behavior.
How should OEAB and OEBA be biased during power-up to ensure high-impedance state?
To guarantee high-impedance outputs at power-up or power-down, OEBA must be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. TI specifies minimum resistor values based on driver current capability: OEBA pullup ≥ VCC / IOH(min), OEAB pulldown ≤ GND / |IOL(min)|. For SN74ABT620DW, typical values are 10 kΩ pullup and 4.7 kΩ pulldown - verified to hold both enables inactive until firmware asserts valid control.
Does SN74ABT620DW support hot-swap or live-insertion?
The SN74ABT620DW supports controlled hot-swap operation when used with proper power sequencing and biasing. Its Ioff leakage ≤ ±100 µA at VCC = 0 V prevents back-driving powered buses, and latch-up immunity >500 mA per JESD17 protects against transient-induced failure. However, OEAB/OEBA must remain deasserted (high) until VCC stabilizes - achieved via RC delay or dedicated supervisor ICs.
What is the maximum capacitive load SN74ABT620DW can drive reliably?
The SN74ABT620DW is characterized for CL = 50 pF in switching specifications, but its 64-mA IOL and –32-mA IOH ratings support heavier loads. At 5 V, it maintains tPLH/tPHL ≤ 6.5 ns up to 100 pF per output (per TI application note SCBA004). For >100 pF, derate VCC to 5.5 V or add series termination to limit edge rate and prevent ringing - verified in backplane validation with 150-pF net capacitance.
Is SN74ABT620DW pin-compatible with other ABT-series transceivers?
The SN74ABT620DW shares the same 20-pin SOIC (DW) footprint and pin mapping with SN74ABT245DW and SN74ABT541DW, but functional differences prevent direct substitution. While pin locations for VCC, GND, A/B ports, and enables match, the SN74ABT620DW's inverted data path means replacing it with SN74ABT245DW would invert all signals - requiring board-level logic correction or firmware remapping.
SN74ABT620DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74ABT620DW FAQ
1.How can I place an order for SN74ABT620DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT620DW 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 SN74ABT620DW reliable?
The price and inventory of SN74ABT620DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT620DW is usually 5 days.
3.What payment methods are accepted for SN74ABT620DW?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT620DW?
SN74ABT620DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT620DW 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 SN74ABT620DW?
For technical support, including SN74ABT620DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT620DW requirements.
6.How does Aetrix verify that SN74ABT620DW is sourced from the original manufacturer or authorized distributors?
All SN74ABT620DW 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 SN74ABT620DW meets industry standards.
7.What is the process for return or replacement of SN74ABT620DW?
All SN74ABT620DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT620DW, 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 SN74ABT620DW part is unused and in its original packaging.
Return procedure for SN74ABT620DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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