R3121N Series
36 V Input Voltage Detector with Release Delay Function for Automotive Applications
No. EC-532-190403
OVERVIEW
R3121N is the 36 V Maximum Input Voltage Detector (Maximum Rating：50 V). Selectable options of VDD
Pin Detection Type (R3121NxxxA), SENSE Pin Detection Type (R3121NxxxE) and VDD Pin Detection
without Hysteresis Type (R3121NxxxG), depending on the system configurations.
KEY BENEFITS
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Highly accurate voltage detection with detector threshold accuracy
1.5%
(Ta = 25C)
Selectable options of VDD Pin Detection, SENSE Pin Detection and VDD Pin Detection without Hysteresis
Adjustment of the release delay time (Power-on Reset Time) by connecting external capacitors
Reduction of mounting area by using compact package of SOT-23-6
KEY SPECIFICATIONS
Operating Voltage Range (Maximum Rating) :
R3121NxxxA/G: 1.4 V to 36.0 V (50.0 V)
R3121NxxxE : 2.4 V to 6.0 V (7.0 V)
Operating Temperature Range:
−40°C to 105°C (-AE)
−40°C to 125°C (-KE)
Supply Current: R3121NxxxA/G: Typ. 3.8
µ
A
R3121NxxxE:
Typ. 3.5
µ
A
Detector Threshold Range:
3.0 V to12.0 V ( in 0.1 V step)
Detector Threshold Accuracy:
1.5% (Ta = 25°C)
2.0% (−40°C ≤ Ta ≤ 105°C)
−2.2% to 2.5% (−40°C ≤ Ta ≤ 125°C)
Release Delay Accuracy:
−35% to 40% (−40°C ≤ Ta ≤105°C)
−40% to 80% (−40°C ≤ Ta ≤125°C)
SELECTION GUIDE
Product Name
R3121Nxxx-TR-#E
Package
SOT-23-6
Quantity
per Reel
3,000 pcs
xxx: Specify the detector threshold (−V
DET
) in the
range of 3.0 V (030) to 12.0 V (120) in 0.1 V step
* : Select the voltage detection type
A: VDD Pin Detection Type
E: SENSE Pin Detection Type
G: VDD Pin Detection without Hysteresis Type
#: Quality Class
#
Operating
Temp. Range
A
-40°C to 105°C
K
-40°C to 125°C
●
Test Temp.
25°C, High
Low, 25°C, High
TYPICAL APPLICATIONS
CIRCUITS
VR or DC/DC
VR or DC/DC
CD
VDD
R3121NxxxA/G
GND DOUT
C
D
Microprocessor
SENSE
CD
VDD
R3121NxxxE
5V
C
D
GND DOUT
Microprocessor
VDD Pin Detection Type
SENSE Pin Detection Type
PACKAGES
●
APPLICATIONS
Voltage monitoring for accessories such as car
audios, car navigation systems, and ETC system
Voltage monitoring for electronic control units
such as EV inverter and battery charge control
unit
1
SOT-23-6
2.9 x 2.8 x 1.1 (mm)
●
R3121N
No. EC-532-190403
SELECTION GUIDE
The detector threshold, the voltage detection type and the quality class are user selectable options.
Selection Guide
Product Name
R3121Nxxx-TR-#E
Package
SOT-23-6
Quantity per Reel
3,000 pcs
Pb Free
Yes
Halogen Free
Yes
xxx : Specify the detector threshold (−V
DET
) in the range of 3.0 V (030) to 12.0 V (120) in 0.1 V step.
Select
the voltage detection type from the following;
A: VDD Pin Detection Type
E: SENSE Pin Detection Type
G: VDD Pin Detection without Hysteresis Type
# : Quality Class
#
A
K
Operating Temp. Range
-40°C to 105°C
-40°C to 125°C
Test Temp.
25°C, High
Low, 25°C, High
BLOCK DIAGRAMS
R3121NxxxA/R3121NxxxG
SENSE
R3121NxxxE
VDD
DOUT
VDD
DOUT
Delay
Circuit
V
ref
GND
CD
V
ref
Delay
Circuit
GND
CD
2
R3121N
No. EC-532-190403
PIN DESCRIPTION
6
5
4
(mark side)
1
2
3
R3121N
(SOT-23-6)
Pin Configuration
R3121N Pin Description
Pin No.
1
2
3
SENSE
4
5
6
VDD
GND
DOUT
VD Voltage SENSE Pin (R3121NxxxE)
Input Supply Voltage Pin
Ground Pin
VD Output Pin, Nch Open Drain
Symbol
CD
NC
NC
Description
Release Delay Time Set Pin
No Connection
No Connection (R3121NxxxA/R3121NxxxG)
3
R3121N
No. EC-532-190403
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Symbol
V
DD
V
DOUT
V
CD
V
SENSE
I
DOUT
P
D
Tj
Tstg
Item
Rating
−0.3 to 50.0
−0.3 to 7.0
−0.3 to 7.0
−0.3 to 7.0
−0.3 to 50.0
20
830
−40 to 150
−55 to 150
Unit
V
V
V
V
mA
mW
°C
°C
Supply Voltage (R3121NxxxA/ R3121NxxxG)
Supply Voltage (R3121NxxxE)
DOUT Pin Output Voltage
CD Pin Output Voltage
SENSE Pin Input Voltage (R3121NxxxE)
DOUT Pin Output Current
Power Dissipation
(1)
Junction Temperature
Storage Temperature
SOT-23-6, JEDEC STD. 51
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause permanent damage
and may degrade the lifetime and safety for both device and system using the device in the field. The functional
operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS
Recommended Operating Conditions
Symbol
Item
V
DD
V
SENSE
Ta
Operating Voltage (R3121NxxxA/ R3121NxxxG)
(2)
Operating Voltage (R3121NxxxE)
(2)
SENSE Pin Input Voltage (R3121NxxxE)
Operating Temperature Range
R3121Nxxx*-AE
R3121Nxxx*-KE
Rating
1.4 to 36.0
2.4 to 6.0
0 to 36.0
−40 to 105
−40 to 125
Unit
V
V
C
RECOMMENDED OPERATING CONDITONS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if they are used over such conditions by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended
operating conditions.
(1)
Refer
(2)
to
POWER DISSIPATION
for detailed information.
Minimum value in V
DD
indicates the minimum operating voltage to define V
DOUT
.
4
R3121N
No. EC-532-190403
ELECTRICAL CHARACTERISTICS
C
D
= 1000 pF, pulled-up to 5 V with 100 kΩ, unless otherwise specified.
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 105°C.
(Ta =25°C)
R3121NxxxA/R3121NxxxG (-AE) (VDD Pin Detection Type)
Symbol
Parameter
Conditions
I
SS
−V
DET
Supply Current
Detector Voltage
V
DD
= −V
DET
−0.1 V
V
DD
= +V
DET
+1.0 V
Ta = 25°C
−40°C ≤ Ta ≤ 105°C
R3121NxxxA
R3121NxxxG
t
PHL
t
DELAY
I
DOUT
R
CDDIS
Detection Delay Time
(1)
Release Delay Time
(2)
Output Current (Nch Driver)
CD Pin Discharge NMOS
On-Resistance
V
DD
= 4.5V, V
DS
= 0.05 V
V
DD
= 13.0V, V
CD
= 0.5 V
Min.
Typ.
3.8
3.8
Max.
6.1
6.4
x 1.015
x 1.020
Unit
µA
V
%
mV
μs
ms
mA
kΩ
x 0.985
x 0.980
4.5
0
40
6.5
0.5
0.50
80
10
5
V
HYS
Detector Threshold Hysteresis
5.5
10
140
14
2.0
2.60
R3121NxxxE (-AE) (SENSE Pin Detection Type)
Symbol
Parameter
I
SS
R
SENSE
-V
DET
V
HYS
t
PHL
t
DELAY
I
DOUT
R
CDDIS
Supply Current
(3)
SENSE Resistance
Ta = 25°C
Detector Threshold
Detector threshold Hysteresis
Detector Delay Time
(4)
Release Delay Time
(5)
Output Current (Nch Driver)
CD Pin Discharge NMOS
On-Resistance
(Ta =25°C)
Conditions
Min.
Typ.
3.5
3.5
Max.
5.5
5.6
51.5
x 1.015
Unit
µA
MΩ
V
V
DD
= 5.0 V, V
SENSE
= −V
DET
−0.1 V
V
DD
= 5.0 V, V
SENSE
= +V
DET
+1.0 V
4.5
x 0.985
x 0.980
4.5
V
DD
= 4.5 V
V
DD
= 4.5 V
V
DD
= 5.0 V, V
DS
= 0.05 V
V
SENSE
= −V
DET
−0.1 V
V
DD
= 4.5 V, V
SENSE
= 13.0 V,
V
CD
= 0.5V
40
6.5
0.5
0.50
−40°C ≤ Ta ≤ 105°C
x 1.020
5
80
10
5.5
140
14.0
2.0
2.60
%
μs
ms
mA
kΩ
(1)
(2)
(3)
(4)
(5)
A time that V
DOUT
requires to reach 2.5 V when V
DD
changes from “−V
DET
+ 1.0 V” to “−V
DET
− 0.5 V”
A time that V
DOUT
requires to reach 2.5 V when V
DD
changes from “−V
DET
− 0.5 V” to “−V
DET
+ 1.0 V”
Not including the current for SENSE resistance
A time that V
DOUT
requires to reach 2.5 V when V
SENSE
changes from “−V
DET
+ 1.0 V” to “−V
DET
− 1.0 V”.
A time that V
DOUT
requires to reach 2.5 V when V
SENSE
changes from “+V
DET
− 1.0 V” to “+V
DET
+ 1.0 V”
5
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