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PCA9518 Datasheet(PDF) 2 Page - NXP Semiconductors

Part # PCA9518
Description  Expandable 5-channel I2C hub
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9518 Datasheet(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9518
Expandable 5-channel I2C hub
2
2004 Sep 29
DESCRIPTION
The PCA9518 is a BiCMOS integrated circuit intended for
application in I2C and SMBus systems.
While retaining all the operating modes and features of the I2C
system, it permits extension of the I2C-bus by buffering both the
data (SDA) and the clock (SCL) lines, thus enabling virtually
unlimited buses of 400 pF.
The I2C-bus capacitance limit of 400 pF restricts the number of
devices and bus length. Using the PCA9518 enables the system
designer to divide the bus into an unlimited number of segments off
of a hub where any segment to segment transition sees only one
repeater delay and is multiple master capable on each segment.
Using multiple PCA9518 parts, any width hub (in multiples of five)1
can be implemented using the expansion pins.
A PCA9518 cluster cannot be put in series with a PCA9515/16
or with another PCA9518 cluster. Multiple PCA9518 devices can
be grouped with other PCA9518 devices into any size cluster thanks
to the EXPxxxx pins that allow the I2C signals to be sent/received
from/to one PCA9518 to/from another PCA9518 within the cluster.
Since there is no direction pin, slightly different “legal” low voltage
levels are used to avoid lock up conditions between the input and
the output of individual repeaters in the cluster. A “regular low”
applied at the input of any of the PCA9518 devices will then be
propagated as a “buffered low” with a slightly higher value to all
enabled outputs in the PCA9518 cluster. When this “buffered low” is
applied to a PCA9515 and PCA9516 or separate PCA9518 cluster
(not connected via the EXPxxx pins) in series, the second PCA9515
and PCA9516 or PCA9518 cluster will not recognize it as a “regular
low” and will not propagate it as a “buffered low ” again. The
PCA9510/9511/9513/9514 and PCA9512 cannot be used in series
with the PCA9515 and PCA9516 or PCA9518 but can be used in
series with themselves since they use shifting instead of static
offsets to avoid lock up conditions.
FEATURES
Expandable 5 channel, bi-directional buffer
I2C-bus and SMBus compatible
Active-HIGH individual repeater enable inputs
Open-drain input/outputs
Lock-up free operation
Supports arbitration and clock stretching across the repeater
Accommodates standard mode and fast mode I2C devices and
multiple masters
Powered-off high-impedance I2C pins
Operating supply voltage range of 3.0 V to 3.6 V
5 V tolerant I2C and enable pins
0 kHz to 400 kHz clock frequency2
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
exceeds 100 mA.
Package offerings: SO and TSSOP
PIN CONFIGURATION
10
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
EXPSCL1
EXPSCL2
SCL0
SDA0
SCL1
SDA1
EN1
SCL2
SDA2
GND
VCC
EN4
SDA4
SCL4
EN3
SDA3
SCL3
EXPSDA2
EN2
EXPSDA1
SU01595
Figure 1. Pin configuration
PIN DESCRIPTION
PIN
SYMBOL
FUNCTION
1
EXPSCL1
Expandable serial clock pin 1
2
EXPSCL2
Expandable serial clock pin 2
3
SCL0
Serial clock bus 0
4
SDA0
Serial data bus 0
5
SCL1
Serial clock bus 1
6
SDA1
Serial data bus 1
7
EN1
Active-HIGH Bus 1 enable Input
8
SCL2
Serial clock bus 2
9
SDA2
Serial data bus 2
10
GND
Supply ground
11
EN2
Active-HIGH Bus 2 enable Input
12
SCL3
Serial clock bus 3
13
SDA3
Serial data bus 3
14
EN3
Active-HIGH Bus 3 enable Input
15
SCL4
Serial clock bus 4
16
SDA4
Serial data bus 4
17
EN4
Active-HIGH Bus 4 enable Input
18
EXPSDA1
Expandable serial data pin 1
19
EXPSDA2
Expandable serial data pin 2
20
VCC
Supply power
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
TOPSIDE MARK
DRAWING NUMBER
20-pin plastic SO
–40
°C to +85 °C
PCA9518D
PCA9518D
SOT163-1
20-pin plastic TSSOP
–40
°C to +85 °C
PCA9518PW
PCA9518
SOT360-1
Standard packing quantities and other packaging data is available at www.standardproducts.philips.com/packaging.
1.
Only four ports per device are available if individual Enable is required.
2.
The maximum system operating frequency may be less than 400 kHz because of the delays added by the repeater.


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