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Texas Instruments SN74ABT620N
- Part No.:
- SN74ABT620N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT620N.pdf
- Description:
- IC TXRX INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,380
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Product details
Overview
SN74ABT620N 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 inverted data output, dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), and operates across –40°C to 85°C. It is used in backplane interface logic and legacy system bus isolation.
For engineers reviewing the SN74ABT620N datasheet, SN74ABT620N pinout, SN74ABT620N application, or SN74ABT620N equivalent, key selection criteria include 3-state control timing (tPZH/tPLZ < 5.8 ns), bus-isolation behavior under dual-OE activation, thermal performance in PDIP (θJA = 67°C/W), and compatibility with 5-V TTL input thresholds (VIH = 2 V, VIL = 0.8 V).
Technical Context
The SN74ABT620N implements a dual-control 3-state transceiver architecture where OEAB enables A→B transmission and OEBA enables B→A transmission - both must be low for bidirectional pass-through. Its EPIC-II™ BiCMOS process delivers low ground bounce (VOLP < 1 V) and latch-up immunity (>500 mA per JESD17).
It supports data storage via simultaneous OEAB and OEBA assertion, holding both A and B bus states at high impedance when external drivers are inactive. Power-up safety requires OEBA tied to VCC via pullup and OEAB to GND via pulldown to guarantee initial high-impedance outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation under 5-V rail tolerance and noise margin. |
| 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 sub-5-ns propagation for high-speed bus arbitration in legacy computing systems. |
| VIH / VIL | 2 V / 0.8 V - matches standard TTL logic thresholds for seamless integration into 5-V digital backplanes. |
| θJA (PDIP) | 67°C/W - defines thermal derating limit for continuous operation in enclosed industrial enclosures. |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 Class 3015 for handling reliability in manual assembly environments. |
| Operating Temp | –40°C to 85°C - qualified for commercial/industrial temperature range, excluding extended military use. |
Pinout & Package
SN74ABT620N uses a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at top-left corner (quadrant Q1) with notch orientation marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEAB | Output-enable for A→B direction; active-low - asserts A-bus data onto B-bus when low. |
| 2–9 | A1–A8 | Input/output port A - carries inverted data from B bus when OEAB active, or drives B bus when enabled. |
| 10 | GND | Ground reference - required for stable biasing of BiCMOS output stages and ESD protection network. |
| 11 | VCC | Positive supply - powers internal logic and high-drive output buffers; decoupling capacitor mandatory. |
| 12 | OEBA | Output-enable for B→A direction; active-low - asserts B-bus data onto A-bus when low. |
| 13–20 | B1–B8 | Input/output port B - carries inverted data from A bus when OEBA active, or drives A bus when enabled. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted data path | Outputs present logical complement of inputs - simplifies polarity-matching in differential or complementary bus architectures. |
| Dual independent OE control | OEAB and OEBA operate separately - enables asymmetric bus gating (e.g., A→B only while B bus remains isolated). |
| Bus-hold storage mode | Simultaneous OEAB + OEBA low holds both A and B bus states - eliminates need for external latches in temporary data retention. |
| High-drive BiCMOS outputs | 64-mA sink current supports fan-out to ≥10 standard TTL loads - reduces need for intermediate buffer stages. |
| Low ground bounce | VOLP < 1 V at 5 V/25°C - minimizes switching noise coupling into shared ground planes in dense PCB layouts. |
Applications
| Legacy Computer Backplane Interface | Industrial PLC I/O Expansion Module |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and peripheral cards in ISA or VME-style backplanes. IC Role / Device Role / Timing Role: Bus transceiver managing address/data multiplexing with precise 3-state timing control during bus arbitration cycles. Use Value: Enables deterministic bus turnaround with tPLZ/tPHZ < 5.8 ns, preventing contention during direction switching in synchronous backplane protocols. |
Use Scenario: Isolating field I/O bus from controller bus in modular programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Direction-controlled isolator that blocks noise and fault currents between zones while allowing controlled data flow. Use Value: Dual OE inputs allow software-controlled bus partitioning; high ESD rating (>2 kV HBM) protects against field-induced transients in factory environments. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition Subsystem |
Use Scenario: Driving stimulus signals onto DUT bus while monitoring response on same physical lines using time-multiplexed access. IC Role / Device Role / Timing Role: Inverting transceiver providing signal inversion and drive strength matching for test vector generation. Use Value: Inverted output simplifies pattern generation logic; 64-mA drive ensures clean edge integrity into 50-Ω terminated test fixtures. |
Use Scenario: Interfacing ARINC 429 receiver logic to a central processor bus in line-replaceable units (LRUs). IC Role / Device Role / Timing Role: Level-shifting and buffering interface between legacy avionics serial receivers and 5-V parallel data buses. Use Value: Qualified for –40°C to 85°C operation meets DO-160 environmental requirements; PDIP package supports conformal coating for moisture resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Non-inverting data path; identical pinout, voltage, and drive specs. | Used where signal polarity preservation is required (e.g., memory bus extensions). | Select when inverted output of SN74ABT620N conflicts with downstream logic polarity assumptions. |
| SN74LVC245APW | 3.3-V CMOS operation; lower drive (–24 mA / 24 mA); different pinout (TSSOP-20). | Targets modern low-voltage embedded systems; not drop-in compatible with 5-V designs. | Choose only for new 3.3-V designs requiring lower power; requires PCB redesign and level-shifting if interfacing with 5-V buses. |
Compared with SN74ABT245N, SN74ABT620N provides polarity inversion critical for certain bus arbitration schemes; compared with SN74LVC245APW, it maintains full 5-V TTL compatibility and higher drive strength but consumes more static current and lacks 3.3-V operation.
Availability
SN74ABT620N is available at Aetrix Electronics and suitable for legacy system repair, industrial control retrofitting, and aerospace depot maintenance requiring stable component supply and long-term traceability.
Supply support for SN74ABT620N 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 innovation in industrial and automotive electronics.
The SN74ABT620N belongs to TI's ABT-series advanced bi-directional bus transceivers, engineered for high-noise-immunity, high-drive 5-V TTL system interconnects in legacy computing and industrial infrastructure.
FAQ
What is the function of OEAB and OEBA pins on the SN74ABT620N?
The OEAB pin enables data transmission from the A bus to the B bus when low; OEBA enables transmission from the B bus to the A bus when low. Both can be asserted simultaneously to store bus states. The SN74ABT620N requires OEBA pulled up to VCC and OEAB pulled down to GND at power-up to ensure safe high-impedance initialization.
Does the SN74ABT620N support 3.3-V operation?
No, the SN74ABT620N is specified only for 4.5 V to 5.5 V operation and is not rated for 3.3-V supply. Attempting to operate the SN74ABT620N below 4.5 V may result in undefined logic levels, increased propagation delay, or failure to meet output drive specifications.
Is the SN74ABT620N pin-compatible with the SN74ABT245N?
Yes, the SN74ABT620N and SN74ABT245N share identical 20-pin PDIP (N) package pinout and electrical specifications except for data inversion - the SN74ABT620N inverts data while the SN74ABT245N does not. This makes them mechanically interchangeable but functionally distinct.
What is the maximum output current the SN74ABT620N can sink per pin?
The SN74ABT620N can sink up to 64 mA per output pin under recommended operating conditions (VCC = 4.5 V, TA = 25°C). This value decreases slightly at temperature extremes and higher supply voltages; absolute maximum rating is 128 mA, but sustained operation above 64 mA risks thermal overload in PDIP packaging.
How does the SN74ABT620N handle power-up sequencing?
The SN74ABT620N has no internal power-on reset; external biasing is required. OEBA must be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor to force all outputs into high-impedance state before logic stabilization. This prevents bus contention during power ramp-up, a critical requirement explicitly stated in the SN74ABT620N datasheet.
SN74ABT620N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT620N FAQ
1.How can I place an order for SN74ABT620N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT620N 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 SN74ABT620N reliable?
The price and inventory of SN74ABT620N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT620N is usually 5 days.
3.What payment methods are accepted for SN74ABT620N?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT620N?
SN74ABT620N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT620N 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 SN74ABT620N?
For technical support, including SN74ABT620N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT620N requirements.
6.How does Aetrix verify that SN74ABT620N is sourced from the original manufacturer or authorized distributors?
All SN74ABT620N 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 SN74ABT620N meets industry standards.
7.What is the process for return or replacement of SN74ABT620N?
All SN74ABT620N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT620N, 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 SN74ABT620N part is unused and in its original packaging.
Return procedure for SN74ABT620N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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