CPC5903 Datasheet, PDF (1/15 Pages) IXYS Corporation – Bidirectionally Buffers I2C SDA Signal

INTEGRATED CIRCUITS DIVISION
CPC5903
Optically Isolated I²C Bus Repeater
Features
• Bidirectionally Buffers I²C SDA Signal
• Extends and Isolates I²C Interfaces
• Standard-mode and Fast-mode I²C
Side B Fast-mode Compatible V_DDB > 4.5V
• Operates on 2.7V to 5.5V
• Voltage Level Translation
• Slew-Limited Drivers Reduce EMI
• Powerdown to Hi-Z Does Not Load I²C
• 3750V_rms Galvanic Isolation
• Single 8-pin Surface-Mount Package
Applications
• Isolated Control and Signal Monitoring
• Power-over-Ethernet
• Power Supply High Side Interface
• I²C Bus Length Extenders
• I²C Logic Level Translation
Approvals
• UL 1577 Certified Component: File E76270
• EN/IEC 60950 Certified Component:
TUV Certificate: B 11 10 49410 007
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Description
The CPC5903 is a dual, optically isolated, logic-bus
repeater. It isolates two open-drain logic signals while
providing 3750V_rms of galvanic isolation. When the
two sides are powered by different supply voltages, it
also functions as a logic level translator for levels as
low as 2.7V or as high as 5.5V. Because the CPC5903
provides an isolated bidirectional buffer for the I²C
data signal and a unidirectional buffer for the I²C clock
signal, it is best suited for applications where clock
stretching is not required. This configuration also
requires the I²C bus master to be on the Side A bus.
Unlike transformer or capacitive isolators, optical
isolation passes DC signals and does not require
continuous clocking to ensure the proper state is
maintained. The CPC5903 always returns the buffered
signals to their proper state after transient
interruptions on either side.
Ordering Information
Part
CPC5903G
CPC5903GS
CPC5903GSTR
Description
8-Pin DIP (50 / Tube)
8-Pin Surface Mount (50 / Tube)
8-Pin Surface Mount (1000 / Reel)
Figure 1. CPC5903 Functional Block Diagram
V_DDA
IA
1
V_DDA
LED
B
GND_A 2
A
V_DDA
IOA
3
V_DDA
V
4
DDA
A
A
V_DDA
LED
V_DDB
LED
V_DDB
DQ
CLR
B
V_DDB
8
V_DDB
B
V_DDB
7 _OB
6
B
GND_B
V_DDB
5 _IOB
DS-CPC5903-R02
www.ixysic.com
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