Diodes Incorporated PI74ALVTC16373A

Overview

PI74ALVTC16373A 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, supports 3.6V I/O tolerance, delivers ±64mA output drive at 3.3V, and features Bus Hold and power-off high-impedance I/O-enabling robust operation in hot-swap and industrial bus applications.

For engineers reviewing the PI74ALVTC16373A datasheet, PI74ALVTC16373A pinout, PI74ALVTC16373A application, or PI74ALVTC16373A equivalent, key selection criteria include latch enable timing (tELH ≤ 1.3ns), 3-state enable/disable delays (tZHP/tLZP ≤ 5.4ns), I/O voltage tolerance (3.6V max), Bus Hold functionality, and compatibility with 48-pin TSSOP (A), TVSOP (K), and SSOP (V) packages.

Technical Context

This device implements two independent 8-bit transparent latches or one unified 16-bit latch, where Q outputs follow D inputs when Latch Enable (LE) is HIGH and retain data when LE transitions LOW. The Output Enable (OE) input is active-low and fully decoupled from internal latch operation-allowing data retention or updates while outputs remain in high-impedance state.

It uses advanced 0.35µm CMOS technology with patented noise reduction circuitry, enabling stable operation across –40°C to +85°C. Its I/O-tolerant architecture permits direct interfacing between 1.8V logic cores and 3.3V/3.6V buses without level shifters, while Bus Hold eliminates external pull resistors by latching floating input states.

Key Specifications

Pinout & Package

PI74ALVTC16373A is packaged in a 48-pin plastic TSSOP (A), measuring 240 mil wide, with 0.5mm pitch and exposed thermal pad (not electrically connected). Pin numbering follows standard dual-row counterclockwise layout starting from top-left corner (Pin 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16373DGGR and 74LVC16373APAG, PI74ALVTC16373A uniquely combines 3.6V I/O tolerance on both inputs and outputs, integrated Bus Hold, and guaranteed power-off high-impedance-making it the only choice for industrial hot-swap and mixed-voltage bus isolation where reliability trumps marginal cost savings.

Availability

PI74ALVTC16373A is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card I/O expansion, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and verified mixed-voltage interoperability.

Supply support for PI74ALVTC16373A 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 (now part of Diodes Incorporated) specialized in high-speed interface, timing, and logic solutions for communications, computing, and industrial markets before its 2016 acquisition.

The PI74ALVTC series was engineered specifically for low-voltage, high-drive, mixed-signal bus interfacing-addressing design challenges in hot-pluggable systems, voltage-domain bridging, and noise-sensitive parallel data paths.

FAQ

Can PI74ALVTC16373A operate with VDD = 1.8V while interfacing to a 3.3V bus?

Yes. Its 3.6V I/O tolerance allows all inputs and outputs to safely accept and drive 3.3V signals even when powered at 1.8V. This eliminates external level shifters in mixed-voltage systems. The Bus Hold feature further stabilizes un-driven inputs at valid logic levels without pull resistors.

What is the maximum clock rate supported for transparent latch operation?

With tPLH/tPHL ≤ 5.2ns and tELH ≤ 1.3ns at VDD = 3.3V, the device supports reliable transparent operation up to approximately 100MHz for synchronous bus applications. For latch-capture use cases, setup/hold times (tSU = 5.0ns, tH = 8.0ns) define the maximum toggle rate of the LE signal.

How does Bus Hold function interact with OE and LE controls?

Bus Hold operates independently on all 16 inputs regardless of OE or LE state-it continuously monitors and retains the last valid logic level on floating D inputs. OE affects only Q outputs; LE controls data capture. All three functions coexist without interference, enabling flexible timing and robust signal integrity.

Is external pull-up required on OE for power-up safety?

Yes. To guarantee outputs start in high-impedance state during power-up, OE must be tied to VDD via a pull-up resistor. The minimum resistance is determined by the driver's sink capability; Pericom recommends ≥10kΩ for typical 3.3V systems, ensuring fast, deterministic initialization without excessive current draw.