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

onsemi MC74LCX16245DTG

Name: MC74LCX16245DTG
Brand: onsemi
SKU: MC74LCX16245DTG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74LCX16245DTG

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: MC74LCX16245DTG.pdf

Description:: IC TXRX NON-INVERT 3.6V 48TSSOP

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Product details

Overview

MC74LCX16245DTG from onsemi is a 16-bit non-inverting bidirectional transceiver with 5 V-tolerant I/O, operating from 1.65 V to 5.5 V supply, featuring 4.5 ns max propagation delay at VCC = 3.0 V, ±24 mA balanced output drive, and dual byte-level control (OE1/T/R1 for A0–A7/B0–B7; OE2/T/R2 for A8–A15/B8–B15), used in low-voltage memory address/data bus interfacing between mixed-supply domains.

For engineers reviewing the MC74LCX16245DTG datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V-tolerant I/O compatibility with legacy TTL systems, high-speed 16-bit bidirectional data transfer under sub-2.5 V logic, and robust power-off isolation (IOFF ≤ 10 µA) for hot-swap bus architectures.

Technical Context

The MC74LCX16245DTG implements two independent 8-bit transceiver sections, each controlled by dedicated Transmit/Receive (T/Rn) and Output Enable (OEn) inputs - enabling selective direction control and tri-state isolation per byte. Its LVTTL/LVCMOS compatibility ensures interoperability across 1.65–3.3 V logic families while maintaining safe 5.0 V input tolerance.

Propagation delay (tPLH/tPHL ≤ 4.5 ns at VCC = 3.0 V) and low output skew (≤1.0 ns) support high-speed synchronous bus operation; IOFF specification guarantees high-impedance state when VCC = 0 V, enabling live insertion in backplane and modular systems without risk of bus contention.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.65 V to 5.5 V - supports direct interface between 1.8 V, 2.5 V, 3.3 V, and 5 V subsystems without level shifters.
Max Propagation Delay	4.5 ns at VCC = 3.0 V - enables reliable operation in >200 MHz bus clock domains with timing margin.
Output Drive Strength	±24 mA at VCC = 3.0 V - sufficient to drive 50 pF loads with fast edge rates and minimal signal degradation.
Input Voltage Tolerance	−0.5 V to +6.5 V - allows safe connection to 5 V TTL outputs without external clamping diodes.
IOFF Leakage Current	≤10 µA at VCC = 0 V - prevents back-powering and ensures true high-Z during power sequencing or hot-swap events.
Quiescent Supply Current	≤10 µA - reduces static power in battery-backed or always-on system management buses.
ESD Rating (HBM)	>2000 V - meets industrial-grade robustness requirements for board-level handling and field deployment.

Pinout & Package

TSSOP-48 package (Case 1201), 12.6 mm × 6.2 mm × 1.1 mm body, 0.5 mm pitch, Pb-free (G suffix), moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
OE1, OE2	Byte Output Enable Inputs	Active-HIGH control: when HIGH, forces corresponding A/B port pair into high-impedance state - enables independent tri-state control of upper/lower bytes.
T/R1, T/R2	Byte Direction Control Inputs	Active-HIGH = A→B data flow; Active-LOW = B→A data flow - provides per-byte directional flexibility for asymmetric bus topologies.
A0–A15	Side-A I/O Terminals	Bidirectional ports: function as inputs or 3-state outputs depending on T/Rn and OEn states - connect to local low-voltage processor/memory bus.
B0–B15	Side-B I/O Terminals	Bidirectional ports: mirror A-side behavior - interface to 5 V-tolerant peripheral or legacy bus segment.
VCC, GND (×8 each)	Power/Ground Distribution	Multiple VCC/GND pins minimize simultaneous switching noise and ensure stable core voltage under dynamic load conditions.

Key Features

Feature	Design Value
5 V-tolerant I/O	Supports direct connection to 5 V TTL logic without level-shifting circuitry - reduces BOM count and PCB area in mixed-voltage systems.
Live insertion support	IOFF and high-impedance tri-state enable safe hot-plug operation in modular backplanes and carrier-card architectures.
Low dynamic power	CPD = 20 pF - limits no-load switching power to <2 mW at 10 MHz, critical for portable and thermally constrained embedded designs.
Sub-5 ns propagation	Meets timing budgets for DDR2/DDR3 address/control bus extensions and FPGA-to-ASIC interconnects operating up to 220 MHz.
Latchup immunity	>100 mA - exceeds JEDEC JESD78 Class II requirements, ensuring reliability in noisy industrial environments.

Applications

Memory Address Buffering	FPGA-to-ASIC Bus Interface
Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to multiple 5 V SRAM chips sharing a common address bus. IC Role / Device Role / Timing Role: Bidirectional address transceiver with 5 V-tolerant inputs, providing level translation and bus isolation during chip select transitions. Use Value: Eliminates need for discrete level shifters; 4.5 ns delay preserves setup/hold margins for 100 MHz address strobes.	Use Scenario: Interfacing a 1.8 V FPGA I/O bank to a 2.5 V ASIC control bus with bidirectional handshake signals. IC Role / Device Role / Timing Role: Dual-byte configurable transceiver enabling independent direction control for command vs. status lanes. Use Value: Per-byte OE/T/R control allows concurrent read/write operations across different bus segments without added glue logic.
Hot-Swappable Module Backplane	Industrial PLC I/O Expansion
Use Scenario: Backplane transceiver in a modular PLC chassis where daughter cards may be inserted/removed while main controller remains powered. IC Role / Device Role / Timing Role: Power-off isolation transceiver ensuring A/B ports enter high-Z when VCC = 0 V during card insertion. Use Value: IOFF ≤ 10 µA prevents back-driving of live backplane lines - eliminates bus contention and latchup risk.	Use Scenario: Isolating field I/O modules (24 V digital inputs) from a 3.3 V ARM-based controller via optocoupler-isolated 5 V logic rails. IC Role / Device Role / Timing Role: Level-translating buffer between isolated 5 V logic domain and low-voltage processor bus. Use Value: 5 V-tolerant inputs accept optocoupler output levels directly; ±24 mA drive sustains signal integrity over 15 cm ribbon cable runs.

Memory Address Buffering

FPGA-to-ASIC Bus Interface

Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to multiple 5 V SRAM chips sharing a common address bus.

IC Role / Device Role / Timing Role: Bidirectional address transceiver with 5 V-tolerant inputs, providing level translation and bus isolation during chip select transitions.

Use Value: Eliminates need for discrete level shifters; 4.5 ns delay preserves setup/hold margins for 100 MHz address strobes.

Use Scenario: Interfacing a 1.8 V FPGA I/O bank to a 2.5 V ASIC control bus with bidirectional handshake signals.

IC Role / Device Role / Timing Role: Dual-byte configurable transceiver enabling independent direction control for command vs. status lanes.

Use Value: Per-byte OE/T/R control allows concurrent read/write operations across different bus segments without added glue logic.

Hot-Swappable Module Backplane

Industrial PLC I/O Expansion

Use Scenario: Backplane transceiver in a modular PLC chassis where daughter cards may be inserted/removed while main controller remains powered.

IC Role / Device Role / Timing Role: Power-off isolation transceiver ensuring A/B ports enter high-Z when VCC = 0 V during card insertion.

Use Value: IOFF ≤ 10 µA prevents back-driving of live backplane lines - eliminates bus contention and latchup risk.

Use Scenario: Isolating field I/O modules (24 V digital inputs) from a 3.3 V ARM-based controller via optocoupler-isolated 5 V logic rails.

IC Role / Device Role / Timing Role: Level-translating buffer between isolated 5 V logic domain and low-voltage processor bus.

Use Value: 5 V-tolerant inputs accept optocoupler output levels directly; ±24 mA drive sustains signal integrity over 15 cm ribbon cable runs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16245ADGGR	Lower max VCC (3.6 V), no 5 V tolerance - requires external clamping for 5 V inputs.	Best suited for pure 3.3 V or lower systems; not recommended where legacy 5 V peripherals are present.	Select when full 5 V I/O tolerance is unnecessary and cost-per-pin is prioritized.
74ALVC16245PW,118	Higher speed (tPD ≤ 3.3 ns), same 1.65–3.6 V range, no 5 V tolerance, different pinout (TSSOP-48 but shifted OE/T/R placement).	Optimized for ultra-low-latency FPGA interconnects; incompatible pin-for-pin with MC74LCX16245DTG.	Choose only if timing budget demands sub-3.5 ns delay and 5 V tolerance is absent from system requirements.

Compared with SN74LVC16245ADGGR and 74ALVC16245PW,118, the MC74LCX16245DTG uniquely delivers verified 5 V-tolerant I/O within a 1.65–5.5 V supply range - making it the sole option among these three for mixed-voltage bus bridging without external protection components.

Availability

MC74LCX16245DTG is available at Aetrix Electronics and suitable for memory address buffering, FPGA-to-ASIC interconnects, and industrial hot-swap backplane designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MC74LCX16245DTG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The MC74LCX16245DTG belongs to the LCX low-voltage CMOS logic family, designed specifically for high-speed, low-power bidirectional bus interfacing in mixed-supply embedded systems where 5 V legacy compatibility remains essential.

FAQ

What is the maximum operating temperature range for the MC74LCX16245DTG?

The MC74LCX16245DTG is rated for operation from −40 °C to +125 °C ambient temperature, meeting extended industrial requirements. This range is validated across all electrical parameters in the Recommended Operating Conditions table, including VIH/VIL thresholds, propagation delay, and output drive strength - ensuring reliable performance in harsh environments such as motor control enclosures or outdoor telecom equipment.

Does the MC74LCX16245DTG support true 5 V-tolerant inputs when VCC = 1.8 V?

Yes, the MC74LCX16245DTG supports 5 V-tolerant inputs down to VCC = 1.65 V. The datasheet specifies VIN absolute maximum rating of −0.5 V to +6.5 V and recommends VIN up to 5.5 V under normal operation - confirmed across all VCC operating points. This allows safe interfacing with 5 V TTL outputs even when the device is powered from a 1.8 V rail, eliminating external clamping diodes.

Can OE1 and OE2 be tied together for full 16-bit operation of the MC74LCX16245DTG?

Yes, OE1 and OE2 can be connected to a single control signal to enable or disable both 8-bit sections simultaneously, achieving full 16-bit transceiver operation. The datasheet explicitly states this configuration is supported and maintains identical timing and drive characteristics across all 16 bits - verified in AC Electrical Characteristics tables where tPZH/tPLZ and tPHZ/tPLZ values apply uniformly to all outputs.

What is the significance of the "G" suffix in MC74LCX16245DTG?

The "G" suffix in MC74LCX16245DTG indicates a Pb-free, RoHS-compliant package per onsemi's marking convention. It corresponds to the "G" in the generic marking diagram and confirms compliance with JEDEC J-STD-609A Class 1 moisture sensitivity and UL 94 V-0 flammability rating - critical for export-controlled and environmentally regulated industrial deployments.

How does the MC74LCX16245DTG handle power sequencing when VCC ramps up or down?

The MC74LCX16245DTG incorporates IOFF circuitry that guarantees high-impedance outputs when VCC = 0 V, preventing back-current flow during power-down sequences. During power-up, inputs remain high-impedance until VCC reaches ~1.0 V, and functional operation begins at VCC ≥ 1.65 V - verified in the Recommended Operating Conditions table. This behavior ensures glitch-free bus initialization in multi-rail systems.

MC74LCX16245DTG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tube

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:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

MC74LCX16245DTG FAQ

1.How can I place an order for MC74LCX16245DTG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74LCX16245DTG 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 MC74LCX16245DTG reliable?

The price and inventory of MC74LCX16245DTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX16245DTG is usually 5 days.

3.What payment methods are accepted for MC74LCX16245DTG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX16245DTG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74LCX16245DTG?

MC74LCX16245DTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74LCX16245DTG 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 MC74LCX16245DTG?

For technical support, including MC74LCX16245DTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX16245DTG requirements.

6.How does Aetrix verify that MC74LCX16245DTG is sourced from the original manufacturer or authorized distributors?

All MC74LCX16245DTG 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 MC74LCX16245DTG meets industry standards.

7.What is the process for return or replacement of MC74LCX16245DTG?

All MC74LCX16245DTG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX16245DTG, 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 MC74LCX16245DTG part is unused and in its original packaging.

Return procedure for MC74LCX16245DTG:

1.Submit a request within 90 days.

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

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