PD557 datasheet(2/36 Pages) TI

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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

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)

SCL

Serial clock bus. Connect to VCC through a pullup resistor.

SDA

Serial data bus. Connect to VCC through a pullup resistor.

Address input. Connect directly to VCC or ground.

P-port input/output. High impedance open-drain design structure. Connect to VCC

through a pullup resistor.

P-port input/output. Push-pull design structure.

GND

Ground

P-port input/output. Push-pull design structure.

Active-low reset input. Connect to VCC through a pullup resistor if no active

RESET

connection is used.

VCC

Supply voltage

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