R5104V SERIES
Microprocessor power management with Watchdog Timer
2005/12/01
1
OUTLINE
The R5104V Series are high voltage tolerance CMOS-based
con power management ICs with high
accuracy output voltage and detector threshold and with ultra low supply current. Each of these ICs consists of a
voltage regulator, a voltage detector and a watchdog timer. Thus, the R5104V Series have the function of a
power management for microprocessor, a monitor of the voltage of a power source and a microprocessor
supervisor.
The built-in voltage regulator with an external driver transistor can supply Min.1A current to a system.
Therefore these ICs are very suitable for various power supply systems for microprocessors. The output voltage
is monitored by the voltage detector which is built-in these ICs.
The built-in voltage detector has an output delay function and the delay time can be set by an external
capacitor (C
D
).
The output voltage and the detector threshold voltage can be set individually for each IC by laser trimming.
Furthermore, when a microprocessor works incorrectly, the watchdog timer which checks over microprocessor
generates reset signals intermittently to prevent a whole system from being malfunction.
The timeout periods for watchdog and reset can also be set individually by an external capacitor (C
TW
).
There are two kinds of power down function: "A" version turns off the supervisor of clock input for the
watchdog timer, while the "B" version turns off all the circuits and realizes the standby mode.
FEATURES
Built-in a watchdog timer
Timeout period for watchdog and generating a reset signal can be set by an external capacitor
Watchdog timer can be stopped individually by CE Pin
Low supply current ......................................... Typ. 45A (I
OUT
=
0mA)
The output voltage of the voltage regulator in a range from 3.3V to 5.0V, the detector threshold voltage in a
range from 2.8V to 4.0V can be set individually with a step of 0.1V for each IC by laser-trim.
High Accuracy Output Voltage of Voltage Regulator and Detector Threshold .....
2.0%
Power-on Reset Delay Time can be set by an external capacitor
Standby Current (B version) ......................... Typ. 0.1
A
Maximum Operating Input Voltage ............... Max. 36V
Small Package ............................................. SSOP-10
APPLICATION
Power source for microprocessors
R5104V
2
BLOCK DIAGRAMS
A version
B vesion
GND
VOUT
VDD
CD
CTW
SCK
RESET
CE
8
10
3
1
6
5
9
7
EXT
4
Vref
WDT
Level Shift
ISENSE
2
-
+
-
+
-
+
Vref
CURRENT
LIMIT
GND
VOUT
VDD
CD
CTW
SCK
RESET
CE
8
10
3
1
6
5
9
7
EXT
4
Vref
WDT
Level Shift
ISENSE
2
-
+
-
+
-
+
Vref
CURRENT
LIMIT
R5104V
3
SELECTION GUIDE
The selection can be made with designating the part number as shown below:
R5104Vxxxx-TR
Part Number
a b c d
Code Contents
a
Designation of Package Type;
V:SSOP-10 (3.1mm x 6.4mm)
b
Serial Number for Voltage setting combination from 001
c
Alphabetical Code for Mask Versions (Power-down mode)
A: Watchdog timer off type
B: Standby mode type
d
Designation of Taping TypeE2 is described as standard.
PIN CONFIGURATION
SSOP-10
1
2
4
5
10
9
8
7
6
3
PIN DESCRIPTIONS
Pin No
Symbol
Pin Description
1 V
DD
Power supply Pin Clock
2 I
SENSE
Sense Pin for Current Limit of VR.
Monitoring the dropout voltage generated at an external resistor
between pin 1 and pin 2, if the dropout exceeds 0.3V (Typ.),
the current limit works.
3 V
OUT
Output Pin for Voltage Regulator
4
EXT
External Transistor Drive Pin
5
RESET
Output Pin for Reset signal of Watchdog timer and Voltage Detector.
(Output Type is Nch Open Drain, Output "L" at detecting Detector
Threshold and Watchdog Timer Reset.)
6
SCK
Clock Input Pin from Microprocessor
7 C
TW
External Capacitor Pin for Setting Reset and Watchdog Timeout Periods
8 C
D
External Capacitor Pin for Setting Delay Time of Voltage Detector
9 CE
Control Switch Pin for halting Watchdog timer (A version),
or Chip Enable Pin (B version)
10 GND
Ground
Pin
R5104V
4
ABSOLUTE MAXIMUM RATINGS
Symbol Item
Rating
Unit
V
DD
Supply
Voltage
-0.3~50
V
V
PEAK
Peak Input Voltage (*Note 1)
60
V
V
CD
Voltage of C
D
Pin
V
SS
-
0.3 to 7.5
V
V
CTW
Voltage of C
TW
Pin
V
SS
-
0.3 to 7.5
V
V
OUT
Voltage of V
OUT
Pin
V
SS
-
0.3 to 7.5
V
V
RESET
Output Voltage
Voltage of
RESET
Pin
V
SS
-
0.3 to 7.5
V
V
CE
Voltage of CE Pin
V
SS
-
0.3~V
IN
+0.3
V
V
ISENSE
Voltage of I
SENSE
Pin
V
SS
-
0.3~V
IN
+0.3
V
V
SCK
Input Voltage
Voltage of SCK Pin
V
SS
-
0.3~V
IN
+0.3
V
I
EXT
Current of EXT Pin
10
mA
I
RESET
Output Current
Current of
RESET
Pin
20
mA
P
D
Power
Dissipation
300
mW
Topt Operating
Temperature Range
-40~+125
C
Tstg Storage
Temperature
Range
-55~+140
C
*Note 1 duration time=200ms
Do not force any voltage more than supply voltage to C
D
, C
TW
, V
OUT
, and
RESET
pins.
Operational Ratings (Electrical Characteristics)
Application circuits of semiconductors should be designed with operating within the operational ratings of the
semiconductors. Even the noise or surge, if their level is beyond the operational ratings, normal operation of the
semiconductor may not be expected. If the application circuits make the semiconductor operate beyond the
condition of operational ratings, the quality assurance level of the semiconductor cannot be maintained.
Absolute Maximum Ratings
Absolute maximum ratings are threshold limit values that must not be exceeded even for any moment under
any conditions. More over, such values for any two or more items of the ratings must not be reached
simultaneously. Operation above these absolute maximum ratings may cause degradation or fatal damage to
the device. These mean stress ratings and do not necessarily imply functional operation below these limits.
R5104V
5
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
IN
=
CE
=
I
SENSE
=
12V, I
OUT
=
100mA, C
CTW
=
0.1
F, C
D
=
0.01
F)
R5104VxxxA(Overall)
Topt
=
25
C
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
V
IN
Operating
Voltage
36 V
I
SS
Supply
Current
I
OUT
=
0mA
45 80
A
Ioff
Supply Current (WDT inactive)
V
IN
=
12V, CE
=
0V
45 80
A
V
CEH
CE Input Voltage "H"
2.0
V
IN
+0.3
V
V
CEL
CE Input Voltage "L"
0.0
0.25
V
VR part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
V
OUT
Output
Voltage
0.98
1.02
V
I
OUT
Output Current(*Note 2)
V
IN
=
12V
1.0 A
V
DIF
Dropout Voltage(*Note 2)
I
OUT
=
300mA
50 mV
V
OUT
/
I
OU
T
Load Regulation(*Note 2)
V
IN
=
12V
1mA
<
=
I
OUT
<
=
1A
15 60
mV
V
OUT
/
V
IN
Line Regulation(*Note 2)
I
OUT
=100mA
V
OUT
+1V
<
=
V
IN
<
=
36V
0.05
0.10
%/V
I
RPT
Current Limit (Short mode)
(*Note 2)
V
OUT
=0V
50
mA
V
OUT
/
Topt
Output Voltage Temperature
Coefficient (*Note 2)
-40
C
<
=
Topt
<
=
125
C
50
ppm/
C
I
SINK1
EXT Output Sink Current Limit
V
IN
=12V,
V
OUT
=V
OUT
-0.2V
9 14 20 mA
I
SINK2
EXT Output Sink Current Limit
(Output short)
V
IN
=12V, V
OUT
=0V 0.20
0.50
0.85
mA
V
ISENSE
Current Limit Detector Threshold
0.23
0.30
0.37
V
RR Ripple
Rejection
V
IN
=
V
OUT
+1V,f
=
1kHz,
500mVp-p
55 dB
(Note2) Depending on the capability of an external PNP transistor. Use an hFE with approximately 100 to 300.
The output current does not always mean continuous current because of the limit of power dissipation of PNP
transistor.
VD part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
-V
DET
Detector
Threshold
*0.98 *1.02 V
V
HYS
Hysteresis
Range
(-V
DET
)
x0.01
(-V
DET
)
x0.02
(-V
DET
)
x0.03
V
-V
DET
/
Topt
Detector Threshold Temperature
Coefficient
-40C
<
=
Topt
<
=
125C
50
ppm/C
V
TCD
C
D
pin detector threshold
2.35
2.50
2.65
V
I
CD
Internal Current value for
Delay Time Setting
0.12
0.30
0.47
A
V
INL
Minimum Operating Voltage
V
OUT
pin voltage
2.0
V
R5104V
6
WDT part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
t
WD
Watchdog
Timeout
period C
TW
=
0.1
F
200 300 510 ms
t
WR
Reset Hold Time of WDT
C
TW
=
0.1
F
35 70 130 ms
V
IHSCK
SCK Input Voltage "H"
0.8
V
OUT
V
DD
+0.3
V
V
ILSCK
SCK Input Voltage "L"
0.0
0.1
V
-V
DET
>
=
3.0V 500
T
SCKW
SCK Input Pulse Width
-V
DET
<
=
2.9V 5000
ns
R5104VxxxB(Overall)
Topt
=
25
C
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
V
IN
Operating
Voltage
36 V
I
SS
Supply
Current
I
OUT
=
0mA
45 80
A
Ioff
Supply Current (Standby)
V
IN
=
12V, CE
=
0V
0.1
0.5
A
V
CEH
CE Input Voltage "H"
2.0
V
IN
+0.3
V
V
CEL
CE Input Voltage "L"
0.0
0.25
V
VR part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
V
OUT
Output
Voltage
0.98
1.02
V
I
OUT
Output Current(*Note 2)
V
IN
=
12V
1.0 A
V
DIF
Dropout Voltage(*Note 2)
I
OUT
=
300mA
50 mV
V
OUT
/
I
OUT
Load Regulation(*Note 2)
V
IN
=
12V
1mA
<
=
I
OUT
<
=
1A
15 60
mV
V
OUT
/
V
IN
Line Regulation(*Note 2)
I
OUT
=100mA
V
OUT
+1V
<
=
V
IN
<
=
36V
0.05
0.10
%/V
I
RPT
Current Limit (Short mode)
(*Note 2)
V
OUT
=0V
50
mA
V
OUT
/
Topt
Output Voltage Temperature
Coefficient (*Note 2)
-40
C
<
=
Topt
<
=
125
C
50
ppm/
C
I
SINK1
EXT Output Sink Current Limit
V
IN
=12V,
V
OUT
=V
OUT
-0.2V
9 14 20 mA
I
SINK2
EXT Output Sink Current Limit
(Output short)
V
IN
=12V, V
OUT
=0V 0.20
0.50
0.85
mA
V
ISENSE
Current Limit Detector Threshold
0.23
0.30
0.37
V
RR Ripple
Rejection
V
IN
=
V
OUT
+1V,f
=
1kHz,
500mVp-p
55 dB
(Note2) Depending on the capability of an external PNP transistor. Use an hFE with approximately 100 to 300.
The output current does not always mean continuous current because of the limit of power dissipation of PNP
transistor.
R5104V
7
VD part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
-V
DET
Detector
Threshold
*0.98 *1.02 V
V
HYS
Hysteresis
Range
(-V
DET
)
x0.01
(-V
DET
)
x0.02
(-V
DET
)
x0.03
V
-V
DET
/
Topt
Detector Threshold Temperature
Coefficient
-40C
<
=
Topt
<
=
125C
50
ppm/C
V
TCD
C
D
pin detector threshold
2.35
2.50
2.65
V
I
CD
Internal Current value for
Delay Time Setting
0.12
0.30
0.47
A
V
INL
Minimum Operating Voltage
V
OUT
pin voltage
2.0
V
WDT part
Symbol Item
Conditions
Min.
Typ.
Max.
Unit
t
WD
Watchdog
Timeout
period C
TW
=
0.1
F
200 300 510 ms
t
WR
Reset Hold Time of WDT
C
TW
=
0.1
F
35 70 130 ms
V
IHSCK
SCK Input Voltage "H"
0.8
V
OUT
V
DD
+0.3
V
V
ILSCK
SCK Input Voltage "L"
0.0
0.1
V
-V
DET
>
=
3.0V 500
T
SCKW
SCK Input Pulse Width
-V
DET
<
=
2.9V 5000
ns
R5104V
8
TIMING CHART
R5104VxxxA Series
TWD
TWR
V
DD
CTW
SCK
Vout
VrefH
VrefL
CE
RESET
tpLH
-
V
DET
C
D
VTC
D
+V
DET
tpHL
tpHL
tpLH
R5104V
9
R5104VxxxB Series
TWD
TWR
V
DD
CTW
SCK
Vout
VrefH
VrefL
CE
RESET
-
V
DET
C
D
VTC
D
+V
DET
tpHL
tpHL
tpLH
tpLH
tpLH
R5104V
10
OPERATION
R5104VxxxA Series (Watchdog Timer On/Off type)
The R5104VxxxA Series have the function that turns off the clock input of the watchdog timer. When the
watchdog timer is enabled (CE
=
"H"), the output of the internal regulator and SCK input pulse are supervised,
while the watchdog timer is disabled (CE
=
"L"), only the regulator is supervised.
R5104VxxxB Series (Standby Function)
Since the standby function is included in the R5104VxxxB Series, the consumption current of the system can
be reduced. The supply current at the standby mode is very small, typically 0.1A.
Output Delay Time Setting of the built-in voltage detector
The released delay time from reset of the voltage detector (tPLH) can be calculated with the external capacitor
value C
D
and the next formula.
tPLH = V
TCD
x C
D
/I
CD
(sec)
On the other hand, output delay time for detecting voltage (tPHL) is not specified, the time depends on the
capacitance value of C
D
.
TYPICAL APPLICATION
VDD
EXT
VOUT
ISENS
SCK
RESET
CE
CTW
C
D
GND
R
I
OUT
V
IN
C
CTW
C
D
Cout
C
IN
R5104V
11
TEST CIRCUITS
Standard Test Circuit
Test Circuit of Supply Current
V
DD
EXT
V
OUT
ISENSE
SCK
RESET
CE
CTW
CD
GND
R
I
OUT
V
IN
C
CTW
C
D
C
OUT
C
I
V
DD
EXT
V
OUT
ISENSE
SCK
RESET
CE
CTW
CD
GND
V
IN
C
CTW
C
OUT
A
Test Circuit of Standby Current
Test Circuit of EXT Sink Current
V
DD
EXT
V
OUT
ISENSE
SCK
RESET
CE
CTW
CD
GND
V
IN
C
CTW
C
OUT
A
V
DD
EXT
V
OUT
ISENSE
SCK
RESET
CE
CTW
CD
GND
V
IN
C
CTW
C
OUT
C
I
A
Vout
Test Circuit of Ripple Rejection
V
DD
EXT
V
OUT
ISENSE
SCK
RESET
CE
CTW
CD
GND
I
OUT
C
CTW
C
OUT
V
p
V
p
P.G.
V
IN
R5104V
12
TYPICAL CHARACTERISTICS
(Unless otherwise provided, V
IN
=I
SENSE
=CE=12V, C
IN
=0.1
F, C
OUT
=10
F, Ctw=0.1
F, CD=10nF, Ta=25
C)
1) Output Voltage vs. Output Current
V
OUT
=5.0V
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
500
1000
1500
2000
Output Current I
OUT
[mA]
O
u
t
put
V
o
lt
age V
OUT
[V]
6.0V
9.0V
12V
I
SENSE Resistance
=0 Ohm
V
OUT
=3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
500
1000
1500
2000
Output Current I
OUT
[mA]
O
u
t
put
V
o
lt
age V
OU
T
[V]
4.3V
9.0V
12V
I
SENSE
Resistance=0
Ohm
V
OUT
=5.0V
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
100
200
300
400
Output Current I
OUT
[mA]
O
u
t
put
V
o
lt
age V
OU
T
[V]
ISENSE Resistance
=1Ohm
V
OUT
=3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
100
200
300
400
Output Current I
OUT
[mA]
O
u
t
p
ut
V
o
lt
age V
OUT
[V]
I
SENSE Resistance
=1 ohm
2) Output Voltage vs. Input Voltage
5V Output type
3.3V Output type
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
30
40
50
Input Voltage V
IN
[V]
O
u
t
put
Volt
age V
OU
T
[V]
I
OUT
=100mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
10
20
30
40
50
Input Voltage V
IN
[V]
O
u
t
put
V
o
lt
age V
OUT
[V]
I
OUT
=100mA
R5104V
13
3) Output Voltage vs. Temperature
V
OUT
=5.0V
4.85
4.90
4.95
5.00
5.05
5.10
5.15
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
O
u
t
put
V
o
lt
age V
OU
T
[V]
I
OUT
=100mA
V
OUT
=3.3V
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
Ou
tp
u
t
Vo
lta
g
e
V
OUT
[V]
I
OUT
=100mA
4) Base Current Limit vs. Output Voltage
V
OUT
=5.0V
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
5
10
15
20
EXT Output Current I
SINK
[mA]
O
u
t
p
ut
V
o
lt
age V
OU
T
[V]
V
IN
=12V
VOUT=3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
5
10
15
20
EXT Output Current ISINK [mA]
Ou
tp
u
t
Vo
lta
g
e
V
O
UT [V]
V
IN
=12V
5) Ripple Rejection vs. Frequency
0
10
20
30
40
50
60
70
80
90
100
1000
10000
100000
FREQUENCY (Hz)
RIPPLE REJECTION RATIO (dB)
V
IN
=V
OUT
+1V, 500mVp-p
R5104V
14
6) Input
Transient
Response
VOUT=5.0V
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0
0.1
0.2
0.3
0.4
TIME (ms)
O
u
t
put
V
o
lt
age (V
)
-13
-8
-3
2
7
12
17
22
27
I
nput
V
o
lt
age (V
)
OUTPUT VOLTAGE
INPUT VOLTAGE
V
OUT
=3.3V
1.3
2.3
3.3
4.3
5.3
6.3
7.3
8.3
9.3
0
0.1
0.2
0.3
0.4
TIME (ms)
Ou
tp
u
t
Vo
lta
g
e
(V)
-14.7
-9.7
-4.7
0.3
5.3
10.3
15.3
20.3
25.3
INPUT VOL
T
AGE (
V
)
INPUT VOLTAGE
OUTPUT VOLTAGE
7) Load Transient Response
V
OUT
=5.0V
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0
0.1
0.2
0.3
0.4
TIME (ms)
O
u
t
put
V
o
lt
age (V
)
-25
0
25
50
75
100
125
O
u
t
put
Current
(mA
)
V
OUT
=3.3V
1.3
2.3
3.3
4.3
5.3
6.3
7.3
0
0.1
0.2
0.3
0.4
TIME (ms)
Ou
tp
u
t
Vo
lta
g
e
(V)
-25
0
25
50
75
100
125
Ou
tp
u
t
Cu
rre
n
t
(mA)
8) Detector Threshold vs. Temperature
4V Output Type
2.8V Output Type
3.85
3.90
3.95
4.00
4.05
4.10
4.15
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
Det
e
ct
or Threshold -V
DE
T
[V]
2.70
2.75
2.80
2.85
2.90
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
V
D
Det
e
ct
or Threshold -V
DE
T
[V]
R5104V
15
9) VD Output Delay Time Setting Current vs. Temperature 10) C
D
Pin Threshold vs. Temperature
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
O
u
t
put
Delay Time S
e
t
t
i
ng Current
I
CD
[
A]
2.40
2.45
2.50
2.55
2.60
2.65
2.70
2.75
2.80
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
Cd pin Threshold V
o
lt
age
CDTH [
V
]
11) CD Pin External Capacitance vs. Delay Time
12) WDT monitoring Time vs. Temperature (C
ctw=0.1
F)
0.001
0.01
0.1
1
10
100
1000
10000
0.001
0.01
0.1
External Capacitance (uF)
Ou
tp
u
t
De
la
y Time
fo
r Re
le
a
s
e
,
tPL
H
a
n
d
Re
se
t, tPHL
(ms)
tPHL
tPLH
200
220
240
260
280
300
320
340
360
380
400
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature Topt[
C]
W
D
T
monit
o
ring T
i
me
T
W
D [
m
s]
13) WDT Reset Time vs. Temperature(Cctw=0.1
F) 14)
External Capacitance vs. WDT monitoring/Reset Time
50
55
60
65
70
75
80
85
90
95
100
-40 -25 -10 5
20 35 50 65 80 95 110 125
Temperature Topt[
C]
WDT Reset Time
TWR [ms]
0.1
1
10
100
1000
10000
0.001
0.01
0.1
1
External Capacitance(uF)
Monitoring Time,TWD/Reset Time,
TWR(ms)
TWR
TWD
R5104V
16
15) Supply Current vs. Temperature
16) Supply Current vs. Input Voltage
0
20
40
60
80
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature Topt [
C]
Supply Current
I
ss [
u
A]
I
OUT
=0mA
V
OUT
=5.0V
0
20
40
60
80
100
120
0
10
20
30
40
50
Input Voltage V
IN
[V]
Supply Current
Iss [uA]
I
OUT
=0mA
17) Current limit detector threshold vs. Temperature 18) Nch Driver Output Current vs. V
DS
19) Nch Driver Output Current vs. V
DS
0.20
0.22
0.24
0.26
0.28
0.30
0.32
0.34
0.36
0.38
0.40
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature Topt[
C]
VI
SENSE[
V]
-VDET=3.4V
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VDS (V)
Output Current(mA
)
VOUT=3.4V
3.0V
2.5V
2.0V
-V
DET
=3.4V, RESET=0.05V
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.0
1.0
2.0
3.0
4.0
5.0
VGS (V)
O
u
t
put
Current
(mA
)
25C
-40
C
85C
125C
R5104V
17
TECHNICAL NOTES
The phase compensation is made with the phase compensation circuit in the IC and the ESR of the output
capacitor to make the operation stable. Therefore connect a 10
F or more value capacitor between V
OUT
and
GND. The ESR range of the output capacitor should be approximately 1
to 10
.
The fluctuation and the noise of the supply voltage, or a drastic change of the output voltage by the load
transition of the regulator might be the reason of the mis-operation of the watchdog timer. If the SCK input
pulse frequency is beyond 10kHz, or if the capacitance value of C
TW
pin is large, the watchdog timer is easily
affected by the fluctuation or noise of the supply voltage, or the fluctuation of the regulator output voltage, and
it may cause an unstable operation.
If V
IN
(supply voltage) may swing momentary, the regulator output is also swings. If the output of the voltage
regulator becomes lower than detector voltage threshold, the built-in detector may generate the reset signal.
Built-in over-current limit works as monitoring the sink current of EXT pin and limits the current. If an external
resistor between pin 1 and 2 is not connected, over-current limit does not work against the over-current of the
corrector caused by, for example, the short of EXT pin and GND externally.
Use a 100pF or more value capacitor for C
TW
pin.
Use a 10pF or more capacitor for C
D
pin. A capacitor must be connected to C
D
pin to use A version.
To avoid the mis-operation, during watchdog timer monitoring time, there is some ignoring time against clock
pulse. Therefore, during the ignoring time, input clock pulse (rising edge trigger) is ignored. The ignoring time
V
REF
2H is approximately as follows:
The time interval for C
TW
pin voltage from V
REF
2H to V
REF
2H
-
(V
REF
2H
-
V
REF
2L)/4
R5104V
18
SSOP-10
Unit: mm
PACKAGE DIMENSIONS
3.1
0.2
6.4
0.2
4.4
0.2
10
6
1
5
0.55TYP.
0.5
0.1 M
0.2
0.1
0.1
0.1
0.05
1.15
0.1
0.15
+0.1
-
0.05
0.5
0.2
0
10
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