STMicroelectronics 74LCX00TTR

Overview

74LCX00TTR from STMicroelectronics is a low-voltage CMOS quad 2-input NAND gate with 5V-tolerant inputs, operating from 2.0V to 3.6V supply, delivering 4.3ns max propagation delay at VCC = 3.0–3.6V, ±24mA output drive, and symmetrical output impedance. It serves as a logic-level translation and signal gating component in 3.3V digital systems interfacing with legacy 5V buses.

For engineers reviewing the 74LCX00TTR datasheet, 74LCX00TTR pinout, 74LCX00TTR application, or 74LCX00TTR equivalent, key selection criteria include 5V input tolerance, sub-5ns propagation delay at 3V, PCI-bus-compliant 24mA drive capability, latch-up immunity >500mA, and TSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

This device implements four independent NAND gates using sub-micron C2MOS technology, enabling full 3.3V-speed performance matching 5V AC/ACT families while reducing power consumption. Its input protection circuitry supports direct connection to 5V signals without external level shifters.

The symmetrical |IOH| = IOL = 24mA (min) output drive ensures matched rise/fall times and balanced tPLH ≅ tPHL propagation delays. Power-down protection isolates inputs and outputs when VCC = 0V, preventing back-driving and bus contention in hot-swap or partial-power-down scenarios.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9 × 6.4 × 1.05 mm body height, 0.65 mm pitch, exposed pad not present, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NAND gate applications.

Compared with SN74LVC00APWR and 74ALVC00PW,118, the 74LCX00TTR uniquely balances 5V input tolerance, 4.3ns timing, and 10µA ICC - making it optimal for mixed-voltage industrial interfaces where reliability trumps marginal speed gains.

Availability

74LCX00TTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, PCI bus interface logic, and low-power handheld devices requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LCX00TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LCX logic family targets low-voltage, high-speed 3.3V digital systems requiring 5V signal compatibility, emphasizing robustness, timing precision, and power efficiency in space-constrained applications.

FAQ

Is 74LCX00TTR pin-compatible with standard 74LS00 or 74HC00?

Yes - it is pin- and function-compatible with the 74-series 00 NAND gate family, including 74LS00 and 74HC00, in TSSOP-14 packaging. All 14 pins map identically: inputs on pins 1/2/4/5/9/10/12/13, outputs on 3/6/8/11, GND on 7, and VCC on 14. No board redesign is needed for drop-in replacement in existing footprints.

Can 74LCX00TTR safely drive a 50Ω transmission line?

No - its ±24mA output drive is rated for CMOS/TTL fanout and PCI-bus loads (typically 500Ω), not 50Ω RF termination. Driving 50Ω directly would exceed VOL/VOH specifications and cause excessive power dissipation. Use a dedicated line driver or buffer IC for controlled-impedance signaling.

What is the maximum input frequency supported for reliable NAND operation?

While not explicitly specified as a maximum frequency, the 4.3ns max propagation delay supports reliable toggling up to ~100MHz in typical fanout-1 conditions. For sustained operation, ensure input rise/fall times meet dt/dv ≤10ns/V and maintain proper VCC decoupling to avoid metastability or timing violations.

Does 74LCX00TTR support partial power-down (e.g., VCC = 0V while inputs active)?

Yes - its power-down protection ensures inputs and outputs enter high-impedance states when VCC = 0V, preventing back-current flow and bus contention. Input voltage may safely reach up to +7.0V during this condition, making it suitable for hot-swap and modular backplane applications.