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TL7700CPW 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 TL7700CPW
상세설명  SUPPLY-VOLTAGE SUPERVISOR
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tpo
tpo
RESET
Vhys
VCC
1.5 V
T
T
Vs’
TL7700
www.ti.com
SLVS220F
– JULY 1999 – REVISED AUGUST 2011
A.
The sense voltage, Vs', is different from the SENSE terminal input voltage, Vs. Vs normally is 500 mV for triggering.
Figure 20. VCC-RESET Timing Chart
Output Pulse-Duration Setting
Constant-current charging starts on the timing capacitor when the sensing-line voltage reaches the TL7700
sense voltage. When the capacitor voltage exceeds the threshold level of the output drive comparator, RESET
changes from a low to a high level. The output pulse duration is the time between the point when the sense-pin
voltage exceeds the threshold level and the point when the RESET output changes from a low level to a high
level. When the TL7700 is used for system power-on reset, the output pulse duration, tpo, must be set longer
than the power rise time. The value of tpo is:
tpo = Ct × 10
5 seconds
Where:
Ct is the timing capacitor in farads
There is a limit on the device response speed. Even if Ct = 0, tpo is not 0, but approximately 5 μs to 10 μs.
Therefore, when the TL7700 is used as a comparator with hysteresis without connecting Ct, switching speeds
(tr/tf, tpo/tpd, etc.) must be considered.
Copyright
© 1999–2011, Texas Instruments Incorporated
11


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