PCA9515B Datasheet, PDF (1/13 Pages) Texas Instruments – DUAL BIDIRECTIONAL I2C BUS AND SMBus REPEATER

PCA9515B
www.ti.com
SCPS232 – MARCH 2012
DUAL BIDIRECTIONAL I²C BUS AND SMBus REPEATER
Check for Samples: PCA9515B
FEATURES
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• Two-Channel Bidirectional Buffers
• I²C Bus and SMBus Compatible
• Active-High Repeater-Enable Input
• Open-Drain I²C I/O
• 5.5-V Tolerant I²C I/O and Enable Input Support
Mixed-Mode Signal Operation
• Lockup-Free Operation
• Accommodates Standard Mode, Fast Mode I²C
Devices, and Multiple Masters
• Supports Arbitration and Clock Stretching
Across Repeater
• Powered-Off High-Impedance I²C Pins
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class I
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
DGK PACKAGE
(TOP VIEW)
NC 1
SCL0 2
SDA0 3
GND 4
8 ^V_CC
7 SCL1
6 SDA1
5 EN
NC – No internal connection
DESCRIPTION
The PCA9515B is a BiCMOS integrated circuit intended for I²C bus and SMBus systems applications. The
device contains two identical bidirectional open-drain buffer circuits that enables I²C and similar bus systems to
be extended without degrading system performance. The dual bidirectional I²C buffer is operational at 2.3-V to
3.6-V V_CC.
The PCA9515B buffers both the serial data (SDA) and serial clock (SCL) signals on the I²C bus, while retaining
all the operating modes and features of the I²C system. This feature allows two buses, of 400-pF bus
capacitance, to be connected in an I²C application.
The I²C bus capacitance limit of 400 pF restricts the number of interfaced devices and bus length. Using the
PCA9515B, a system designer can isolate two halves of a bus, thus accommodating more I²C devices or longer
trace lengths.
The PCA9515B has an active-high enable (EN) input with an internal pull-up. This allows users to select when
the repeater is active and isolate malfunctioning slaves on power-up reset. States should never be changed
during an I²C operation. Disabling during a bus operation will hang the bus and enabling part way through a bus
cycle may confuse the I²C parts being enabled. The EN input should only change state when the global bus and
the repeater port are in an idle state to prevent system failures.
The PCA9515B can also be used to operate two buses, one at 5-V interface levels and the other at 3.3-V
interface levels. The buses may also function at 400-kHz or 100-kHz operating frequency. If the two buses are
operating at different frequencies, the 100-kHz bus must be isolated if the operation of the 400-kHz bus is
required. If the master is running at 400-kHz, the maximum system operating frequency may be less than
400 kHz due to the delays added by the repeater.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated