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What is MM5450?

This electronic component, produced by the manufacturer "Microchip", performs the same function as "LED Display Driver".


MM5450 Datasheet PDF - Microchip

Part Number MM5450
Description LED Display Driver
Manufacturers Microchip 
Logo Microchip Logo 


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MM5450/51
LED Display Driver
Features
• Continuous Brightness Control
• Serial Data Input
• No Load Signal Requirement
• Enable (MM5450 Only)
• Wide Power Supply Operation
• TTL Compatibility
• 34 or 35 Outputs, 15 mA Capability
• Alphanumeric Capability
Applications
• Industrial Control Indicator
• Relay Driver
• Digital Clock, Thermometer, Counter, Voltmeter
• Instrumentation Readouts
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.
Block Diagram
BRIGHTNESS
CONTROL
OUT 34
VDD
20 24
OUT 1
18
19
35 OUTPUT BUFFERS
DATA ENABLE/OUT 35
(See Note 1)
SERIAL DATA
23
22
21
CLOCK
35 LATCHES
LOAD
35-BIT SHIFT
REGISTER
RESET
Note 1: Pin in Data Enable in MM5450
Pin in Output 25 in MM5451
RESET
(only available
1 in die form)
2016 Microchip Technology Inc.
DS20005651A-page 1

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MM5450 equivalent
MM5450/51
TABLE 1-1: ELECTRICAL CHARACTERISTICS
Electrical Characteristics: 4.5V VDD 11V, VSS = 0V; TA = 25°C, bold values valid for –40°C TA +85°C,
unless otherwise noted.
Parameter
Symbol Min. Typ. Max. Units
Conditions
Power Supply Current
8.5
10
mA
–25°C to +85°C, excluding output loads
–40°C to +85°C, excluding output loads
Data Input Voltage
VL –0.3 0.8
VH 2.2 VDD V
VDD
2
VDD
Logic-0 level, ±10 µA input bias
Logic-1 level, 4.75V VDD 5.25V
VDD > 5.25V
Brightness Control Input
Current
0 0.75 mA
Note 1
— — 10
0 10 µA
Segment off, VOUT = 3.0V
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 0 µA
Output Sink Current
2.0 2.7
4
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 100 µA
mA
15 25
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 750 µA
Brightness Control Input
Voltage
3.0 4.3 V
Input current = 750 µA
Output Matching
— — — ±20 %
Clock Input Frequency
fC
— — 500 kHz
Clock Input High Time tH 950 — — ns
Clock Input Low Time tL 950 — — ns
Data Input Setup Time
tDS
300
ns
Data Input Hold Setup
Time
tDH
300
ns
Note 3, Note 4
Note 5, Note 6
Note 5, Note 6
Note 5, Note 6
Data Enable Input Setup
Time
tDES
100
ns
Reset Pad Current
–8 — 8 µA
Die.
Note 1: With a fixed resistor on the brightness input pin, some variation in brightness will occur among devices.
2: See Figure 2-1, Figure 2-2, and Figure 2-3 for recommended operating conditions and limits. Absolute
maximum for each output should be limited to 40 mA.
3: Output matching is calculated as the percent variation of (IMAX + IMIN) / 2.
4: VOUT should be regulated by user. See Figure 2-2 and Figure 2-3 for allowable VOUT vs. IOUT operation.
5: AC input waveform specification for test purpose: tR 200 ns, tF 20 ns, f = 500 kHz, 50% ±10% duty
cycle.
6: Clock input rise and fall times must not exceed 300 ns.
2016 Microchip Technology Inc.
DS20005651A-page 5


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Part Details

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