PCA9521DP 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCA9521DP

Fast dual bidirectional bus buffer

NXP Semiconductors. 

PCA9521

Fast dual bidirectional bus buffer

Rev. 2 — 19 March 2013

Product data sheet

1. General description

The PCA9521 is a monolithic bipolar integrated circuit for bus buffering in applications

including I2C-bus, SMBus, PMBus, and other systems based on similar principles.

The buffer extends the bus load limit by buffering both the SCL and SDA lines. It supports

up to 400 pF loads on each side of the buffer at 400 kHz. Higher capacitance is supported

at lower speeds, and lower capacitance at higher speeds up to 1 MHz.

The enable 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. Systems

employing removable components on a back-plane (for example, telecommunications

racks) can use the enable pin and the high-impedance ports on power-down to safely

install and remove components in active systems.

Bus level translation between a very wide range of bus voltages, from 1.8 V to 10 V, is

supported. This feature provides enormous flexibility in interfacing systems of different

technologies.

The unique operation of the PCA9521 provides one of the fastest response times of such

bidirectional buffers, ensuring any glitches (common to other buffers) are kept well within

the 50 ns I2C-bus specification. Additionally, it does this without the need for ‘rise-time

accelerators’ which, combined with low noise margins, may cause glitches outside of the

I2C-bus specification.

2. Features and benefits

 Dual, bidirectional unity gain buffer

 Fast switching times allow operation in excess of 1 MHz

 Supports I2C-bus (Standard-mode and Fast-mode), SMBus (standard and high power

mode), PMBus and IPMB

 Enable allows bus segments to be disconnected

 Low standby current when not enabled

 Application/removal of power to IC will not interfere with other bus activity

 6 mA (static) pull-down capability supports a wide range of bus standards

 Low noise susceptibility

 Low input-output offset voltage

 Threshold and offset parameters allow the connection of several devices in series

 Bus levels independent of supply voltage

 Operating voltages from 2.7 V to 5.5 V

 Wide range of bus voltages from 1.8 V to 10 V

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