Texas Instruments SN74LVCZ244APW

Overview

SN74LVCZ244APW from Texas Instruments is an octal 3-state buffer/driver IC configured as two independent 4-bit banks, each controlled by a dedicated active-low output enable pin. It operates from 2.7V to 3.6V, supports 5.5V-tolerant inputs, delivers ≤5.9ns propagation delay at 3.3V, and enables mixed-mode interfacing (e.g., 5V signals with 3.3V V_CC) in server memory bus expansion.

For engineers reviewing the SN74LVCZ244APW datasheet, SN74LVCZ244APW pinout, SN74LVCZ244APW application, or SN74LVCZ244APW equivalent, key selection criteria include 3-state timing performance, I_off-enabled live insertion capability, overvoltage-tolerant input compatibility, and thermal resistance (R_θJA = 120.3°C/W) in the TSSOP-20 package.

Technical Context

The SN74LVCZ244APW implements dual-bank CMOS logic with independent OE control per bank, enabling selective bus isolation without global disable. Its balanced 3-state outputs support bidirectional signal routing while maintaining high-impedance integrity during power transitions.

It integrates partial-power-down (I_off) circuitry that disables all outputs when V_CC = 0V, preventing back-drive current and supporting hot-plug operation. Input clamping diodes and JESD78 Class II latch-up immunity (>100mA) ensure robustness in noisy industrial and server environments.

Key Specifications

Pinout & Package

PW package is a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, 6.5mm × 6.4mm footprint, and 6.5mm × 4.4mm body size. Thermal pad is not present in PW variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LVC244APW and 74ALVC244PW, the SN74LVCZ244APW uniquely combines 5.5V input tolerance, I_off-enabled live insertion, and JESD78 Class II latch-up immunity-making it the sole option qualified for mission-critical server and industrial backplane interfaces requiring mixed-voltage interoperability and field-replaceable module support.

Availability

SN74LVCZ244APW is available at Aetrix Electronics and suitable for server memory expansion, network switch backplanes, industrial PLC I/O modules, and PCB test fixture interfaces requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for SN74LVCZ244APW 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.

The SN74LVCZ244APW belongs to TI's LVCZ advanced logic family, engineered specifically for high-speed, mixed-voltage bus interface applications in servers, networking infrastructure, and industrial automation where reliability under thermal stress and electrical transients is critical.

FAQ

What is the maximum input voltage rating for SN74LVCZ244APW?

The SN74LVCZ244APW supports input voltages up to 5.5V across its entire operating temperature range, independent of V_CC. This overvoltage tolerance allows direct connection to 5V logic families without level-shifting circuitry, making SN74LVCZ244APW ideal for mixed-signal board designs where multiple supply domains coexist.

Does SN74LVCZ244APW support hot-plug operation?

Yes, SN74LVCZ244APW supports hot-plug operation via its I_off feature, which disables all outputs when V_CC = 0V. This prevents back-drive current from externally powered buses into the unpowered device, protecting both SN74LVCZ244APW and upstream components during live insertion or removal of expansion modules in server and telecom systems.

What is the typical propagation delay of SN74LVCZ244APW at 3.3V?

The typical propagation delay (t_pd) of SN74LVCZ244APW is 5.9ns at V_CC = 3.3V and T_A = 25°C, with a maximum of 6.4ns over the full –40°C to +125°C operating range. This timing performance enables SN74LVCZ244APW to meet setup/hold requirements in DDR4 memory subsystems running at 1600MT/s with margin.

How should unused inputs be handled on SN74LVCZ244APW?

All unused inputs on SN74LVCZ244APW must be tied to either V_CC or GND to prevent floating states that cause excessive power consumption or oscillation. TI recommends 10kΩ pull-up or pull-down resistors for undriven inputs. Leaving inputs unconnected violates recommended operating conditions and may compromise SN74LVCZ244APW reliability in production systems.

Is SN74LVCZ244APW compatible with standard TSSOP-20 PCB footprints?

Yes, SN74LVCZ244APW in the PW package uses the industry-standard 20-pin TSSOP footprint with 0.65mm lead pitch and 6.5mm × 6.4mm body dimensions. It is mechanically and electrically compatible with common TSSOP-20 land patterns defined in IPC-7351B, enabling drop-in replacement in existing designs using similar logic buffers.