Diodes Incorporated PI74ALVCH162601A

Overview

PI74ALVCH162601A from Pericom Semiconductor is an 18-bit universal bus transceiver with 3-state outputs, D-type latches and flip-flops, dual-directional data flow control (A↔B), bus hold on all inputs, and 26Ω series resistors on B-port outputs. It operates from 2.3V to 3.6V and supports transparent, latched, and clocked modes in industrial temperature range (–40°C to +85°C), used in high-speed backplane and memory interface applications.

For engineers reviewing the PI74ALVCH162601A datasheet, PI74ALVCH162601A pinout, PI74ALVCH162601A application, or PI74ALVCH162601A equivalent, key selection criteria include bidirectional timing control (CLKAB/CLKBA, LEAB/LEBA, OEAB/OEBA), VCC tolerance (2.3–3.6V), bus-hold retention, and TSSOP-56 package compatibility with signal integrity features like output series termination.

Technical Context

The PI74ALVCH162601A implements independent A-to-B and B-to-A data paths using separate clock (CLKAB/CLKBA), latch enable (LEAB/LEBA), output enable (OEAB/OEBA), and clock enable (CLKENAB/CLKENBA) controls - enabling asynchronous or synchronous bidirectional operation. Each direction supports transparent mode (LE HIGH), edge-triggered latching (LE LOW + CLK transition), and 3-state output control.

It integrates bus-hold circuitry on all I/O pins to maintain last valid logic state during high-impedance conditions, eliminating external pull resistors. B-port outputs feature integrated 26Ω series resistors to suppress overshoot/undershoot, while power-up/down high-impedance safety requires OE tied to VCC via pull-up resistor.

Key Specifications

Pinout & Package

PI74ALVCH162601A is packaged in a 56-pin plastic TSSOP (240 mil wide, "A" suffix), with 18 bidirectional data lines per port (A0–A17, B0–B17), dual clock/latch/enable control sets, and dedicated power/ground pins distributed for noise reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal bus transceiver applications.

Compared with SN74ALVTH16260DGGR and 74LVC16245APAG, the PI74ALVCH162601A uniquely combines bus-hold, B-port series termination, and dual independent control logic in a single 56-pin TSSOP - reducing component count and layout complexity for industrial backplane and memory interface designs.

Availability

PI74ALVCH162601A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA configuration bridges, and memory interface subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for PI74ALVCH162601A 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 and timing solutions, with expertise in low-voltage logic, signal integrity, and mixed-signal IC design for communications and computing infrastructure.

The PI74ALVCH series targets high-speed parallel bus applications demanding low skew, robust noise immunity, and simplified board-level design - particularly in industrial, telecom, and embedded systems where reliability and BOM reduction are critical.

FAQ

What is the function of CLKENAB and CLKENBA inputs?

CLKENAB and CLKENBA are active-low clock enable inputs that gate the respective CLKAB and CLKBA signals. When CLKENAB is LOW, CLKAB is passed to the internal latch/flip-flop; when HIGH, CLKAB is blocked and the latch holds its current state. This allows dynamic clock gating without disrupting latch contents, supporting power-aware data flow control in synchronous systems.

Can PI74ALVCH162601A operate with VCC = 2.5V?

Yes - the device is fully specified from 2.3V to 3.6V. At VCC = 2.5V, propagation delay increases to ≤17.5ns (A→B), output drive reduces to ±18mA, and bus-hold current drops to ±4.2mA, all within guaranteed limits. It maintains full functionality and timing compliance across this range, making it compatible with 2.5V ASIC and FPGA interfaces.

How does the bus-hold feature interact with 3-state outputs?

Bus-hold remains active on all inputs (A0–A17, B0–B17) regardless of OE state. When OEAB = HIGH (A-port outputs disabled), bus-hold retains the last valid logic level on A-inputs, preventing floating states that could cause leakage current or false triggering. This eliminates need for external pull resistors even during extended 3-state periods.

Is the TSSOP-56 package RoHS-compliant?

Yes - the PI74ALVCH162601A "A" suffix denotes the lead-free, RoHS-compliant 56-pin TSSOP package, with matte tin (Sn) lead finish and halogen-free molding compound. It meets JEDEC J-STD-020D reflow profile requirements and is rated for MSL-3 handling per J-STD-020.