XC6121/XC6122
XC6123/XC6124
Series
■GENERAL
DESCRIPTION
ETR0209-011b
Voltage Detector with Watchdog Function and ON/OFF Control (V
DF
=1.6V~5.0V)
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 V
DFL
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 V
IN
pin or
pulled down to the V
SS
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
●Microprocessor
watchdog monitoring
and reset circuits
●Memory
battery backup circuits
●System
power-on reset circuits
●Power
failure detection
■FEATURES
Detect Voltage Range
Hysteresis Width
Operating Voltage Range
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.)
Operating Ambient Temperature
: -40℃~ +85℃
Packages
: SOT-25, USP-6C
Environmentally Friendly
: EU RoHS Compliant, Pb Free
: 1.6V ~ 5.0V, +2%
(0.1V increments)
: V
DFL
x 5% (TYP.)
: 1.0V ~ 6.0V
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Supply
Current vs. Input Voltage
ＸＣ６１２１½ＸＣ６１２４(V
DF
=２.７Ｖ）
14.0
Ta=85℃
(μA)
Supply Current: I
SS
12.0
10.0
8.0
6.0
4.0
2.0
0
0
1
2
3
4
Input Voltage: V
IN
(V)
5
6
Ta=25℃
Ta=-40℃
1/26
XC6121/XC6122/XC6123/XC6124
Series
■PIN
CONFIGURATION
SOT-25
(TOP VIEW)
USP-6C
(BOTTOM VIEW)
* The dissipation pad for the USP-6C package should be
solder-plated in reference mount pattern and metal masking
so as to enhance mounting strength and heat release. If
the pad needs to be connected to other pins, it should be
connected to the V
SS
(No. 5) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
1
2
3
4
5
-
USP-6C
4
5
2
1
6
3
PIN NAME
RESETB
V
SS
EN/ENB
WD
V
IN
NC
FUNCTION
Reset Output
Ground
Watchdog ON/OFF Control
Watchdog
Power Input
No Connection
2/26
XC6121/XC6122/XC6123/XC6124
Series
■PRODUCT
CLASSIFICATION
●Selection
Guide
RESET OUTPUT
SERIES
V
DFL
(RESETB)
(*1)
N-channel open drain
N-channel open drain
N-channel open drain
N-channel open drain
V
DFH
(RESET)
-
-
-
-
HYSTERESIS
EN/ENB PIN FUNCTION
EN/ENB Input
Logic
(*2)
EN
EN
ENB
ENB
Pull-Up or Down
Resistor
With No Pull-Up
Resistor
With Pull-Up
Resistor
With No Pull-Down
Resistor
With Pull-Down
Resistor
XC6121
XC6122
XC6123
XC6124
(*1)
(*2)
Available:
V
DFL
x 5% (TYP.)
The output type of RESETB is set to L level at the time of detection.
EN input logic: The watchdog function turns on when the EN pin becomes high level.
ENB input logic: The watchdog function turns on when the ENB pin becomes low level.
●Ordering
Information
XC6121①②③④⑤⑥-⑦
(
*2
)
: N-channel Open Drain Output (RESETB), EN Pin: No Pull-Up Resistor
XC6122①②③④⑤⑥-⑦
(
*2
)
: N-channel Open Drain Output (RESETB), EN Pin: Pull-Up Resistor
XC6123①②③④⑤⑥-⑦
(
*2
)
: N-channel Open Drain Output (RESETB), ENB Pin: No Pull-Down Resistor
XC6124①②③④⑤⑥-⑦
(
*2
)
: N-channel Open Drain Output (RESETB), ENB Pin: Pull-Down Resistor
DESIGNATOR
ITEM
SYMBOL
A
C
①
Release Delay Time
(*1)
D
E
F
2
3
②
Watchdog Timeout Period
4
5
6
7
③④
Detect Voltage
16 ~ 50
MR
⑤⑥-⑦
(*2)
Packages
(Order Unit)
MR-G
ER
ER-G
(*1)
DESCRIPTION
3.13ms (TYP.)
50ms (TYP.)
100ms (TYP.)
200ms (TYP.)
400ms (TYP.)
50ms (TYP.)
100ms (TYP.)
200ms (TYP.)
400ms (TYP.)
1.6s (TYP.)
800ms (TYP.)
Detect voltage
ex.) 4.5V:
③⇒4, ④⇒5
SOT-25 (3,000/Reel)
SOT-25 (3,000/Reel)
USP-6C (3,000/Reel)
USP-6C (3,000/Reel)
Please set the release delay time shorter than or equal to the watchdog timeout period.
ex.) XC6121D327MR or XC6121D627MR
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
(*2)
3/26
PCB Design
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