MM5450 MM5451 LED Display Drivers
February 1995
MM5450 MM5451 LED Display Drivers
General Description
The MM5450 and MM5451 are monolithic MOS integrated
circuits utilizing N-channel metal-gate low threshold en-
hancement mode and ion-implanted depletion mode devic-
es They are available in 40-pin molded or cavity dual-in-line
packages The MM5450 MM5451 is designed to drive com-
mon anode-separate cathode LED displays A single pin
controls the LED display brightness by setting a reference
current through a variable resistor connected to V
DD
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
COPS
TM
or microprocessor displays
Industrial control indicator
Relay driver
Digital clock thermometer counter voltmeter
Instrumentation readouts
Continuous brightness control
Serial data input
No load signal required
Enable (on MM5450)
Wide power supply operation
TTL compatibility
34 or 35 outputs 15 mA sink capability
Alphanumeric capability
i
JA
DIP
Board
e
49 C W
Socket
e
54 C W
Block Diagram
TL F 6136鈥?
FIGURE 1
COPS
TM
is a trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 6136
RRD-B30M105 Printed in U S A