Diodes Incorporated PI5C162861BE

Overview

PI5C162861BE from Pericom Semiconductor is a 20-bit, 2-port bus switch with integrated 25Ω series termination resistors per channel, designed for high-speed bidirectional data routing between Bus A (A19–A0) and Bus B (B19–B0) in 5V systems. It features near-zero propagation delay (1.25 ns), ultra-low quiescent current (0.2 µA typical), and industrial temperature operation (–40°C to +85°C), enabling use in notebook memory expansion and PCI/ISA bus isolation.

For engineers reviewing the PI5C162861BE datasheet, PI5C162861BE pinout, PI5C162861BE application, or PI5C162861BE equivalent, key selection criteria include on-resistance (20–40 Ω at V_IN = 0 V), bus enable timing (t_PZH/t_PLZ ≤ 6.5 ns), input hysteresis (150 mV), and built-in 25Ω termination eliminating external resistors in point-to-point parallel buses.

Technical Context

This device implements a flow-through, non-inverting, dual-bus architecture where two independent 20-bit channels are controlled by active-low Bus Enable inputs (BE1, BE2). Each channel connects A_n ↔ B_n directly when enabled, with no logic translation or buffering-only passive FET-based switching.

The PI5C162861BE variant integrates 25Ω series resistors on all 20 A-side and 20 B-side signal paths to dampen reflections in high-speed parallel buses, distinguishing it from the 5Ω PI5C16861 family. Its 48-pin BQSOP package supports compact layout with pin-compatible placement across TSSOP/SSOP/BQSOP variants.

Key Specifications

Pinout & Package

PI5C162861BE is housed in a 48-pin, 150-mil wide plastic BQSOP (Body Quad Small Outline Package) with 0.5 mm pitch, RoHS-compliant and Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit bus switch applications.

Compared with PI5C16861BE and SN74CBT16212DGGR, PI5C162861BE uniquely delivers 20-bit width, integrated 25Ω termination, and dual independent bus enables in a single BQSOP package-reducing component count and improving signal integrity in dense parallel bus designs.

Availability

PI5C162861BE is available at Aetrix Electronics and suitable for PCI bus isolation, notebook memory expansion, ISA-to-PCI bridge interface, and industrial control backplane applications requiring stable component supply and long-term lifecycle support.

Supply support for PI5C162861BE 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 bus switch portfolio remains widely deployed in industrial and computing platforms.

The PI5Cxx861 family targets high-speed parallel bus isolation and expansion in 5V systems, emphasizing low R_ON, zero-delay signal pass-through, and layout-friendly packaging for embedded computing and peripheral interfacing.

FAQ

What is the function of the BE1 and BE2 pins on PI5C162861BE?

BE1 and BE2 are active-low bus enable inputs that independently control two 10-bit sub-groups: BE1 enables A0–A9 ↔ B0–B9, and BE2 enables A10–A19 ↔ B10–B19. When asserted low, each pair connects its respective bus segment with 25Ω series resistance; when high, both sides enter high-impedance state. This allows partial bus isolation without disabling the entire 20-bit path.

Can PI5C162861BE operate at 3.3V supply voltage?

No. PI5C162861BE is specified only for V_CC = 4.5 V to 5.5 V operation per its DC electrical characteristics table. Attempting 3.3V operation results in undefined R_ON, unreliable switching thresholds, and potential failure to meet t_PZH/t_PLZ timing. For 3.3V systems, consider Diodes Inc.'s PI3CHxx series or ON Semiconductor's NL17SZ series bus switches.

Does PI5C162861BE require external pull-up or pull-down resistors on BE pins?

External biasing is not required but recommended for robust noise immunity. The BE inputs have TTL-compatible thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and 150 mV hysteresis. In electrically noisy environments or long trace runs, a 10 kΩ pull-down resistor ensures defined low state during power-up or floating conditions, preventing unintended bus connection.

How does the 25Ω series resistor affect signal rise time in PI5C162861BE?

The 25Ω resistor works with load capacitance (e.g., 50 pF typical) to form an RC filter with τ ≈ 1.25 ns, which slightly rounds edges but suppresses ringing caused by impedance mismatch. Measured propagation delay remains 1.25 ns (CL = 50 pF), confirming the resistor does not degrade timing-instead, it improves eye diagram margin in unterminated parallel buses operating up to 133 MHz.