ITT - Index of

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I mm
ITT7105
EIGHT DIGIT DRIVER
.L.L ____ _
SEMICONDUCTORS
EIGHT DIGIT DRIVER
These circuits are monolithic bipolar chips
which contain all the electronics required to
provide the necessary digit strobe drive interface
between the G.!. C550 and C540 series of
single MOS calculator chips for LED displays.
Designed in bipolar, the circuits are designed
to run off two supply rails, i.e. the MOS supply
rail, VDD of nominally -i5V and a second battery
supply rail of between -3.6 'and -6.0V.
A feature of the circuit arrangement is that
the input current is constant regardless of the
supply voltages over the specified range. The
main features of the design is in the very low
power dissipation which is typically only 3.3mW
per package total both supplies and the inclusion
of built in on chip pull down resistors.
The circuits are designed for use witli the
ITT7i03 series of LED segment drivers to
provide a complete LED monolithic interface
system between the G.!. C550-554 series of
single MOS calculator chips and LED displays.
DUAL-IN-LiNE PACKAGE
PIN CONFIGURATION
(TOP VIEW)
Vss
OJ
o 02
VBATT 03
VOO 04
04-8 05.
03-7 06
0,-5 07
TECHNICAL DESCRIPTION
MAXIMUM RATINGS
VDD (with respect to Vss) .... - 20V to +O.3V
VBattery (with respect to Vss) ... -7Vto +O.3V
Input voltage rating (with
respect to Vss) ............. -20Vto +O.3V
Storage temperature range .. -55°C to +85°C
Operating temperature range .. O°C to +50°C
Digit Driver Circuit
ELECTRICAL CHARACTERISTICS
VOD ==
-i3.0V to -i5.5V
VBattery == 3.6V to -6.0V
Vss ==
OV
Packaging
These circuits are available in both plastic and
ceramic i6-pin DIP.
8.,20