Electrical Characteristics: VCC = 9V, RP = 9.1 M½, CT = 4.7µF, Cpw = 0.1µF, Rpw = 10M½,
0¡ ² TA ² 85¡ unless otherwise specified
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
■ Recommended Component Values
Rp Program Resistor
1.0
4.7
0.01
1
9.1
M½
µF
CT Cycle Timer Capacitor
22.0
0.10
10
CPW Pulse Stretcher Capacitor
µF
R
PW Pulse Stretcher Resistor
M½
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8L PDIP & SO Narrow
1
2
3
4
5
6
7
8
RP
Test period programming resistor.
Voltage sense comparator input.
Test period, duration programming capacitor.
Common negative
SENSE
CT
COM
Load Switch
OUT
PW
Collector of pulse loading NPN transistor.
Alarm Pulse width-stretcher output
Output pulse-width programming RC.
Power source.
VCC
Typical Performance Characteristics
CT Discharge Impedance vs CT Voltage (Typ +25¡C)
1000
900
800
700
600
500
400
8.8
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
CT Voltage
Timing Diagram
VCC
7.1V
VCC
6.7V
33S
Tt
8V
CT
4.6V
1V
Tp
1.14ms
1V
1V
Load
Switch
VCC
VCC
Vsat
Td
1ms
2.5V
1.5V
0V
0V
PW
Tpw
Vsat
510ms
OUT
VCC
VCC
BATT. OK
BATT. LOW
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
