MICREL MM5451BV, MM5450BV, MM5451BN, MM5450BN Datasheet
MM5450/5451 Micrel
K
L
MM5450/5451
LED Display Driver
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
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 Junction Temp. Range Package
MM5450BN –40°C to +85°C 40-pin Plastic DIP
MM5451BN –40°C to +85°C 40-pin Plastic DIP
MM5450BV –40°C to +85°C 44-pin PLCC
MM5451BV –40°C to +85°C 44-pin PLCC
Block Diagram
BRIGHTNESS
CONTRO
DATA ENABLE/OUT 35
(See Note 1)
SERIAL DATA
CLOC
VDD
19
23
22
21
Note 1: Pin 23 is Data Enable in MM5450
Pin 23 is Output 35 in MM5451
OUT 34
20 24
35 OUTPUT BUFFERS
35 LATCHES
35-BIT SHIFT
REGISTERS
Figure 1.
OUT 1
18
RESET
LOAD
1
RESET
(only available
in die form)
870 01
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
May 2000 1 MM5450/5451
MM5450/5451 Micrel
8
9
0
2
3
Connection Diagram: Die
SS
OUTPUT BIT 1
OUTPUT BIT 2
OUTPUT BIT 21
OUTPUT BIT 2
OUTPUT BIT 13
OUTPUT BIT 14
OUTPUT BIT 15
OUTPUT BIT 16
OUTPUT BIT 17
OUTPUT BIT 1
V
OUTPUT BIT 2
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
V
SS
MM5450/5451
DIE PINOUT
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 3
BRIGHTNESS CONTROL
RESET
OUTPUT BIT 1
OUTPUT BIT 2
V
DD
Note: Die size is 0.106" x 0.099"
Figure 2.
Connection Diagram: Dual-in-line Package
CLK
DATA
ENABLE
OUTPUT BIT 35
OUTPUT BIT 34
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
OUTPUT BIT 27
OUTPUT BIT 28
OUTPUT BIT 29
V
SS
OUTPUT BIT 30
OUTPUT BIT 31
OUTPUT BIT 32
OUTPUT BIT 33
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
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
OUTPUT BIT 17
OUTPUT BIT 16
OUTPUT BIT 15
OUTPUT BIT 14
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
V
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
OUTPUT BIT 18
Figure 3a, 3b.
MM5450/5451 2 May 2000
MM5450/5451 Micrel
Connection Diagram: Plastic Leaded Chip Carrier
SS
V
NC
OUTPUT BIT 18
OUTPUT BIT 19
OUTPUT BIT 20
OUTPUT BIT 21
OUTPUT BIT 22
DATA ENABLE
OUTPUT BIT 34
OUTPUT BIT 33
OUTPUT BIT 23
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
36
OUTPUT BIT 27
35
NC
34
OUTPUT BIT 28
33
OUTPUT BIT 29
32
OUTPUT BIT 30
31
OUTPUT BIT 31
30
OUTPUT BIT 32
29
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
OUTPUT BIT 14
OUTPUT BIT 15
OUTPUT BIT 16
OUTPUT BIT 17
6 44 43 42 41 40
7
8
9
10
11
12
13
14
15
16
17
OUTPUT BIT 3
OUTPUT BIT 2
OUTPUT BIT 1
12393384375
MM5450BV
232221201918 24 25 26 27 28
NC
DD
V
DATA IN
CLOCK IN
BRIGHTNESS CONTROL
SS
V
NC
OUTPUT BIT 18
OUTPUT BIT 19
OUTPUT BIT 20
OUTPUT BIT 21
OUTPUT BIT 14
OUTPUT BIT 15
OUTPUT BIT 16
OUTPUT BIT 17
6 44 43 42 41 40
NC
7
8
9
10
11
12
13
14
15
16
17
OUTPUT BIT 13 OUTPUT BIT 23
12393384375
2221201918 24 25 26 27 28
OUTPUT BIT 22
36
35
34
33
32
31
30
29
Figure 4a, 4b.
May 2000 3 MM5450/5451
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