PCA9525 Simple 2-wire bus buffer

The PCA9525 is a monolithic CMOS integrated circuit for bus buffering in applications including I²C-bus, SMBus, DDC, PMBus, and other systems based on similar principles.

The buffer extends the bus load limit by buffering both the SCL and SDA lines, allowing the maximum permissible bus capacitance on both sides of the buffer.

The PCA9525 includes a unidirectional buffer for the clock signal, and a bidirectional buffer for the data signal. Slave devices which employ clock stretching are therefore not supported.

In its most basic implementation, the buffer will allow an extended number of slave devices to be attached to one (or more) master devices. In this case, all master devices would be positioned on the Sxx_IN side of the PCA9525.

The direction pin (DIR) further enhances this function by allowing the unidirectional clock signal to be reversed, thus allowing master devices on both sides of the buffer.

The enable (EN) function allows sections of the bus to be isolated. Individual parts of the system can be brought on-line successively. This means a controlled start-up using a diverse range of components, operating speeds and loads is easily achieved.

产品特点 Features

Simple impedance isolating buffer for 2-wire buses
4 mA maximum static open-drain pull-down capability supports a wide range of bus standards
Works with I²C-bus (Standard-mode, Fast-mode), SMBus (standard and high power mode), and PMBus
Fast switching times allow operation in excess of 1 MHz
Enable allows bus segments to be disconnected
Hysteresis on inputs provides noise immunity
Operating voltages from 2.7 V to 5.5 V
Very low supply current
Uncomplicated characteristics suitable for quick implementation in most common 2-wire bus applications

应用

Electronic signs and displays
Game consoles/boxes
Gaming machine networks
TV/projector/monitor interconnection (DDC)
Power management systems
Desktop and portable computers
Security systems

功能框图

封装

型号	可订购的器件编号	订购码 (12NC)	产品状态	封装
PCA9525D	9352 927 08118	PCA9525D,118	量产	SO8 (SOT96-1)
PCA9525DP	9352 927 47118	PCA9525DP,118	量产	TSSOP8 (SOT505-1)

订货和供应

型号	订购码 (12NC)	可订购的器件编号	化学成分
PCA9525D	9352 927 08118	PCA9525D,118	PCA9525D
PCA9525DP	9352 927 47118	PCA9525DP,118	PCA9525DP

PCA9525 技术支持

档案名称	标题	类型	格式
PCA9525	Simple 2-wire bus buffer	Data sheet	pdf
AN10441	Level shifting techniques in I2C-bus design	Application note	pdf
AN255	I2C / SMBus Repeaters, Hubs and Expanders	Application note	pdf
AN10710	Features and applications of the PCA9525 I2C-bus extender	Application note	pdf
75016527	Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9525 in a proven application	Brochure	pdf
75016532	Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9525x and 5-channel I2C-bus hubs PCA9516x	Leaflet	pdf
75016080	Extend the reach of any I2C-bus system without special offset voltage levels; NXP I2C-bus extender PCA9525	Leaflet	pdf
75017424	NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns	Leaflet	pdf
UM10204	I2C-bus specification and user manual	User manual	pdf
UM10206	I2C Demonstration Board 2005-1 Quick Start Guide	User manual	pdf
UM10323	PCA9600 demonstration board OM6293	User manual	pdf