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Texas Instruments SN74ABT5403DWG4
- Part No.:
- SN74ABT5403DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT5403DWG4.pdf
- Description:
- IC BUFFER INVERT 5.5V 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,474
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Product details
Overview
SN74ABT5403 from Texas Instruments is a 12-bit inverting buffer/line driver with 3-state outputs, designed for memory address and bus interface applications in industrial systems operating from –40°C to 85°C. It features 25-Ω integrated series output resistors, ±12 mA drive capability, and dual active-low output-enable inputs (OE1, OE2) controlling all 12 outputs simultaneously.
For engineers reviewing the SN74ABT5403 datasheet, SN74ABT5403 pinout, SN74ABT5403 application, or SN74ABT5403 equivalent, key selection criteria include its BiCMOS EPIC-IIB architecture, low ground bounce (<1 V), undershoot suppression (<0.5 V), and SOIC-28 package compatibility with legacy 5-V TTL bus systems.
Technical Context
This device implements a dual-input AND logic gate for 3-state control: both OE1 and OE2 must be low to enable inverted data transmission from D1–D12 to Y1–Y12. Its BiCMOS design reduces power dissipation versus pure bipolar implementations while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2 V) and rail-to-rail output swing under load.
Each output integrates a 25-Ω series resistor to dampen signal reflections on transmission lines, eliminating external termination components. The device meets JEDEC JESD-17 latch-up immunity (>500 mA) and supports hot-swap safe operation when OE is pulled up to VCC during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across noisy 5-V rail tolerances without level-shifting. |
| Output Drive | ±12 mA - Sustains full logic swing into 50-pF loads with <7 ns propagation delay (tPLH/tPHL). |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2 V - Directly compatible with standard TTL and LVTTL logic families. |
| Output Termination | Integrated 25-Ω series resistor per output - Eliminates need for external source-series termination on PCB traces. |
| Ground Bounce | VOLP < 1 V at VCC = 5 V - Minimizes noise coupling into shared VCC/GND planes during simultaneous switching. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and instrumentation environments. |
| Package Thermal Resistance | θJA = 78°C/W (SOIC-28) - Enables thermal management in high-density board layouts without forced air. |
Pinout & Package
SN74ABT5403 is housed in a 28-pin plastic small-outline integrated circuit (SOIC) package (DW), with 300-mil body width and standard gull-wing lead form. Pin 1 is located at the top-left corner of the top view, marked by a beveled edge or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6, 8–13, 15–16 | Y1–Y12 (inverted outputs) | 12 buffered, inverted, 3-state outputs with integrated 25-Ω series resistance for EMI reduction. |
| 14, 15 | OE1, OE2 (output enables) | Active-low AND-gated control: both must be low to enable outputs; either high forces high-impedance state. |
| 17–28 | D1–D12 (data inputs) | 12 TTL-compatible inputs accepting 0.8 V / 2 V thresholds; inverted internally before output. |
| 7 | GND | Power ground reference for all I/O and internal logic; requires low-inductance connection to system ground plane. |
| 20 | VCC | 5-V supply input; bypass capacitor (0.1 µF ceramic) required within 10 mm of this pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Reduces static power consumption by >50% versus equivalent bipolar TTL drivers while retaining speed. |
| Integrated 25-Ω output resistors | Enables clean signal edges on unterminated 50-Ω PCB traces without discrete components or layout overhead. |
| Low ground bounce (VOLP) | Stabilizes shared power rails during multi-bit switching, critical for mixed-signal systems with ADCs/DACs. |
| Latch-up immunity >500 mA | Meets JEDEC JESD-17 for robustness against transient overcurrent events in industrial environments. |
| Hot-swap ready OE biasing | OE pins tolerate floating states during power-up/down; pull-up to VCC ensures defined high-Z default. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 12-bit address lines from a microcontroller to SRAM or Flash memory in an industrial PLC. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from memory array; enables shared bus access with other peripherals. Use Value: Integrated 25-Ω resistors suppress ringing on 10-cm address traces, reducing timing margin loss and enabling reliable 20-MHz operation. |
Use Scenario: Bidirectional data bus isolation between an FPGA and legacy parallel peripheral (e.g., LCD controller or EEPROM). IC Role / Device Role / Timing Role: Direction-controlled line driver providing inverted data path with fast enable/disable (tPZH = 2.5 ns min) for cycle-accurate handshaking. Use Value: Dual OE inputs allow synchronous gating of all 12 bits, eliminating skew-induced bus contention during direction changes. |
| Clock Distribution Network | Industrial I/O Expansion |
|
Use Scenario: Fan-out of a 5-V system clock to multiple synchronous logic blocks (e.g., counters, shift registers) in test equipment. IC Role / Device Role / Timing Role: Low-skew inverting clock buffer with matched propagation delays (tPLH/tPHL variation <1.5 ns) across all 12 outputs. Use Value: Tight delay matching ensures setup/hold compliance across 12 downstream devices, supporting 100-MHz clock distribution. |
Use Scenario: Expanding GPIO count of a microcontroller to drive 12 discrete indicators (LEDs, relays) or read 12 panel switches in factory HMIs. IC Role / Device Role / Timing Role: High-current (12 mA sink/source) interface translating MCU logic levels to ruggedized industrial I/O voltages. Use Value: ±12 mA drive capability directly powers LEDs without current-limiting resistors, simplifying BOM and reducing board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Octal (8-bit), non-inverting, same SOIC-20 package; lacks integrated 25-Ω resistors. | Suitable for shorter trace lengths or where inversion is not required; lower pin count limits channel density. | Select when fewer bits are needed and board space is constrained; requires external termination for long traces. |
| SN74LVC125APW | Quad (4-bit), non-inverting, 3.3-V only (1.65–3.6 V); no integrated series resistors; LVCMOS input thresholds. | Designed for modern low-voltage systems; incompatible with 5-V TTL buses without level translation. | Choose for new 3.3-V designs prioritizing ultra-low power; not a drop-in replacement for 5-V SN74ABT5403 systems. |
Compared with SN74ABT244N and SN74LVC125APW, the SN74ABT5403 uniquely delivers 12-bit inverted buffering with built-in 25-Ω termination in a single 5-V TTL-compatible SOIC-28 package-making it optimal for legacy industrial bus upgrades requiring minimal layout change and guaranteed signal integrity.
Availability
SN74ABT5403 is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy bus interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ABT5403 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 experience in industrial and automotive-grade IC design.
The ABT logic family-including SN74ABT5403-is engineered for high-speed, low-noise 5-V TTL bus interfacing in mission-critical industrial equipment, emphasizing signal integrity, latch-up immunity, and thermal reliability.
FAQ
What is the function of the dual OE inputs on the SN74ABT5403?
The SN74ABT5403 uses OE1 and OE2 as active-low inputs connected via an internal AND gate. Both must be low to enable the 12 inverted outputs; if either is high, all outputs enter high-impedance state. This allows flexible control-such as using one OE for system-level enable and the other for local subsystem gating-without external logic. The SN74ABT5403 thus provides deterministic bus isolation under diverse control conditions.
Does the SN74ABT5403 require external series resistors for EMI suppression?
No. The SN74ABT5403 integrates a precise 25-Ω series resistor on each of its 12 outputs, specifically designed to dampen signal reflections on typical PCB traces. This eliminates the need for 12 discrete 0402 or 0603 resistors, reducing BOM cost, assembly steps, and board area. The SN74ABT5403's internal termination maintains signal fidelity up to 100 MHz on 50-Ω controlled-impedance lines.
Can the SN74ABT5403 operate reliably at 4.5 V supply voltage?
Yes. The SN74ABT5403 is fully specified from 4.5 V to 5.5 V, with guaranteed performance including ±12 mA drive strength, 0.8 V/2 V input thresholds, and sub-7 ns propagation delays at VCC = 4.5 V. Its BiCMOS EPIC-IIB process ensures stable operation even at the lower rail limit, making the SN74ABT5403 suitable for systems with marginal 5-V regulation or brownout conditions.
How does the SN74ABT5403 handle power-up sequencing to avoid bus contention?
The SN74ABT5403 enters high-impedance state when either OE1 or OE2 is high. To ensure safe power-up, TI recommends tying both OE pins to VCC through a pullup resistor (value determined by driver sink capability). This guarantees all outputs remain in high-Z until firmware actively drives OE low-preventing unintended data corruption on shared buses. The SN74ABT5403's design inherently supports this robust initialization sequence.
Is the SN74ABT5403 pin-compatible with older 74-series TTL buffers like the 74LS540?
No. While functionally similar as 12-bit inverting 3-state buffers, the SN74ABT5403 uses a 28-pin SOIC (DW) package with distinct pin mapping-including separate OE1/OE2 inputs and split VCC/GND placements-unlike the 20-pin DIP/SOIC packages of 74LS540. Board redesign is required. The SN74ABT5403 offers superior specs (lower bounce, integrated termination, BiCMOS efficiency) but is not a mechanical or electrical drop-in for LS-family parts.
SN74ABT5403DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 12
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
SN74ABT5403DWG4 FAQ
1.How can I place an order for SN74ABT5403DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT5403DWG4 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 SN74ABT5403DWG4 reliable?
The price and inventory of SN74ABT5403DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT5403DWG4 is usually 5 days.
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Once your SN74ABT5403DWG4 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 SN74ABT5403DWG4?
For technical support, including SN74ABT5403DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT5403DWG4 requirements.
6.How does Aetrix verify that SN74ABT5403DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT5403DWG4 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 SN74ABT5403DWG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT5403DWG4?
All SN74ABT5403DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT5403DWG4, 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 SN74ABT5403DWG4 part is unused and in its original packaging.
Return procedure for SN74ABT5403DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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