ITT - Index of

ITT
11T502
HEX DIGIT DRIVER
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SEMICONDUCTORS
HEX DIGIT DRIVER
PACKAGE 16 Pin Dual-in-Line
• MOS to LED digit driver
• 200 rnA sink capability at 0.4 volts
• Suitable for pocket calculators
• "Chip enable" for extended battery life
• High gain Darlington Outputs
ITT 502 is a monolithic integrated circuit which
provides the interface between MOS integrated
circuits and Light Emitting Diode (LED) Digit
Displays. The ITT 502 is designed to be used in
serially addressed multi-digit displays. This
time-multiplexed system, using a segment
address and digit scan method of LED drive,
minimizes the number of drivers required. This
circuit, together with the ITT 503 (segment
driver), was designed to operate with two
different power supplies.
The first being a battery (Vee) where the
vOltage may range from 3.5 to 9 volts and
supplies the majority of the load currents
(display currents). The second (Vss) supply,
being a D.C. to D.C. converter or regulator
which maintains the voltage between 7 and 9
volts. In order to maximize the voltage from the
battery across the load, the ITT 502 output was
designed to provide 200 mA with only O.4V
Vo L. The "Chip Enable" circuit allows turning
the load (display) "off" independently of the
input signals.
SCHEMATIC
Pin Configuration (Top View)
Characteristics
Vss (Vss VIN orVeE)
. Vee
Continuous total power
dissipation
Storage temperature range
Operating temperature
9 V
9 V
Units
800mW
-55 C to 125 C
o C to 50 C
(Each driver, 6 per package)
8-8