Datasheet

8 digit LCD
bi-directional
totalising counters for
PCB mounting, with and
without front panel reset
pushbutton
These PCB mount bi-directional totalising counters
operate from an external 3VDC supply. Both have
an electrical reset and the 7400 also has a front
panel push button reset.
■ 8 digit high contrast LCD characters.
■ Latest CMOS circuitry achieves an
expected battery life of 10 years (
1
⁄2 AA
900mAH 3V lithium battery).
■ Available with or without reset.
■ Remote reset facility.
■ Leading zero blanking.
■ Add/subtract counting of pulses up
to 10kHz.
■ Low speed contact closure input with
integral de-bounce circuitry.
■ UL and cUL/CSA approved.
Inputs are provided for count, direction and external
reset.
*Event counting
*OEM Equipment eg electricity meters
47mm(W) x 21mm(W) x 13.5mm(D)
Supply Voltage
2.6 - 3.4VDC
Current Consumption
Less than 10µA, typically 5µA
Display
8 digit, 8mm high contrast LCD characters with leading
zero blanking
Electronic Count Input (1)
10kHz maximum, positive edge triggered, 0.7V
threshold, 100µS minimum pulse length, TTL/CMOS
Compatible
Low Speed Count Input (2)
Contact closure/open collector input, 30Hz maximum,
negative edge triggered, 0.7V threshold, 25mS minimum
pulse length
Reset Input (R)
Contact closure/open collector, negative edge triggered,
0.7V threshold, 15mS minimum pulse length
Direction Input (D)
Electronic input TTL/CMOS Compatible. Add=logic 1,
Subtract=logic 0(0V)
Operating Temp.
-10°C to +60°C
Storage Temp.
-20°C to +70°C
7400AS With pushbutton reset
7401AS No pushbutton reset
*Ideally suited to portable, battery powered applications
*Position, length and distance measuring applications
0.2mm Dia hole
35.56mm
10.5mm
2.54mm
R - 2 1D+
47mm
7.62mm
21mm
3mm
7.62mm
13.5mm
2.5mm
3mm
➤
0.2mm Dia spigots
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Telephone Metering
7400AS/7401AS
LR 96702
E 135458
7400AS and 7401AS
Electronic Totalisers
Typical Application
Dimensions Specification Ordering Information
4.05
4