M51951A,B/M51952A,B
Voltage Detecting, System Resetting IC Series
REJ03D0775-0400
Rev.4.00
Sep 18, 2007
Description
M51951A,B/M51952A,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
µs
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 R
L
= 22 kΩ
•
Wide supply voltage range: 2 V to 17 V
•
Wide application range
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
Pin Arrangement
M51951AL/BL
M51952AL/BL
5 Output
4 NC
3 GND
1 Supply voltage
2 NC
1 Supply voltage
(Top view)
Package: 5P5T
(Top view)
Package: PLZZ0004CB-A (SOT-89)
M51951AML/BML
M51952AML/BML
3 Output
2 GND
M51951ASL/BSL
M51952ASL/BSL
1. Supply voltage
2. GND
1
3. Output
2
3
(Top view)
Package: PRSS0003DF-A (TO-92L)
REJ03D0775-0400 Rev.4.00 Sep 18, 2007
Page 1 of 7
M51951A,B/M51952A,B
Block Diagram
M51951A, B
Supply
voltage
A: Built-in Load
B: Open Collector
M51952A, B
Supply
voltage
A: Built-in Load
B: Open Collector
R1
–
R2
+
1.25V
–
25µA
Typ
R1
Output
R2
–
+
1.25V
+
25µA
Typ
Output
C
Delay capacitor
C
Delay capacitor
GND
GND
Operating Waveform
M51951A, B
Supply voltage
M51952A, B
Supply voltage
4.25V
0.65V
t
H
td
td
4.25V
t
H
td
td
Output state
L
Output
undefined
td
≈
200µs
Output state
L
td
≈
200µs
t
t
REJ03D0775-0400 Rev.4.00 Sep 18, 2007
Page 2 of 7
M51951A,B/M51952A,B
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Supply voltage
Output sink current
Output voltage
Power dissipation
Symbol
V
CC
Isink
V
O
Pd
Ratings
18
6
V
CC
18
450
700
500
Thermal derating
Kθ
4.5
7
5
Operating temperature
Storage temperature
Topr
Tstg
–30 to +85
–40 to +125
°C
°C
mW/°C
mW
Unit
V
mA
V
Type A (output with constant current load)
Type B (open collector output)
5-pin SIP
3-pin SIP
3-pin SOP
Ta
≥
25°C
5-pin SIP
3-pin SIP
3-pin SOP
Conditions
Electrical Characteristics
(Ta = 25°C, unless otherwise noted)
•
“L” reset type M51951A, M51951B
•
“H” reset type M51952A, M51952B
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
0.2
0.67
0.55
—
–25
V
CC
–0.06
Max
4.45
80
—
680
630
500
0.4
0.4
0.8
0.7
30
–17
—
nA
µA
V
V
µs
V
L reset type, V
CC
= 4V, Isink = 4mA
H reset type, V
CC
= 5V, Isink = 4mA
L reset type minimum supply
voltage for IC operation
R
L
= 2.2kΩ, Vsat
≤
0.4V
R
L
= 100kΩ, Vsat
≤
0.4V
Unit
V
mV
%/°C
µA
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
REJ03D0775-0400 Rev.4.00 Sep 18, 2007
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M51951A,B/M51952A,B
Typical Characteristics
Thermal Derating
(Maximum Rating)
1000
Power Dissipation Pd (mW)
Detection Voltage V
S
(V)
Detection Voltage vs. Ambient Temperature
(Supply voltage detection series)
4.34
4.32
4.30
4.28
4.26
V
SL
V
SH
800
600
400
200
0
0
3-pin SIP
3-pin SOP
5-pin SIP
4.24
4.22
–40 –20
25
50
75
100
125
0
20
40
60
80 100
Ambient Temperature Ta (°C)
Delay Time vs. Ambient Temperature
(M5195xx, Built-in capacitor type)
350
Output Voltage V
OUT
(V)
Ambient Temperature Ta (°C)
Threshold Operating Voltage
([L] reset type)
1.0
0.8
0.6
R
L
= 2.2kΩ
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
= 22kΩ
R
L
= 100kΩ
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
(M5195xA)
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)
Output Voltage V
O
(V)
REJ03D0775-0400 Rev.4.00 Sep 18, 2007
Page 4 of 7
M51951A,B/M51952A,B
Circuit Current vs. Ambient Temperature
(M51951B, M51952B)
700
Circuit Current I
CC
(µA)
600
500
400
300
200
100
0
–40 –20
0
20
40
60
80 100
V
CC
= 5V
Ambient Temperature Ta (°C)
Example of Application Circuit
Reset Circuit of M5195xx Series
V
CC
Supply
voltage
M51951x
M51952x
GND
Output
R
L
Supply
voltage
RESET (RESET)
Logic circuit
GND
Figure 1 Reset Circuit of M5195xx Series
Notes: 1. When the detecting supply voltage is 4.25 V, M51951, M51952, M51953 and M51954 are used.
When the voltage is anything except 4.25 V, M51955, M51956, M51957 and M51958 are used.
2. When the delay time is short, M51951, M51952, M51955 and M51956 are available. These ICs have a
delay capacity and the delay time is about 200
µs.
If a longer delay time is necessary, M51953, M51954, M51957 and M51958 are used.
3. If the M5195xx and the logic circuit share a common power source, type A (built-in load type) can be used
whether a pull-up resistor is included in the logic circuit or not.
4. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor R
L
to
overcome the pull-down resistor.
5. When the reset terminal in the logic circuit is of the low reset type, M51951, M51953, M51955 and M51957
are used and when the terminal is of the high reset type, M51952, M51954, M51956 and M51958 are used.
6. When a negative supply voltage is used, the supply voltage side of M5195xx and the GND side are
connected to negative supply voltage respectively.
REJ03D0775-0400 Rev.4.00 Sep 18, 2007
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