PCA9554APW,112 Overview
It features 8 I/Os.16-TSSOP (0.173, 4.40mm Width) comes in a package with the device.The case comes in the form of a Tube.In this case, the vote is supplied within the range of 2.3V~5.5V.It is recommended that you mount it in a Surface Mount-position.As long as the operating temperature ranges -40°C~85°C, the device works.In terms of performance, its output frequency is 400kHz.As a result of the use of this device, POR can also be founded.
PCA9554APW,112 Features

PCA9554APW,112 Applications
There are a lot of Rochester Electronics, LLC
PCA9554APW,112 I/O Expanders applications.

Multiprotocol RFID Readers: EPC-GEN2, ISD and IPX
IDEN, PHS, GSM Basestations
Repeaters, Radio Links, and Modems
Wireless Telemetry
JTRS
802.11x Receivers
IDEN
PHS
TD-SCDMA
CDMA2000

Mounting Type	Surface Mount
Package / Case	16-TSSOP (0.173, 4.40mm Width)
Supplier Device Package	16-TSSOP
Operating Temperature	-40°C~85°C
Packaging	Tube
Feature	POR
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Voltage - Supply	2.3V~5.5V
Output Type	Push-Pull
Interface	I2C, SMBus
Number of I/O	8
Clock Frequency	400kHz
Interrupt Output	Yes
Current - Output Source/Sink	10mA 25mA
RoHS Status	ROHS3 Compliant