RNA51957A,B
Voltage Detecting, System Resetting IC Series
REJ03D0912-0100
Rev.1.00
Oct 10, 2008
Description
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
µF)
•
Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage):
0.6 V (Typ) at R
L
= 22 kΩ
•
Wide supply voltage range: 2 V to 17 V
•
Wide application range
•
Ordering Information
Part Name
RNA51957AFPH0
RNA51957BFPH0
Package Type
SOP-8 pin
SOP-8 pin
Package Code
PRSP0008DE-C
PRSP0008DE-C
Package
Abbreviation
FP
FP
Taping Abbreviation
(Quantity)
H (2,500 pcs / Reel)
H (2,500 pcs / Reel)
Surface
Treatment
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
Outline and Article Indication
•
RNA51957A, B
Type No.
R957A
YMWC
CCC
SOP-8
R957B
YMWC
CCC
Pin No.1
Trace Code
Lot No.
Y : Year Code
(the last digit of year)
M : Month Code
W : Week Code
C : Control Code
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 1 of 12
RNA51957A,B
Pin Arrangement
RNA51957AFP/BFP
NC 1
Input 2
NC 3
GND 4
(Top view)
NC: No Connection
8 NC
7 Power-supply
6 Output
5 Delay capacitor
Outline: PRSP0008DE-C
Block Diagram
RNA51957A, B
Power-
supply
A: Built-in Load
B: Open Collector
5µA
Typ
Input
–
+
1.25V
–
25µA
Typ
Output
GND
Delay capacitor
Operating Waveform
RNA51957A, B
Input voltage
1.25V
t
H
td
td
Output state
L
td
≈
0.34
×
Cd(pF)
µs
t
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 2 of 12
RNA51957A,B
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
Kθ
Topr
Tstg
V
IN
Ratings
18
6
V
CC
18
400
4.4
–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)
Refer to the
thermal derating
curve.
8-pin SOP (PRSP0008DE-C)
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
—
—
—
1.6
—
—
—
—
–40
V
CC
–0.2
Typ
1.25
15
0.01
—
—
—
100
390
360
3.4
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
0.4
0.8
0.7
30
–17
—
Unit
V
mV
%/°C
V
V
nA
µA
ms
V
V
nA
µA
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 = 0.01µF *
L reset type, V
CC
= 5V, V
IN
< 1.2V, Isink = 4mA
L reset type minimum supply
voltage for IC operation
R
L
= 2.2kΩ, Vsat
≤
0.4V
R
L
= 100kΩ, 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
µF.
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 3 of 12
RNA51957A,B
Typical Characteristics
Thermal Derating
500
Detection Voltage vs. Ambient Temperature
1.28
Power Dissipation Pd (mW)
Detection Voltage V
S
(V)
400
300
200
100
0
0
8-pin SOP
(PRSP0008DE-C)
1.27
V
SH
1.26
1.25
1.24
1.23
1.22
–40 –20
V
SL
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
= 1.25V
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
= 0.01µF
Delay Capacitance Cd (µF)
10
7
V
CC
= 5V
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)
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 4 of 12
RNA51957A,B
Canstant Current at Cd pin vs. Ambient Temperature
Canstant Current at Cd pin Ipd (µA)
Threshold Operating Voltage
1.0
Output Voltage V
OUT
(V)
Ta = 25°C
–12
–10
–8
–6
–4
–2
0
–40 –20
V
CC
= 5V
V
CC
= 15V
0.8
0.6
R
L
= 2.2kΩ
0.4
0.2
0
0
R
L
= 22kΩ
R
L
= 100kΩ
0
20
40
60
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
(RNA51957A)
Output Load Current I
CC
(µA)
Output Saturation Voltage Vsat (V)
Output Saturation Voltage vs. Output Sink Current
0.3
Supply voltage detecting "L" reset type
: V
CC
= 4V
Except above mentioned
: V
CC
= 5V
–40
0.2
–30
V
CC
= 5V
V
CC
= 10V
V
CC
= 15V
–20
0.1
–10
0
0
1
2
3
4
5
6
0
0
4
8
12
16
Output Sink Current Isink (mA)
Circuit Current vs. Supply Voltage
(RNA51957B)
800
Ta = –40°C
Output Voltage V
O
(V)
Circuit Current I
CC
(µA)
600
400
Ta = 25°C
Ta = 85°C
200
0
0
4
8
12
16
Supply Voltage V
CC
(V)
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 5 of 12
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