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

onsemi 74LCXZ16245MTDX

Name: 74LCXZ16245MTDX
Brand: onsemi
SKU: 74LCXZ16245MTDX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXZ16245MTDX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCXZ16245MTDX.pdf

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

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Product details

Overview

74LCXZ16245 from onsemi (formerly Fairchild Semiconductor) is a low-voltage 16-bit bidirectional transceiver with 5V-tolerant I/O, designed for bus interfacing between 2.7–3.6V logic domains and 5V systems. It features byte-wise direction control (T/R), independent output enable (OE), 3-STATE outputs, and power-down high-impedance protection during V_CC ramp-up/down. Used in legacy industrial backplanes and mixed-voltage memory/data buses.

For engineers reviewing the 74LCXZ16245 datasheet, pinout, applications, or equivalent options, key selection criteria include 5V I/O tolerance, 4.5 ns max propagation delay at 3.3V, ±24 mA drive strength, JEDEC MO-153 TSSOP-48 package compatibility, and live-insertion support in hot-swap subsystems.

Technical Context

The 74LCXZ16245 implements two independent 8-bit bidirectional data paths (A0–A7/B0–B7 and A8–A15/B8–B15), each controlled by dedicated OE and T/R inputs. Its CMOS-based architecture enables rail-to-rail 5V-tolerant I/O operation while powered from 2.7–3.6V V_CC, eliminating level-shifting components in mixed-voltage interconnects.

It integrates patented noise/EMI reduction circuitry and meets JESD78 latch-up immunity standards. Power-down behavior ensures all I/Os enter high-impedance state when V_CC is below 1.5V, preventing bus contention during power sequencing - critical for hot-pluggable modules and legacy system upgrades.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V to 3.6V - Enables direct interface with 3.3V logic while tolerating 5V signals on I/O pins
t_PD Max	4.5 ns at V_CC = 3.3V - Supports high-speed data transfer across 16-bit buses up to ~220 MHz toggle rate
I/O Drive	±24 mA at V_CC = 3.0V - Sufficient to drive standard TTL loads and stubbed transmission lines without external buffers
Input Voltage Range	0V to 5.5V - Allows safe connection to 5V sources without clamping diodes or external resistors
Power-Down Leakage	<10 µA at V_CC = 0V - Ensures zero current draw and bus isolation during complete power removal
Operating Temperature	−40°C to +85°C - Qualified for industrial ambient environments including factory automation and telecom line cards

Pinout & Package

Package: 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide (Package Number MTD48).

Pin/Terminal	Circuit Role	Design Meaning
OE1, OE2	Output Enable Inputs (active-low)	Disable both A and B ports of respective byte to high-impedance; essential for bus arbitration and multi-drop sharing
T/R1, T/R2	Transmit/Receive Control Inputs	Determine data flow direction per byte: LOW = B→A, HIGH = A→B; enables flexible half-duplex bus management
A0–A15	Bidirectional I/O Port A	Connects to local 3.3V domain; 5V-tolerant - accepts 5V inputs and drives 5V loads when enabled
B0–B15	Bidirectional I/O Port B	Connects to external 5V subsystem (e.g., legacy ISA bus, EEPROM, or FPGA I/O); no level shifter required
V_CC, GND	Power and Ground Pins	Multiple V_CC/GND pairs reduce switching noise and improve signal integrity on high-speed 16-bit paths

Key Features

Feature	Design Value
5V-tolerant I/O	Operates safely with 0–5.5V input/output voltages while powered from 2.7–3.6V - eliminates discrete level translators
Byte-selectable control	Independent OE/T/R per 8-bit byte allows partial bus gating and asymmetric data flow - ideal for segmented memory or peripheral interfaces
Power-down high-Z	Automatically places all I/Os in high-impedance state when V_CC < 1.5V - prevents bus glitches during hot insertion or brown-out conditions
Noise/EMI reduction	Patented internal circuitry suppresses simultaneous switching noise - reduces ground bounce and crosstalk in dense PCB layouts

Applications

ISA Bus Interface	Legacy Memory Expansion
Use Scenario: Interfacing modern 3.3V microcontrollers to legacy ISA-bus peripherals (e.g., industrial I/O cards) operating at 5V. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus buffer; manages direction and enable timing synchronized to ISA control signals. Use Value: Eliminates need for dual-supply level shifters; supports full 16-bit ISA data path with sub-5 ns propagation delay and live-insertion safety.	Use Scenario: Adding external SRAM or Flash memory to embedded systems where host MCU runs at 3.3V but memory parts require 5V I/O. IC Role / Device Role / Timing Role: Data-path transceiver managing read/write bursts between MCU and memory; OE/T/R timed to match memory access cycles. Use Value: Enables direct connection without pull-up resistors or voltage translators; ±24 mA drive ensures reliable signal integrity over 4-inch traces.
FPGA I/O Bridging	Hot-Swappable Module Backplane
Use Scenario: Connecting a 3.3V FPGA I/O bank to 5V-compatible daughterboards or mezzanine cards in reconfigurable computing platforms. IC Role / Device Role / Timing Role: Configurable bidirectional bridge; T/R toggled dynamically via FPGA control to adapt to varying data flow directions. Use Value: Provides robust 5V-tolerant interface with ESD protection (HBM ≥2000V) and skew-controlled timing for synchronous transfers.	Use Scenario: Enabling hot-plug capability in modular industrial controllers where field-replaceable modules connect to a 5V backplane. IC Role / Device Role / Timing Role: Isolation and translation layer; power-down high-Z behavior prevents bus contention during module insertion/removal. Use Value: Meets live-insertion requirements per Note 1; pull-up resistor on OE ensures fail-safe high-Z state during power ramp.

ISA Bus Interface

Legacy Memory Expansion

Use Scenario: Interfacing modern 3.3V microcontrollers to legacy ISA-bus peripherals (e.g., industrial I/O cards) operating at 5V.

IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus buffer; manages direction and enable timing synchronized to ISA control signals.

Use Value: Eliminates need for dual-supply level shifters; supports full 16-bit ISA data path with sub-5 ns propagation delay and live-insertion safety.

Use Scenario: Adding external SRAM or Flash memory to embedded systems where host MCU runs at 3.3V but memory parts require 5V I/O.

IC Role / Device Role / Timing Role: Data-path transceiver managing read/write bursts between MCU and memory; OE/T/R timed to match memory access cycles.

Use Value: Enables direct connection without pull-up resistors or voltage translators; ±24 mA drive ensures reliable signal integrity over 4-inch traces.

FPGA I/O Bridging

Hot-Swappable Module Backplane

Use Scenario: Connecting a 3.3V FPGA I/O bank to 5V-compatible daughterboards or mezzanine cards in reconfigurable computing platforms.

IC Role / Device Role / Timing Role: Configurable bidirectional bridge; T/R toggled dynamically via FPGA control to adapt to varying data flow directions.

Use Value: Provides robust 5V-tolerant interface with ESD protection (HBM ≥2000V) and skew-controlled timing for synchronous transfers.

Use Scenario: Enabling hot-plug capability in modular industrial controllers where field-replaceable modules connect to a 5V backplane.

IC Role / Device Role / Timing Role: Isolation and translation layer; power-down high-Z behavior prevents bus contention during module insertion/removal.

Use Value: Meets live-insertion requirements per Note 1; pull-up resistor on OE ensures fail-safe high-Z state during power ramp.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC16245ADGG	Lower V_CC range (1.65–3.6V); 5V-tolerant only on inputs (not outputs); t_PD = 5.2 ns max at 3.3V	Not suitable for 5V-output driving; requires external pull-ups for 5V bus termination	Select when only input-level translation is needed and output drive to 5V is handled elsewhere
SN74AVC16T245DGGR	Wider V_CC range (1.2–3.6V); dual-supply operation (V_CCA/V_CCB); auto-direction sensing; t_PD = 3.8 ns max	Supports true dual-voltage domains (e.g., 1.8V ↔ 3.3V); lacks native 5V output drive capability	Prefer for newer low-voltage designs requiring automatic direction control and tighter timing margins

Compared with 74LCXZ16245, the 74LVC16245ADGG offers broader supply flexibility but sacrifices 5V output drive, while SN74AVC16T245DGGR delivers superior speed and dual-supply operation but cannot directly drive 5V loads - making 74LCXZ16245 uniquely suited for legacy 3.3V-to-5V bidirectional bus bridging.

Availability

74LCXZ16245 is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy memory expansion, FPGA I/O bridging, and hot-swappable module designs requiring stable component supply and long-term obsolescence mitigation.

Supply support for 74LCXZ16245 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 Fairchild Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 74LCXZ16245 belongs to the LCX family of low-voltage, 5V-tolerant logic devices engineered specifically for seamless interoperability between emerging 3.3V systems and legacy 5V infrastructure.

FAQ

Is the 74LCXZ16245 still in production?

No - the 74LCXZ16245 is discontinued and not recommended for new designs per onsemi's official documentation. However, Aetrix Electronics maintains active inventory and provides extended lifecycle support, including traceable sourcing and obsolescence management for legacy industrial and defense programs relying on the 74LCXZ16245.

What is the maximum data rate supported by the 74LCXZ16245?

The 74LCXZ16245 supports data rates up to approximately 220 MHz, derived from its 4.5 ns maximum propagation delay (t_PD) at V_CC = 3.3V. This enables reliable operation in high-speed parallel bus applications such as ISA, PC/104, and custom memory-mapped interfaces where setup/hold timing margins are maintained.

Can the 74LCXZ16245 drive a 5V bus directly?

Yes - the 74LCXZ16245 features true 5V-tolerant outputs: when enabled, it can source/sink up to ±24 mA while driving 5V logic levels, even when powered from 2.7–3.6V V_CC. This eliminates external level-shifting components in 3.3V-to-5V bidirectional bus connections, a core design advantage of the 74LCXZ16245.

How does the 74LCXZ16245 handle power sequencing during hot insertion?

The 74LCXZ16245 automatically enters a high-impedance state on all I/Os when V_CC drops below 1.5V, ensuring safe hot insertion into live 5V backplanes. To guarantee this behavior, OE must be tied to V_CC via a pull-up resistor - a requirement explicitly defined in the 74LCXZ16245 datasheet for robust live-insertion operation.

Does the 74LCXZ16245 support live insertion without external circuitry?

Yes - the 74LCXZ16245 supports live insertion per Note 1 in its datasheet, provided OE is pulled up to V_CC with an appropriately sized resistor. Its power-down high-impedance feature, combined with 5V-tolerant I/O and ESD protection (HBM ≥2000V), enables safe connection to energized 5V buses without additional protection circuitry - a key capability of the 74LCXZ16245.

74LCXZ16245MTDX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXZ

Package/Case:: 48-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:: 24mA, 24mA

Voltage - Supply:: 2.7V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

74LCXZ16245MTDX FAQ

1.How can I place an order for 74LCXZ16245MTDX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXZ16245MTDX 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 74LCXZ16245MTDX reliable?

The price and inventory of 74LCXZ16245MTDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ16245MTDX is usually 5 days.

3.What payment methods are accepted for 74LCXZ16245MTDX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXZ16245MTDX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXZ16245MTDX?

74LCXZ16245MTDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXZ16245MTDX 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 74LCXZ16245MTDX?

For technical support, including 74LCXZ16245MTDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ16245MTDX requirements.

6.How does Aetrix verify that 74LCXZ16245MTDX is sourced from the original manufacturer or authorized distributors?

All 74LCXZ16245MTDX 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 74LCXZ16245MTDX meets industry standards.

7.What is the process for return or replacement of 74LCXZ16245MTDX?

All 74LCXZ16245MTDX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ16245MTDX, 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 74LCXZ16245MTDX part is unused and in its original packaging.

Return procedure for 74LCXZ16245MTDX:

1.Submit a request within 90 days.

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

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