MB3793-42 [FUJITSU]
POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER; 电源电压监控IC与看门狗定时器
| 型号： | MB3793-42 |
| 厂家： | 
FUJITSU |
| 描述： | POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER |
| 文件： | 总20页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27402-2E
ASSP
POWER-VOLTAGE MONITORING
IC WITH WATCHDOG TIMER
MB3793-42/30
DESCRIPTION
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog
timer.
8-PIN PLASTIC DIP
(DIP-8P-M01)
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
fail-safe function for various application systems.
Two models with detection voltages of 4.2 and 3.0 V are available. There is also a mask
option that can detect voltages of 4.9 to 3.0 V in 0.1-V steps.
The model numbers are MB3793-42 or -30 corresponding to the detected voltage. The
model number and package code are as shown below.
Model No.
MB3793-42
MB3793-30
Package code
3793-A
Detection voltage
4.2 V
3.0 V
3793-N
8-PIN PLASTIC SOL
(FPT-8P-M02)
FEATURES
•
•
•
•
•
•
•
Precise detection of power voltage fall: ±2.5%
Detection voltage with hysteresis
Low power dispersion: ICC = 27 µA (reference)
Internal dual-input watchdog timer
Watchdog-timer halt function (by inhibition pin)
Independently-set watchdog and reset times
Mask option for detection voltage (4.9 to 3.0 V, 0.1-V steps)
This device contains circuitry to protect the inputs against
damage due to high static voltages or electric fields. However,
it is advised that normal precautions be taken to avoid
application of any voltage higher than maximum rated voltages
to this high impedance circuit.
1
MB3793-42/30
■ PIN ASSIGNMENT
(TOP VIEW)
1
2
3
4
8
7
6
5
CK1
CK2
INH
VCC
RESET
CTW
CTP
GND
(DIP-8P-M01)
(FPT-8P-M02)
■ PIN DESCRIPTION
Pin No.
Symbol
RESET
CTW
Description
Outputs reset
Pin No. Symbol
Description
1
2
3
4
5
6
7
8
VCC
INH
CK2
CK1
Power supply
Sets monitoring time
Sets power-on reset hold time
Ground
Inhibits watchdog timer function
Inputs clock 2
CTP
GND
Inputs clock 1
2
MB3793-42/30
■ BLOCK DIAGRAM
(5)
To VCC of all blocks
VCC
I1 ≈ 3µA
I2 ≈ 30µA
Q
S
CTP (3)
RSFF2
R1 ≈ 280 to
760 kΩ
R
S
Q
Q
Comp. O
Output buffer
+
-
RESET
(1)
RSFF1
R
Q
INH (6)
CTW(2)
Comp. S
Reference
voltage
-
VS
Watchdog timer
generator
+
Pulse generator 1
VREF ≈ 1.24 V
(8)
CK1
R1 ≈ 240 kΩ
Pulse generator 2
CK2(7)
To GND of all blocks
(4) GND
3
MB3793-42/30
■ BLOCK FUNCTIONS
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 an abnormality
within 1 µs when the power is cut or falls abruptly.
2. Comp. O
Comp. O is a comparator to control the reset signal (RESET) output and compares the threshold voltage with the voltage at the CTP pin for
setting the power-on reset hold time. When the voltage at the CTP pin exceeds the threshold voltage, resetting is canceled.
3. Reset output buffer
Since the reset (RESET) output buffer has CMOS organization, no pull-up resistor is needed.
4. 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.
5. Watchdog timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse.
6. Inhibition pin
The inhibition (INH) pin forces the watchdog timer on/off. When this pin is High level, the watchdog timer is stopped.
7. Flip-flop circuit
The flip-flop circuit RSFF1 controls charging and discharging of the power-on reset hold time setting capacity (CTP). The flip-flop circuit RSFF2
switches the charging accelerator for charging CTP during resetting on/off. This circuit only functions during resetting and does not function at
power-on reset.
4
MB3793-42/30
■ STANDARD CONNECTION
VCC
VCC
MB3793
GND
RESET
CTW
RESET
VCC
VCC
RESET
Microprocessor 1
CK
CTP
Microprocessor 2
CK
CK1
CK2
CTW
CTP
GND
GND
INH
Equation of time-setting capacitances (CTP and CTW) and set time
tPR (ms) ≈ A x CTP (µF)
tWD (ms) ≈ B x CTW (µF) + C x CTP (µF)
CTP
However, when —— ≤ about 10,
CTW
tWD (ms) ≈ B x CTW (µF)
tWR (ms) ≈ D x CTP (µF)
Values of A, B, C, and D
Model No.
MB3793-42
MB3793-30
A
B
C
3
4
D
Remark
1300
750
1500
1600
100
55
(Example) When CTP = 0.1 µF and CTW = 0.01 µF,
• MB3793-42
tPR ≈ 130 [ms]
tWD ≈ 15 [ms]
tWR ≈ 10 [ms]
• MB3793-30
tPR ≈ 75 [ms]
tWD ≈ 16 [ms]
tWR ≈ 5.5 [ms]
5
MB3793-42/30
■ TIMING CHART
1. Basic operation (Positive clock pulse)
VSH
VSL
VCC
VCCL
tCKW
CK1
CK2
INH
Vth
CTP
VH
CTW
VL
tPR
tWD
tPR
RESET
tWR
(1) (2)
(3)(4) (5) (5)
(6) (7)
(8) (9)
(10)
(11)
(12)
(13) (14)
6
MB3793-42/30
2. Basic operation (Negative clock pulse)
VSH
VCCVSL
VCCL
tCKW
CK1
CK2
INH
Vth
CTP
VH
CTW
VL
tPR
tWD
tPR
RESET
tWR
(1) (2)
(3)(4) (5) (5)
(6) (7)
(8) (9)
(10)
(11)
(12)
(13) (14)
7
MB3793-42/30
3. Single-clock input monitoring (Positive clock pulse)
CK1
CK2
Vth
CTP
VH
CTW
VL
RESET
tWR
8
MB3793-42/30
4. Inhibition operation (Positive clock pulse)
VSH
VCC VSL
VCCL
tCKW
CK1
CK2
INH
Vth
CTP
VH
CTW
VL
tPR
tWD
tPR
RESET
tWR
(1) (2)
(3)(4) (5) (5)
(6) (7) (8) (9) (10) (11)
(12)
(13) (14)
9
MB3793-42/30
5. Clock pulse input (Positive clock pulse)
a
CK1
b
CK2
VH
CTW
VL
The MB3793 watchdog timer monitors Clock 1 (CK1) and Clock 2 (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, pulses a and b are ignored.
■ OPERATION SEQUENCE
The operation sequence is explained by using Timing Chart 1.
The following item numbers correspond to the numbers in Timing Chart 1.
(1) When the power voltage (VCC) reaches about 0.8 V (VCCL), a reset signal is output.
(2) When VCC exceeds the rising-edge detection voltage (VSH), charging of power-on reset hold time setting capacitance (CTP) is started.
VSH is about 4.3 V in the MB3793-42 and 3. 07 V in the MB3793-30.
(3) When the voltage at the CTP pin setting the power-on reset hold time exceeds the threshold voltage (Vth), resetting is canceled and
the voltage at the RESET pin changes to High level to start charging of the watchdog-timer monitoring time setting capacitance (CTW).
Vth is about 3.6 V in the MB3793-42 and 2.4 V in the MB3793-30.
The power-on reset hold time (tPR) can be calculated by the following equation.
tPR (ms) ≈ A x CTP (µF)
Where, A is about 1300 in the MB3793-42 and 750 in the MB3793-30.
(4) When the voltage at the CTW pin setting the monitoring time reaches High level (VH), CTW switches to discharging from charging. VH
is about 1.24 V (reference value) in both the MB3793-42 and MB3793-30.
(5) When clock pulses are input to the CK2 pin during CTW discharging after clock pulses are input to the CK1 pin—positive-edge trigger,
CTW switches to charging.
(6) If clock pulse input does not occur at either the CK1 or CK2 clock pins during the watchdog-timer monitoring time (tWD), the CTW voltage
falls below Low level (VL), a reset signal is output, and the voltage at the RESET pin changes to Low level. VL is about 0.24 V in both
the MB3793-42 and MB3793-30.
tWD can be calculated from the following equation.
tWD (ms) ≈ B x CTW (µF) + C x CTP (µF)
Where, B is about 1500 in the MB3793-42 and 1600 in the MB3793-30. C is about 3 in the MB3793-42 and 4 in the MB3793-30; it is
much smaller than B.
CTP
Hence, when —— ≤ 10, the calculation can be simplified as follows:
CTW
tWD (ms) ≈ B x CTW (µF)
10
MB3793-42/30
(7) When the voltage of the CTP pin exceeds Vth again as a result of recharging CTP, resetting is canceled and the watchdog timer restarts
monitoring.
The watchdog timer reset time (tWR) can be calculated by the following equation.
tWR (ms) ≈ D x CTP (µF)
Where, D is about 100 in the MB3793-42 and 55 in the MB3793-30.
(8) When VCC falls below the rising-edge detection voltage (VSL), the voltage of the CTP pin falls and a reset signal is output, and the
voltage at the RESET pin changes to Low level. VSL is about 4.2 V in the MB3793-42 and 3.0 V in the MB3793-30.
(9) When VCC exceeds VSH, CTP begins charging.
(10) When the voltage of the CTP pin exceeds Vth, resetting is canceled and the watchdog timer restarts.
(11) When an inhibition signal is input (INH pin is High level), the watchdog timer is halted forcibly.
In this case, VCC monitoring is continued ((8) - (9)) without the watchdog timer.
The watchdog timer does not function unless this inhibition input is canceled.
(12) When the inhibition input is canceled (INH pin is Low level), the watchdog timer restarts.
(13) When the VCC voltage falls below VSL after power-off, a reset signal is output.
Similar operation is also performed for negative clock-pulse input (Timing Chart 2).
Short-circuit the clock pins CK1 and CK2 to monitor a single clock. The basic operation is the same but the clock pulses are monitored at every
other pulse (Timing Chart 3).
■ ABSOLUTE MAXIMUM RATINGS
(Ta = +25°C)
Parameter
Symbol
VCC
LImits
Symbo
Power voltage*
Input voltage
-0.3 to +7
V
CK1
CK2
INH
VCK1
VCK2
VINH
-0.3 to +7
-10 to +10
V
Reset output voltage
(direct current)
IOL
IOH
RESET
mA
Allowable loss (Ta ≤ +85°C)
PD
200
mW
Storage temperature
Tstg
-55 to +125
°C
*The power voltage is based on the ground voltage (0 V).
Note: Permanent device damage may occur if the above ABSOLUTE MAXIMUM RATINGS are exceeded. Functional operation should be
restricted to the conditions as detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
■ RECOMMENDED OPERATING CONDITIONS
Limits
Parameter
Symbol
Unit
Min.
Typical
Max.
IOL
IOH
Reset (RESET) output current
-5
-
+5
mA
Power-on reset hold time setting capacity
Watchdog-timer monitoring time setting capacity
Watchdog timer monitoring time
CTP
CTW
tWD
Ta
0.001
0.001
0.1
-
-
-
-
10
1
µF
µF
ms
°C
1500
+85
Operating ambient temperature
-40
Note: These recommended operation conditions guarantee normal logic operation of an LSI circuit. The limits of the AC and DC electrical
characteristics are guaranteed within these recommended conditions.
11
MB3793-42/30
■ ELECTRICAL CHARACTERISTICS
1. DC Characteristics
(VCC = +5 V (MB3793-42), VCC = +3.3 V (MB3793-30), Ta = +25°C)
Limits
Parameter
Symbol
Test Conditions
Unit
µA
µA
V
Min.
-
Typical
27
Max.
50
ICC1
ICC2
ICC1
ICC2
Watchdog timer operation*
Watchdog timer halt**
MB3793-42
MB3793-30
-
25
45
Power current
Watchdog timer operation*
Watchdog timer halt**
-
25
45
-
24
45
Ta = +25°C
4.10
4.05
4.20
4.15
2.90
2.85
2.97
2.92
50
4.20
4.20
4.30
4.30
3.00
3.00
3.07
3.07
100
70
4.30
4.35
4.40
4.45
3.10
3.15
3.17
3.22
150
110
(2.5)
(1.8)
(0.8)
2.0
VSL
VCC falling
Ta = -40 to +85°C
MB3793-42
MB3793-30
Ta = +25°C
VSH
VSL
VCC rising
VCC falling
VCC rising
VSH - VSL
V
Ta = -40 to +85°C
Ta = +25°C
Detection voltage
V
Ta = -40 to +85°C
Ta = +25°C
VSH
VSHYS
V
Ta = -40 to +85°C
Detection voltage
hysteresis difference
MB3793-42
MB3793-30
mV
mV
V
30
VthCH
VthCL
VCHYS
VthIN
IIH
-
-
-
-
(1.4)
(0.8)
(0.4)
0.8
-
1.9
Clock-input threshold voltage
1.3
V
Clock-input hysteresis
Inhibition-input threshold voltage
CK1
0.6
V
1.5
V
VCK = VCC
VCK = 0 V
0
1.0
µA
µA
V
Input current
CK2
INH
IIL
-1.0
4.5
-
0
-
VOH
VOL
IRESET = -5 mA
IRESET = +5 mA
IRESET = -3 mA
IRESET = +3 mA
IRESET = +50 µA
4.75
0.12
3.10
0.12
0.8
-
MB3793-42
MB3793-30
0.4
V
Reset output voltage
VOH
VOL
2.8
-
-
V
0.4
V
Reset-output minimum power voltage
VCCL
-
1.2
V
*At clock input pins CK1 and CK2, the pulse input frequency is 1 kHz and the pulse amplitude is 0 V to VCC.
**Inhibition input is at High level.
12
MB3793-42/30
2. AC Characteristics
(VCC = +5 V (MB3793-42), VCC = +3.3 V (MB3793-30), Ta = +25°C)
Limits
Parameter
Power-on reset hold time
Symbol
tPR
Test Conditions
Unit
Min.
80
30
7.5
8
Typical
Max.
180
120
22.5
24
MB3793-42
MB3793-30
MB3793-42
MB3793-30
MB3793-42
MB3793-42
130
75
15
16
10
5.5
-
ms
ms
ms
ms
ms
ms
ns
CTP = 0.1 µF
CTW = 0.01 µF
CTP = 0.1 µF
Watchdog timer monitoring time
Watchdog timer reset time
tWD
5
15
tWR
CTP = 0.1 µF
2.0
500
-
9
Clock (CK1, CK2) input pulse duration
tCKW
tTLH
tTHL
-
CL = 50pF
CL = 50pF
-
Rising
Falling
-
500
500
ns
Reset (RESET) output transition
time*
-
-
ns
*The voltage range is 10% to 90% at testing the reset output transition time.
■ WATCHDOG TIMER USE EXAMPLE
1. Monitoring Two Clocks
VCC
(5)
VCC
(1)
RESET
(2) CTW
(3) CTP
VCC
VCC
RESET
RESET
Microprocessor 1
CK
Microprocessor 2
CK
MB3793
CK1 (8)
CK2 (7)
CTW
CTP
GND
GND
INH
(6)
GND
(4)
13
MB3793-42/30
2. Monitoring Single Clock
VCC
(5)
VCC
RESET (1)
(2) CTW
(3) CTP
RESET
VCC
Microprocessor
CK
MB3793
(8)
CK1
CTW
CTP
GND
(7)
CK2
INH
(6)
GND
(4)
3. Watchdog Timer Stopping
VCC
(5)
VCC
RESET
INH
(6)
(2)
(3)
(1)
CTW
CTP
VCC
VCC
RESET
RESET
Microprocessor 1
Microprocessor 2
MB3793
(8)
(7)
CK
CK
CK1
CK2
HALT
HALT
GND
GND
CTW
CTP
GND
(4)
14
MB3793-42/30
■ REFERENCE CHARACTERISTIC CURVES (FOR MB3793-42)
Power Current - Power Voltage
Detection Voltage - Ambient Temperature
40
35
30
25
20
15
10
4.5
4.4
4.3
4.2
4.1
4.0
Watchdog timer monitoring (VINH = 0 V)
Ta = -40 to +85°C
VSH (Ta = +25°C)
MAX
TYP
MIN
Watchdog timer stopping (VINH = VCC)
MAX
TYP
MIN
VSH
Reset (VCC < VSH)
Inhibited
VSL
MB3793-42
f = 1 kHz
VINH
VCC
Duty ≈ 10%
VL = 0 V
VSL (Ta = +25°C)
VH = VCC
CTW
CTP
0.01 µF
0.1 µF
Ta = -40 to +85°C
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
-40
-20
0
20
40
60
80 100
Power voltage: VCC (V)
Ambient temperature: Ta (°C)
Reset Output Voltage - Reset Output Current
(N-MOS side)
Reset Output Voltage - Reset Output Current
(P-MOS side)
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
500
400
300
200
100
0
Ta
VRESET
98 mV
RON
19.6 Ω
27 Ω
IRESET
5 mA
Ta = -40°C
-40°C
+25°C
+85°C
135 mV
167 mV
Ta = +25°C
33.4 Ω
Ta = +25°C
Ta = +85°C
Ta = +85°C
Ta
VRESET
4.800 V
4.750 V
4.707 V
RON
40 Ω
IRESET
-5 mA
-40°C
+25°C
+85°C
50 Ω
Ta = -40°C
58.6 Ω
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)
15
MB3793-42/30
Reset-on Reset Time - Ambient Temperature
(when VCC rising)
Reset Output Voltage - Power Voltage
7
6
5
4
3
2
1
0
260
Pull-up resistance: 100 kΩ
240
220
200
180
160
140
120
100
80
Ta = -40 to +85°C
Ta = +25°C
MAX
Ta = +85°C
TYP
Ta = +25°C
Ta = -40°C
MIN
60
0
1
2
3
4
5
6
7
40
Power voltage: VCC (V)
20
0
-40
-20
0
20
40
60
80
100
Ambient temperature: Ta (°C)
Watchdog Timer Reset Time - Ambient Temperature
Watchdog Timer Monitoring Time - Ambient
(when monitoring)
Temperature
26
26
24
24
Ta = -40 to +85°C
Ta = -40 to +85°C
22
22
Ta = +25°C
20
18
20
MAX
18
Ta = +25°C
16
16
TYP
MAX
14
14
12
12
TYP
10
10
MIN
8
6
8
6
4
2
0
MIN
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)
16
MB3793-42/30
Power-on Reset Time - CTP Capacitance
Reset Time - CTP Capacitance
104
103
102
101
1
103
102
101
1
Ta = -40°C
Ta = -40°C
Ta = +25°C
Ta = +25°C
Ta = +85°C
Ta = +85°C
10-1
10-1
10-2
10-4
10-3
10-2
10-1
1
101
102
10-4
10-3
10-2
10-1
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
Watchdog-Timer Monitoring Time - CTW Capacitance
(under Ta condition)
104
103
103
Ta = -40°C
CTP = 1 µF
102
102
Ta = +25°C
CTP = 0.1 µF
101
101
Ta = +85°C
1
1
10-1
10-1
CTP = 0.01 µF
10-5
10-4
10-3
10-2
10-1
1
101
10-5
10-4
10-3
10-2
10-1
1
101
Watchdog-timer monitoring time setting capacitance: CTW (µF)
Watchdog-timer monitoring time setting capacitance: CTW (µF)
17
MB3793-42/30
■ PACKAGE DIMENSIONS
8-LEAD PLASTIC DUAL IN-LINE PACKAGE
+.016
–.012
.370
+0.40
–0.30
15°MAX
(9.40
)
INDEX
.244±.010
(6.20±0.25)
.300(7.62)
TYP
+.012
.039
– 0
+.012
.060
–0
.010±.002
+0.30
–0
(0.99
)
+0.30
–0
(0.25±0.05)
(1.52
)
+.014
–.012
.035
+0.35
–0.30
(0.89
)
.172(4.36)MAX
.118(3.00)MIN
.020(0.51)
MIN
.018±.003
(0.46±0.08)
.100(2.54)
TYP
Dimensions in
inches (millimeters)
1991 FUJITSU LIMITED D08006S-2C
18
MB3793-42/30
8-LEAD PLASTIC FLAT PACKAGE
(CASE No.: FPT-8P-M02)
+.010
–.008
.199
.061±.008
(1.55±0.20)
(MOUNTING HEIGHT)
(STAND OFF HEIGHT)
+0.25
(5.05
)
–0.20
.006±.004
(0.15±0.10)
.236±.016
(6.00±0.40)
45°
.197±.012
(5.00±0.30)
.154±.012
(3.90±0.30)
.020±.008
(0.50±0.20)
.016(0.40)
.017±.004
(0.42±0.10)
.050(1.27)
TYP
Ø.005(0.13) M
.008±.002
(0.20±0.05)
Details of “A” part
.016(0.40)
“A”
.008(0.20)
.007(0.18)
MAX
.004(0.10)
.026(0.65)
MAX
.150(3.81)
REF
Dimensions in
inches (millimeters)
1991 FUJITSU LIMITED F08004S-2C
19
MB3793-42/30
FUJITSU LIMITED
For further information please contact:
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Germany
Circuit diagrams utilizing Fujitsu products are included as a
means of illustrating typical semiconductor applications. Com-
plete information sufficient for construction purposes is not nec-
essarily given.
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Fax: (06103) 690-122
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such as aerospace equipments, undersea repeaters, nuclear con-
trol systems or medical equipments for life support.
F9603
FUJITSU LIMITED Printed in Japan
20
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