PCA9539D,112 Overview
16 I/Os are used in its programming.A 24-SOIC (0.295, 7.50mm Width) is enclosed in the package with the device.In addition, it is available in a Tube case as well.The vote is delivered within 2.3V~5.5V.Mounting type Surface Mount is recommended.In operation, the device works when the temperature ranges between -40°C~85°C and X.As for the performance, it works with a frequency of 400kHz.It is also possible to find POR with the use of this device.
PCA9539D,112 Features

PCA9539D,112 Applications
There are a lot of Rochester Electronics, LLC
PCA9539D,112 I/O Expanders applications.

Low Voltage, Low Noise, Differential Signal Processing
Common Mode Voltage Translation
Portable Instrumentation
Multiprotocol RFID Readers: EPC-GEN2, ISD and IPX
IDEN, PHS, GSM Basestations
Repeaters, Radio Links, and Modems
Wireless Telemetry
JTRS
802.11x Receivers
IDEN

Mounting Type	Surface Mount
Package / Case	24-SOIC (0.295, 7.50mm Width)
Supplier Device Package	24-SO
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	16
Clock Frequency	400kHz
Interrupt Output	Yes
Current - Output Source/Sink	10mA 25mA
RoHS Status	ROHS3 Compliant