MB3793-37PF [FUJITSU]
Power Voltage Monitoring IC with Watchdog Timer; 电源电压监控IC，具有看门狗定时器
| 型号： | MB3793-37PF |
| 厂家： | 
FUJITSU |
| 描述： | Power Voltage Monitoring IC with Watchdog Timer |
| 文件： | 总21页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27403-2E
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793-37A
■ DESCRIPTION
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer.
A reset signal is output when the power is cut or falls abruptly. When the power recovers normally after resetting,
a power-on reset signal is output to microprocessor units (MPUs). An internal watchdog timer with two inputs for
system operation diagnosis can provide a fall-safe function for various applicaiton systems.
There is also a mask option that can detect voltages of 4.9 to 2.4 V in 0.1-V steps.
The model number is MB3793-37A corresponding to the detected voltage. The model number and package code
are as shown below.
Model No.
Package code
Detection voltage
MB3793-37A
3793AF
3.7 V
■ FEATURES
• Precise detection of power voltage fall: ±2.5%
• Detection voltage with hysteresis
• Low power dispersion: ICC = 30 µA (reference)
• Internal dual-input watchdog timer
• Watchdog-timer halt function (by inhibition pin)
• Independently-set wacthdog and reset times
■ PACKAGE
8-pin, Plastic SOP
8-pin, Plastic SOL
(FPT-8P-M01)
(FPT-8P-M02)
MB3793-37A
■ PIN ASSIGNMENT
(Top view)
1
2
3
4
8
7
6
5
CK1
CK2
INH
VCC
RESET
CTW
CTP
GND
(FPT-8P-M01)
(FPT-8P-M02)
■ PIN DESCRIPTION
Pin no. Symbol
Descriptions
Pin no. Symbol
Descriptions
Power supply pin
1
2
RESET Outputs reset pin
5
6
VCC
Watchdog timer monitor time
setting pin
CTW
INH
Inhibit pin
Power-on reset hold time
setting pin
3
4
CTP
7
8
CK2
CK1
Inputs clock 2 pin
Inputs clock 1 pin
GND
Ground pin
2
MB3793-37A
■ BLOCK DIAGRAM
5
To VCC of all blocks
VCC
.
.
I1 = 3 µA
I2 = 30 µA
.
.
CTP
3
1
.
R1 =
.
494 kΩ
Logic circuit
RESET
Output circuit
INH
6
Comp.S
−
VS
Reference
voltage
generator
CTW
CK1
2
8
Watchdog
timer
+
Pulse generator 1
.
VREF = 1.24 V
.
.
R2 =
.
240 kΩ
Pulse generator 2
To GND of
all blocks
7
CK2
4
GND
3
MB3793-37A
■ BLOCK DESCRIPTION
1. Comp. S
Comp. S is a comparator with hysteresis to compare the reference voltage with a voltage (VS) that is the result of
dividing the power voltage (VCC) by resistors 1 and 2. When VS falls below 1.24 V, a reset signal is output.
This function enables the MB3793 to detect ans abnomality within 1 µs when the power is cut or falls abruptly.
2. Output circuit
The output circuit contains a RESET output control comparator that compares the voltage at the CTP pin to the
threshold voltage to release the RESET output if the CTP pin voltage exceeds the threshold value.
Since the reset (RESET) output buffer has CMOS organization, no pull-up resistor is needed.
3. Pulse generator
The pulse generator generates pulses when the voltage at the CK1 and CK2 clock pins changes to High from Low
level (positive-edge trigger) and exceeds the threshold voltage; it sends the clock signal to the watchdog timer.
4. Watchdog timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single
clock pulse.
5. Inhibition pin
The inhibition (INH) pin forces the watchdog timer on/off. When this pin is High level, the watchdog timer is stopped.
6. Logic circuit
The logic circuit contains flip-flops.
Flip-flop RSFF1 controls the charging and discharging of the power-on reset time setting capacitor (CTP).
Flip-flop RSFF2 turns on/off the circuit that accelerates charging of the power-on reset time setting capacitor
(CTP) at a reset. The RSFF2 operates only at a reset; it does not operate at a power-on reset when the power is
turned on.
4
MB3793-37A
■ ABSOLUTE MAXIMUM RATINGS
(Ta = +25°C)
Rating
Parameter
Symbol
Conditions
Unit
Min.
Max.
Power supply voltage*
VCC
VCK1
VCK2
IINH
—
—
—
—
–0.3
+7
V
V
CK1
CK2
INH
Input voltage
–0.3
–10
+7
IOL
IOH
Reset output current
RESET
—
+10
mA
Allowable loss
PD
Ta ≤ +85°C
—
200
mW
Storage temperature
Tstg
—
–55
+125
°C
* : The power supply voltage is based on the ground voltage (0 V).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
■ RECOMMENDED OPERATING CONDITIONS
Value
Parameter
Symbol
Conditions
Unit
Min.
Typ.
Max.
Power supply voltage
VCC
—
—
1.2
—
6.0
V
IOL
IOH
Reset (RESET) output current
–5
—
—
+5
10
mA
Power-on reset hold time setting
capacity
CTP
—
0.001
µF
Watchdog-timer monitoring time
setting capacity
CTW
Ta
—
—
0.001
–40
—
—
1
µF
°C
Operating temperature
+85
* : The watchdog timer monitor time range depends on the rating of the setting capacitor.
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device's electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
5
MB3793-37A
■ ELECTRICAL CHARACTERISTICS
1. DC Characteristics
(VCC = +5 V, Ta = +25°C)
Value
Unit
Parameter
Symbol
ICC1
Conditions
Min.
—
Typ.
Max.
Power supply current
After exit from reset
30
50
µA
Ta = +25°C
3.60
3.70
3.70
3.79
3.79
3.80
VSL
VCC falling
V
Ta = –40°C to +85°C (3.55)*
Ta = +25°C 3.69
(3.85)*
3.89
Detection voltage
VSH
VCC rising
VSH – VSL
V
Ta = –40°C to +85°C (3.64)*
(3.94)*
Detection voltage hysteresis
difference
VSHYS
40
85
130
mV
VCIH
VCIL
VCHTS
VIIH
VIIL
CK rising
CK falling
(1.4)*
0.8
1.9
1.3
0.6
—
2.5
(1.8)*
(0.8)*
—
V
V
V
Clock-input threshold voltage
Clock-input hysteresis
—
—
—
(0.4)*
3.5
—
Inhibition-input voltage
V
0
0.8
IIH
VCK = 5 V
—
0
1.0
µA
µA
V
Input current
(CK1, CK2, INH)
IIL
VCK = 0 V
–1.0
4.5
—
0
—
VOH
VOL
IRESET = –5 mA
IRESET = +5 mA
4.75
0.12
—
Reset output voltage
0.4
V
Reset-output minimum
power voltage
VCCL
IRESET = +50 µA
—
0.8
1.2
V
* : The values enclosed in parentheses ( ) are setting assurance values.
2. AC Characteristics
(VCC = +5 V, Ta = +25°C)
Value
Parameter
Symbol
Conditions
Unit
Min.
Typ.
130
—
Max.
180
Power-on reset hold time
VCC input pulse width
VCC delay time
tPR
tPI
CTP = 0.1 µF
CTP = 0.1 µF
CTP = 0.1 µF
80
(110)*2
—
ms
µs
µs
—
(100)*2
tPD
20
CTW = 0.01 µF,
CTP = 0.1 µF
Watchdog timer reset time
tWD
7.5
15
22.5
ms
Watchdog timer reset time
Clock input pulse width
Clock input pulse cycle
tWR
tCKW
tCKT
tr*1
CTP = 0.1 µF
—
5
500
20
—
10
—
—
—
—
15
—
ms
ns
µs
ns
ns
—
—
Rising
Falling
CL = 50 pF
CL = 50 pF
500
500
Reset (RESET) output transition
time*1
tf*2
—
*1:The voltage range is 10% to 90% at testing the reset output transition time.
*2:The values enclosed in parentheses ( ) are setting assurance values.
6
MB3793-37A
■ DIAGRAM
1. Basic operation (Positive clock pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
RESET
tPR
tWD
tPR
tWR
(1) (2) (3) (4)(5) (5)
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
7
MB3793-37A
2. Basic operation (Negative clock pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
RESET
tPR
tWD
tPR
tWR
(1) (2) (3) (4)(5) (5)
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
8
MB3793-37A
3. Single-clock input monitoring (Positive clock pulse)
tCKW
CK1
CK2
tCKT
Vth
CTP
VH
VL
CTW
RESET
tWD
tWR
Note: The MB3793 can monitor only one clock.
The MB3793 checks the clock signal at every other input pulse. Therefore, set watchdog timer
monitor time tWD to the time that allows the MB3793 to monitor the period twice as long as the input
clock pulse.
9
MB3793-37A
4. Inhibition operation (Positive clock pulse)
VSH
VSL
VCC
tCKW
CK1
CK2
INH
Vth
CTP
VH
CTW
VL
RESET
tPR
tWD
tPR
tWR
(1) (2) (3) (4)(5) (5)
(6) (7) (11) (8) (9)
(10)
(12)
(13)
10
MB3793-37A
5. Clock pulse input supplementation (Positive clock pulse)
*1
CK1
*2
CK2
VH
CTW
VL
Note: The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (CTW) switches to
charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.
■ OPERATION SEQUENCE
1. Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “■ DIAGRAM.”
2. Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “■ DIAGRAM.”
The MB3793 operates in the same way whether it inputs positive or negative pulses.
3. Clock monitoring
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock
signal at every other input pulse.
See “3. Single-clock input monitoring (positive clock pulse)” under “■ DIAGRAM.”
4. Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “■ DIAGRAM.”
(1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL)
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on
reset hold time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is about
3.79 V.
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the threshold
voltage (Vth) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to “H” level
from “L” level).
11
MB3793-37A
The Vth value is about 3.6 V with VCC = 5.0 V
The power-on reset hold timer monitor time tPR is set with the following equation:
.
tPR (ms) = A × CTP (µF)
.
The value of A is about 1300 with VCC = 5.0 V. The MB3793 also starts charging the watchdog timer monitor
time setting capacitor (CTW).
(4) When the voltage at the watchdog timer monitor time setting pin CTW reaches the “H” level threshold voltage
VH, the CTW switches from the charge state to the discharge state.
The value of VH is always about 1.24 V regardless of the detected voltage.
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the CTW is being discharged in the CK1-CK2
order or simultaneously, the CTW switches from the discharge state to the charge state.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system
logic circuit operating normally.
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time tWD due to some problem
with the system logic circuit, the CTW pin is set to the “L” level threshold voltage VL or less and the MB3793
outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of VL is always about 0.24 V regardless of the detected voltage.
The watchdog timer monitor time tWD is set with the following equation:
.
tWD (ms) = B × CTW (µF)
.
The value of B is hardly affected by the supply voltage; it is about 1500 with VCC = 5.0 V.
(7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds Vth again after
recharging the CTP), the MB3793 cancels the reset signal and starts operating the watchdog timer.
The watchdog timer monitor reset time tWR is set with the following equation:
.
tWR (ms) = D x CTP (µF)
.
The value of D is about 100 with VCC = 5.0 V.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock
pulse is input, the MB3793 repeats operations (6) and (7).
(8) If VCC is lowered to the fall-time detected voltage (VSL) or less, the CTP pin voltage decreases and the
MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of VSL is 3.7 V
(9) When VCC reaches or exceeds VSH again, the MB3793 starts charging the CTP.
(10) When the CTP pin voltage reaches or exceeds Vth, the MB3793 cancels the reset and restarts operating
the watchdog timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
(11) Making the inhibit pin active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop operation.
This stops only the watchdog timer, leaving the MB3793 monitoring VCC (operations (8) to (10)).
The watchdog timer remains inactive unless the inhibit input is canceled.
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set VCC to VSL or less.
12
MB3793-37A
■ TYPICAL CHARACTERISTICS
Power supply current-Power supply voltage
Detection voltage-Ambient temperature
40
4.0
3.9
Ta = −40°C to +85°C
35
30
VSH (Ta = +25°C)
MAX
25
Watchdog timer monitoring
(VINH = 0 V)
MAX
20
3.8
3.7
VSH
TYP
MIN
15
10
TYP
MIN
VSL
MB3793-37A
VINH VCC
3.6
3.5
f = 1 kHz
Duty = 10%
VL = 0 V
VSL (Ta = +25°C)
CTP
CTW
0.1 µF
0.01 µF
VH = VCC
(Ta = −40°C to +85°C)
20 40 60 80 100
−40 −20
0
0
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10
Power supply voltage: VCC (V)
Ambient temperature: Ta (°C)
Reset output voltage-Reset output current
(P-MOS side)
Reset output voltage-Reset output current
(N-MOS side)
Ta
VRESET
RON
IRESET
500
400
300
200
5.0
−40°C
+25°C
+85°C
98 mV 19.6 Ω
135 mV 27 Ω
167 mV 33.4 Ω
Ta = −40°C
+5 mA
4.9
Ta = +25°C
4.8
4.7
4.6
4.5
Ta = +25°C
Ta = +85°C
Ta = +85°C
4.4
Ta
VRESET
RON
IRESET
4.3
4.2
−40°C
+25°C
+85°C
4.800 V 40 Ω
4.750 V 50 Ω
4.707 V 58.6 Ω
−5 mA
100
0
Ta = −40°C
4.1
4.0
0
−1 −2 −3 −4 −5 −6 −7 −8 −9 −10
0
1
2
3
4
5
6
7
8
9
10
Reset output current: IRESET (mA)
Reset output current: IRESET (mA)
(Continued)
13
MB3793-37A
Reset-on reset time-Ambient temperature
(when VCC rising)
260
Reset output voltage-Power supply voltage
7
6
5
Pull-up resistance: 100 kΩ
240
Ta = −40°C to +85°C
220
200
Ta = +25°C
180
4
3
MAX
160
140
Ta = +85°C
120
2
1
0
TYP
Ta = +25°C
Ta = −40°C
100
80
MIN
60
40
20
0
0
1
2
3
4
5
6
7
Power supply voltage: VCC (V)
−40 −20
0
20 40 60 80 100
Ambient temperature: Ta (°C)
Watchdog timer reset time-Ambient
temperature (when monitoring)
Watchdog timer monitoring time-Ambient
temperature
26
26
Ta = −40°C to +85°C
24
22
24
MAX
Ta = −40°C to +85°C
22
20
18
16
14
12
10
8
20
Ta = +25°C
18
16
Ta = +25°C
TYP
MAX
14
12
10
TYP
MIN
8
6
4
2
0
MIN
6
4
2
0
−40 −20
0
20 40 60 80 100
−40 −20
0
20 40 60 80 100
Ambient temperature: Ta (°C)
Ambient temperature: Ta (°C)
(Continued)
14
MB3793-37A
(Continued)
Power-on reset time-CTP capacitance
Reset time-CTP capacitance
103
102
101
104
103
102
101
Ta = −40°C
Ta = +25°C
Ta = −40°C
1
10−1
10−2
Ta = +25°C
Ta = +85°C
Ta = +85°C
1
10 −1
10−4 10−3 10−2 10−1
10−4 10−3 10−2 10−1
1
101
102
1
101
102
Power-on reset time setting capacitance: CTP (µF)
Power-on reset time setting capacitance: CTP (µF)
Watchdog-timer monitoring time-CTW capacitance
103
Ta = −40°C
102
Ta = +25°C
101
1
Ta = +85°C
10−1
10−5 10−4 10−3 10−2 10−1
1
101
Watchdog-timer monitoring time
setting capacitance: CTW (µF)
15
MB3793-37A
■ APPLICATION EXAMPLE
1. Supply voltage monitor and watchdog timer (1-clock monitor)
VCC
5
VCC
2
CTW
RESET
1
M B 3 7 9 3
RESET
VCC
CTP
INH
CK1
CK2
3
6
8
7
CTW*
CTP*
Microprocessor
CK
GND
4
GND
GND
* : Use a capacitor with less leakage current.
The MB3793 monitors the clock (CK1/2) at every other input pulse.
2. Supply voltage monitor and watchdog timer stop
VCC
5
VCC
6
INH
RESET 1
RESET
VCC
RESET
VCC
M B 3 7 9 3
Microprocessor 1
Microprocessor 2
2
3
HALT
GND
CTW
CTP
CK1
CK
8
CK
HALT
GND
CTW*
CTP*
GND
4
CK2 7
GND
* : Use a capacitor with less leakage current.
16
MB3793-37A
■ TYPICAL APPLICATION
VCC
5
VCC
2
1
CTW
RESET
RESET
VCC
RESET
VCC
MB3793
Microprocessor 1
Microprocessor 2
CTW*
CTP*
3
6
8
7
CTP
INH
CK1
CK
CK
GND
GND
GND CK2
4
GND
* : Use a capacitor with less leakage current.
1. Equation of time-setting capacitances (CTP and CTW) and set time
.
=
tPR [ms]
tWD [ms]
A × CTP [µF]
.
.
=
B × CTW [µF] + C × CTP [µF]
.
.
CTP
=
However, when
tWD [ms]
B × CTW [µF]
.
≤ about 10,
CTW
.
=
tWR [ms]
D × CTP [µF]
.
Values of A, B, C, and D
A
B
C
D
Remark
1300
1500
0
100
VCC = 5.0 V
2. (Example) when CTP = 0.1 µF and CTW = 0.01 µF
.
tPR
=
130
15
.
time
.
=
tWD
.
(msec)
.
=
tWR
10
.
17
MB3793-37A
■ ORDERING INFORMATION
Part number
Package
Remarks
MB3793-37PF
8-pin Plastic SOP
(FPT-8P-M01)
MB3793-37PNF
8-pin Plastic SOL
(FPT-8P-M02)
18
MB3793-37A
■ PACKAGE DIMENSIONS
8-pin Plastic SOP
(FPT-8P-M01)
2.25(.089)MAX
(Mounting height)
6.35 +–00..2205 .250 –+..000180
0.05(.002)MIN
(STAND OFF)
6.80 –+00..2400
5.30±0.30
(.209±.012) (.307±.016)
7.80±0.40
INDEX
.268 +–..000186
1.27(.050)
TYP
0.45±0.10
(.018±.004)
0.15 –+00..0025
0.50±0.20
(.020±.008)
M
Ø0.13(.005)
.006 +–..000012
3.81(.150)REF
Details of "A" part
0.20(.008)
0.50(.020)
0.18(.007)MAX
"A"
0.68(.027)MAX
0.10(.004)
C
Dimensions in mm (inches)
(Continued)
1994 FUJITSU LIMITED F08002S-4C-4
19
MB3793-37A
(Continued)
8-pin Plastic SOL
(FPT-8P-M02)
5.05 +–00..2205 .199 –+..000180
1.55±0.20(.061±.008)
(Mounting height)
0.15±0.10
(.006±.004)
(STAND OFF)
3.90±0.30
(.154±.012)
6.00±0.40
(.236±.016)
5.00±0.30
(.197±.012)
45°
0.40(.016)
1.27(.050)TYP
0.42±0.10
(.017±.004)
0.20±0.05
(.008±.002)
0.50±.020
(.020±.008)
M
Ø0.13(.005)
Details of "A" part
0.40(.016)
"A"
0.10(.004)
0.20(.008)
0.18(.007)MAX
3.81(.150)REF
0.65(.026)MAX
C
1994 FUJITSU LIMITED F08004S-2C-4
Dimensions in mm (inches)
20
MB3793-37A
FUJITSU LIMITED
For further information please contact:
Japan
FUJITSU LIMITED
Corporate Global Business Support Division
Electronic Devices
KAWASAKI PLANT, 4-1-1, Kamikodanaka
Nakahara-ku, Kawasaki-shi
Kanagawa 211-8588, Japan
Tel: 81(44) 754-3763
All Rights Reserved.
The contents of this document are subject to change without
notice. Customers are advised to consult with FUJITSU sales
representatives before ordering.
Fax: 81(44) 754-3329
http://www.fujitsu.co.jp/
The information and circuit diagrams in this document are
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F9901
FUJITSU LIMITED Printed in Japan
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相关型号：
MB3793-42PF-XXXE1
Power Supply Management Circuit, Fixed, 1 Channel, BIPolar, PDSO8, 5.30 X 6.35 MM, 2.25 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, PLASTIC, SOP-8
CYPRESS
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