TCA9802 Datasheet, PDF (1/36 Pages) Texas Instruments – Level-Translating I2C Bus Buffer/Repeater

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TCA9802 Level-Translating I²C Bus Buffer/Repeater
TCA9802
SCPS266 – MARCH 2017
1 Features
•1 Two-Channel Bidirectional Buffer
• Integrated Current Source on B-side, Requires No
External B-Side Resistors
• Ultra-Low Power Consumption
• No Static-Voltage Offset, Low V_OL
• I²C Bus and SMBus Compatible
• Operating Supply Voltage Range of 0.8 V to 3.6 V
on A-side
• Operating Supply Voltage Range of 1.65 V to 3.6
V on B-side
• Active-High Repeater Enable Input
• Powered-Off High Impedance I²C Bus Pins on A-
Side
• Powered-Off Back-Power Protection I²C Bus Pins
• Support for Clock Stretching and Multiple Master
Arbitration
• Family of Current Source Options from 0.5 mA to
3 mA
2 Applications
• Servers
• Routers (Routing Equipment)
• Industrial Equipment
• Personal Computers
• Power-Sensitive Applications
3 Description
The TCA9802 is a dual-channel bidirectional buffer
intended for I²C bus and SMBus/PMBus systems. It
provides bidirectional level shifting (up-translation and
down-translation) between low voltages (down to 0.8
V) and higher voltages (1.65 V to 3.6 V). The
TCA9802 features an internal current source on the
B-side of the device, allowing the removal of external
pull-up resistors on the B-side. The current source
also provides an improved rise time and ultra-low
power consumption.
The TCA9802 is able to provide true buffering (rather
than a pass-FET solution) without using a static
voltage offset or incremental offset. This means that
the V_OL on both the A and B sides of the TCA9802
are very low (approximately 0.2 V), helping to
eliminate communication issues as a result of fixed
V_IL thresholds. Another key feature of the TCA9802 is
that there are no power sequencing requirements, or
power supply dependencies. V_CCA can be greater
than, less than, or equal to V_CCB. This gives the
system designer flexibility with how the TCA9802 is
used.
The TCA9802 is part of a four device family with
varying current source strengths (see the Device
Comparison Table).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TCA9802
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Device Comparison
Part Number
I_CS: Current Source
Value
TCA9800
0.5 mA
TCA9801
1 mA
TCA9802
2 mA
TCA9803
3 mA
Simplified Schematic
I²C or SMBus Master
(e.g. Processor)
1
VCCA
3 SDAA
2 SCLA
5 EN
TCA9802
GND
4
8
VCCB
SDAB 6
SCLB 7
I²C Slave Devices
Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.