1. General description
The PCA9512A/B is a hot swappable I
2
C-bus and SMBus buffer that allows I/O card
insertion into a live backplane without corruption of the data and clock buses and includes
two dedicated supply voltage pins to provide level shifting between 3.3 V and 5 V systems
while maintaining the best noise margin for each voltage level. Either pin may be powered
with supply voltages ranging from 2.7 V to 5.5 V with no constraints on which supply
voltage is higher. Control circuitry prevents the backplane from being connected to the
card until a stop bit or bus idle occurs on the backplane without bus contention on the
card. When the connection is made, the PCA9512A/B provides bidirectional buffering,
keeping the backplane and card capacitances isolated.
Both the PCA9512A and PCA9512B use identical silicon (PCN201012007F dated
13 Dec 2010), so the PCA9512B will be discontinued in the near future and is not
recommended for new designs.
The PCA9512A/B rise time accelerator circuitry allows the use of weaker DC pull-up
currents while still meeting rise time requirements. The PCA9512A/B incorporates a digital
input pin that enables and disables the rise time accelerators on all four SDAn and SCLn
pins.
During insertion, the PCA9512A/B SDAn and SCLn pins are precharged to 1 V to
minimize the current required to charge the parasitic capacitance of the chip.
The incremental offset design of the PCA9510A/11A/12A/12B/13A/14A I/O drivers allows
them to be connected to another PCA9510A/11A/12A/12B/13A/14A device in series or in
parallel and to the I
2
C compliant side of static offset bus buffers, but not to the static offset
side of those bus buffers.
2. Features and benefits
Bidirectional buffer for SDA and SCL lines increases fan-out and prevents SDA and
SCL corruption during live board insertion and removal from multipoint backplane
systems
Compatible with I
2
C-bus Standard mode, I
2
C-bus Fast mode, and SMBus standards
Built-in V/t rise time accelerators on all SDA and SCL lines (0.6 V threshold) with
ability to disable V/t rise time accelerator through the ACC pin for lightly loaded
systems, requires the bus pull-up voltage and respective supply voltage (V
CC
or V
CC2
)
to be the same
5 V to 3.3 V level translation with optimum noise margin
High-impedance SDAn and SCLn pins for V
CC
or V
CC2
=0V
1 V precharge on all SDAn and SCLn pins
Supports clock stretching and multiple master arbitration and synchronization
PCA9512A; PCA9512B
Level shifting hot swappable I
2
C-bus and SMBus bus buffer
Rev. 6 — 1 March 2013 Product data sheet
