Diodes Incorporated PI5C3244SE

Overview

PI5C3244SE from Pericom Semiconductor is an 8-bit, dual-port bus switch IC with two independent 4-bit bidirectional switch banks (1A/1B and 2A/2B), pinout- and function-compatible with 74FCT244T, 74F244, and 74ALS/AS/LS244 logic drivers. It features near-zero propagation delay (0.25 ns), 5 Ω typical on-resistance, ultra-low quiescent current (0.2 µA), and operates at 5 V ±5% over –40°C to +85°C for notebook and low-power embedded bus isolation.

For engineers reviewing the PI5C3244SE datasheet, PI5C3244SE pinout, PI5C3244SE application, or PI5C3244SE equivalent, key selection criteria include its dual active-low enable control (BE1/BE2), direct analog bus connection without added ground bounce, and compatibility with legacy TTL/CMOS logic families in space-constrained SOIC packaging.

Technical Context

The PI5C3244SE implements eight independent FET-based transmission gate switches-four per port-controlled by two separate active-low enable signals (BE1, BE2). Each switch provides a low-impedance path (5 Ω typ.) between A and B terminals when enabled, with no internal logic or level-shifting circuitry.

Its operation relies solely on MOSFET conduction: inputs and outputs are directly connected when enabled, and high-impedance isolated when disabled. The device exhibits no propagation delay beyond RC time constant (≤0.25 ns for 50 pF load) and draws only 0.1–3.0 µA quiescent supply current across temperature and voltage extremes.

Key Specifications

Pinout & Package

PI5C3244SE is housed in a 20-pin 300-mil wide plastic SOIC package (package code S), with exposed leads and standard JEDEC MS-013AC footprint. Pin numbering follows standard SOIC convention: Pin 1 (BE1) at top-left corner, Pin 20 (VCC) at top-right, GND at Pin 11.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3244PWR and 74LVC244APW, the PI5C3244SE delivers superior signal fidelity via zero-delay analog switching, wider voltage tolerance (–0.5 V to +7.0 V), and lower quiescent power-making it optimal for mixed-voltage, high-reliability, and battery-sensitive designs where true bus transparency is required.

Availability

PI5C3244SE is available at Aetrix Electronics and suitable for notebook motherboard design, industrial PLC backplane routing, and PCIe hot-plug isolation requiring stable component supply and long-term manufacturability.

Supply support for PI5C3244SE 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 of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its legacy portfolio remains widely deployed in computing and industrial electronics.

The PI5C3244SE belongs to Pericom's PI5Cxx family of low-voltage, low-RON bus switches designed specifically for transparent, zero-delay signal routing in legacy-compatible embedded systems and portable computing platforms.

FAQ

Is PI5C3244SE compatible with 3.3 V logic systems?

Yes. While optimized for 5 V ±5% operation, the PI5C3244SE accepts input voltages from –0.5 V to +7.0 V and supports bidirectional signal translation between 3.3 V and 5 V domains without level shifters. Its 5 Ω RON and low capacitance ensure signal integrity at 3.3 V logic thresholds.

Does PI5C3244SE require external pull-up or pull-down resistors on BE1/BE2?

No. BE1 and BE2 have internal weak pull-up circuitry (typ. 100 kΩ) ensuring default HIGH (disabled) state when left unconnected. External resistors are unnecessary unless specific timing or noise immunity requirements dictate forced LOW assertion during power-up.

Can PI5C3244SE be used for analog signal switching?

Yes-within limits. Its 5 Ω RON and 12 pF ON-capacitance support DC to ~100 MHz analog signals (e.g., LVDS clock distribution, audio control lines). However, it lacks rail-to-rail input range and is not specified for precision analog use; dedicated analog switches are preferred for >12-bit accuracy or >1 Vpp signals.

What is the maximum capacitive load supported without signal degradation?

At 50 pF load, propagation delay remains ≤0.25 ns. For reliable operation up to 200 MHz, total trace + load capacitance should not exceed 30 pF. Layout best practices-short traces, ground plane proximity, and controlled impedance-maintain signal integrity beyond datasheet-rated conditions.