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PCA9557DBRG4 Datasheet(PDF) 2 Page - Texas Instruments

Part # PCA9557DBRG4
Description  REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCA9557DBRG4 Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
PCA9557
SCPS133I – DECEMBER 2005 – REVISED JUNE 2008.................................................................................................................................................... www.ti.com
The system master can reset the PCA9557 in the event of a timeout or other improper operation by asserting a
low in the active-low reset (RESET) input. The power-on reset puts the registers in their default state and
initializes the I2C/SMBus state machine. Asserting RESET causes the same reset/initialization to occur without
depowering the part.
Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address, allowing up to eight
devices to share the same I2C bus or SMBus.
ORDERING INFORMATION
TA
PACKAGE(1)(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
QFN – RGV
Reel of 2000
PCA9557RGVR
PD557
QFN – RGY
Reel of 1000
PCA9557RGYR
PD557
Reel of 2500
PCA9557DR
SOIC – D
Reel of 250
PCA9557DT
PCA9557
Tube of 40
PCA9557D
–40°C to 85°C
Reel of 2000
PCA9557DBR
SSOP – DB
PD557
Tube of 80
PCA9557DB
Reel of 2000
PCA9557PWR
TSSOP – PW
Reel of 250
PCA9557PWT
PD557
Tube of 90
PCA9557PW
TVSOP – DGV
Reel of 2000
PCA9557DGVR
PD557
(1)
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
TERMINAL FUNCTIONS
NO.
QFN (RGY)
SOIC (D),
NAME
DESCRIPTION
SSOP (DB),
QFN (RGV)
TSSOP (PW),
AND
TVSOP (DGV)
1
15
SCL
Serial clock bus. Connect to VCC through a pullup resistor.
2
16
SDA
Serial data bus. Connect to VCC through a pullup resistor.
3
1
A0
Address input. Connect directly to VCC or ground.
4
2
A1
Address input. Connect directly to VCC or ground.
5
3
A2
Address input. Connect directly to VCC or ground.
P-port input/output. High impedance open-drain design structure. Connect to VCC
6
4
P0
through a pullup resistor.
7
5
P1
P-port input/output. Push-pull design structure.
8
6
GND
Ground
9
7
P2
P-port input/output. Push-pull design structure.
10
8
P3
P-port input/output. Push-pull design structure.
11
9
P4
P-port input/output. Push-pull design structure.
12
10
P5
P-port input/output. Push-pull design structure.
13
11
P6
P-port input/output. Push-pull design structure.
14
12
P7
P-port input/output. Push-pull design structure.
Active-low reset input. Connect to VCC through a pullup resistor if no active
15
13
RESET
connection is used.
16
14
VCC
Supply voltage
2
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Copyright © 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): PCA9557


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