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740001.qxd
04/01/02
Specification
Supply
2.6 - 3.4VDC
Current consumption
<10µA, 5µA typical.
Reset Button
The 7400 has a Reset Button.
The 7401 does not.
Display
8 digit black LCD, 8mm characters
Count Range
99999999 - rollover to 0
Note:
This product is ideally suited to battery powered applications. Should the product be used
in a circuit where an external power source is used, then the complete system will require
separate approval to meet the CE standards.
Connections
This product can be powered from a higher
voltage DC supply using the external voltage
control circuit shown on page 7.
<= +18V
+
1
–
High Speed Count
(TTL/CMOS)
<=5KHz
=>100 S
+
D
internal
resistor
–
Direction
up
<=18V
(TTL/CMOS)
2
14:36
Page 2
Operating temperature
-10°C to +60°C
Storage temperature
-20°C to +60°C
Altitude
Up to 2000m
Relative Humidity
80% max up to 31°C, decreasing to 50%
max at 40°C
R
–
2
2.6 - 3.4V
Low Speed Count
(Contact Closure/
<=18V
Open Collector)
0.7V
µ
External Reset
(Contact Closure/
0.7V
Open Collector)
down
Draft
1 D +
+
2
internal
resistor
–
<=20Hz
<=18V
=>25mS
0.7V
+
R
internal
resistor
–
<=18V
=>15mS
0.7V
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