Philips Semiconductors
Product data sheet
Hot swappable I
2
C and SMBus bus buffer
PCA9510; PCA9511
DESCRIPTION
The PCA9510 and PCA9511 are hot swappable I
2
C and SMBus
buffers that allows I/O card insertion into a live backplane without
corrupting the data and clock buses. Control circuitry prevents the
backplane from being connected to the card until a stop command
or bus idle occurs on the backplane without bus contention on the
card. When the connection is made, the PCA9510 and PCA9511
provides bi-directional buffering, keeping the backplane and card
capacitances isolated.
The PCA9511 rise time accelerator circuitry allows the use of
weaker DC pull-up currents while still meeting rise time
requirements, while the PCA9510 has no rise time accelerator
circuitry to prevent interference when there are multiple devices in
the same system. The PCA9510 and PCA9511 incorporate a digital
ENABLE input pin, which enables the device when asserted HIGH
and forces the device into a low current mode when asserted LOW,
and an open-drain READY output pin, which indicates that the
backplane and card sides are connected together (HIGH) or not
(LOW).
During insertion, the PCA9510 (IN only) and PCA9511 SDA and
SCL lines are precharged to 1 V to minimize the current required to
charge the parasitic capacitance of the chip.
The dynamic offset design of the PCA9510/11/12/13/14 I/O drivers
allow them to be connected to another PCA9510/11/12/13/14 device
in series or in parallel and to the A side of the PCA9517. The
PCA9510/11/12/13/14 can
not
connect to the static offset I/Os used
on the PCA9515/15A/16/16A/17 B side and PCA9518.
FEATURES
•
Bi-directional buffer for SDA and SCL lines increases fanout and
prevents SDA and SCL corruption during live board insertion and
removal from multi-point backplane systems
•
Compatible with I
2
C standard mode, I
2
C fast mode, and SMBus
standards
•
∆V/∆t
rise time accelerators on all SDA and SCL lines (PCA9511
only)
•
Rise time accelerator threshold of 0.6 V
•
Active high ENABLE input
•
Active high READY open-drain output
•
High impedance SDA and SCL pins for V
CC
= 0 V
•
1 V precharge on all SDA and SCL lines (PCA9510 IN only)
•
Supports clock stretching and multiple master
arbitration/synchronization
APPLICATION
•
cPCI, VME, AdvancedTCA cards and other multi-point backplane
cards that are required to be inserted or removed from an
operating system.
•
Operating power supply voltage range: 2.7 V to 5.5 V
•
5.5 V tolerant I/Os
•
0 to 400 kHz clock frequency
•
ESD protection exceeds 2000 V HBM per JESD22-A114,
200 V MM per JESD22-A115, and 1000 V CDM per
JESD22-C101
•
Latch-up testing is done to JEDEC Standard JESD78 which
•
Package offer: SO8, TSSOP8 (MSOP8)
ORDERING INFORMATION
PACKAGES
8-pin plastic SO
8-pin plastic SO
8-pin plastic TSSOP (MSOP)
8-pin plastic TSSOP (MSOP)
TEMPERATURE RANGE
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
ORDER CODE
PCA9510D
PCA9511D
PCA9510DP
PCA9511DP
TOPSIDE MARK
PCA9510
PCA9511
9510
9511
DRAWING NUMBER
SOT96-1
SOT96-1
SOT505-1
SOT505-1
exceeds 100 mA
Standard packing quantities and other packaging data is available at www.standardproducts.philips.com/packaging.
2004 Oct 05
2
Philips Semiconductors
Product data sheet
Hot swappable I
2
C and SMBus bus buffer
PCA9510; PCA9511
PIN CONFIGURATION
TOP VIEW
ENABLE 1
SCLOUT
SCLIN
GND
2
3
4
8
7
6
5
V
CC
SDAOUT
SDAIN
READY
PIN DESCRIPTION
PIN
1
SYMBOL
ENABLE
DESCRIPTION
Chip enable pin. Grounding this pin puts the
part in a low current (<1
µA)
mode. It also
disables the rise time accelerators, isolates
SDAIN from SDAOUT and isolates SCLIN
from SCLOUT.
Serial clock output to and from the SCL bus
on the card.
Serial clock input to and from the SCL bus
on the backplane.
Ground. Connect this pin to a ground plane
for best results.
This is an open-drain output which pulls
LOW when SDAIN and SCLIN are
disconnected from SDAOUT and SCLOUT,
and turns off when the two sides are
connected.
Serial data input to and from the SDA bus on
the backplane.
Serial data output to and from the SDA bus
on the card.
Power supply.
2
3
SCLOUT
SCLIN
GND
READY
SW01045
Figure 1. Pin configuration.
4
5
6
7
8
SDAIN
SDAOUT
V
CC
FEATURE SELECTION CHART
FEATURES
Idle detect
High impedance SDA, SCL pins for V
CC
= 0 V
Rise time accelerator circuitry on all SDA and SCL lines
Rise time accelerator circuitry hardware disable pin for lightly loaded
systems
Rise time accelerator threshold 0.8 V vs 0.6 V improves noise margin
Ready open drain output
Two V
CC
pins to support 5 V to 3.3 V level translation with improved noise
margins
1 V precharge on all SDA and SCL lines
92
µA
current source on SCLIN and SDAIN for PICMG applications
PCA9510
Yes
Yes
—
—
—
Yes
—
IN only
—
PCA9511
Yes
Yes
Yes
—
—
Yes
—
Yes
—
PCA9512
Yes
Yes
Yes
Yes
—
—
Yes
Yes
—
PCA9513
Yes
Yes
Yes
—
Yes
Yes
—
—
Yes
PCA9514
Yes
Yes
Yes
—
Yes
Yes
—
—
—
2004 Oct 05
3
PCB Design
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