Specification	PCA9557DBR

Clock Frequency	400 kHz
Current - Output Source/Sink [custom]	10 mA
Current - Output Source/Sink [custom]	25 mA
Features	POR
Interface	I2C, SMBus
Interrupt Output	False
Mounting Type	Surface Mount
Number of I/O	8
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output Type	Open Drain, Push-Pull
Package / Case	16-SSOP
Package / Case [custom]	0.209 in
Package / Case [custom]	5.3 mm
Supplier Device Package	16-SSOP
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	2.3 V

PCA9557 Series

8-bit 2.3- to 5.5-V I2C/SMBus I/O expander with reset & config registers

Part	Interface	Voltage - Supply [Min]	Voltage - Supply [Max]	Output Type	Clock Frequency	Current - Output Source/Sink [custom]	Current - Output Source/Sink [custom]	Mounting Type	Supplier Device Package	Number of I/O	Package / Case [x]	Package / Case	Package / Case [y]	Operating Temperature [Max]	Operating Temperature [Min]	Features	Package / Case [custom]	Package / Case [custom]
Texas Instruments PCA9557PW	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-TSSOP	8	0.173 in	16-TSSOP	4.4 mm	85 °C	-40 °C	POR
Texas Instruments PCA9557D	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-SOIC	8	0.154 in	16-SOIC	3.9 mm	85 °C	-40 °C	POR
Texas Instruments PCA9557PWT	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-TSSOP	8	0.173 in	16-TSSOP	4.4 mm	85 °C	-40 °C	POR
Texas Instruments PCA9557DB	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-SSOP	8		16-SSOP		85 °C	-40 °C	POR	0.209 in	5.3 mm
Texas Instruments PCA9557RGYR	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-VQFN (4x3.5)	8		16-VFQFN Exposed Pad		85 °C	-40 °C	POR
Texas Instruments PCA9557DBR	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-SSOP	8		16-SSOP		85 °C	-40 °C	POR	0.209 in	5.3 mm
Texas Instruments PCA9557DR	I2C SMBus	2.3 V	5.5 V	Open Drain Push-Pull	400 kHz	10 mA	25 mA	Surface Mount	16-SOIC	8	0.154 in	16-SOIC	3.9 mm	85 °C	-40 °C	POR

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 1.73
		10	$ 1.56
		25	$ 1.47
		100	$ 1.25
		250	$ 1.18
		500	$ 1.03
		1000	$ 0.85
	Digi-Reel®	1	$ 1.73
		10	$ 1.56
		25	$ 1.47
		100	$ 1.25
		250	$ 1.18
		500	$ 1.03
		1000	$ 0.85
	Tape & Reel (TR)	2000	$ 0.79
		6000	$ 0.76
		10000	$ 0.73
Texas Instruments	LARGE T&R	1	$ 1.25
		100	$ 1.03
		250	$ 0.74
		1000	$ 0.56

Description

General part information

PCA9557 Series

This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3V to 5.5V VCC operation. The device provides general-purpose remote I/O expansion for most microcontroller families through the I2C interface [serial clock (SCL) and serial data (SDA)].

The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high) registers. At power on, the I/Os are configured as inputs. However, the system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the input port register can be inverted with the polarity inversion register. All registers can be read by the system controller.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.