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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74ABT32318PN

Name: SN74ABT32318PN
Brand: Texas Instruments
SKU: SN74ABT32318PN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT32318PN

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: SN74ABT32318PN.pdf

Description:: BUS EXCHANGER

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Product details

Overview

SN74ABT32318PN from Texas Instruments is a 54-pin/72-pin (80-pin body) 18-bit triple-port registered I/O bus exchanger with D-type latch and flip-flop functionality, supporting transparent, latched, and clocked data flow modes across three independent 18-bit ports (A/B/C), rated for −40°C to 85°C operation, with 64-mA sink and −32-mA source drive strength at 5 V.

For engineers reviewing the SN74ABT32318PN datasheet, SN74ABT32318PN pinout, SN74ABT32318PN application, or SN74ABT32318PN equivalent, this device serves as a high-speed, high-drive universal bus exchanger enabling real-time data routing between multiple synchronous subsystems in backplane, modular computing, and programmable logic interconnect applications.

Technical Context

The SN74ABT32318PN implements UBE (Universal Bus Exchanger) architecture using EPIC-II^B BiCMOS process, integrating combinational select logic with edge-triggered and level-sensitive storage elements per port. Each port supports independent control via dedicated CLK, LE, SEL, and OE inputs.

Its distributed V_CC/GND pin configuration minimizes simultaneous switching noise, while bus-hold circuitry eliminates external bias resistors on all I/O pins. Output enable is active-low, and power-up high-impedance is ensured when OE is pulled to V_CC.

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 ABT logic systems without level translation.
Operating Temperature	−40°C to 85°C - qualified for commercial and industrial ambient environments without derating.
Output Drive	−32 mA (I_OH), 64 mA (I_OL) - drives heavy capacitive loads and multiple TTL inputs directly.
Max Clock Frequency	150 MHz - supports high-throughput data exchange in real-time bus arbitration and FPGA-to-FPGA bridging.
Propagation Delay	1.1–6.9 ns (t_PLH/t_PHL) - enables sub-7-ns path timing for critical interconnect paths at 150-MHz operation.
Input Clamp Current	−18 mA - protects against transient overvoltage events on control and data lines per JEDEC JESD-17.
Bus-Hold Current	±100 µA - maintains valid logic state on floating or unterminated I/O pins without external resistors.

Pinout & Package

Packaged in an 80-pin plastic thin quad flat package (PN) with 12 × 12-mm body and 0.5-mm lead pitch; features distributed V_CC and GND pins (12 total power/ground terminals) to suppress high-speed switching noise.

Pin/Terminal	Circuit Role	Design Meaning
OEA, OEB, OEC	Active-low output enable	Tri-states corresponding 18-bit port outputs independently; tied to V_CC via pullup for power-up safety.
SELA, SELB, SELC	Port select control	Determines source port for each output port (e.g., SELA = L selects B→A, H selects C→A).
LEA, LEB, LEC	Latch-enable input	Configures A/B/C register mode: high = transparent, low + static CLK = latched, low + CLK↑ = edge-clocked.
CLKA, CLKB, CLKC	Clock input	Edge-triggered sampling when LE is low; no effect when LE is high (transparent mode).
A1–A18, B1–B18, C1–C18	18-bit bidirectional I/O ports	Three fully independent 18-bit data buses with bus-hold on all pins; no direction pin required.

Key Features

Feature	Design Value
UBE Architecture	Combines D-latches and D-flip-flops per port to support mixed-mode data routing (real-time + stored) without external glue logic.
EPIC-II^B BiCMOS Process	Reduces dynamic power vs. standard bipolar TTL while retaining high speed and drive capability.
Distributed Power/Ground Pins	12 V_CC/GND pairs minimize ground bounce (V_OLP < 0.8 V) and supply noise during 150-MHz switching.
Bus-Hold Inputs	Eliminates need for 10-kΩ pullup/pulldown resistors on all 54 I/O lines, reducing BOM count and board area.
Latch-Up Immunity	Exceeds 500 mA per JEDEC JESD-17 - ensures robustness in noisy industrial power environments.

Applications

Backplane Data Routing	FPGA Interconnect Bridge
Use Scenario: High-speed data exchange between multiple line cards in a modular telecom chassis with shared backplane bus. IC Role / Device Role / Timing Role: Universal bus exchanger managing time-multiplexed access to a common 18-bit data path among three independent processing modules. Use Value: Enables deterministic latency routing with 150-MHz clock support and sub-7-ns propagation delay, eliminating arbitration logic.	Use Scenario: Bidirectional data transfer between two Xilinx Virtex FPGAs and a third Altera Stratix FPGA sharing memory-mapped peripherals. IC Role / Device Role / Timing Role: Registered I/O hub providing synchronized, glitch-free handshaking across heterogeneous FPGA clock domains. Use Value: Eliminates need for custom HDL synchronization FIFOs by leveraging built-in latch/flip-flop registers and independent OE/SEL controls.
Industrial PLC I/O Expansion	Test Equipment Signal Switching
Use Scenario: Adding isolated digital I/O capacity to a programmable logic controller via modular expansion slot with hot-swap capability. IC Role / Device Role / Timing Role: Fault-tolerant bus interface with bus-hold protection and high ESD immunity for field-wire-connected signals. Use Value: Prevents undefined states during module insertion/removal; latch-up rating >500 mA withstands industrial transients.	Use Scenario: Reconfigurable signal path selection in automated test equipment connecting DUT pins to multiple measurement instruments. IC Role / Device Role / Timing Role: High-drive multiplexer with tri-state outputs enabling non-invasive signal injection and monitoring. Use Value: 64-mA sink drive supports driving long cables and multiple instrument inputs simultaneously without buffers.

Backplane Data Routing

FPGA Interconnect Bridge

Use Scenario: High-speed data exchange between multiple line cards in a modular telecom chassis with shared backplane bus.

IC Role / Device Role / Timing Role: Universal bus exchanger managing time-multiplexed access to a common 18-bit data path among three independent processing modules.

Use Value: Enables deterministic latency routing with 150-MHz clock support and sub-7-ns propagation delay, eliminating arbitration logic.

Use Scenario: Bidirectional data transfer between two Xilinx Virtex FPGAs and a third Altera Stratix FPGA sharing memory-mapped peripherals.

IC Role / Device Role / Timing Role: Registered I/O hub providing synchronized, glitch-free handshaking across heterogeneous FPGA clock domains.

Use Value: Eliminates need for custom HDL synchronization FIFOs by leveraging built-in latch/flip-flop registers and independent OE/SEL controls.

Industrial PLC I/O Expansion

Test Equipment Signal Switching

Use Scenario: Adding isolated digital I/O capacity to a programmable logic controller via modular expansion slot with hot-swap capability.

IC Role / Device Role / Timing Role: Fault-tolerant bus interface with bus-hold protection and high ESD immunity for field-wire-connected signals.

Use Value: Prevents undefined states during module insertion/removal; latch-up rating >500 mA withstands industrial transients.

Use Scenario: Reconfigurable signal path selection in automated test equipment connecting DUT pins to multiple measurement instruments.

IC Role / Device Role / Timing Role: High-drive multiplexer with tri-state outputs enabling non-invasive signal injection and monitoring.

Use Value: 64-mA sink drive supports driving long cables and multiple instrument inputs simultaneously without buffers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal bus exchanger applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT823N	Single 20-bit latch-only register (no clocked mode, no port-to-port exchange logic)	Limited to simple input latching; lacks SEL/CLK-based cross-port routing capability of SN74ABT32318PN	Select only when application requires basic 20-bit latching without dynamic port selection or clocked update.
SN74ALVCH162374DGGR	16-bit dual-edge-triggered D-type flip-flop with separate OE per 8-bit half; no latch mode or SEL-based routing	Supports higher density (32 bits) but no multi-port exchange function; operates at 3.3 V only	Choose for 3.3-V systems requiring high-density edge-triggered storage, not for 5-V bus-exchange topologies.

Compared with SN74ABT823N and SN74ALVCH162374DGGR, the SN74ABT32318PN uniquely integrates transparent/latched/clocked operation, three-way port exchange, and 5-V high-drive in a single 80-pin package-making it irreplaceable for real-time multi-subsystem data arbiters requiring deterministic routing and robust industrial drive.

Availability

SN74ABT32318PN is available at Aetrix Electronics and suitable for backplane routing, FPGA interconnect, industrial PLC expansion, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74ABT32318PN 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ABT32318PN belongs to TI's Widebus+ family of high-speed ABT logic devices, designed specifically for noise-immune, high-drive bus interfacing and modular system interconnect in demanding real-time applications.

FAQ

What is the primary function of the SN74ABT32318PN?

The SN74ABT32318PN is a triple-port 18-bit universal bus exchanger that enables configurable data routing between three independent 18-bit I/O ports (A, B, C) using latch, transparent, or clocked modes. Its UBE architecture allows real-time and stored data exchange without external logic, making it ideal for modular system interconnect and backplane arbitration where deterministic latency and high drive are required.

Does the SN74ABT32318PN support 3.3-V operation?

No, the SN74ABT32318PN is specified only for 4.5 V to 5.5 V supply operation per its recommended operating conditions. It is not 3.3-V compatible. Attempting to operate the SN74ABT32318PN below 4.5 V may result in unreliable latch behavior, increased propagation delay, or failure to meet timing specifications such as the 150-MHz maximum clock frequency.

How does the bus-hold feature work on the SN74ABT32318PN?

The SN74ABT32318PN integrates active bus-hold circuitry on all 54 I/O pins (A1–A18, B1–B18, C1–C18), maintaining the last-valid logic state when inputs float. This eliminates the need for external 10-kΩ pullup or pulldown resistors, reducing BOM cost and PCB space. Bus-hold current is ±100 µA at V_CC = 4.5 V and V_I = 2 V, ensuring stable operation during hot-swap or unconnected states.

What is the significance of the distributed VCC/GND pin layout in the SN74ABT32318PN?

The SN74ABT32318PN uses 12 dedicated V_CC and GND pins distributed across the 80-pin PN package to minimize simultaneous switching noise and ground bounce. This layout reduces typical V_OLP (output ground bounce) to <0.8 V at V_CC = 5 V and 25°C, enabling reliable 150-MHz operation in electrically noisy environments such as industrial backplanes or dense FPGA carrier boards.

Can the SN74ABT32318PN be used as a direct replacement for the SN74ABT32318DW?

No - the SN74ABT32318PN and SN74ABT32318DW share identical logic functionality and electrical specs but differ in package: PN is an 80-pin TQFP (0.5-mm pitch), while DW is a 24-pin SOIC. They are not pin-compatible or drop-in replacements. Migration requires full PCB redesign due to incompatible pin count, layout, and thermal profile - the PN variant supports full 18-bit triple-port operation, whereas DW is obsolete and not manufactured.

SN74ABT32318PN Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

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Mounting Type:: -

Supplier Device Package:: -

SN74ABT32318PN FAQ

1.How can I place an order for SN74ABT32318PN through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT32318PN 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 SN74ABT32318PN reliable?

The price and inventory of SN74ABT32318PN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT32318PN is usually 5 days.

3.What payment methods are accepted for SN74ABT32318PN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT32318PN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ABT32318PN?

SN74ABT32318PN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT32318PN 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 SN74ABT32318PN?

For technical support, including SN74ABT32318PN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT32318PN requirements.

6.How does Aetrix verify that SN74ABT32318PN is sourced from the original manufacturer or authorized distributors?

All SN74ABT32318PN 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 SN74ABT32318PN meets industry standards.

7.What is the process for return or replacement of SN74ABT32318PN?

All SN74ABT32318PN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT32318PN, 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 SN74ABT32318PN part is unused and in its original packaging.

Return procedure for SN74ABT32318PN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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