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MITSUMI
System Reset (with built-in watchdog timer) MM1096
System Reset (with built-in watchdog timer)
Monolithic IC MM1096
Outline
This IC functions in a variety of CPU systems and other logic systems to generate a reset signal and reset the system accurately during momentary interruption or lowering of power supply voltage. It also has a built-in watchdog timer for operation diagnosis. This prevents the system from running wild by generating an intermittent reset pulse during system mis-operation.
Features
1. 2. 3. 4. 5. Built-in watchdog timer Low minimum operating voltage 130A typ. Low operating limit voltage VCC=0.8V Watchdog stop function (RCT pin) Long clock monitoring time TPR (POWER ON) : TWD (clock monitoring)=1 : 5 6. Few external parts
Package
DIP-8B (MM1096AD, MM1096BD) SOP-8C (MM1096AF, MM1096BF) SIP-8A (MM1096AS, MM1096BS)
Applications
1. Reset circuits in microcomputers, CPUs and MPUs 2. Logic circuit reset circuits 3. Microcomputer system monitoring, etc.
Pin Assignment
8
7
6
5
1
2
3
4
DIP-8B/SOP-8C (TOP VIEW)
1 2 3 4 5 6 7 8
TC NC CK GND VCC RCT VS RESET
12345678 SIP-8A
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1 2 3 4 5 6 7 8
TC NC CK GND VCC RCT VS RESET
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MITSUMI
System Reset (with built-in watchdog timer) MM1096
Pin Description
Pin No. Pin name TWD, TWR, TPR variable pins. 1 TC N.C CK GND VCC RCT VS
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Function TPR (ms) = 500 TWD (ms) = 2500 TWR (ms) = 100 CT (F) CT (F) CT (F) (TWD, TWR and TPR times are determined by the external capacitor.)
2 3 4 5 6 7 8
Clock input pin, inputs clock from logic system GND pin Voltage detection MM1096A Detection voltage variable pin 3.2V, MM1096B 4.2V OPEN, Stop connect to GND Watchdog timer stop pin Operation modes : Operation
RESET Reset output pin (low output)
Absolute Maximum Ratings
Item Power supply voltage CK pin input voltage VS pin input voltage Voltage applied to RCT pin
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Symbol VCC max. VCK VVS VRCT VOH Pd TSTG
Rating -0.3~+10 -0.3~VCC+0.3 ( < +10) = -0.3~VCC+0.3 ( < +10) = -0.3~VCC+0.3 (< +10) = -0.3~VCC+0.3 ( < +10) = 300 -40~+125
Units V V V V V mW
C
Voltage applied to RESET pin Allowable loss Storage temperature
Recommended Operating Conditions
Item Power supply voltage
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Symbol VCC IOL TWD tFC, tRC CT TOP
Rating +2.2~+7.0 0~1.0 0.1~1000 <100 0.0002~2 -25~+75
Units V mA ms s F
C
RESET sync current
Clock monitoring time setting Clock rise and fall times TC pin capacitance Operating temperature
MITSUMI
System Reset (with built-in watchdog timer) MM1096
Electrical Characteristics (DC)
Item Consumption current MM1096A MM1096B MM1096A Detection voltage MM1096B MM1096A MM1096B Detection voltage temperature coefficient Hysteresis voltage MM1096A MM1096B
(Except where noted otherwise, MM1096A : VCC=3.6V, Ta=25C, MM1096B : VCC=5.0V) Measurement conditions During watchdog timer operation VS=OPEN, VCC VS=OPEN, VCC Min. Typ. Max. Units 100 130 150 195 A
Symbol ICC VSL VSH VS/ T VHYS VTH IIH IIL VOH VOL1 VOL2 IOL ICT1 ICT2
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3.10 3.20 3.30 4.05 4.20 4.35 3.15 3.25 3.35 4.15 4.30 4.45 0.01 %/C 100 150 2 1 -2 mV V A V 0.4 0.5 V mA A A V 25 50 0.8 50 100 1.2 0 -12 3.0 4.0 -6 3.4 4.5 0.2 0.3 1 2 V
VSH-VSL, VCC
CK input threshold CK input current Output voltage (High) MM1096A MM1096B
A : VCK=3.6V, B : VCK=5.0V VCK=0V I RESET =1A VS=OPEN I RESET =0.5mA, VS=0V I RESET =1.0mA, VS=0V V RESET =1.0V, VS=0V
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Output voltage (Low) R output sync current CT charge current Minimum operating power supply voltage to ensure RESET
VTC=1.0V during watchdog timer operation -0.28 -0.48 -0.96 VTC=1.0V during power ON reset operation -1.60 -2.40 -4.80 V RESET =0.4V I RESET =0.1mA
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VCCL
0.8
1.0
MITSUMI
System Reset (with built-in watchdog timer) MM1096
Electrical Characteristics (DC)
Item MM1096A TPI MM1096B TCKW TCK TWD TWR TPR VCC CK Symbol VCC
(Except where noted otherwise, MM1096A : VCC=3.6V, Ta=25C, MM1096B : VCC=5.0V) (Except where noted otherwise, resistance unit is )
Measurement conditions 3.6V 2.8V 5.0V 4.0V or
Min. 8
Typ.
Max.
Units
VCC input pulse width
s 8 3 20 CT=0.02F CT=0.02F 25 1 5 50 2 10 2 2.0 0.2 75 3 15 10 4.0 1.0 s s ms ms ms s s s
CK input pulse width CK input cycle Watchdog timer monitoring time 1
*
Reset time for watchdog timer 2
*
Reset hold time for power supply rise 3
*
CT=0.02F, VCC
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Output delay time from VCC 4
*
TPD tR tF
RESET pin, RL=10k, CL=20pF
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Output rise time 5
* Output fall time 5 *
RESET pin, RL=10k, CL=20pF
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RESET pin, RL=10k, CL=20pF
Notes: 1 Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse until reset pulse output. In other words, reset output is output if a clock pulse is not input during this time. 2 Reset time means reset pulse width. However, this does not apply to power ON reset. 3 Reset hold time is the time from when VCC exceeds detection voltage (VSH) during power ON reset until reset release (RESET output high). 4 Output delay time is the time from when power supply voltage drops below detection voltage (VSL) until reset (RESET output low). 5 Voltage range when measuring output rise and fall is 10~90%. 6 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during power supply rise can be changed by varying CT capacitance. The times are expressed by the following formulae.
* * * * * *
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. TPR (ms) = 500 CT (F) . . TWD (ms) = 2500 CT (F) . . 100 CT (F) TWR (ms) = . Example : When CT=0.02F . TPR = 10ms . TWD . . 50ms = TWR . . 2ms =
MITSUMI
System Reset (with built-in watchdog timer) MM1096
Measuring Circuits
Measuring Circuit 1 (DC) Measuring Circuit 2 (AC)
Measuring Circuit 1
Item Consumption current Detection voltage CK input threshold CK input current Output voltage (High) Output voltage (Low) Output sink current CT charge current 1 CT charge current 2 Minimum operating power
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SW & Power Supply Table
SW2 OFF OFF OFF OFF OFF OFF OFF ON ON ON OFF OFF OFF SW3 OFF ON ON OFF OFF OFF ON ON ON ON OFF OFF ON SW4 ON ON ON ON ON ON ON ON ON ON ON ON ON SW5 ON ON ON ON ON ON ON ON ON ON OFF OFF ON SW6 A A A A A A A A A B A A A VCC 3.6V 3.6V 3V 3V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 0V 2V 0V VCK 3.6V 0V 0V 0V 3V 3.6V 0V 3.6V 3.6V 3.6V 3.6V VCT 0V 2V 2V 1V 0V 0V 2V 2V 2V 2V 1V IV 0V -1A 0.5mA 1.0mA I RESET
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Symbol SW1 ICC VSL VSH VTH IIH IIL VOH VOL1 VOL2 IOL1 ITC1 ITC2 VCCL OFF OFF OFF OFF OFF OFF ON ON ON OFF OFF OFF ON
VM, IM ICC VO1, CRT1 VO1, CRT1 ICK, VCK ICK ICK VO1 VO1 VO1 IO1 ITC ITC VO1, VCC
Notes
VO=1V
supply voltage to ensure RESET
Measuring Circuit 2
Item VCC input pulse width TP1 CK input pulse width TCKW CK input cycle Watchdog timer monitoring time Reset time for watchdog timer Reset hold time for power supply rise Output delay time from VCC Output rise time Output fall time TCK TWD TWR TPR TPD TR TF
SW & Power Supply Table
VCCA 3.6V 2.8V 3.6V 0V T1 VCC 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 1.4V 0V 1.4V 0V 1.4V 0V T2 or T2 T2 T3 3.6V 3.6V 3.6V 0V 3.6V 3.6V VCKA T2 T3 VCK CRT CRT1 CRT2 CRT1 CRT2 CRT1 CRT2 CRT1 CRT2 CRT1 CRT2 CRT1 CRT2 CRT1 CRT1 CRT1 Notes T1=8s T2=3s T3=20s
Symbol SW1 SW2 C A A A A BA C A A B B B A A A A A A
MITSUMI
System Reset (with built-in watchdog timer) MM1096
Block Diagram
RA MM1096A MM1096B ~ 305k ~ 350k RB ~ 195k ~ 150k -
Note 1: CP=0.1F approx. Note 2: C > 1000pF = Note 3: The watchdog timer can be stopped by connecting the RCT pin to GND. Then it functions as a voltage detection circuit.)
Timing Chart
VCC
VSH VSL 0.8V
CK
TCK
TC
RESET
TPR
TWD
TWR
TPR
1
2
345
5
67
89
10
1 12 1
MITSUMI
System Reset (with built-in watchdog timer) MM1096
Description of Operation
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1. RESET goes low when VCC rises to approximately 0.8V. Approximately 1A (VCC=0.8V) of pull up current is output from RESET . . 2. Capacitor CT charging starts when VCC rises to VSH (MM1096A = 3.25V, MM1096B = 4.3V). Output is in . . reset state at this time. 3. Output reset is released (RESET goes high) after a certain time (TPR), from when CT starts charging until discharge (the time from when CT voltage reaches a certain threshold value 1 (. . 1.4V) until CT voltage = . drops to a certain threshold value 2 ( = 0.2V). . Reset hold time : TPR is as follows. TPR (ms) . . 500 CT (F) = CT charging starts again after reset release, and watchdog timer operation begins. Clock input to the CK pin during CT charging will cause mis-operation. 4. If a clock is input (negative edge trigger) to the CK pin during CT charging, C switches from charging to discharge. 5. Discharge switches to charging when CT voltage drops to a certain threshold value (. . 0.2V). Steps 4 and = 5 are repeated while a normal clock is input from the logic system. 6. Output goes to reset state (RESET goes low) when the clock ceases and CT voltage reaches reset ON threshold value (. . 1.4V). = The formula for CT charging time (TWD : watchdog timer monitoring time) until reset is output is as follows. . TWD (ms) = 2500 CT (F) . 7. Watchdog timer reset time TWR is the discharge time until CT voltage drops to reset OFF threshold value . ( = 0.2V). The formula is as follows. . TWR (ms) . . 100 CT (F) = After reset OFF threshold value is reached, output reset is released and CT starts charging. Thereafter, steps 4 and 5 are repeated if a normal clock is input, and when the clock ceases, 6 and 7 are repeated. 8. Reset is output when VCC drops to VSL (MM1096A . . 3.2V, MM1096B . . 4.2V). CT is charged = = simultaneously. 9. CT charging starts when VCC rises to VSH. When VCC drops momentarily, CT charging begins after the charge is first discharged, if the time from VCC dropping below VSL until it rises to VSH is longer than the Vcc input pulse width standard value TPI. 10.Output reset is released after VCC goes above VSH and after TPR, and the watchdog timer starts. Thereafter, 8~10 are repeated when VCC goes below VSL. 11.When power is OFF, reset is output if VCC goes below VSL. 12.When VCC drops to 0V, reset output is held until VCC reaches 0.8V.
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