Texas Instruments SN74LVTZ245PWLE

Overview

SN74LVTZ245PWLE from Texas Instruments is an octal bus transceiver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output tolerance, 8-bit bidirectional data flow, ±64-mA output drive, and bus-hold inputs - used in voltage-level translation between 3.3-V logic buses and legacy 5-V systems.

For engineers reviewing the SN74LVTZ245PWLE datasheet, SN74LVTZ245PWLE pinout, SN74LVTZ245PWLE application, or SN74LVTZ245PWLE equivalent, key selection criteria include 3.3-V supply compatibility with 5-V I/O tolerance, direction-controlled bidirectional data transfer, high-impedance isolation during power sequencing, and TSSOP-20 packaging for space-constrained board layouts.

Technical Context

This device implements asynchronous bidirectional bus communication using a single DIR control input to select A→B or B→A data flow, and an active-low OE input to place outputs in high-impedance state. Its ABT BiCMOS process enables low static power (0.13 mA typical ICC in disabled state) while supporting fast switching (t_PLH/t_PHL ≤ 4 ns at V_CC = 3.3 V).

It features integrated bus-hold circuitry on all A/B port inputs (±75 µA hold current), eliminating external pull resistors, and supports unregulated battery operation down to 2.7 V. Input clamp ratings (−0.5 V to 7 V) and output overvoltage tolerance ensure robustness in mixed-voltage interconnects.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 0.65 mm lead pitch, 1.2 mm max height - optimized for high-density PCB layouts with automated assembly compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH245PW and SN74ALVC164245DL, the SN74LVTZ245PWLE uniquely combines 5-V I/O tolerance, integrated bus-hold, and 3.3-V operation - making it the only viable option for retrofitting 3.3-V controllers into existing 5-V infrastructure without redesigning signal conditioning.

Availability

SN74LVTZ245PWLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded controller bus extensions, portable data acquisition modules, telecom line card voltage translation, and hot-swap-capable system designs requiring stable component supply across extended lifecycle planning.

Supply support for SN74LVTZ245PWLE 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 specializing in analog, embedded processing, and logic technologies, with decades of innovation in high-reliability interface solutions.

The SN74LVTZ245PWLE belongs to TI's ABT Advanced BiCMOS logic family, engineered for robust mixed-voltage system integration in industrial, telecom, and computing infrastructure where 3.3-V core logic must interoperate with legacy 5-V subsystems.

FAQ

What is the maximum input voltage the SN74LVTZ245PWLE can tolerate on its A/B ports?

The SN74LVTZ245PWLE supports an absolute maximum input voltage of 7 V on all A and B port pins, with recommended operating input voltage up to 5.5 V. This 5-V tolerance enables direct connection to TTL outputs without external clamping or level-shifting circuitry, and the device maintains functionality across its full −40°C to +85°C temperature range under these conditions.

Does the SN74LVTZ245PWLE require external pull-up or pull-down resistors on its data lines?

No, the SN74LVTZ245PWLE includes active bus-hold circuitry on all A and B port inputs, providing ±75 µA hold current to maintain valid logic states on floating or unused lines. This eliminates the need for external pull resistors, reducing component count, PCB area, and potential signal integrity issues caused by resistor parasitics.

Can the SN74LVTZ245PWLE operate reliably at 2.7 V V_CC while driving 5-V logic inputs?

Yes, the SN74LVTZ245PWLE is fully characterized from 2.7 V to 3.6 V V_CC, and its outputs deliver VOH ≥ 2.4 V (min) and VOL ≤ 0.5 V (max) at 2.7 V - sufficient to meet TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Its 5-V-tolerant inputs accept signals directly from 5-V sources regardless of V_CC level.

What is the propagation delay performance of the SN74LVTZ245PWLE at 3.3 V?

At V_CC = 3.3 V and TA = 25°C, the SN74LVTZ245PWLE achieves t_PLH and t_PHL ≤ 4 ns (typical 2.5 ns) for A↔B data transfer, and enable/disable times (t_PZH, t_PZL, t_PHZ, t_PLZ) ≤ 6.5 ns. These values are measured with CL = 50 pF and ensure reliable operation in sub-100-MHz synchronous bus applications.

Is the SN74LVTZ245PWLE pin-compatible with other TSSOP-20 octal transceivers like the SN74LVC245A?

No, the SN74LVTZ245PWLE is not pin-compatible with SN74LVC245A. While both use TSSOP-20 packages, their pinouts differ: SN74LVTZ245PWLE places DIR on pin 1 and OE on pin 20, whereas SN74LVC245A assigns DIR to pin 19 and OE to pin 1. Substituting either part without PCB revision will result in functional failure due to misrouted control signals.