Diodes Incorporated PI74VCX16373AE

Overview

PI74VCX16373AE from Pericom Semiconductor is a 16-bit transparent D-type latch with 3-state outputs, designed for bidirectional bus driving, I/O port buffering, and working register functions in mixed-voltage systems. It operates from 1.8V to 3.6V VDD, supports 3.6V-tolerant I/O, delivers ±24mA drive strength, and features live insertion capability. Used in industrial control backplanes and memory interface data latching.

For engineers reviewing the PI74VCX16373AE datasheet, PI74VCX16373AE pinout, PI74VCX16373AE application, or PI74VCX16373AE equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 5.1ns at VDD = 3.3V), I/O voltage tolerance, latch enable polarity (active-HIGH), and TSSOP-48 thermal performance in –40°C to +85°C environments.

Technical Context

This device implements two independent 8-bit transparent latches, each with dedicated Latch Enable (LE) and Output Enable (OE) controls. The latch function is edge-independent: Q follows D while LE is HIGH; outputs freeze on LE transition to LOW. OE operates asynchronously and independently of LE, placing outputs in high-impedance without affecting internal latch state.

All inputs and outputs are 3.6V-tolerant across the full 1.8V–3.6V supply range, enabling interoperability between 1.8V logic and 3.3V buses. Propagation delay skew between any two outputs is specified ≤ 5.0ns, ensuring deterministic timing in parallel data paths. Power-off high-impedance behavior is guaranteed on both inputs and outputs.

Key Specifications

Pinout & Package

Package: 48-pin TSSOP (A), 12.6mm × 6.2mm × 1.2mm body, Pb-free & Green (RoHS-compliant), JEDEC MO-153AC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transparent latch applications.

Compared with SN74LVC16373ADGGR and 74ALVC16373PW, PI74VCX16373AE uniquely guarantees robust 1.8V operation with full 3.6V I/O tolerance and lower typical supply current - making it optimal for energy-constrained industrial edge nodes requiring mixed-voltage resilience.

Availability

PI74VCX16373AE is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, and hot-swappable module control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI74VCX16373AE 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-speed interface, timing, and logic solutions for communications and computing infrastructure.

The PI74VCX family targets low-voltage, mixed-supply digital systems - specifically engineered for voltage-tolerant bus interfacing, I/O expansion, and latch-based data synchronization in industrial and telecom equipment.

FAQ

What is the recommended power-up sequence for PI74VCX16373AE?

OE should be tied to VDD through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance during power-up. No specific VDD ramp rate is required; the device enters power-off high-Z state automatically below 0.8V VDD, preventing bus contention.

Can PI74VCX16373AE operate with VDD = 2.5V while interfacing to a 3.3V microcontroller?

Yes. Its 3.6V I/O tolerance allows all inputs and outputs to safely accept and drive 3.3V logic levels while powered from 2.5V. Input thresholds scale with VDD, and output VOH/VOL meet 3.3V-compatible levels per DC specs - no external level shifters needed.

How does the latch behavior differ between LE HIGH and LE LOW states?

When LE is HIGH, Q outputs track D inputs transparently with propagation delay ≤5.1ns. When LE goes LOW, Q freezes at the last D value present at the falling edge - subsequent D changes have no effect until LE returns HIGH. This enables precise data capture synchronized to control signals.

Is PI74VCX16373AE pin-compatible with older PI74FCT16373 devices?

No. While both are 16-bit latches in 48-pin TSSOP, PI74FCT16373 uses different pin assignments (e.g., OE placement, VDD/GND count) and lacks 1.8V operation and 3.6V I/O tolerance. Direct replacement requires PCB layout revision and validation of timing under new voltage conditions.