Texas Instruments SN74LVCZ244AN

Overview

SN74LVCZ244AN from Texas Instruments is an octal buffer/line driver with 3-state outputs, organized as two independent 4-bit drivers (1A–1Y and 2A–2Y), operating from 2.7 V to 3.6 V V_CC, supporting 5.5-V-tolerant inputs, and delivering 5.9 ns max propagation delay at 3.3 V - used for bus buffering and level translation in memory systems and network switches.

For engineers reviewing the SN74LVCZ244AN datasheet, SN74LVCZ244AN pinout, SN74LVCZ244AN application, or SN74LVCZ244AN equivalent, key selection considerations include its dual independent output-enable control (1OE/2OE), I_off support for live insertion, mixed-mode 3.3-V/5-V signal interfacing, and guaranteed high-impedance during power-up/down.

Technical Context

The SN74LVCZ244AN implements CMOS-based non-inverting buffer logic with two separate 4-bit channels, each controlled by its own active-low output-enable input (1OE and 2OE). Its architecture supports hot-swap capability via I_off circuitry that disables outputs when V_CC = 0 V and power-up 3-state logic that maintains high-impedance until V_CC exceeds 1.5 V.

It enables bidirectional voltage translation: inputs accept 0–5.5 V regardless of V_CC (2.7–3.6 V), allowing connection to 5-V logic while driving 3.3-V buses. Output drive strength is ±24 mA per channel at V_CC = 3 V, with ground bounce (V_OLP) < 0.8 V and undershoot (V_OHV) > 2 V under defined conditions.

Key Specifications

Pinout & Package

The SN74LVCZ244AN is available in PDIP-20 (N) package with 2.54 mm lead pitch and 7.62 mm × 19.18 mm body size, compliant with JEDEC MS-001. Pin 1 is marked by a notch or dot; pin 10 is GND, pin 20 is V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244A and 74ALVC244, the SN74LVCZ244AN uniquely combines 5.5-V input tolerance, I_off, and power-up 3-state - making it the only option among the three qualified for hot-swap-capable, mixed-voltage industrial backplanes.

Availability

SN74LVCZ244AN is available at Aetrix Electronics and suitable for server memory subsystems, industrial PLC backplanes, network switch data paths, and PC embedded controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVCZ244AN 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 solutions, with decades of expertise in high-reliability interface ICs for industrial and computing markets.

The SN74LVCZ244AN belongs to TI's LVCZ logic family - engineered specifically for robust mixed-voltage system interfacing, hot-swap readiness, and extended-temperature operation in mission-critical infrastructure.

FAQ

What is the maximum input voltage the SN74LVCZ244AN can tolerate?

The SN74LVCZ244AN accepts input voltages up to 5.5 V regardless of V_CC level (2.7–3.6 V), enabling direct connection to 5-V logic families without external level-shifting circuitry. This specification is verified across –40°C to +125°C and is supported by absolute maximum ratings and electrical characteristics tables in the official TI datasheet SCES274I.

Does the SN74LVCZ244AN support hot insertion?

Yes, the SN74LVCZ244AN supports hot insertion via two integrated features: I_off circuitry that disables outputs when V_CC = 0 V, and power-up 3-state logic that holds outputs in high-impedance until V_CC exceeds 1.5 V. These functions prevent damaging back-current and bus contention during live board replacement - confirmed in TI's Detailed Description section and Application and Implementation guidance.

What is the typical propagation delay of the SN74LVCZ244AN at 3.3 V?

The SN74LVCZ244AN has a maximum propagation delay (t_pd) of 5.9 ns at V_CC = 3.3 V and T_A = 25°C, with typical performance tighter than this limit. This value is measured under standard load conditions (C_L = 30 pF) and applies to both rising and falling edges, as specified in the Switching Characteristics table of the SCES274I datasheet.

Can unused inputs on the SN74LVCZ244AN be left floating?

No, unused inputs on the SN74LVCZ244AN must be tied to either V_CC or GND to prevent undefined logic states and potential increased ICC. TI explicitly recommends this in Section 12.1 (Layout Guidelines) of the datasheet, citing risks of floating CMOS inputs causing oscillation, excess power consumption, or ESD susceptibility.

What package options are available for the SN74LVCZ244AN?

The SN74LVCZ244AN is offered in PDIP-20 (N) package per JEDEC MS-001, with 2.54 mm lead pitch and through-hole mounting. Other variants of the SN74LVCZ244A family include SSOP (DB), SOIC (DW), SO (NS), and TSSOP (PW), but the "N" suffix specifically denotes the plastic dual in-line package - confirmed in TI's Orderable Addendum and mechanical drawings.