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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74ABT16646CMTDX

Name: 74ABT16646CMTDX
Brand: onsemi
SKU: 74ABT16646CMTDX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ABT16646CMTDX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 56-TFSOP (0.240", 6.10mm Width)

Datasheet:: 74ABT16646CMTDX.pdf

Description:: IC TXRX NON-INVERT 5.5V 56TSSOP

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Product details

Overview

74ABT16646CMTDX from Fairchild Semiconductor is a 16-bit bus transceiver and register IC with independent A/B registers, 3-STATE outputs, and dual-directional data flow control via DIR and OE pins; operates at 4.5–5.5 V, supports up to 200 MHz clock frequency, and delivers 64 mA sink / 32 mA source drive per I/O; used in high-speed backplane and memory interface buffering.

For engineers reviewing the 74ABT16646CMTDX datasheet, pinout, applications, or equivalent options, key selection criteria include real-time vs. registered data multiplexing capability, 56-pin TSSOP package compatibility, ±100 mA short-circuit tolerance, and guaranteed latchup protection across −40°C to +85°C ambient.

Technical Context

The 74ABT16646CMTDX implements dual 16-bit D-type flip-flop registers with separate CPABn/CPBAn clocks and SABn/SBAn select controls, enabling simultaneous storage and multiplexed output of real-time (transparent) or registered data on either bus. Its DIR input determines data direction during active transceiver mode, while OEn enables/disables all outputs with glitch-free high-impedance state during power-up/down.

It supports nondestructive hot insertion and features independent A/B bus I/O with identical electrical specs: VOL ≤ 0.55 V at IOL = 64 mA, VOH ≥ 2.0 V at IOH = −32 mA, and input thresholds VIH = 2.0 V / VIL = 0.8 V - all specified over full industrial temperature range and 4.5–5.5 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	+4.5 V to +5.5 V - ensures compatibility with 5 V TTL/CMOS systems and margin against rail droop in dense PCB layouts.
Max Clock Frequency	200 MHz - enables use in high-throughput address/data bus applications such as PCI-X edge interfaces and legacy memory controllers.
Output Drive	64 mA sink / 32 mA source - supports direct driving of multiple 5 V TTL loads without external buffers in point-to-point or stub-bus topologies.
Propagation Delay	1.5–4.9 ns (CL = 50 pF) - guarantees sub-5 ns timing closure for synchronous bus handshaking in real-time control subsystems.
Operating Temperature	−40°C to +85°C - qualified for industrial automation, telecom line cards, and base station control plane modules.
I/O Capacitance	11 pF (CI/O) - minimizes signal integrity degradation and crosstalk in high-density routing with tight trace spacing.
Short-Circuit Current	−100 to −275 mA - provides robust fault tolerance during board-level ESD events or accidental bus contention.

Pinout & Package

74ABT16646CMTDX is packaged in a 56-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). Pin count and physical layout match MTD56 package standard.

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	A-side bidirectional I/O	Register A inputs and 3-STATE outputs - connect to upstream processor or controller bus; driven by CPABn clock when storing data into A register.
B0–B15	B-side bidirectional I/O	Register B inputs and 3-STATE outputs - connect to downstream peripheral or memory bus; driven by CPBAn clock when storing data into B register.
CPABn, CPBAn	Asynchronous clock inputs	Edge-triggered clocks - LOW-to-HIGH transition latches data from respective bus into corresponding register, independent of OE or DIR state.
SABn, SBAn	Multiplexer select inputs	Control data source - SABn = L routes A-register data to B bus; SBAn = L routes B-register data to A bus; both H enables transparent (real-time) pass-through.
OEn	Global 3-STATE enable	Active LOW - disables all A/B outputs simultaneously into high-impedance state; remains glitch-free during power sequencing.
DIR	Data direction control	Active HIGH enables A→B transfer; LOW enables B→A transfer - defines destination bus when OE is active and transceiver mode is selected.

Key Features

Feature	Design Value
Independent A/B registers	Enables concurrent capture of data from two asynchronous buses - critical for protocol bridging between CPU and FPGA or DSP subsystems.
Multiplexed real-time & stored data	Allows dynamic switching between live bus traffic and pre-stored configuration words without interrupting system operation - used in reconfigurable I/O expansion.
64 mA sink / 32 mA source per I/O	Eliminates need for external bus drivers in mid-density 5 V systems - reduces BOM count and improves signal integrity on shared backplanes.
Guaranteed latchup protection	Withstands >500 mA reverse current injection - ensures reliability in noisy industrial environments with ground bounce or cable discharge events.
Nondestructive hot insertion	Permits safe field replacement of daughter cards without powering down host chassis - required for modular telecom and test equipment designs.

Applications

Industrial Backplane Interface	Legacy Memory Controller Buffer
Use Scenario: Interfacing a 32-bit microcontroller to a multi-slot VMEbus backplane with mixed 5 V TTL peripherals. IC Role / Device Role / Timing Role: Bidirectional bus transceiver and register - isolates CPU address/data lines from backplane noise while synchronizing burst transfers using CPABn/CPBAn clocks. Use Value: Enables deterministic timing via registered mode (tPLH ≤ 4.9 ns) and prevents bus contention during slot insertion/removal using OEn-controlled 3-STATE isolation.	Use Scenario: Buffering address and data lines between an ASIC memory controller and SRAM/Flash devices operating at different timing margins. IC Role / Device Role / Timing Role: Registered transceiver - stores controller outputs in A register and forwards them to memory bus on next clock edge, decoupling setup/hold timing violations. Use Value: Resolves timing skew between fast controller and slower memory by providing programmable pipeline delay (1-cycle register stage) with sub-5 ns propagation.
Reconfigurable I/O Expansion Module	Protocol Translation Bridge
Use Scenario: Adding isolated GPIO banks to an embedded Linux host via PCIe-to-PCI bridge with legacy ISA-style I/O mapping. IC Role / Device Role / Timing Role: Dual-register transceiver - uses SABn/SBAn to switch between firmware-configured I/O patterns stored in A/B registers and real-time sensor data streams. Use Value: Supports runtime reconfiguration of I/O function (input/output/pull-up) without hardware changes - achieved via multiplexed register selection and DIR-controlled direction.	Use Scenario: Converting between two incompatible 16-bit parallel protocols - e.g., proprietary FPGA interface to standard ISA bus timing. IC Role / Device Role / Timing Role: Timing-transparent protocol adapter - leverages real-time (transparent) and registered modes to align handshake signals and data valid windows across domains. Use Value: Eliminates need for custom CPLD glue logic by providing deterministic 1-cycle delay alignment and bus isolation - reducing design cycle time and validation effort.

Industrial Backplane Interface

Legacy Memory Controller Buffer

Use Scenario: Interfacing a 32-bit microcontroller to a multi-slot VMEbus backplane with mixed 5 V TTL peripherals.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver and register - isolates CPU address/data lines from backplane noise while synchronizing burst transfers using CPABn/CPBAn clocks.

Use Value: Enables deterministic timing via registered mode (tPLH ≤ 4.9 ns) and prevents bus contention during slot insertion/removal using OEn-controlled 3-STATE isolation.

Use Scenario: Buffering address and data lines between an ASIC memory controller and SRAM/Flash devices operating at different timing margins.

IC Role / Device Role / Timing Role: Registered transceiver - stores controller outputs in A register and forwards them to memory bus on next clock edge, decoupling setup/hold timing violations.

Use Value: Resolves timing skew between fast controller and slower memory by providing programmable pipeline delay (1-cycle register stage) with sub-5 ns propagation.

Reconfigurable I/O Expansion Module

Protocol Translation Bridge

Use Scenario: Adding isolated GPIO banks to an embedded Linux host via PCIe-to-PCI bridge with legacy ISA-style I/O mapping.

IC Role / Device Role / Timing Role: Dual-register transceiver - uses SABn/SBAn to switch between firmware-configured I/O patterns stored in A/B registers and real-time sensor data streams.

Use Value: Supports runtime reconfiguration of I/O function (input/output/pull-up) without hardware changes - achieved via multiplexed register selection and DIR-controlled direction.

Use Scenario: Converting between two incompatible 16-bit parallel protocols - e.g., proprietary FPGA interface to standard ISA bus timing.

IC Role / Device Role / Timing Role: Timing-transparent protocol adapter - leverages real-time (transparent) and registered modes to align handshake signals and data valid windows across domains.

Use Value: Eliminates need for custom CPLD glue logic by providing deterministic 1-cycle delay alignment and bus isolation - reducing design cycle time and validation effort.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit registered transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT16646DGGR	Same logic function, 56-pin TSSOP package, TI-manufactured; identical AC/DC specs but slightly higher ICCZ (1.2 mA vs. 1.0 mA).	Drop-in compatible in TI-based designs; requires verification of thermal pad soldering profile due to minor footprint variation.	Select when sourcing from TI distribution channels or when requiring TI's long-term product change notification process.
74LVT16646MTD	Lower voltage operation (3.3 V only); 64 mA drive reduced to 24 mA sink / 12 mA source; max fMAX = 150 MHz.	Not suitable for 5 V systems; requires level-shifting if interfacing with legacy 5 V peripherals.	Select only for new 3.3 V-only designs where lower power and reduced drive capability are acceptable trade-offs.

Compared with SN74ABT16646DGGR and 74LVT16646MTD, the 74ABT16646CMTDX offers superior 5 V drive strength and industrial temperature support - making it the preferred choice for legacy infrastructure upgrades and mixed-voltage backplane integration where robustness and compatibility are prioritized over ultra-low power.

Availability

74ABT16646CMTDX is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory controller buffering, reconfigurable I/O expansion modules, and protocol translation bridges requiring stable component supply across extended lifecycle programs.

Supply support for 74ABT16646CMTDX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; known for high-reliability logic, power management, and interface solutions.

The ABT logic family - including the 74ABT16646CMTDX - was designed for high-speed, low-noise 5 V bus interfacing in industrial and telecom infrastructure, emphasizing latchup immunity, hot-swap safety, and precise timing control.

FAQ

What is the maximum clock frequency supported by the 74ABT16646CMTDX?

The 74ABT16646CMTDX supports a maximum clock frequency of 200 MHz under standard operating conditions (VCC = 5.0 V, CL = 50 pF, TA = +25°C). At full industrial temperature range (−40°C to +85°C) and supply (4.5–5.5 V), the guaranteed minimum fMAX remains 200 MHz per AC Electrical Characteristics table in the official Fairchild datasheet DS011644. This makes the 74ABT16646CMTDX suitable for high-throughput synchronous bus applications such as legacy PCI and VME interfaces.

Does the 74ABT16646CMTDX support hot insertion?

Yes, the 74ABT16646CMTDX supports nondestructive hot insertion as explicitly stated in its Features section. Its input and output structures are designed to tolerate live backplane insertion without latchup or permanent damage, enabled by guaranteed latchup protection (>500 mA) and high-impedance glitch-free behavior during power transitions. This capability is essential for modular telecom and test equipment where field-replaceable units must be swapped without system shutdown - a key design requirement met by the 74ABT16646CMTDX.

What is the output drive capability of the 74ABT16646CMTDX?

The 74ABT16646CMTDX provides 64 mA sink current and 32 mA source current per I/O pin (A0–A15 and B0–B15), as specified in the DC Electrical Characteristics table. This drive strength allows direct interfacing with multiple standard 5 V TTL loads without external buffers. The value is guaranteed across the full industrial temperature range and supply voltage (4.5–5.5 V), making the 74ABT16646CMTDX especially valuable in high-noise environments like factory automation and base station control planes where signal integrity and fanout margin are critical.

How does the 74ABT16646CMTDX handle bus isolation during power-up?

The 74ABT16646CMTDX ensures high-impedance glitch-free bus loading during the entire power-up and power-down cycle, as confirmed in its Features list. Its 3-STATE outputs remain in a defined high-impedance state until VCC stabilizes and internal biasing completes - preventing unintended bus contention or data corruption. This behavior is intrinsic to the ABT family architecture and is verified across all operating conditions, making the 74ABT16646CMTDX reliable for use in systems with uncontrolled power sequencing, such as multi-rail industrial controllers.

What package type is used for the 74ABT16646CMTDX?

The 74ABT16646CMTDX uses a 56-lead Thin Shrink Small Outline Package (TSSOP), designated as package number MTD56 per Fairchild documentation. It complies with JEDEC MO-153, measures 6.1 mm wide, and features a 0.5 mm lead pitch. This package is surface-mount compatible, thermally optimized for industrial PCBs, and pin-compatible with other 56-pin TSSOP logic devices - ensuring straightforward integration into existing layouts that accommodate the MTD56 footprint.

74ABT16646CMTDX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ABT

Package/Case:: 56-TFSOP (0.240", 6.10mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

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:: 56-TSSOP

74ABT16646CMTDX FAQ

1.How can I place an order for 74ABT16646CMTDX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ABT16646CMTDX 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 74ABT16646CMTDX reliable?

The price and inventory of 74ABT16646CMTDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT16646CMTDX is usually 5 days.

3.What payment methods are accepted for 74ABT16646CMTDX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT16646CMTDX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ABT16646CMTDX?

74ABT16646CMTDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ABT16646CMTDX 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 74ABT16646CMTDX?

For technical support, including 74ABT16646CMTDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT16646CMTDX requirements.

6.How does Aetrix verify that 74ABT16646CMTDX is sourced from the original manufacturer or authorized distributors?

All 74ABT16646CMTDX 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 74ABT16646CMTDX meets industry standards.

7.What is the process for return or replacement of 74ABT16646CMTDX?

All 74ABT16646CMTDX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT16646CMTDX, 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 74ABT16646CMTDX part is unused and in its original packaging.

Return procedure for 74ABT16646CMTDX:

1.Submit a request within 90 days.

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

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