ITT - Index of

ITT
ITT501
QUAD SEGMENT DRIVER
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SEMICONDUCTORS
QUAD SEGMENT
DRIVER
Package 14 pin Dual-in-Line
• MOS to LED segment driver
• 50 rnA source or sink capability
• Suitable for desk top and pocket calculator
• Operation down to 5V
• High gain Darlington Outputs
PIN CONFIGURATION (Top View)
The ITT 501 is a monolithic, integrated circuit
which provides the interface between MOS
integrated circuits and Light Emitting Diode
(LED) displays. The ITT 501 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 is designed to be used with current
source resistors in .series with the LED
segments. This aids in matching segment
intensity and reduces the total power dissipation.
A resistor value of 200 ohms provides a
good current source for each segment when the
ITT 501 together with the ITT 500 (Digit Driver)
is used at 15 volts with 2 volt/25mA LED
displays. The Vee terminal must be connected
to the most positive supply.
SCHEMATIC
YIN 4.0K
Yoo
6.81<
6.8K
YOUT
ABSOLUTE MAXIMUM RATINGS
(Measurement with respect to GND)
(Each Drive, 4 per package)
Characteristics
Supply Voltage Vee
Input Voltage (VIN#Ve e )Vin
Isolation Voltage Vss.
Continuous Total Power-
Dissipation
Storage Temperature
Range
Operating Temperature
Range
Unit
18 V
18 V
18 V
800mW
-559C to + 125°C
OOCto + 50°C
8-6