Diodes Incorporated PI4MSD5V9547LE

Overview

PI4MSD5V9547LE from Diodes Incorporated is an 8-channel I²C-bus multiplexer with active-low reset, designed to isolate and route I²C signals between one upstream bus (SDA/SCL) and eight downstream channels (SD0–SD7/SC0–SC7). It operates from 1.65 V to 5.5 V, supports Standard- and Fast-mode I²C (up to 400 kHz), features <1 µA standby current, and enables dynamic channel selection via I²C control register or hardware address pins (A0–A2). It is used in server management systems to isolate multiple temperature sensors sharing a single I²C host.

For engineers reviewing the PI4MSD5V9547LE datasheet, PI4MSD5V9547LE pinout, PI4MSD5V9547LE application, or PI4MSD5V9547LE equivalent, key selection criteria include its 8-channel routing capability, 4–9 Ω typical ON-resistance at 4.5–5.5 V, integrated power-on reset, low-voltage operation down to 1.65 V, and TSSOP-24 package compatibility with high-density PCB layouts.

Technical Context

The PI4MSD5V9547LE implements a bidirectional, voltage-level-translating pass-gate architecture for I²C signal routing-no internal buffering or protocol interpretation. Channel selection is performed either through I²C write commands to its 8-bit control register (addressed at 0x70–0x77) or via hardware address inputs A0–A2, enabling up to eight devices on one bus.

It includes an active-low RESET input that forces all channels off and clears the control register to default (channel 0 enabled), with a minimum 4 ns low pulse width requirement. The device maintains I²C timing compliance-including tSU:STA, tHD:STA, and tBUF-across 1.65–5.5 V supply range and supports mixed-voltage I²C domains via independent VCC-referenced I/O thresholds.

Key Specifications

Pinout & Package

PI4MSD5V9547LE is housed in a RoHS-compliant, lead-free 24-pin TSSOP (173 mil wide) package with exposed thermal pad (package code L), optimized for automated assembly and thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C multiplexer applications.

Compared with TCA9548A and PCA9546A, PI4MSD5V9547LE uniquely combines 8-channel routing, hardware RESET, and 4–9 Ω Ron in a single TSSOP-24 package-offering superior fault recovery, mixed-voltage flexibility, and board-space efficiency for high-channel-count I²C systems.

Availability

PI4MSD5V9547LE is available at Aetrix Electronics and suitable for server BMCs, industrial PLC backplanes, automotive body controllers, and medical diagnostic equipment requiring stable component supply and long-term design-in support.

Supply support for PI4MSD5V9547LE 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for power management, signal integrity, and connectivity applications.

The PI4MSD5V9547LE belongs to Diodes' I²C interface and signal routing product line, engineered specifically for scalable, fault-tolerant I²C expansion in resource-constrained embedded systems-from datacenter infrastructure to safety-critical edge devices.

FAQ

What is the function of the RESET pin on PI4MSD5V9547LE?

The RESET pin is an active-low asynchronous input that forces all eight downstream channels into high-impedance isolation and resets the internal control register to its default state (channel 0 enabled). A minimum 4 ns low pulse is required, and it operates independently of VCC sequencing-ensuring reliable recovery from bus lockups or power glitches without host intervention.

Can PI4MSD5V9547LE operate with different voltage levels on upstream and downstream I²C buses?

No-the PI4MSD5V9547LE uses a single VCC supply to bias all I/O structures, so upstream (SDA/SCL) and downstream (SDx/SCx) buses must share the same logic voltage domain. However, its wide 1.65–5.5 V operating range allows use with 1.8 V, 2.5 V, 3.3 V, or 5 V systems, and its pass-gate architecture inherently supports level translation between devices operating at different voltages on the same bus segment.

How does channel selection work when both A0–A2 pins and the I²C control register are used?

A0–A2 set the device's I²C slave address (0x70–0x77) but do not affect channel selection. Channel enable/disable is exclusively controlled by writing to the 8-bit control register via I²C-bit B0–B3 select channels 0–7, and bits B4–B7 are reserved. Hardware address pins only determine which device responds to the host's I²C write command; they do not override register-based routing logic.

Is PI4MSD5V9547LE compatible with Fast-mode Plus (1 MHz) I²C?

No-PI4MSD5V9547LE is specified for Standard-mode (100 kHz) and Fast-mode (400 kHz) I²C only. Its AC timing parameters-including tPD (0.3 ns), tr (≤300 ns), and tf (≤300 ns)-meet Fast-mode requirements but not Fast-mode Plus, which mandates tighter rise/fall time (<120 ns) and higher drive strength. Using it beyond 400 kHz may violate setup/hold timing and cause ACK failures.