Preliminary
Datasheet
RNA51955A, B
Voltage Detecting, System Resetting IC Series
Description
R03DS0004EJ0202
Rev.2.02
Apr 19, 2011
RNA51955A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs, and has
the feature of setting the detection voltage by adding external resistance.
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
RNA51955AFPH0
RNA51955APT0
RNA51955BFPH0
RNA51955BPT0
Package Type
SOP-8 pin
DIP-8 pin
SOP-8 pin
DIP-8 pin
Package Code
PRSP0008DE-C
PRDP0008AF-B
PRSP0008DE-C
PRDP0008AF-B
Package
Abbreviation
FP
P
FP
P
Taping Abbreviation
(Quantity)
H (2,500 pcs / Reel)
T (1,000 pcs / Box)
H (2,500 pcs / Reel)
T (1,000 pcs / Box)
Surface
Treatment
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
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
R03DS0004EJ0202 Rev.2.02
Apr 19, 2011
Page 1 of 11
RNA51955A, B
Preliminary
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Supply voltage
Output sink current
Output voltage
Power dissipation
Thermal derating
Operating temperature
Storage temperature
Input voltage range
Symbol
V
CC
Isink
V
O
Pd
K
Topr
Tstg
V
IN
Ratings
18
6
V
CC
18
400
570
4.4
8.3
–40 to +85
–55 to +125
–0.3 to V
CC
–0.3 to +7
Unit
V
mA
V
mW
mW/°C
°C
°C
V
V
CC
7 V
V
CC
> 7 V
Conditions
Type A (output with constant current load)
Type B (open collector output)
8-pin SOP (PRSP0008DE-C)
8-pin DIP (PRDP0008AF-B)
8-pin SOP (PRSP0008DE-C)
Refer to the thermal
derating curve.
8-pin DIP (PRDP0008AF-B)
Electrical Characteristics
(Ta = 25°C, unless otherwise noted)
“L” reset type
Item
Detecting voltage
Hysteresis voltage
Detecting voltage
temperature coefficient
Supply voltage range
Input voltage range
Input current
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
V
CC
Vin
I
IN
I
CC
t
pd
Vsat
V
OPL
I
OH
I
OC
V
OH
Min
1.20
9
—
2
–0.3
–0.3
—
—
—
80
—
—
—
—
–40
V
CC
–0.2
Typ
1.25
15
0.01
—
—
—
100
390
360
200
0.2
0.67
0.55
—
–25
V
CC
–0.06
Max
1.30
23
—
17
V
CC
7.0
500
590
540
500
0.4
0.8
0.7
30
–17
—
Unit
V
mV
%/°C
V
V
nA
A
s
V
V
nA
A
V
L reset type, V
CC
= 5V, V
IN
< 1.2V, Isink = 4mA
L reset type minimum supply
voltage for IC operation
R
L
= 2.2k, Vsat
0.4V
R
L
= 100k, Vsat
0.4V
V
CC
7V
V
CC
> 7V
V
IN
= 1.25V
V
CC
= 5V
Test Conditions
Type A
, V
CC
= 5V
Type B
, V
CC
= 5V
Type B
Type A
, V
CC
= 5V, V
O
= 1/2
V
CC
Type A
R03DS0004EJ0202 Rev.2.02
Apr 19, 2011
Page 4 of 11
RNA51955A, B
Preliminary
Typical Characteristics
Thermal Derating
600
Detection Voltage vs. Ambient Temperature
1.28
Power Dissipation Pd (mW)
Detection Voltage V
S
(V)
500
400
300
200
100
0
0
8-pin DIP
(PRDP0008AF-B)
1.27
V
SH
1.26
1.25
1.24
1.23
1.22
–40 –20
V
SL
8-pin SOP
(PRSP0008DE-C)
25
50
75
85
100
125
0
20
40
60
80 100
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Detection Voltage vs. Supply Voltage
1.28
Input Current vs. Supply Voltage
250
V
IN
= 1.25 V
Detection Voltage V
S
(V)
Input Current I
IN
(nA)
1.27
1.26
1.25
V
SL
V
SH
200
150
Ta = –40°C
100
Ta = 25°C
1.24
1.23
1.22
0
50
0
0
Ta = 85°C
4
8
12
16
20
4
8
12
16
20
Supply Voltage V
CC
(V)
Supply Voltage V
CC
(V)
Delay Time vs. Ambient Temperature
350
Threshold Operating Voltage
1.0
Ta = 25°C
Output Voltage V
OUT
(V)
300
Delay Time t
pd
(μs)
0.8
0.6
R
L
= 2.2 kΩ
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)
R03DS0004EJ0202 Rev.2.02
Apr 19, 2011
Page 5 of 11
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