Diodes Incorporated PI5C16244AE

Overview

PI5C16244AE from Pericom Semiconductor is a 16-bit, 4-port CMOS bus switch with near-zero propagation delay (0.25 ns), 5 Ω typical on-resistance, and ultra-low quiescent current (0.2 µA). It provides direct, low-noise bidirectional signal routing between four independent A/B bus pairs under individual active-low enable control (nBE), and is widely used in notebook PC memory expansion and hot-swap I/O isolation.

For engineers reviewing the PI5C16244AE datasheet, PI5C16244AE pinout, PI5C16244AE application, or PI5C16244AE equivalent, key selection criteria include its 5 Ω R_ON, 0.25 ns t_PLH/t_PHL, industrial temperature range (–40°C to +85°C), TSSOP-48 Pb-free packaging, and pin compatibility with 74-series 16244 drivers.

Technical Context

The PI5C16244AE implements four independent 4-bit bidirectional analog switches, each controlled by a dedicated active-low bus enable (nBE) input. Each switch path connects corresponding A and B pins with no level-shifting or logic inversion-only passive resistive conduction when enabled.

Its architecture eliminates ground bounce and adds negligible RC delay (≈0.25 ns for 50 pF load), making it suitable for high-speed digital bus isolation where signal integrity and timing transparency are critical. All I/O pins tolerate –0.5 V to +7.0 V, supporting mixed-voltage domain interfacing.

Key Specifications

Pinout & Package

PI5C16244AE is packaged in a Pb-free, green-compliant 48-pin TSSOP (240 mil width, JEDEC MO-153), with 0.5 mm pitch and exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16244DGGR and 74FST16244MTDX, the PI5C16244AE delivers the lowest R_ON and quiescent current in this pin-compatible class-critical for portable systems requiring <1 µA standby budget and sub-ns timing fidelity.

Availability

PI5C16244AE is available at Aetrix Electronics and suitable for notebook PC design, memory expansion modules, and hot-swap I/O interfaces requiring stable component supply, RoHS compliance, and long-term lifecycle assurance.

Supply support for PI5C16244AE 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 was a fabless provider specializing in high-speed interface and timing solutions before its acquisition by Diodes Incorporated in 2016; its legacy bus switch portfolio remains widely deployed in computing and communications infrastructure.

The PI5C16244AE belongs to Pericom's PI5C family of low-R_ON, low-delay CMOS bus switches designed specifically for transparent signal routing in portable and high-density digital systems.

FAQ

What is the maximum capacitive load the PI5C16244AE can drive while maintaining specified propagation delay?

The device is characterized for CL = 50 pF and RL = 500 Ω, yielding 0.25 ns t_PLH/t_PHL. At higher loads (e.g., 100 pF), delay increases linearly per RC time constant (RON × CL); with 5 Ω R_ON, 100 pF adds ≈0.5 ns intrinsic delay. System-level rise/fall times dominate total delay beyond 100 pF.

Can PI5C16244AE be used to isolate 3.3 V and 5 V logic domains?

Yes-the I/O pins tolerate –0.5 V to +7.0 V regardless of V_CC level, and the switch operates passively. With V_CC = 5 V, it safely passes 3.3 V signals in either direction without level shifting or clamping, provided no external voltage exceeds the absolute maximum ratings.

Does PI5C16244AE require external pull-up or pull-down resistors on nBE inputs?

No-nBE inputs have ±1 µA leakage over temperature and do not require external biasing. However, floating nBE pins will default to HIGH (switch OFF) due to internal weak pull-up structure; for deterministic startup, tie unused nBE pins to V_CC or GND via PCB trace.

How does PI5C16244AE handle simultaneous switching noise (SSN) compared to traditional buffer-based isolation?

Unlike active buffers, the PI5C16244AE introduces no ground bounce because it lacks output drivers or internal latches. Its MOSFET-based switch draws zero dynamic current during signal transitions-only static leakage-and avoids the current spikes that cause SSN in CMOS buffers.