PCA9646

更新时间： 2024-11-14 12:20:23

品牌	Logo	应用领域
恩智浦 - NXP		开关
页数	文件大小	规格书
22页	423K
描述
Buffered 4-channel 2-wire bus switch

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PCA9646 数据手册

PCA9646

Buffered 4-channel 2-wire bus switch

Rev. 1 — 1 March 2011

Product data sheet

1. General description

The PCA9646 is a monolithic CMOS integrated circuit for 2-wire bus buffering and

switching in applications including I²C-bus, SMBus, PMBus, and other systems based on

similar principles.

Each of the four outputs may be independently enabled in any combination as determined

by the contents of the programmable control register. Each I/O is impedance isolated from

all others, thus allowing a total of five branches of 2-wire bus with the maximum specified

load (e.g., 5  400 pF for Fm+ I²C-bus at 1 MHz, or 5  4 nF at lower frequencies)

(Ref. 1). More than one PCA9646 may be used in series, providing a substantial fan-out

capability.

As per the PCA9525 and PCA9605 simple bus buffers, the PCA9646 includes a

unidirectional buffer for the clock signal, and a bidirectional buffer for the data signal. The

direction of the clock signal may also be set by the contents of the programmable control

The PCA9646 has excellent application to 2-wire bus address expansion and increasing

of maximum load capacitance. Very large LED displays are a perfect example.

2. Features and benefits

 Drop-in pin compatible with PCA9546A, etc.

 Each I/O is impedance isolated from all others allowing maximum capacitance on all

branches

 30 mA static sink capability on all ports

 Works with I²C-bus (Standard-mode, Fast-mode, and Fast-mode Plus (Fm+)),

SMBus (standard and high power mode), and PMBus

 Fast switching times allow operation in excess of 1 MHz

 Allows driving of large loads (e.g., 5  4 nF)

 Hysteresis on I/O increases noise immunity

 Operating voltages from 2.7 V to 5.5 V

 Uncomplicated characteristics suitable for quick implementation in most common

2-wire bus applications

3. Applications

 Large arrays of I²C-bus components, e.g., LED displays

 Power management systems

 Game consoles, computers, RAID systems

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