Diodes Incorporated PI5C34X245B

Overview

PI5C34X245B from Pericom Semiconductor is a 32-bit, 2-port bus switch with four independent active-low bus enable inputs (BE1–BE4), 5 Ω typical on-resistance, near-zero propagation delay (0.25 ns), and ultra-low quiescent current (0.2 μA typical) for notebook and portable system power gating. It provides direct A↔B signal path continuity when enabled and high-impedance isolation when disabled.

For engineers reviewing the PI5C34X245B datasheet, PI5C34X245B pinout, PI5C34X245B application, or PI5C34X245B equivalent, key selection criteria include 32-bit bidirectional switching capability, industrial temperature range (–40°C to +85°C), BQSOP-80 package compatibility, and low-noise, low-power bus isolation in memory expansion and peripheral multiplexing designs.

Technical Context

The PI5C34X245B implements four independent 8-bit switch banks (BE1–BE4), each controlling eight A/B bidirectional pairs (e.g., BE1 enables A0–A7 ↔ B0–B7). Each switch operates as a voltage-controlled MOS pass gate with no level-shifting or buffering-preserving signal integrity and timing transparency.

It requires a single 5 V ±10% supply, draws ≤3 μA quiescent current, and exhibits 6 pF input capacitance and 12 pF on-state A/B capacitance. Propagation delay is dominated by RC time constant (RON × CL), not internal logic, enabling sub-nanosecond signal pass-through under 50 pF load.

Key Specifications

Pinout & Package

Package: 80-pin BQSOP (150-mil wide), Pb-free & Green compliant, body size 20.4 mm × 6.2 mm × 2.0 mm, 0.5 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit bidirectional bus switch applications.

Compared with PI5C3257B and SN74CBT3245APM, the PI5C34X245B uniquely delivers per-bank enable control, 5 V operation, and lowest RON in a 32-bit configuration-making it optimal for memory expansion and multi-peripheral arbitration where timing, voltage, and isolation granularity are jointly critical.

Availability

PI5C34X245B is available at Aetrix Electronics and suitable for notebook power management, industrial backplane interconnect, memory expansion interface, and peripheral multiplexing requiring stable component supply and long-term lifecycle support.

Supply support for PI5C34X245B 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, timing, and signal-integrity solutions for computing and communications infrastructure.

The PI5C34X245B belongs to Pericom's 32-bit bus switch product line, engineered specifically for low-latency, low-power, and noise-immune signal routing in portable and industrial embedded systems with strict thermal and EMI constraints.

FAQ

What is the maximum capacitive load the PI5C34X245B can drive while maintaining specified propagation delay?

The device is characterized for CL = 50 pF, where tPLH/tPHL is guaranteed at 0.25 ns. At higher loads (e.g., 100 pF), delay increases linearly per RC time constant (RON × CL); with 5 Ω RON, 100 pF yields ~0.5 ns added delay. System-level validation is required above 50 pF, but no degradation in functionality occurs.

Can BE1–BE4 be driven by 3.3 V logic in a 5 V system?

Yes. VIH is specified at 2.0 V minimum, and VIL at 0.8 V maximum. A 3.3 V CMOS driver meets both thresholds with margin. No level shifter is needed, and the control inputs draw only ±1 μA, minimizing loading on the 3.3 V source.

Does the PI5C34X245B support hot-swap or live-insertion?

It supports hot-swap in the sense that its high-impedance OFF state prevents backfeeding, and its 5 Ω RON ensures no latch-up under transient overvoltage. However, it lacks built-in slew-rate control or fault protection-external series resistors and TVS diodes are recommended for robust live-insertion in backplane applications.

How does the PI5C34X245B handle simultaneous switching of all 32 bits?

With six dedicated GND pins and distributed VCC, ground bounce is minimized. ICC remains ≤3 μA quiescent; dynamic supply current scales linearly with toggling frequency (0.25 mA/MHz per control input). A/B pins contribute no AC current-only the BE inputs draw switching current, simplifying power rail design.