MM1142XF データシートの表示（PDF） - Mitsumi
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MM1142XF Datasheet PDF : 5 Pages
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MITSUMI
System Reset (with built-in watchdog timer) MM1142
Item
Symbol
Measurement conditions
2.6V
VCC input pulse width TPI
VCC
1.8V
TPI
CK input pulse width TCKW CK
TCKW
or
Min. Typ. Max. Units
20
µS
10
µS
TCK
CK input cycle
TCK CK
50
µS
Watchdog timer
* monitoring time 1
Watchdog timer
* reset time 2
Reset hold time for
* power supply rise 3
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RESET delay time
TWD
TWR
TPR
tPDR
CT=0.022µF
CT=0.022µF
CT=0.022µF
VCC : High Low, RLR=100kΩ, CLR=15pF
50 100 150 mS
1
2
3
mS
50 100 150 mS
10
µS
BC delay time
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RESET rise time
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RESET fall time
BC rise time
BC fall time
tPDB
tRR
tFR
tRB
tFB
VCC : High Low, RLB=10kΩ, CLB=15pF
RLR=100kΩ, CLR=15pF
RLR=100kΩ, CLR=15pF
RLB=10kΩ, CLB=15pF
RLB=10kΩ, CLB=15pF
10
µS
10
µS
2
µS
10
µS
2
µS
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 (VSHR) during power ON reset until
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reset release (RESET output high).
*4 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.
Example : When CT=0.22F
TPR (mS) - ~ 4500 CT (µF)
TWD (mS) - ~ 4500 CT (µF)
TWR (mS) - ~ 90 CT (µF)
TPR - ~ 100mS
TWD - ~ 100mS
TWR - ~ 2mS
*5 TWD can be varied by placing a resistor (1MΩ or more)between the RCT pin and VCC.
*6 The voltage range when measuring output rise and fall time is 10~90%.
*7 VCC rise time should be 100µS or more, and fall time should be 50µS or more.
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