Texas Instruments SN74LVCZ245AN

Overview

SN74LVCZ245AN from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V buses. It operates from 2.7 V to 3.6 V, accepts 5.5-V-tolerant inputs, delivers 6.3 ns max propagation delay at 3.3 V, and supports hot insertion via Ioff and power-up 3-state logic - used in mixed-voltage system interconnects such as industrial backplanes and FPGA-to-ASIC bridging.

For engineers reviewing the SN74LVCZ245AN datasheet, SN74LVCZ245AN pinout, SN74LVCZ245AN application, or SN74LVCZ245AN equivalent, key selection criteria include voltage translation capability (3.3-V VCC with 5-V input tolerance), DIR/OE-controlled directionality, ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2 V) performance, and JESD 78 Class II latch-up immunity.

Technical Context

This device implements dual-bus bidirectional communication using a single DIR control input to select A→B or B→A data flow, while OE independently enables or disables all outputs into high-impedance state. Its Ioff circuitry actively blocks current backflow during power-down, and power-up 3-state ensures outputs remain tri-stated until VCC exceeds 1.5 V.

The SN74LVCZ245AN features mixed-mode signal operation: all I/O ports tolerate 5-V signals while powered from 3.3-V VCC, enabling level-shifting without external resistors. Absolute maximum ratings include –0.5 V to 6.5 V on inputs/outputs and ±50 mA continuous output current, with thermal impedance of 89°C/W in the PDIP-N package.

Key Specifications

Pinout & Package

SN74LVCZ245AN is housed in a 20-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, and the package complies with JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and 74ALVC16245, the SN74LVCZ245AN uniquely combines 5.5-V input tolerance, sub-0.8-V ground bounce, and hot-insertion readiness in an 8-bit PDIP package - making it optimal for space-constrained, mixed-voltage industrial interfaces requiring signal integrity and robustness.

Availability

SN74LVCZ245AN is available at Aetrix Electronics and suitable for industrial backplane interconnect, FPGA-to-microcontroller bridging, and legacy peripheral integration requiring stable component supply and long-term obsolescence management.

Supply support for SN74LVCZ245AN 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 company specializing in analog, embedded processing, and logic solutions with broad industrial and automotive reach.

The SN74LVCZ245AN belongs to TI's LVCZ logic family, engineered specifically for low-noise, mixed-voltage bus translation in harsh electromagnetic environments.

FAQ

What is the maximum input voltage the SN74LVCZ245AN can safely accept?

The SN74LVCZ245AN accepts input voltages up to 5.5 V across all pins, independent of VCC level. This 5-V tolerance enables direct connection to legacy 5-V logic families without external protection or level-shifting circuitry, and is explicitly validated under absolute maximum ratings and recommended operating conditions in the official datasheet.

Does the SN74LVCZ245AN support hot insertion, and how is it implemented?

Yes, the SN74LVCZ245AN supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0, preventing damaging back-current, and power-up 3-state holds all outputs in high-impedance until VCC exceeds 1.5 V. These mechanisms are fully specified per TI's hot-insertion guidelines and eliminate need for external sequencing or isolation components.

What is the propagation delay of the SN74LVCZ245AN at 3.3 V, and how does it impact timing budgets?

The SN74LVCZ245AN has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V and TA = 25°C. This value directly constrains maximum bus clock frequency and setup/hold margin in synchronous systems; for example, it allows ≤150 MHz operation in simple combinatorial paths, assuming minimal additional routing delay.

How does the SN74LVCZ245AN handle ground bounce and output undershoot?

The SN74LVCZ245AN specifies typical output ground bounce (VOLP) < 0.8 V and output undershoot (VOHV) > 2 V at VCC = 3.3 V and TA = 25°C. These parameters reflect optimized output driver staging and on-die noise suppression, reducing signal distortion during simultaneous switching - critical for reliable operation in high-density PCBs with shared ground planes.

Can the SN74LVCZ245AN operate with a 2.5-V supply voltage?

No, the SN74LVCZ245AN is not rated for 2.5-V operation. Its recommended operating range is strictly 2.7 V to 3.6 V per the datasheet's "Recommended Operating Conditions" table. Operation below 2.7 V may result in undefined logic states, increased propagation delay, or failure to meet 5.5-V input tolerance specifications.