1/23
X
6121
X
6122
XC6123/XC6124
Series
Voltage Detector with Watchdog Function and ON/OFF Control (V
DF
=1.6V~5.0V)
0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
0123456
Input Voltage: V
IN
(V)
Supply Current: I
SS
(μA)
XC6121~XC6124(V
DF
=2.7V)
Ta=85℃
Ta=-40℃
Ta=25℃
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 V
DFL 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 V
IN pin or pulled down to the V
SS
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
Detect Voltage Range : 1.6V ~ 5.0V, +2%
(100mV increments)
Hysteresis Width : VDFL x 5% (TYP.)
Operating Voltage Range : 1.0V ~ 6.0V
Detect Voltage Temperature
Characteristics
: +
100ppm/
O
C (TYP.)
Output Configuration : N-channel open drain
Watchdog Pin : Watchdog input
If watchdog input maintains ‘H’
or ‘L’ within the watchdog
timeout period, a reset signal is
output from the RESETB pin.
EN/ENB Pin : When the EN/ENB pin voltage is
set to low or high level, the
watchdog function is forced off.
Release Delay Time : 400ms, 200ms, 100ms, 50ms,
3.13ms (TYP.)
Watchdog Timeout Period : 1.6s, 800ms, 400ms, 200ms,
100ms, 50ms (TYP.)
Package : SOT-25, USP-6C
PPLICATIONS
Microprocessor watchdog monitoring
and reset circuits
Memory battery backup circuits
System power-on reset circuits
Power failure detection
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
Supply Current vs. Input Voltage
ETR0209-009