Datasheet XC6121, XC612, XC6123, XC6124 Datasheet (TOREX)

C

C

X

6121/X

6122

XC6123/XC6124

Series

ETR0209-011

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 V
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
pulled down to the V
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

■TYPICAL APPLICATION CIRCUIT

pin, these series can be used with the EN/ENB pin left open when the watchdog functions is used. The

SS

DFL low when detected. The EN/ENB pin can control ON and OFF of the

IN pin or

■FEATURES

Detect Voltage Range : 1.6V ~ 5.0V, +2%
Hysteresis Width : VDFL x 5% (TYP.)

Operating Voltage Range : 1.0V ~ 6.0V
Detect Voltage Temperature
Characteristics
Output Configuration : N-channel open drain
Watchdog Pin : Watchdog input

EN/ENB Pin : When the EN/ENB pin voltage is

Release Delay Time : 400ms, 200ms, 100ms, 50ms,
Watchdog Timeout Period : 1.6s, 800ms, 400ms, 200ms,
Operating Ambient Tempera ture

Packages
Environmentally Friendly

(0.1V increments)

: +

100ppm/OC (TYP.)

If watchdog input maintains ‘H’ or
‘L’ within the watchdog timeout
period, a reset signal is output
from the RESETB pin.

set to low or high level, the
watchdog function is forced off.

3.13ms (TYP.)

100ms, 50ms (TYP.)

:

-40℃~ +85℃

: SOT-25, USP-6C
: EU RoHS Compliant, Pb Free

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Supply Current vs. Input Voltage

ＸＣ６１２１～ＸＣ６１２４(VDF=２.７Ｖ）

14.0

12.0

10.0

(μA)

SS

8.0

6.0

4.0

Supply Current:　I

2.0

Ta=25℃

0

0123456

Ta=85℃

Input V oltage:　V

Ta=-40℃

(V)

IN

1/26

XC6121/XC6122/XC6123/XC6124

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER

SOT-25 USP-6C

1 4

2 5

3 2 EN/ENB Watchdog ON/OFF Control

4 1 WD Watchdog

5 6 VIN Power Input

- 3 NC No Connection

2/26

SOT-25

(TOP VIEW)

PIN NAME FUNCTION

RESETB Reset Output

V

Ground

SS

Series

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.

XC6121/XC6122/XC6123/XC6124

■PRODUCT CLASSIFICATION

●Selection Guide

RESET OUTPUT EN/ENB PIN FUNCTION

SERIES

VDFL (RESETB)

(*1)

VDFH (RESET)

XC6121 N-channel open drain - EN

XC6122 N-channel open drain - EN

XC6123 N-channel open drain - ENB

XC6124 N-channel open drain -

(*1)

The output type of RESETB is set to L level at the time of detection.

(*2)

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
XC6122①②③④⑤⑥-⑦
XC6123①②③④⑤⑥-⑦
XC6124①②③④⑤⑥-⑦

(*2)

: N-channel Open Drain Output (RESETB), EN Pin: No Pull-Up Resistor

(*2)

: N-channel Open Drain Output (RESETB), EN Pin: Pull-Up Resistor

(*2)

: N-channel Open Drain Output (RESETB), ENB Pin: No Pull-Down Resistor

(*2)

: N-channel Open Drain Output (RESETB), ENB Pin: Pull-Down Resistor

DESIGNATOR ITEM SYMBOL DESCRIPTION

① Release Delay Time

(*1)

② Watchdog Timeout Period

③④ Detect Voltage 16 ~ 50

⑤⑥-⑦

(*1)

Please set the release delay time shorter than or equal to the watchdog timeout period.

ex.) XC6121D327MR or XC6121D627MR

(*2)

The “-G” suffix denotes Halogen and Antimony free as well as being fully RoHS compliant.

(*2)

Packages

(Order Unit)

HYSTERESIS

EN/ENB Input

Logic

Available:

x 5% (TYP.)

V

DFL

ENB

A 3.13ms (TYP.)

C 50ms (TYP.)

D 100ms (TYP.)

E 200ms (TYP.)

F 400ms (TYP.)

2 50ms (TYP.)

3 100ms (TYP.)

4 200ms (TYP.)

5 400ms (TYP.)

6 1.6s (TYP.)

7 800ms (TYP.)

Detect voltage
ex.) 4.5V: ③⇒4, ④⇒5

MR SOT-25 (3,000/Reel)

MR-G SOT-25 (3,000/Reel)

ER USP-6C (3,000/Reel)

ER-G USP-6C (3,000/Reel)

(*2)

Series

Pull-Up or Down

Resistor

With No Pull-Up

Resistor

With Pull-Up

Resistor

With No Pull-Down

Resistor

With Pull-Down

Resistor

3/26

XC6121/XC6122/XC6123/XC6124

■BLOCK DIAGRAMS

●XC6121 Series

●XC6122 Series

4/26

Series

N-ch Open Drain Output

N-ch Open Drain Output

■BLOCK DIAGRAMS (Continued)

●XC6123 Series

●XC6124 Series

XC6121/XC6122/XC6123/XC6124

Series

N-ch Open Drain Output

N-ch Open Drain Output

5/26

XC6121/XC6122/XC6123/XC6124

■ABSOLUTE MAXIMUM RATINGS

PAR AMET ER SYMBOL RATINGS UNITS

VIN VSS -0.3 ~ 7.0 V

Power Dissipation

6/26

Input Voltage

Output Current I

Output Voltage V

SOT-25 250

USP-6C

Operating Ambient Temperature Topr -40 ~ +85

Storage Temperature Tstg -55 ~ +125

VEN/V

V

RBOUT

RESETB

Pd

WD

Series

Ta =2 5OC

V

ENB

SS-0.3～VIN+0.3≦7.0

V

VSS -0.3 ~ 7.0 V

20 mA

SS -0.3 ~ 7.0

V

120

V

mW

O

C

O

C

XC6121/XC6122/XC6123/XC6124

■ELECTRICAL CHARACTERISTICS

PAR AMET ER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

DFL(T)

Detect Voltage VDFL

V

EN

=VSS

Hysteresis Width VHYS VEN=VSS

Supply Current

(*1)

ISS WD=OPEN

VIN=V

VIN=V

×0.9V - 5 11

DFL(T)

×1.1V - 10 16

DFL(T)

=6.0V - 12 18

V

IN

V

× 0.98

VDFL

× 0.02

VDFL(T)

VDFL

× 0.05

Operating Voltage VIN 1.0 - 6.0 V ①

VIN=1.0V 0.15 0.5 -

Output Current IRBOUT

Temperature

Characteristics

△VDFL /

△Topr・VDFL

N-ch.
VDS=0.5V

-40OC < Topr < 85

VIN=2.0V (VDFL(T)> 2.0V) 2.0 2.5 -

VIN=3.0V (VDFL(T) >3.0V) 3.0 3.5 -

V

IN=4.0V (VDFL(T) >4.0V) 3.5 4.0 -

O

C - +100 - ppm/

2.00 3.13 5.00

Release Delay Time

(VDFL<1.8V)

tDR

Time until VIN is increased from

1.0V to 2.0V
and attains to the release time level,
and the Reset output pin releases.

37 50 63

75 100 125
150 200 250
300 400 500

2.00 3.13 5.00

Release Delay Time

(VDFL>1.9V)

tDR

Time until VIN is increased from

1.0V to (VDFL x 1.1V)
and attains to the release time level,
and the Reset output pin releases.

37 50 63

75 100 125
150 200 250
300 400 500

Time until VIN is decreased from 6.0V to

Detect Delay Time tDF

1.0V and attains to the detect voltage
level, and the Reset output pin detects

- 5.5 33 μs ④

while the WD pin left open.

VDFL

Leakage Current

LEAK VIN=6.0V, V

I

=6.0V - 0.01 0.1 μA ③

RESETB

37 50 63

Watchdog

Timeout Period

(V

DFL<1.8V)

t

WD

Time until V

1.0V to 2.0V and
the Reset output pin is released to go

IN increases form

into the detection state. (WD=OPEN)

75 100 125
150 200 250
300 400 500
600 800 1000

1200 1600 2000

37 50 63

Watchdog

Timeout Period

(V

DFL>1.9V)

t

WD

Time until V

1.0V to (V
and the Reset output pin is released to

IN increases from

DFLx1.1V)

go into the detection state. (WD=OPEN)

75 100 125
150 200 250
300 400 500
600 800 1000

1200 1600 2000

VDFL(T)

× 1.02

VDFL

× 0.08

μA ②

mA ③

ms ④

ms ④

ms ⑤

ms ⑤

Series

Ta =2 5OC

V ①

V ①

O

C ①

7/26

XC6121/XC6122/XC6123/XC6124

■ELECTRICAL CHARACTERISTICS (Continued)

Series

PAR AMET ER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

V

Watchdog

Minimum Pulse Width

Watchdog

High Level Voltage

Watchdog

Low Level Voltage

Watchdog

Pull-down Resistance

EN/ENB

High Level Voltage

EN/ENB

Low Level Voltage

EN Pull-up

Resistance

ENB Pull-down

Resistance

NOTE:
* In case where no EN/ENB pin’s condition written in the test condition field, V
** V

DFL(T)

(*1)

The condition when the watchdog pin is ON.

The EN/ENB pin is CMOS input. For the XC6122 (pull-up resistor) and XC6124 (pull-down resistor),

supply current increases in the following values when the watchdog function is OFF.

XC6122 Series：（V
XC6124 Series：V

(*2)

For the XC6122 series only.

(*3)

For the XC6124 series only.

(*2)

(*3)

=Setting detect voltage value

t

WDIN

V

WDH VIN=VDFL x 1.1V ~ 6.0V VIN x 0.7 - 6 V ⑥

VWDL VIN=VDFL x 1.1V ~ 6.0V 0 - VIN x 0.3 V ⑥

RWD

V

ENH/VENBH VIN=VDFL x 1.1V ~ 6.0V 1.3 - VIN V ⑧

V

ENL/VENBL VIN=VDFL x 1.1V ~ 6.0V 0 - 0.35 V ⑧

EN VIN=6.0V, V

R

ENB VIN=6.0V, V

R

IN-VEHL）/1.6MΩ（TYP.）

EHBH/1.6MΩ（TYP.）

IN=6.0V,

Apply pulse from 6.0V to 0V to the WD
pin.

VWD=6V, RWD=VWD/IWD

=0V, REN=VIN / IEN

EN

=6V, RENB=VENB / IENB

ENB

EN=VIN

300 - - ns ⑥

300

600 900 kΩ ⑦

1.0 1.6 2.4 MΩ ⑨

and V

ENB=VSS

.

Ta =2 5OC

8/26

XC6121/XC6122/XC6123/XC6124

Series

■OPERATIONAL EXPLANATION

The XC6121/6122/6123/6124 series compare, using the error amplifier, the voltage of the internal voltage reference source
with the voltage divided by R1, R2 and R3 connected to the V
activates the watchdog logic, delay circuit and the output driver. When the VIN pin voltage gradually falls and finally reaches
the detect voltage, the RESETB pin output goes from high to low in the case of the VDFL type ICs.

<RESETB / RESET Pin Output Signal>

DFL (RESETB) type - output signal: Low when detected.

* V
The RESETB pin output goes from high to low whenever the V
remains low for the release delay time (tDR) after the VIN pin voltage reaches the release voltage. If neither rising nor falling
signals are applied to the WD pin within the watchdog timeout period, the RESETB pin output remains low for the release
delay time (t

<Hysteresis>
When the internal comparator output is high, the NMOS transistor connected in parallel to R3 is turned ON, activating the
hysteresis circuit. The difference between the release and detect voltages represents the hysteresis width, as shown by the
following calculations:

V
VDR (release voltage) = (R1+R2) x Vref / (R2)
VHYS (hysteresis width) =VDR-VDFL (V)
V

* Please refer to the block diagrams for R1, R2, R3 and Vref.

<Watchdog (WD) Pin>
The series use a watchdog timer to detect malfunction or “runaway” of the microprocessor. If neither rising nor falling signals
are applied from the microprocessor within the watchdog timeout period, the RESETB pin output maintains the detection state
for the release delay time (t
to the VSS internally. When the watchdog pin is not connected, A reset signal comes out after the watchdog timeout period.
Six watchdog timeout period settings (t

<EN Pin>
In case where the watchdog function is not used, When the EN pin input driven to low level, only the watchdog function is
forced off while the detect voltage circuit remains operation. For using the watchdog function, the EN pin should be used in
high level. Even after the input voltage and the EN pin voltage are driven back high, the RESETB pin output maintains the
detection state for the release delay time (T
immediately when the input voltage becomes higher than the release voltage and the EN pin voltage driven from low to high
level. (Refer to the TIMING CHART 1-②.) A diode, which is an input protection element, is connected between the EN pin
and V
avoiding any damage to the IC, please use this IC within the stated maximum ratings (VSS -0.3 ~ VIN +0.3) on the EN pin.

<ENB Pin>
In case where the watchdog function is not used, when the ENB pin input driven to high level, only the watchdog function is
forced off while the detect voltage circuit remains operation. For using the watchdog function, the ENB pin should be used in
low level. Even after the input voltage and the ENB pin voltage are driven back low, the RESETB pin output maintains the
detection state for the release delay time (t
immediately when the input voltage becomes higher than the release voltage and the ENB pin voltage driven from high to low
level. (Refer to the TIMING CHART 2-②.) A diode, which is an input protection element, is connected between the ENB pin
and V
avoiding any damage to the IC, please use this IC within the stated maximum ratings (VSS -0.3 ~ VIN +0.3) on the ENB pin.

<Release Delay Time>
Release delay time (tDR) is the time that elapses from when the VIN pin reaches the release voltage, or when the watchdog
timeout period expires with no rising signal applied to the WD pin, until the RESETB pin output is released from the detection
state. Five release delay time (t

3.13ms.

<Detect Delay Time>
Detect Delay Time (t
output goes into the detection state.

DR), and thereafter the RESET pin outputs high level signal.

DFL (detect voltage) = (R1+R2+R3) x Vref / (R2+R3)

DR > VDFL

* Hysteresis width is selectable from VDFL x 0.05V (TYP.).

DR), and thereafter the RESETB pin outputs low to high signal. The watchdog pin is pulled down

WD) are available in 1.6s, 800ms, 400ms, 200ms, 100ms, and 50ms.

DR). (Refer to the TIMING CHART 1-①.) The watchdog function recovers

IN pin. Therefore, if the EN pin is applied voltage that exceeds VIN, the current will flow to VIN through the diode. For

DR). (Refer to the TIMING CHART 2-①.) The watchdog function recovers

IN pin. Therefore, if the ENB pin is applied voltage that exceeds VIN, the current will flow to VIN through the diode. For

DR) watchdog timeout period settings are available in 400ms, 200ms, 100ms, 50ms, and

DF) is the time that elapses from when the VIN pin voltage falls to the detect voltage until the RESETB pin

IN pin. The resulting output signal from the error amplifier

IN pin voltage falls below the detect voltage. The RESETB pin

9/26

XC6121/XC6122/XC6123/XC6124

■TIMING CHARTS

1. XC6121/XC6122 Series (EN products)

●N-ch Open Drain Output (Rpull=100kΩ)

●tDF (N-ch Open Drain Output, Rpull=100kΩ)

10/26

Series

Hysteresis Width

■TIMING CHARTS (Continued)

2. XC6123/XC6124 Series (ENB products)

●N-ch Open Drain Output (Rpull=100kΩ)

●tDF (N-ch Open Drain Output, Rpull=100kΩ)

XC6121/XC6122/XC6123/XC6124

Series

Hysteresis Width

11/26

XC6121/XC6122/XC6123/XC6124

■NOTES ON USE

1. Please use this IC within the stated maximum ratings. For temporary, transitional voltage drop or voltage rising
phenomenon, the IC is liable to malfunction should the ratings be exceeded.

2. When a resistor is connected between the V
malfunction may occur as a result of the IC’s through current.

3. In order to stabilize the IC’s operations, please ensure that the V
1 μ s/V.

4. Noise at the power supply may cause a malfunction of the watchdog operation or the voltage detector. In such case,
please strength V
and evaluate the device on the actual board carefully before use.

5. Protecting against a malfunction while the watchdog time out period, an ignoring time (no reaction time) occurs to the rise
and fall times. Referring to the figure below, the ignoring time (no reaction time) lasts for 900μs at maximum. (refer to the
Figure1 below)

6. The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the V
in high level. The EN pin of the XC6122 series is internally pulled up. The watchdog function can be used even the EN
pin left open. The ENB pin of the XC6123 series is not internally pulled down. When using the watchdog function,
please drive the V
can be used even the ENB pin left open.

7.

Torex places an importance on improving our products and its reliability.

However, by any possibility, we would request user fail-safe design and post-aging treatment on system or equipment.

IN and GND lines. Also, please connect a capacitor such as 0.22μF between the VIN pin and the GND pin

pin in low level. The ENB pin of the XC6124 series is internally pulled up. The watchdog function

ENB

IN pin and the input, the VIN voltage drops while the IC is operating and a

Series

[Figure1]

IN pin’s input frequency’s rise and fall times are more than

12/26

EN

pin

XC6121/XC6122/XC6123/XC6124

■PIN LOGIC CONDITIONS

PIN NAME LOGIC CONDITIONS PIN NAME LOGIC CONDITIONS

H VIN>V

DFL+VHYS

H

VIN

L V

EN/ENB

NOTE:
V

: Detect Voltage

DFL

V

: Hysteresis Range

HYS

V

: WD High Level Voltage

WDH

V

: WD Low Level Voltage

WDL

t

: WD Pulse Width

WDIN

t

: WD Timeout Period

WD

For the details of each parameter, please see the electrical characteristics.

H

L

V

EN/VENB

V

EN/VENB

L

IN<VDFL

≧1.30V L→H V
≦0.35V

WD

H→L V

■FUNCTION CHART

VIN

XC6121/XC6122 XC6123/XC6124

VEN V

ENB

VWD V

H

H H L

OPEN

L

Repeating detect and release (H→L→H)

L⇔H

H H H
L

NOTE:
*1: Including all logics of the WD (V
*2: When the V

When the V

*3: V

=L and VEN/V

IN

*4: The RESETB pin becomes indefinite operation while 0.35V<V
*5: The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the V

level. The EN pin of the XC6122 series is internally pulled up. The watchdog function can be used even the EN pin left open.
The ENB pin of the XC6123 series is not internally pulled down. When using the watchdog function, please drive the V
low level. The ENB pin of the XC6124 series is internally pulled up. The watchdog function can be used even the ENB pin left
open.

RESETB

RESETB

L

=H, L, OPEN, H→L, L→H).

is High, the circuit is in the release state.
is Low, the circuit is in the detection state.

=H can not be combined because the rated input voltage of the EN/ENB pin is Vss-0.3V to VIN+0.3V.

ENB

WD

L

*1

EN/VENB

<1.3V.

The state maintaining WD>

for more than t

The state maintaining WD<V

for more than t

WDL→VWDH

WDH→VWDL

RESETB

, 300ns≦t
, 300ns≦t

(*2)

H

L

WD

WD

WDIN≦tWD

WDIN≦tWD

pin in high

EN

pin in

ENB

Series

V

WDH

WDL

13/26

XC6121/XC6122/XC6123/XC6124

■TEST CIRCUITS

Circuit ①

Circuit ②

Circuit ③

14/26

Series

VDS=0.5V
V

=6.0V when measuring

DS

Leakage current

■TEST CIRCUITS (Continued)

Circuit ④

Circuit ⑤

Circuit ⑥

XC6121/XC6122/XC6123/XC6124

Series

15/26

XC6121/XC6122/XC6123/XC6124

■TEST CIRCUITS (Continued)

Circuit ⑦

Circuit ⑧

Circuit ⑨

16/26

V

REN=VIN/I

I

EN

A

I

ENB

R

ENB=VENB/IENB

EN

V

IN

EN/ENB

VIN

EN/ENB

V

SS

V

SS

RESETB

WD

RESETB

WD

100ｋΩ

100ｋΩ

Series

Measurement waveform

Note: The above reference is about the EN/ENB logic operation.

Note:
XC6122 series has EN pin,
XC6124 Series has ENB pin.

XC6121/XC6122/XC6123/XC6124

■TYPICAL PERFORMANCE CHARACTERISTICS

（1.）Supply Current vs. Input Voltage

14.0

12.0

10.0

(μA)

SS

8.0

6.0

4.0

Supply Current:　I

2.0

14.0

12.0

10.0

(μA)

SS

8.0

6.0

4.0

Supply Current:　I

2.0

（2.）Detect, Release Voltage vs. Ambient Temperature

1.70

(V)

DR

,V

DF

1.65

1.60

Detect, Release Voltage: V

1.55

XＣ６１２１～ＸＣ６１２４(VDF=１.６Ｖ）

Ta=85℃

Ta=25℃

Ta=-40℃

0

0123456

Input Voltage:　V

IN

(V)

ＸＣ６１２１～ＸＣ６１２４(VDF=５.０Ｖ）

Ta=85℃

Ta=25℃

Ta=-40℃

0

0123456

Input Voltage:　V

IN

(V)

ＸＣ６１２１～ＸＣ６１２４(VDF=１.６Ｖ）

V

DR

V

DF

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

ＸＣ６１２１～ＸＣ６１２４(VDF=２.７Ｖ）

14.0

12.0

10.0

(μA)

SS

8.0

Ta=25℃

6.0

4.0

Supply Current:　I

2.0

0

0123456

ＸＣ６１２１～ＸＣ６１２４(VDF=２.７Ｖ）

2.90

(V)

DR

,V

DF

2.80

2.70

Detect, Release Voltage: V

2.60

-50 -25 0 25 50 75 100

Ta=85℃

Ta=-40℃

Input Voltage:　V

V

DR

V

DF

IN

(V)

Ambient Temperature: Ta (℃)

Series

17/26

XC6121/XC6122/XC6123/XC6124

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

（2.）Detect, Release Voltage vs. Ambient Temperature (Continued)

5.30

(V)

DR

,V

DF

5.20

5.10

5.00

Detect, Release Voltage: V

4.90

（3.）Nch Driver Output Current vs. VDS

(mA)

OUT

Output Current: I

（5.）Release Delay Time vs. Ambient Temperature

（ms）

DR

Release Delay Time　T

ＸＣ６１２１～ＸＣ６１２４(VDF=５.０Ｖ）

V

DR

V

DF

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

ＸＣ６１２１～ＸＣ６１２４

30

Ta=25℃

25

V

=5.0V

IN

20

VIN =4.0V

15

10

5

0

VIN =2.0V

VIN =1.0V

VIN =3.0V

0123456

(V)

V

DS

ＸＣ６１２１～ＸＣ６１２４

300

TDR=100mｓ

250

200

150

100

50

0

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

Series

（4.）Driver Output Current vs. Input Voltage

ＸＣ６１２１～ＸＣ６１２４

6.0
VDS=0.5V

5.0

(mA)

4.0

OUT

3.0

2.0

Output Current: I

1.0

0.0

0123456

Input Voltage:　V

ＸＣ６１２１～ＸＣ６１２４

3000

TDR=1600mｓ

2500

（ms）

DR

2000

1500

1000

500

Release Delay Time　T

0

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

18/26

(V)

IN

Ta=-40℃

Ta=25℃

Ta=85℃

XC6121/XC6122/XC6123/XC6124

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

（6.）Watchdog Timeout Period vs. Ambient Temperature

300

TWD=100mｓ

250

(ms)

　（ms）

WD

WD

200

150

100

50

WD Timeout Piriod T

WD Timeout Period T

0

-50 -25 0 25 50 75 100

ＸＣ６１２１～ＸＣ６１２４

Ambient Temperature: Ta (℃)

（7.）Release Delay Time vs. Input Voltage

4.0

（ms）

DR

Release Delay Time　T

Ta=25℃

3.8

T

3.6

3.4

3.2

3.0

2.8

2.6
01234567

ＸＣ６１２１～ＸＣ６１２４

=3.13mｓ

DR

Input Voltage:　V

IN

(V)

3000

TWD=1600mｓ

2500

(ms)

　（ms）

WD

WD

2000

1500

1000

500

WD Timeout Piriod T

WD Timeout Period T

0

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

（8.）Watchdog Timeout Period vs. Input Voltage

120

Ta=25℃
T

=100mｓ

WD

(ms)

　（ms）

WD

WD

115

110

105

100

95

WD Timeout Period T

WD Timeout Period T

90

01234567

ＸＣ６１２１～ＸＣ６１２４

ＸＣ６１２１～ＸＣ６１２４

Input Voltage:　V

IN

Series

(V)

（9.）

Watchdog Low Level Threshould vs. Ambient Temperature

6.0

(V)

5.0

WDL

4.0

3.0

2.0

1.0

WD　LowLevel　Threshold　V

0.0

-50 -25 0 25 50 75 100

ＸＣ６１２１～ＸＣ６１２４

VIN=6.0V

VIN=3.0V

VIN=1.76V

Ambient Temperature: Ta (℃)

（

10.）Watchdog High Level Threshould vs. Ambient Temperature

ＸＣ６１２１～ＸＣ６１２４

6.0

(V)

5.0

WDH

VIN=6.0V

4.0

3.0

2.0

VIN=3.0V

1.0

WD Highlevel Threshold　V

VIN=1.76V

0.0

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

19/26

g

XC6121/XC6122/XC6123/XC6124

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

（11.）Watchdog Pull-Down Resistance vs. Ambient Temperature

1100

1000

（ｋΩ)

WD

900

800

700

600

500

400

WDpull-down Resistance　R

300

-50-250 255075100

ＸＣ６１２１～ＸＣ６１２４

Ambient Temperature: Ta (℃)

Series

（12.）EN Pull-Up Resistance vs. Ambient Temperature

3.0

（MΩ)

2.4

EN

1.8

1.2

0.6

EN pull-up Resistance　R

0.0

-50 -25 0 25 50 75 100

ＸＣ６１２1～ＸＣ６１２２

Ambient Temperature: Ta (℃)

（14.）EN Ligh Level Voltage vs. Ambient Temperature

1.10

(V)

1.00

ENL

0.90

0.80

0.70

0.60

EN LowLevel Threshold　V

0.50

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

～

VIN=6.0V

VIN=3.0V

VIN=1.76V

20/26

（13.）ENB Pull-Down Resistance vs. Ambient Temperature

ＸＣ６１２３～ＸＣ６１２４

3.0

（MΩ)

2.4

ENB

1.8

1.2

0.6

ENBpull-down Resistance R

0.0

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

（15.）EN Hi

(V)

EN Highlevel Threshold　V

ENH

1.10

1.00

0.90

0.80

0.70

0.60

0.50

h Level Voltage vs. Ambient Temperature

ＸＣ６１２１～ＸＣ６１２２

VIN=6.0V

VIN=3.0V

VIN=1.76V

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

XC6121/XC6122/XC6123/XC6124

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

Series

（16.）ENB Low Level Voltage vs. Ambient Temperature

1.10

(V)

1.00

ENBL

0.90

0.80

0.70

0.60

ENB LowLevel Threshold　V

0.50

-50 -25 0 25 50 75 100

Ｘ

１２

～Ｘ

１２４

VIN=1.76V

Ambient Temperature: Ta (℃)

VIN=6.0V

VIN=3.0V

（17.）ENB High Level Voltage vs. Ambient Temperature

1.10

ＸＣ６１２３～ＸＣ６１２４

(V)

1.00

ENBH

0.90
VIN=6.0V

0.80
VIN=3.0V

0.70

VIN=1.76V

0.60

ENB　Highlevel Threshold　V

0.50

-50 -25 0 25 50 75 100
Ambient Temperature: Ta (℃)

21/26

XC6121/XC6122/XC6123/XC6124

■ PACKAGING INFORMATION

●SOT-25

●USP-6C Reference Pattern Layout

0.45

1

2

3

0.05

2.4

0.05

1.0

22/26

0.45

Unit :mm

6

5

4

Series

●USP-6C

Unit :mm

●USP-6C Reference Metal Mask Design

■MARKING RULE

① represents product series

MARK PRODUCT SERIES

E―

F―

H―

K―

② represents release delay time and watchdog timeout period

XC6121******

XC6122******

XC6123******

XC6124******

XC6121Series

WATCH DOG

TIMEOUT

PERIOD

PRODUCT

SERIES

MARK

0 3.13ms 50ms XC6121A2****

1 3.13 ms 100ms XC6121A3****

2 3.13 ms 200ms XC6121A4****

3 3.13 ms 400ms XC6121A5****

4 3.13 ms 800ms XC6121A7****

5 3.13 ms 1.6s XC6121A6****

6 50ms 50ms XC6121C2****

7 50ms 100ms XC6121C3****

8 50ms 200ms XC6121C4****

9 50ms 400ms XC6121C5****

A 50ms 800ms XC6121C7****

B 50ms 1.6s XC6121C6****

H 100ms 100ms XC6121D3****

C 100ms 200ms XC6121D4****

L 100ms 400ms XC6121D5****

D 100ms 800ms XC6121D7****

M 100ms 1.6s XC6121D6****

E

R 200ms 400ms XC6121E5****

F 200ms 800ms XC6121E7****

S 200ms 1.6s XC6121E6****

T 400ms 400ms XC6121F5****

K 400ms 800ms XC6121F7****

U 400ms 1.6s XC6121F6****

RELEASE

DELAY

TIME

200ms 200ms XC6121E4****

XC6121/XC6122/XC6123/XC6124

SOT25

54

① ② ③ ④

123

SOT-25

XC6122/XC6123/XC6124Series

RELEASE

MARK

N 3.13ms 50ms XC612*A2****

P 3.13ms 100ms XC612*A3****

R 3.13ms 200ms XC612*A4****

S 3.13ms 400ms XC612*A5****

T 3.13ms 800ms XC612*A7****

U 3.13ms 1.6s XC612*A6****

V 50ms 50ms XC612*C2****

X 50ms 100ms XC612*C3****

Y 50ms 200ms XC612*C4****

Z 50ms 400ms XC612*C5****

A 50ms 800ms XC612*C7****

B 50ms 1.6s XC612*C6****

A 100ms 100ms XC612*D3****

C 100ms 200ms XC612*D4****

B 100ms 400ms XC612*D5****

D 100ms 800ms XC612*D7****

C 100ms 1.6s XC612*D6****

D

E 200ms 400ms XC612*E5****

H 200ms 800ms XC612*E7****

F 200ms 1.6s XC612*E6****

K 400ms 400ms XC612*F5****

M 400ms 800ms XC612*F7****

L 400ms 1.6s XC612*F6****

DELAY

TIME

200ms 200ms XC612*E4****

WATCH DOG

TIMEOUT

PERIOD

PRODUCT

SERIES

Series

23/26

XC6121/XC6122/XC6123/XC6124

■MARKING RULE (Continued)

③ represents detect voltage

XC6121 Series

MARK

F 1.6 XC6121**16**

H 1.7 XC6121**17**

K 1.8 XC6121**18**

L 1.9 XC6121**19**

M 2.0 XC6121**20**

N 2.1 XC6121**21**

P 2.2 XC6121**22**

R 2.3 XC6121**23**

S 2.4 XC6121**24**

T 2.5 XC6121**25**

U 2.6 XC6121**26**

V 2.7 XC6121**27**

X 2.8 XC6121**28**

Y 2.9 XC6121**29**

Z 3.0 XC6121**30**

0 3.1 XC6121**31**

1 3.2 XC6121**32**

2

3 3.4 XC6121**34**

4 3.5 XC6121**35**

5 3.6 XC6121**36**

6 3.7 XC6121**37**

7 3.8 XC6121**38**

8 3.9 XC6121**39**

9 4.0 XC6121**40**

A 41 XC6121**41**

B 4.2 XC6121**42**

C 4.3 XC6121**43**

D 4.4 XC6121**44**

E 4.5 XC6121**45**

F 4.6 XC6121**46**

H 4.7 XC6121**47**

K 4.8 XC6121**48**

L 4.9 XC6121**49**

M 5.0 XC6121**50**

VOLTAGE

DETECT

(V)

3.3 XC6121**33**

PRODUCT

SERIES

XC6122/XC6123/XC6124 Series

MARK

Series

DETECT

VOLTAGE

(V)

H 1.6 XC612***16**

K 1.7 XC612***17**

L 1.8 XC612***18**

M 1.9 XC612***19**

N 2.0 XC612***20**

P 2.1 XC612***21**

R 2.2 XC612***22**

S 2.3 XC612***23**

T 2.4 XC612***24**

U 2.5 XC612***25**

V 2.6 XC612***26**

X 2.7 XC612***27**

Y 2.8 XC612***28**

Z 2.9 XC612***29**

0 3.0 XC612***30**

1 3.1 XC612***31**

2 3.2 XC612***32**

3

4 3.4 XC612***34**

5 3.5 XC612***35**

6 3.6 XC612***36**

7 3.7 XC612***37**

8 3.8 XC612***38**

9 3.9 XC612***39**

A 4.0 XC612***40**

B 41 XC612***41**

C 4.2 XC612***42**

D 4.3 XC612***43**

E 4.4 XC612***44**

F 4.5 XC612***45**

H 4.6 XC612***46**

K 4.7 XC612***47**

L 4.8 XC612***48**

M 4.9 XC612***49**

N 5.0 XC612***50**

3.3 XC612***33**

PRODUCT

SERIES

④ represents production lot number
0 to 9 and A to Z and inverted 0 to 9 and A to Z repeated. (G, I, J, O, Q, W excluded.)

24/26

■MARKING RULE (Continued)

① represents product series

MARK PRODUCT SERIES

P XC6121******

K XC6122******

R XC6123******

U XC6124******

② represents release delay time

MARK RELEASE DELAY TIME PRODUCT SERIES

A 3.13ms XC612*A*****

C 50ms XC612*C*****

D 100ms XC612*D*****

E 200ms XC612*E*****

F 400ms XC612*F*****

③ represents watchdog timeout period

MARK WATCHDOG TIMEOUT PERIOD PRODUCT SERIES

2 50ms XC612*2*****

3 100ms XC612*3*****

4 200ms XC612*4*****

5 400ms XC612*5*****

7 800ms XC612*7*****

6 1.6s XC612*6*****

④⑤ represents detect voltage

MARK

④ ⑤

3 3 3.3 XC612***33**

5 0 5.0 XC612***50**

⑥ represents production lot number

0 to 9 and A to Z repeated. (G, I, J, O, Q, W excluded.)

*No character inversion used.

DETECT VOLTAGE (V) PRODUCT SERIES

XC6121/XC6122/XC6123/XC6124

USP6C

①

1

2

3

④

⑤ ⑥

USP-6C

②

6

5

③

4

Series

25/26

XC6121/XC6122/XC6123/XC6124

1. The products and product specifications contained herein are subject to change without

notice to improve performance characteristics. Consult us, or our representatives

before use, to confirm that the information in this datasheet is up to date.

2. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this datasheet.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this datasheet.

4. The products in this datasheet are not developed, designed, or approved for use with

Series

such equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this datasheet within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

7. All rights reserved. No part of this datasheet may be copied or reproduced without the

prior permission of TOREX SEMICONDUCTOR LTD.

26/26