PCA9502BS,157 Overview
Using 8 I/Os, it is programmed.24-VFQFN Exposed Pad comes with the device enclosed in the packaging.The case comes in the Tray style.Votage is provided within 2.3V~3.6V.The mounting type recommended for it is Surface Mount.Devices work when the operating temperature ranges -40°C~85°C.The performance of the output frequency is determined by 400kHz.
PCA9502BS,157 Features

PCA9502BS,157 Applications
There are a lot of Rochester Electronics, LLC
PCA9502BS,157 I/O Expanders applications.

Single-Ended to Differential Conversion/Amplification
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

Mounting Type	Surface Mount
Package / Case	24-VFQFN Exposed Pad
Supplier Device Package	24-HVQFN (4x4)
Operating Temperature	-40°C~85°C
Packaging	Tray
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Voltage - Supply	2.3V~3.6V
Output Type	Push-Pull
Interface	I2C, SPI
Number of I/O	8
Clock Frequency	400kHz
Interrupt Output	No
RoHS Status	ROHS3 Compliant