MM5450V National, MM5450V Datasheet

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MM5450V

Manufacturer Part Number
MM5450V
Description
LED Display Drivers
Manufacturer
National
Datasheet

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C 1995 National Semiconductor Corporation
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
Applications
Y
Y
Y
Y
Y
Block Diagram
COPS
COPS
Industrial control indicator
Relay driver
Digital clock thermometer counter voltmeter
Instrumentation readouts
TM
is a trademark of National Semiconductor Corporation
TM
or microprocessor displays
TL F 6136
DD
FIGURE 1
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
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
RRD-B30M105 Printed in U S A
Socket
Board
TL F 6136 –1
February 1995
e
e
49 C W
54 C W

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MM5450V Summary of contents

Page 1

... TM Y Industrial control indicator Y Relay driver Y Digital clock thermometer counter voltmeter Y Instrumentation readouts Block Diagram COPS trademark of National Semiconductor Corporation C 1995 National Semiconductor Corporation TL F 6136 Features Y Continuous brightness control Y Serial data input Y No load signal required Y Enable (on MM5450) Wide power supply operation ...

Page 2

... Note 5 AC input waveform specification for test purpose t Note 6 Clock input rise and fall times must not exceed 300 ns Connection Diagrams Dual-In-Line Package Top View FIGURE 2a Order Number MM5450N MM5451N MM5450V or MM5451V Power Dissipation at Molded DIP Package Board Mount Molded DIP Package Socket Mount b a ...

Page 3

Connection Diagrams (Continued) Plastic Chip Carrier Top View Plastic Chip Carrier Top View 6136– 6136–14 ...

Page 4

Functional Description Both the MM5450 and the MM5451 are specifically de- signed to operate 4- or 5-digit alphanumeric displays with minimal interface with the display and the data source Seri- al data transfer from the data source to the display ...

Page 5

Functional Description Typical Performance Characteristics TL F 6136– 6 FIGURE 5 Typical Applications FIGURE 8 Typical Application of Constant Current Brightness Control FIGURE 9 Brightness Control Varying the Duty Cycle (Continued) FIGURE 4 Input Data Format TL F 6136–7 FIGURE ...

Page 6

Typical Applications (Continued) Basic Electronically Tuned Radio System Duplexing 8 Digits with One MM5450 6136– 6136–12 ...

Page 7

Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (N) Order Number MM5450N or MM5451N NS Package Number N40A 7 ...

Page 8

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications inches (millimeters) (Continued) Plastic Chip Carrier (V) Order Number MM5450V or MM5451V NS Package Number V44A 2 A critical component is any component of a life ...

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