XC6121/XC6122
XC6123/XC6124Series
ETR0209-009
Voltage Detector with Watchdog Function and ON/OFF Control (VDF=1.6V~5.0V)
■GENERAL DESCRIPTION
The XC6121/XC6122/XC6123/XC6124 series are groups 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 XC6121/XC6122/XC6123/XC6124 series’ ICs do not require
any external components to output signals with release delay time. The output type is VDFL low when detected. With the
XC6121/XC6122/XC6123/XC6124 series’ ICs, 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, the ICs
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 100mV, using laser trimming technology. Six watchdog timeout period settings are available in a
range from 50ms to 1.6s. Five release delay time settings are available in a range from 3.13ms to 400ms.
■FEATURES
■APPLICATIONS
●Microprocessor watchdog monitoring
and reset circuits
Detect Voltage Range
: 1.6V ~ 5.0V, +2%
(100mV increments)
: VDFL x 5% (TYP.)
Hysteresis Width
Operating Voltage Range : 1.0V ~ 6.0V
●Memory battery backup circuits
●System power-on reset circuits
●Power failure detection
Detect Voltage Temperature
Characteristics
: +100ppm/OC (TYP.)
Output Configuration
Watchdog Pin
: 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.)
: SOT-25, USP-6C
Package
■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)
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