R3121N Series
36 V Input Voltage Detector with Release Delay Function
OVERVIEW
No. EA-532-190403
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
●
●
●
●
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
SELECTION GUIDE
Quantity
per Reel
3,000 pcs
●
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)
Product Name
R3121Nxxx*-TR-FE
Package
SOT-23-6
●
Operating Temperature Range: −40°C to 85°C
●
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)
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
●
Detector Threshold Accuracy:
1.5% (Ta = 25°C)
2.0% (−40°C ≤ Ta ≤ 85°C)
●
Release Delay Accuracy:
−35% to 40% (−40°C ≤ Ta ≤ 85°C)
TYPICAL APPLICATIONS
VR or DC/DC
VR or DC/DC
CD
VDD
R3121NxxxA/G
GND DOUT
C
D
Microprocessor
SENSE
CD
5V
C
D
VDD
R3121NxxxE
GND DOUT
Microprocessor
VDD Pin Detection Type
SENSE Pin Detection Type
PACKAGES
●
APPLICATIONS
Power supply voltage monitoring for Laptop
PCs, Digital TVs, Cordless phones and Private
LAN systems
Power supply voltage monitoring for devises with
multi-cell battery
SOT-23-6
2.9 x 2.8 x 1.1 (mm)
●
1
R3121N
No. EA-532-190403
SELECTION GUIDE
The detector threshold and the voltage detection type are user selectable options.
Selection Guide
Product Name
R3121Nxxx-TR-FE
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
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. EA-532-190403
PIN DESCRIPTION
6
5
4
(mark side)
1
2
3
R3121N
(SOT-23-6)
Pin Configuration
R3121N Pin Description
Pin No.
Symbol
Description
1
2
3
4
5
6
CD
NC
NC
SENSE
VDD
GND
DOUT
Release Delay Time Set Pin
No Connection
No Connection (R3121NxxxA/R3121NxxxG)
VD Voltage SENSE Pin (R3121NxxxE)
Input Supply Voltage Pin
Ground Pin
VD Output Pin, Nch Open Drain
3
R3121N
No. EA-532-190403
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Symbol
Item
Rating
Unit
V
DD
V
DOUT
V
CD
V
SENSE
I
DOUT
P
D
Tj
Tstg
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
ABSOLUTE MAXIMUM RATINGS
−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
660
−40 to 125
−55 to 125
V
V
V
V
mA
mW
°C
°C
SOT-23-6, JEDEC STD. 51
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
Rating
Unit
V
DD
V
SENSE
Ta
Operating Voltage (R3121NxxxA/ R3121NxxxG)
(2)
Operating Voltage (R3121NxxxE)
(2)
SENSE Pin Input Voltage (R3121NxxxE)
Operating Temperature Range
RECOMMENDED OPERATING CONDITONS
1.4 to 36.0
2.4 to 6.0
0 to 36.0
−40 to 85
V
V
C
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)
(2)
Refer to
POWER DISSIPATION
for detailed information.
Minimum value in V
DD
indicates the minimum operating voltage to define V
DOUT
.
4
R3121N
No. EA-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 ≤ 85°C.
(Ta =25°C)
R3121NxxxA/R3121NxxxG (VDD Pin Detection Type)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
I
SS
−V
DET
V
HYS
t
PHL
t
DELAY
I
DOUT
R
CDDIS
Supply Current
Detector Voltage
Detector Threshold Hysteresis
Detection Delay Time
(1)
Release Delay Time
(2)
Output Current (Nch Driver)
CD Pin Discharge NMOS
On-Resistance
V
DD
= −V
DET
−0.1 V
V
DD
= +V
DET
+1.0 V
Ta = 25°C
−40°C ≤ Ta ≤ 85°C
R3121NxxxA
R3121NxxxG
x 0.985
x 0.980
4.5
0
40
6.5
V
DD
= 4.5V, V
DS
= 0.05 V
V
DD
= 13.0V, V
CD
= 0.5 V
0.5
0.50
3.8
3.8
6.1
6.4
x 1.015
x 1.020
µA
V
%
mV
μs
ms
mA
kΩ
5
80
10
5.5
10
140
14
2.0
2.60
R3121NxxxE (SENSE Pin Detection Type)
Symbol
Parameter
(Ta =25°C)
Conditions
Min.
Typ.
Max.
Unit
I
SS
R
SENSE
-V
DET
V
HYS
t
PHL
t
DELAY
I
DOUT
R
CDDIS
Supply Current
(3)
SENSE Resistance
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
Ta = 25°C
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
3.5
3.5
5.5
5.6
51.5
x 1.015
x 1.020
µA
MΩ
V
%
μs
ms
mA
kΩ
Detector Threshold
Detector threshold Hysteresis
Detector Delay Time
(4)
Release Delay Time
(5)
Output Current (Nch Driver)
CD Pin Discharge NMOS
On-Resistance
−40°C ≤ Ta ≤ 85°C
5
80
10
5.5
140
14.0
2.0
2.60
(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”
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