Micrel MM5450, MM5451 User Manual
General Description
MM5450/5451
LED Display Driver
Features
The MM5450 and MM5451 LED display drivers are
monolithic MOS IC’s fabricated in an N-Channel, metalgate 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
• 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
Standard Pb-Free
MM5450BN MM5450YN –40°C to+85°C 40-pin PDIP
MM5451BN MM5451YN –40°C to+85°C 40-pin PDIP
Junction
Temp. Range
Package
MM5450BV MM5450YV –40°C to+85°C 44-pin PLCC
MM5451BV MM5451YV –40°C to+85°C 44-pin PLCC
____________________________________________________________________________________________________________
Block Diagram
BRIGHTNESS
CONTROL
19
VDD
OUT 34
20 24
35 OUTPUT BUFFERS
OUT 1
18
DATA ENABLE/OUT 35
SuperSwitcher and Super ßeta PNP are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
February 2006
(See Note 1)
SERIAL DATA
CLOCK
23
22
21
Note 1: Pin 23 is Data Enable in MM5450
Pin 23 is Output 35 in MM5451
35 LATCHES
35-BIT SHIFT
REGISTER
Figure 1.
408
LOAD
RESET
1
RESET
(only available
in die form)
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-021606
(408) 955-1690
Micrel, Inc. MM5450/5451
Connection Diagram: Die
Figure 2.
Connection Diagram: Dual-in-line Package
V
OUTPUT BIT 17
OUTPUT BIT 16
OUTPUT BIT 15
OUTPUT BIT 14
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 3
OUTPUT BIT 2
OUTPUT BIT 1
BRIGHTNESS
CONTROL
V
1 40
SS
2 39
3 38
4 37
5 36
6 35
7 34
8 33
9 32
10 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
DD
MM5450BN/YN
OUTPUT BIT 18
OUTPUT BIT 19
OUTPUT BIT 20
OUTPUT BIT 21
OUTPUT BIT 22
OUTPUT BIT 23
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
OUTPUT BIT 27
OUTPUT BIT 28
OUTPUT BIT 29
OUTPUT BIT 30
OUTPUT BIT 31
OUTPUT BIT 32
OUTPUT BIT 33
OUTPUT BIT 34
DATA ENABLE
DATA IN
CLOCK IN
Figure 3a, 3b.
V
OUTPUT BIT 17
OUTPUT BIT 16
OUTPUT BIT 15
OUTPUT BIT 14
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 3
OUTPUT BIT 2
OUTPUT BIT 1
BRIGHTNESS
CONTROL
V
1 40
SS
2 39
3 38
4 37
5 36
6 35
7 34
8 33
9 32
10 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
DD
MM5451BN/YN
OUTPUT BIT 18
OUTPUT BIT 19
OUTPUT BIT 20
OUTPUT BIT 21
OUTPUT BIT 22
OUTPUT BIT 23
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
OUTPUT BIT 27
OUTPUT BIT 28
OUTPUT BIT 29
OUTPUT BIT 30
OUTPUT BIT 31
OUTPUT BIT 32
OUTPUT BIT 33
OUTPUT BIT 34
OUTPUT BIT 35
DATA IN
CLOCK IN
February 2006
2
M9999-021606
(408) 955-1690
Micrel, Inc. MM5450/5451
Connection Diagram: Plastic Leaded Chip Carrier
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
NC
OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
6 44 43 42 41 40
7
8
9
10
11
12
13
14
15
16
17
12393384375
MM5450BV/YV
232221201918 24 25 26 27 28
OUTPUT BIT 23
OUTPUT BIT 24
OUTPUT BIT 25
36
OUTPUT BIT 26
35
OUTPUT BIT 27
34
NC
33
OUTPUT BIT 28
32
OUTPUT BIT 29
31
OUTPUT BIT 30
30
OUTPUT BIT 31
29
OUTPUT BIT 32
February 2006
12393384375
MM5451BV/YV
232221201918 24 25 26 27 28
OUTPUT BIT 23
OUTPUT BIT 24
OUTPUT BIT 25
36
OUTPUT BIT 26
35
OUTPUT BIT 27
34
NC
33
OUTPUT BIT 28
32
OUTPUT BIT 29
31
OUTPUT BIT 30
30
OUTPUT BIT 31
29
OUTPUT BIT 32
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
NC
OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
6 44 43 42 41 40
7
8
9
10
11
12
13
14
15
16
17
Figure 4a, 4b.
3
M9999-021606
(408) 955-1690
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