N84C161 Datasheet, PDF (1/11 Pages) ON Semiconductor – Supervisory Circuits with I2C Serial CMOS EEPROM Precision Reset Controller

N84C161, N84C162
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Supervisory Circuits with
I²C Serial CMOS EEPROM,
Precision Reset Controller
and Watchdog Timer (16K)
www.onsemi.com
Description
The N84C161/2 is a complete memory and supervisory solution for
microcontroller−based systems. A serial EEPROM memory (16K)
with hardware memory write protection, a system power supervisor
with brown out protection and a watchdog timer are integrated
together in low power CMOS technology. Memory interface is via an
I²C bus.
SOIC−8
CASE 751BD
The 1.6−second watchdog circuit returns a system to a known good
state if a software or hardware glitch halts or “hangs” the system. The
N84C161 watchdog monitors the SDA line, making an additional PC
PIN CONFIGURATION
board trace unnecessary. The lower cost N84C162 does not have a
DC 1
8 V_CC
watchdog timer.
The power supply monitor and reset circuit protects memory and
system controllers during power up/down and against brownout
conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V
RESET
WP
GND
2 _N84C161 7
3 ^N84C162 6
4
5
RESET
SCL
SDA
systems. If power supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller, ASIC or
peripherals from operating. Reset signals become inactive typically
PIN FUNCTIONS
200 ms after the supply voltage exceeds the reset threshold level. With
Pin Name Function
both active high and low reset signals, interface to microcontrollers
and other ICs is simple. In addition, a reset pin can be used as a
debounced input for pushbutton manual reset capability.
The N84C161/2 memory features a 16−byte page. In addition,
DC
RESET
WP
Do Not Connect
Active Low Reset I/O
Write Protect
hardware data protection is provided by a write protect pin WP and by
GND
Ground
a V_CC sense circuit that prevents writes to memory whenever V_CC falls
below the reset threshold or until V_CC reaches the reset threshold
during power up.
These devices are available in a green SOIC−8 package.
Features
SDA
SCL
RESET
V_CC
Serial Data/Address
Clock Input
Active High Reset I/O
Power Supply
• Watchdog Monitors SDA Signal (N84C161)
• 400 kHz I²C Bus Compatible
ORDERING INFORMATION
• 2.7 V to 6 V Operation
For Ordering Information details, see page 11.
• Low Power CMOS Technology
• 16−Byte Page Write Buffer
• Built−in Inadvertent Write Protection
♦ V_CC Lock Out
♦ Write Protection Pin, WP
• 1,000,000 Program/Erase Cycles
• Manual Reset
• 100 Year Data Retention
• Active High or Low Reset
• 8−Pin SOIC
♦ Precision Power Supply Voltage Monitor
♦ 5 V, 3.3 V and 3 V Systems
♦ Five Threshold Voltage Options
• Commercial and Industrial Temperature Ranges
• These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2016
1
September, 2016 − Rev. P0
Publication Order Number:
N84C161/D