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National
National

MM5451N Datasheet

LED Display Drivers


MM5451N Datasheet Preview


February 1995
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 VDD
Applications
Y COPSTM or microprocessor displays
Y Industrial control indicator
Y Relay driver
Y Digital clock thermometer counter voltmeter
Y Instrumentation readouts
Features
Y Continuous brightness control
Y Serial data input
Y No load signal required
Y Enable (on MM5450)
Y Wide power supply operation
Y TTL compatibility
Y 34 or 35 outputs 15 mA sink capability
Y Alphanumeric capability
Y iJA DIP
Board e 49 C W
Socket e 54 C W
Block Diagram
FIGURE 1
TL F 6136–1
COPSTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6136
RRD-B30M105 Printed in U S A
Page 1

Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Voltage at Any Pin
Operating Temperature
VSS b 0 3V to VSS a 12V
b25 C to a85 C
Storage Temperature
b65 C to a150 C
Junction Temperature
a150 C
Lead Temperature (Soldering 10 sec )
300 C
Power Dissipation at a25 C
Molded DIP Package Board Mount
2 5W
Molded DIP Package Socket Mount
2 3W
Molded DIP Package board mount iJA e 49 C W
Derate 20 4 mW C above 25 C
Molded DIP Package socket mount iJA e 54 C W
Derate 18 5 mW C above 25 C
Electrical Characteristics TA within operating range VDD e 4 75V to 11 0V VSS e 0V unless otherwise specified
Parameter
Conditions
Min Typ Max Units
Power Supply
4 75
11 V
Power Supply Current
Excluding Output Loads
7 mA
Input Voltages
Logical ‘‘0’’ Level (VL)
Logical ‘‘1’’ Level (VH)
Brightness Input (Note 2)
g10 mA Input Bias
4 75V s VDD s 5 25V
VDD l 5 25V
b0 3
22
VDD b 2V
0
08
VDD
VDD
0 75
V
V
V
mA
Output Sink Current
Segment OFF
Segment ON
VOUT e 3 0V
VOUT e 1V (Note 3)
Brightness Input e 0 mA
Brightness Input e 100 mA
Brightness Input e 750 mA
0
20
15
10
10
27 4
25
mA
mA
mA
mA
Brightness Input Voltage (Pin 19)
Input Current 750 mA
30
43 V
Output Matching (Note 1)
g 20
%
Clock Input
Frequency fC
High Time th
Low Time tl
(Notes 5 and 6)
950
950
500 kHz
ns
ns
Data Input
Set-Up Time tDS
Hold Time tDH
300 ns
300 ns
Data Enable Input
Set-Up Time tDES
100 ns
Note 1 Output matching is calculated as the percent variation (IMAX a IMIN) 2
Note 2 With a fixed resistor on the brightness input pin some variation in brightness will occur from one device to another Maximum brightness input current can
be 2 mA as long as Note 3 and junction temperature equation are complied with
Note 3 See Figures 5 6 and 7 for Recommended Operating Conditions and limits Absolute maximum for each output should be limited to 40 mA
Note 4 The VOUT voltage should be regulated by the user See Figures 6 and 7 for allowable VOUT vs IOUT operation
Note 5 AC input waveform specification for test purpose tr s 20 ns tf s 20 ns f e 500 kHz 50% g10% duty cycle
Note 6 Clock input rise and fall times must not exceed 300 ns
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
Top View
TL F 6136–2
Top View
FIGURE 2a
FIGURE 2b
Order Number MM5450N MM5451N MM5450V or MM5451V
See NS Package Number N40A or V44A
2
TL F 6136–3
Page 2

Connection Diagrams (Continued)
Plastic Chip Carrier
Top View
Plastic Chip Carrier
TL F 6136–13
Top View
3
TL F 6136–14
Page 3
Part Number MM5451N
Manufactur National
Description LED Display Drivers
Total Page 8 Pages
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