Preliminary
Datasheet
RNA51951A, B
Voltage Detecting, System Resetting IC Series
Description
R03DS0003EJ0301
Rev.3.01
Apr 19, 2011
RNA51951A,B are semiconductor integrated circuits designed for detecting supply voltage and resetting all types of
logic circuits such as CPUs.
They include a built-in delay circuit to provide a retardation time (200
s
Typ).
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
Few external parts
Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage):
0.6 V (Typ) at RL = 22 k
Wide supply voltage range: 2 V to 17 V
Wide application range
Ordering Information
Part Name
RNA51951AFPH0
RNA51951APT0
RNA51951AUPH1
RNA51951BFPH0
RNA51951BPT0
RNA51951BUPH1
Package Type
SOP-8 pin
DIP-8 pin
UPAK
SOP-8 pin
DIP-8 pin
UPAK
Package Code
PRSP0008DE-C
PRDP0008AF-B
PLZZ0004CA-A
PRSP0008DE-C
PRDP0008AF-B
PLZZ0004CA-A
Package
Abbreviation
FP
P
UP
FP
P
UP
Taping Abbreviation
(Quantity)
H (2,500 pcs / Reel)
T (1,000 pcs / Box)
H (1,000 pcs / Reel)
H (2,500 pcs / Reel)
T (1,000 pcs / Box)
H (1,000 pcs / Reel)
Surface
Treatment
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
1 (Sn-Bi)
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
1 (Sn-Bi)
Application
Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and MCU, Reset of logic circuit, Battery check circuit,
switching circuit back-up voltage, level detecting circuit, waveform shaping circuit, delay waveform generating
circuit, DC/DC converter, over voltage protection circuit
Recommended Operating Condition
Supply voltage range: 2 V to 17 V
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
Page 1 of 9
RNA51951A, B
Preliminary
Outline and Article Indication
•
RNA51951A, B
Part No.
R951A
YMWC
CCC
SOP-8
R951B
YMWC
CCC
Pin No.1
Lot No.
Y: Year Code
(the last digit of year)
M: Month Code
W: Week Code
C: Control Code
Trace Code
Part No.
R5 1 9 5 1A
Y MW
DIP-8
R5 1 9 5 1B
Y MW
W: Week Code
M: Month Code
Y: Year Code
Part No.
5 1 A
5 1 B
Y MW
UPAK
Y MW
W: Week Code
M: Month Code
Y: Year Code
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
Page 2 of 9
RNA51951A, B
Preliminary
Pin Arrangement
RNA51951A, B
NC 1
NC 2
NC 3
GND 4
(Top view)
NC: No Connection
Outline: PRSP0008DE-C (SOP-8)
PRDP0008AF-B (DIP-8)
Outline: PLZZ0004CA-A (UPAK)
8 NC
7 Power-supply
2
6 Output
5 NC
(Top view)
1
Supply voltage
GND
RNA51951A, B
3
Output
Block Diagram
RNA51951A, B
Supply
voltage
A: Built-in Load
B: Open Collector
R1
–
R2
+
1.25 V
–
25
μA
Typ
Output
C
Delay capacitor
GND
Operating Waveform
RNA51951A, B
Supply voltage
4.25 V
0.65 V
t
H
td
td
Output state
L
Output
undefined
td
≈
200
μs
t
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
Page 3 of 9
RNA51951A, B
Preliminary
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Supply voltage
Output sink current
Output voltage
Symbol
V
CC
Isink
V
O
Ratings
18
6
V
CC
18
400
570
800
*
4.4
8.3
–40 to +85
–55 to +125
1
Unit
V
mA
V
Conditions
Power dissipation
Pd
mW
Thermal derating
Operating temperature
Storage temperature
Note:
K
Topr
Tstg
mW/°C
°C
°C
Type A (output with constant current load)
Type B (open collector output)
8-pin SOP (PRSP0008DE-C)
8-pin DIP (PRDP0008AF-B)
UPAK (PLZZ0004CA-A)
8-pin SOP (PRSP0008DE-C)
Refer to the thermal
derating curve.
8-pin DIP (PRDP0008AF-B)
1. 15 mm
25 mm
0.7 mmt alumina ceramic board, Ta
25°C. If Ta > 25°C, derate by 6.4 mW/°C.
Electrical Characteristics
(Ta = 25°C, unless otherwise noted)
“L” reset type
Item
Detecting voltage
Hysteresis voltage
Detecting voltage
temperature coefficient
Circuit current
Delay time
Output saturation voltage
Threshold operating
voltage
Output leakage current
Output load current
Output high voltage
Symbol
V
S
V
S
V
S
/T
I
CC
t
pd
Vsat
V
OPL
I
OH
I
OC
V
OH
Min
4.05
30
—
—
—
80
—
—
—
—
–40
V
CC
–0.2
Typ
4.25
50
0.01
450
420
200
0.2
0.67
0.55
—
–25
V
CC
–0.06
Max
4.45
80
—
680
630
500
0.4
0.8
0.7
30
–17
—
Unit
V
mV
%/°C
A
s
V
V
nA
A
V
Type A, V
CC
= 5V
Type B, V
CC
= 5V
V
CC
= 4V, Isink = 4mA
R
L
= 2.2k, Vsat
0.4V
R
L
= 100k, Vsat
0.4V
Type B
Type A, V
CC
= 5V, V
O
= 1/2
V
CC
Type A
Test Conditions
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
Page 4 of 9
RNA51951A, B
Preliminary
Typical Characteristics
Thermal Derating
900
Power Dissipation Pd (mW)
Detection Voltage V
S
(V)
Detection Voltage vs. Ambient Temperature
4.34
4.32
4.30
4.28
4.26
V
SL
V
SH
800
700
600
500
400
300
200
100
0
0
25
50
75
85
100 125 150
8-pin SOP
(PRSP0008DE-C)
8-pin DIP
(PRDP0008AF-B)
UPAK
(PLZZ0004CA-A)
4.24
4.22
–40 –20
0
20
40
60
80 100
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Delay Time vs. Ambient Temperature
350
Output Voltage V
OUT
(V)
Threshold Operating Voltage
1.0
0.8
0.6
R
L
= 2.2 kΩ
Ta = 25°C
300
Delay Time t
pd
(μs)
250
V
CC
= 5V
200
150
100
50
0
–40 –20
0
20
40
60
10V
V
CC
= 15V
0.4
0.2
0
0
R
L
= 22 kΩ
R
L
= 100 kΩ
80 100
0.2
0.4
0.6
0.8
1.0
Ambient Temperature Ta (°C)
Supply Voltage V
CC
(V)
Output Load Current vs. Output Voltage
(RNA51951A)
Output Load Current I
CC
(μA)
Output Saturation Voltage vs. Output Sink Current
Output Saturation Voltage Vsat (V)
0.3
V
CC
= 4 V
–40
0.2
–30
V
CC
= 5 V
V
CC
= 10 V V
CC
= 15 V
–20
0.1
–10
0
0
1
2
3
4
5
6
0
0
4
8
12
16
Output Sink Current Isink (mA)
Output Voltage V
O
(V)
R03DS0003EJ0301 Rev.3.01
Apr 19, 2011
Page 5 of 9
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