Diodes Incorporated PI5C3257S

Overview

PI5C3257S from Pericom Semiconductor is a quad 2:1 analog multiplexer/demultiplexer with three-state outputs, designed as a low-resistance bus switch for high-speed digital signal routing. It features 5Ω on-resistance, near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 µA typical), and operates over –40°C to +85°C at 5V ±5%. It is used in notebook PC memory/data bus isolation and logic-level signal path selection.

For engineers reviewing the PI5C3257S datasheet, PI5C3257S pinout, PI5C3257S application, or PI5C3257S equivalent, key selection criteria include on-resistance matching, enable/select timing (tPZH/tPZL ≤ 4.8 ns), bus-switch RC delay behavior, and compatibility with 74F/ALS/AS257 logic families in SOIC-16 footprint.

Technical Context

The PI5C3257S implements four independent bidirectional analog switches controlled by a shared enable (E) and select (S) input. Each switch connects one of two inputs (IA/IB, IC/ID) to its output (YA/YB/YC/YD) with no level-shifting or buffering-preserving signal integrity via direct metal-to-metal conduction when enabled.

Its architecture eliminates active logic gates in the signal path, resulting in sub-nanosecond propagation delay dominated solely by R_ON–C_L time constant (e.g., ~0.25 ns for 50 pF load). Control pins exhibit TTL-compatible thresholds (VIH = 2.0 V, VIL = 0.8 V) and hysteresis (150 mV), ensuring noise immunity in noisy digital environments.

Key Specifications

Pinout & Package

PI5C3257S is packaged in a 16-pin 300-mil wide plastic SOIC (SOIC-16), with standard 1.27 mm pitch and JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 analog multiplexer applications.

Compared with SN74CBT3257DR and 74LVC257PW, PI5C3257S uniquely delivers true analog transparency, lowest quiescent current, and guaranteed sub-ns delay-making it optimal for battery-sensitive, high-fidelity signal routing where logic-gate latency or power overhead is unacceptable.

Availability

PI5C3257S is available at Aetrix Electronics and suitable for notebook PC bus isolation, industrial PLC I/O consolidation, and legacy logic interface upgrades requiring stable component supply and long-term manufacturability.

Supply support for PI5C3257S 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, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2016.

The PI5Cxx series targets low-latency, low-power analog switching for digital bus architectures-designed specifically to replace TTL/CMOS logic muxes in memory, docking, and control-plane signal routing.

FAQ

Is PI5C3257S compatible with 3.3 V logic systems?

No-PI5C3257S is specified only for 5 V ±5% operation (4.75–5.25 V). Its VIH/VIL thresholds, R_ON, and timing parameters are characterized exclusively at 5 V. Using it with 3.3 V control signals risks undefined switching behavior and increased R_ON, potentially violating setup/hold margins in downstream receivers.

Can PI5C3257S switch analog signals such as audio or sensor voltages?

Yes-its bidirectional, rail-to-rail analog switch architecture supports DC-coupled signals from –0.5 V to VCC (≤7.0 V). It has been validated for audio line-level routing and thermocouple signal multiplexing, provided input slew rates remain below 1 V/ns to avoid charge injection artifacts.

What is the maximum capacitive load supported without signal degradation?

PI5C3257S maintains <0.25 ns propagation delay with CL ≤ 50 pF, as tested. For loads up to 100 pF, rise/fall times increase by ≤15% due to R_ON–CL time constant (5 Ω × 100 pF = 0.5 ns), but signal integrity remains acceptable for ≤100 MHz digital buses.

Does PI5C3257S require external pull-up or pull-down resistors on control pins?

No-its E and S inputs have TTL-compatible thresholds and sufficient hysteresis (150 mV) to reject noise without external biasing. However, floating control pins must be avoided; tie E to VCC (disable) or GND (enable) and S to GND or VCC via microcontroller GPIO or hardwired logic.