MM5450 Micrel, MM5450 Datasheet

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MM5450

Manufacturer Part Number
MM5450
Description
LED Display Driver
Manufacturer
Micrel
Datasheet

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MM5450/5451
General Description
The MM5450 and MM5451 LED display drivers are monolithic
MOS IC’s fabricated in an N-Channel, metal-gate process.
The technology produces low-threshold, enhancement-mode,
and ion-implanted depletion-mode devices.
A single pin controls the LED display brightness by setting a
reference current through a variable resistor connected to
the supply.
Applications
• Industrial control indicator
• Relay driver
• Digital clock, thermometer, counter, voltmeter
• Instrumentation readouts
Block Diagram
May 2000
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
BRIGHTNESS
DATA ENABLE/OUT 35
CONTROL
SERIAL DATA
(See Note 1)
CLOCK
19
23
22
21
Note 1: Pin 23 is Data Enable in MM5450
Pin 23 is Output 35 in MM5451
VDD
20
OUT 34
35 OUTPUT BUFFERS
Figure 1.
24
1
35-BIT SHIFT
35 LATCHES
REGISTERS
Features
• Continuous brightness control
• Serial data input
• No load signal requirement
• Enable (on MM5450)
• Wide power supply operation
• TTL compatibility
• 34 or 35 outputs, 15mA capability
• Alphanumeric capability
Ordering Information
Part Number
MM5450BN
MM5451BN
MM5450BV
MM5451BV
OUT 1
18
RESET
MM5450/5451
LED Display Driver
Junction Temp. Range
LOAD
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
1
RESET
(only available
in die form)
40-pin Plastic DIP
40-pin Plastic DIP
44-pin PLCC
44-pin PLCC
MM5450/5451
Package
Micrel
870 01

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MM5450 Summary of contents

Page 1

... MM5450/5451 General Description The MM5450 and MM5451 LED display drivers are monolithic MOS IC’s fabricated in an N-Channel, metal-gate process. The technology produces low-threshold, enhancement-mode, and ion-implanted depletion-mode devices. A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to the supply ...

Page 2

... OUTPUT BIT 5 14 OUTPUT BIT 4 15 OUTPUT BIT 3 16 OUTPUT BIT 2 17 OUTPUT BIT 1 18 BRIGHTNESS 19 CONTROL MM5450/5451 MM5450/5451 DIE PINOUT Figure OUTPUT BIT 18 39 OUTPUT BIT 19 OUTPUT BIT 17 38 OUTPUT BIT 20 OUTPUT BIT 16 37 OUTPUT BIT 21 OUTPUT BIT 15 36 ...

Page 3

... OUTPUT BIT 23 38 OUTPUT BIT 24 37 OUTPUT BIT 25 36 OUTPUT BIT 26 35 OUTPUT BIT OUTPUT BIT 28 32 OUTPUT BIT 29 31 OUTPUT BIT 30 30 OUTPUT BIT 31 29 OUTPUT BIT OUTPUT BIT MM5450/5451 Micrel ...

Page 4

... Note 4: V should be regulated by the user. See Figures 8 and 9 for allowable V OUT Note 5: AC input waveform specification for test purpose: t Note 6: Clock input rise and fall times must not exceed 300ns. MM5450/5451 Operating Ratings to V +12V Supply Voltage ( Ambient Temperature Range (T T +85 C ...

Page 5

... MM5450/5451 Functional Description The MM5450 and MM5451 were designed to drive either 4- or 5-digit alphanumeric LED displays with the added benefit of requiring minimal interface with the display or data source. Data is transferred serially via 2 signals; clock and serial data. Data transfer without the added inconvenience of an external load signal is accomplished by using a format of a leading “ ...

Page 6

... TEMPERATURE (°C) Figure 2N2907 CD4046 (VCO) 5V PIN 19 20 MM5450 1 Figure 11. Brightness Control Varying the Duty Cycle 85° 150°C (MAX (mA) LED Figure 100 5V MM74HC123 µS Micrel MM5450 1 May 2000 ...

Page 7

... LED DISPLAY MM5450 DISPLAY DRIVER ELECTRONIC TUNING CONTROLLER STATION DETECT, ETC. Figure 12. Basic Electronically Tuned Radio System V LED 2–8, 40 32–39 24–31 MM5450 CONTROL 100k TYP. Figure 13. Duplexing 8 Digits with One MM5450. 7 PLL SYNTHESIZER V = 3.0V LED V LED MM5450/5451 Micrel ...

Page 8

... TEL This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MM5450/5451 2.040 1 ...

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