XC6121/XC6122
XC6123/XC6124Series
ETR0209-011b
Voltage Detector with Watchdog Function and ON/OFF Control (VDF=1.6V~5.0V)
■GENERAL DESCRIPTION
The XC6121/XC6122/XC6123/XC6124 series is a group of high-precision, low current consumption voltage detectors with
watchdog functions incorporating CMOS process technology. The series consist of a reference voltage source, delay circuit,
comparator, and output driver. With the built-in delay circuit, the series do not require any external components to output
signals with release delay time. The output type is VDFL low when detected. The EN/ENB pin can control ON and OFF of the
watchdog functions. By setting the EN/ENB pin to low or high level, the watchdog function can be OFF while the voltage
detector remains operation. Since the EN/ENB pin of the XC6122 and XC6124 series is internally pulled up to the VIN pin or
pulled down to the VSS pin, these series can be used with the EN/ENB pin left open when the watchdog functions is used. The
detect voltages are internally fixed 1.6V ~ 5.0V in increments of 0.1V, using laser trimming technology. Six watchdog timeout
periods are available in a range from 50ms to 1.6s. Five release delay times are available in a range from 3.13ms to 400ms.
■APPLICATIONS
■FEATURES
Detect Voltage Range
: 1.6V ~ 5.0V, +2%
(0.1V increments)
: VDFL x 5% (TYP.)
: 1.0V ~ 6.0V
●Microprocessor watchdog monitoring
and reset circuits
Hysteresis Width
Operating Voltage Range
Detect Voltage Temperature
Characteristics
Output Configuration
Watchdog Pin
●Memory battery backup circuits
●System power-on reset circuits
●Power failure detection
: +100ppm/OC (TYP.)
: N-channel open drain
: Watchdog input
If watchdog input maintains ‘H’ or
‘L’ within the watchdog timeout
period, a reset signal is output
from the RESETB pin.
: When the EN/ENB pin voltage is
set to low or high level, the
watchdog function is forced off.
: 400ms, 200ms, 100ms, 50ms,
3.13ms (TYP.)
EN/ENB Pin
Release Delay Time
Watchdog Timeout Period
: 1.6s, 800ms, 400ms, 200ms,
100ms, 50ms (TYP.)
Operating Ambient Temperature
: -40℃~ +85℃
: SOT-25, USP-6C
: EU RoHS Compliant, Pb Free
Packages
Environmentally Friendly
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTERISTICS
●Supply Current vs. Input Voltage
XC6121~XC6124(V =2.7V)
DF
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0
Ta=85℃
Ta=25℃
Ta=-40℃
0
1
2
3
4
5
6
Input Voltage:ꢀVIN (V)
1/26