Preliminary
Datasheet
RNA51957A, B
Voltage Detecting, System Resetting IC Series
Description
R03DS0010EJ0500
Rev.5.00
Jun 19, 2012
RNA51957A,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 the desired retardation time simply by adding an external capacitor.
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
Few external parts
Large delay time with a capacitor of small capacitance (td
100 ms, at 0.33
F)
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
RNA51957AFPH0
RNA51957APT0
RNA51957BFPH0
RNA51957BPT0
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
R03DS0010EJ0500 Rev.5.00
Jun 19, 2012
Page 1 of 13
RNA51957A, 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
Constant current
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
Ipd
Vsat
V
OPL
I
OH
I
OC
V
OH
Min
1.20
9
—
2
–0.3
–0.3
—
—
—
1.6
–8
—
—
—
—
–40
V
CC
–0.2
Typ
1.25
15
0.01
—
—
—
100
390
360
3.4
–5
0.2
0.67
0.55
—
–25
V
CC
–0.06
Max
1.30
23
—
17
V
CC
7.0
500
590
540
7.0
–3
0.4
0.8
0.7
30
–17
—
Unit
V
mV
%/°C
V
V
nA
A
ms
A
V
V
nA
A
V
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
Cd = 0.01F *
V
CC
= 5V
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
Type B
Type A
, V
CC
= 5V, V
O
= 1/2
V
CC
Type A
Note:
Please set the desired delay time by attaching capacitor of the range between 4700 pF and 10
F.
R03DS0010EJ0500 Rev.5.00
Jun 19, 2012
Page 4 of 13
RNA51957A, 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
250
Input Current vs. Supply Voltage
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 Capacitance vs. Delay Time
Delay Time vs. Ambient Temperature
6
C
D
= 0.01
μF
Delay Capacitance Cd (μF)
10
7
V
CC
= 5 V
5
3
1
7
5
3
0.1
7
5
3
0.01
7
5
3
0.001
0.1
3 57 1
3 5 7 10 3 5 7 100 3 5 7 1000
Delay Time t
pd
(ms)
5
4
V
CC
= 5V
3
2
1
0
–40 –20
10V
V
CC
= 15V
0
20
40
60
80 100
Delay Time t
pd
(ms)
Ambient Temperature Ta (°C)
R03DS0010EJ0500 Rev.5.00
Jun 19, 2012
Page 5 of 13
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