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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FT7521
Rev. 1.0.8
4
FT7521
—
Re
set
Ti
mer
with
Fi
x
ed
De
lay
and
Rese
t
Pulse
DC Electrical Characteristics
Conditions of TA=-40 to 80°C with VCC=1.8 - 5.0 V OR TA=-25 to 85°C with VCC=1.7 – 5 V OR TA=0 to 85°C with
VCC=1.65 – 5 V produce the performance characteristics below.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
VIH
Input High Voltage
DSR, /SR0
0.65 x VCC
V
VIL
Input Low Voltage
DSR, /SR0
0.25 x VCC
V
VOL
Low Level Output Voltage
RST, IOL=500 A
0.3
V
RST, IOL=3 mA, VCC=3.0 V
0.3
RPU
Integrated Pull-Up Resistor on /SR0
50
k
IIN
Input Leakage Current /SR0
VIN= VCC
1.0
A
Input Leakage Current DSR
0V
V
IN 5.0 V
1.0
ICC
Quiescent Supply Current (Timer
Inactive)
/SR0=VCC
1
A
Dynamic Supply Current (Timer Active) /SR0=0 V
200
AC Electrical Characteristics
Conditions of TA=-40 to 80°C with VCC=1.8 - 5.0 V OR TA=-25 to 85°C with VCC=1.7 – 5 V OR TA=0 to 85°C with
VCC=1.65 – 5 V produce the performance characteristics below.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
tPHL1
Timer Delay, /SR0 to RST (DSR=0)
CL=5 pF, RL=5 K,
see Figure 4
6.0
7.5
9.0
s
tREC
Reset Timeout Delay
320
400
480
ms
Capacitance Specifications
TA=+25C.
Symbol
Parameter
Condition
Typ.
Unit
CIN
Input Capacitance
VCC=GND
4
pF
COUT
Output Capacitance
VCC=5.0 V
5
pF
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