National Semiconductor MM5486 Technical data

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MM5486 LED Display Driver

General Description

The MM5486 is a monolithic MOS integrated circuit utilizing
N-channel metal-gate low-threshold, enhancement mode
and ion-implanted depletion mode devices. It is available in
a 40-pin molded dual-in-line package. The MM5486 is de­signed to drive common anode-separate cathode LED dis­plays. A single pin controls the LED display brightness by
setting a reference current through a variable resistor con­nected to V

Features

Y

Continuous brightness control

Y

Serial data input/outut

Block and Connection Diagrams

DD

.

Y

External load input

Y

Cascaded operation capability

Y

Wide power supply operation

Y

TTL compatibility

Y

33 outputs, 15 mA sink capability

Y

Alphanumeric capability

Applications

Y

COPSTMor microprocessor displays

Y

Industrial control indicator

Y

Relay driver

Y

Digital clock, thermometer, counter, voltmeter

Y

Instrumentation readouts

Dual-In-Line Package

MM5486 LED Display Driver

February 1995

FIGURE 1

TL/F/6142– 1

Top View

TL/F/6142– 2

Order Number MM5486N

See NS Package Number N40A

FIGURE 2

Order Number MM5486V

TL/F/6142– 13

See NS Package Number V44A

COPSTMis a trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/6142

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 V

Operating Temperature

Storage Temperature

SS

b

b

65§Ctoa150§C

a

to V

12V

SS

25§Ctoa85§C

Power Dissipation at 25

Molded DIP Package, Board Mount 2.5W*

C

§

Molded DIP Package, Socket Mount 2.3W**

Junction Temperature

a

150§C

Lead Temperature (Soldering, 10 seconds) 300§C

*Molded DIP Package, Board Mount, i

C.

above 25

§

**Molded DIP Package, Socket Mount, i

C.

above 25

§

e

49§C/W, Derate 20.4 mW/§C

JA

e

54§C/W, Derate 18.5 mW/§C

JA

Electrical Characteristics

TAwithin operating range, V

e

4.75V to 11.0V, V

DD

Symbol Parameter Conditions Min Typ Max Units

V

DD

I

DD

Power Supply 4.75 11 V

Power Supply Current Excluding Output Loads 7 mA

Input Voltages

V

IL

V

IH

I

BR

Logic ‘‘0’’ Level
Logic ‘‘1’’ Level 4.75sV

Brightness Input (Note 2) 0 0.75 mA

Output Sink Current (Note 3)

I

OH

I

OL

I

O

V

IBR

Segment OFF V
Segment ON V

Maximum Segment Current 40 mA

Brightness Input Voltage (Pin 19) Input Currente750 mA 3.0 4.3 V

OM Output Matching (Note 1)

Data Output

V

OL

V

OH

Logical ‘‘0’’ Level I
Logical ‘‘1’’ Level I

Clock Input (Notes 5 and 6)

f

C

t

h

t

l

Frequency 500 kHz
High Time 950 ns
Low Time 950 ns

Data Input

t

DS

t

DH

Note 1: Output matching is calculated as the percent variation (I

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: Absolute maximum for each output should be limited to 40 mA.

Note 4: The V

Note 5: AC input waveform specification for test purpose: t

Note 6: Clock input rise and fall times must not exceed 300 ns.

Set-Up Time 300 ns
Hold Time 300 ns

voltage should be regulated by the user. See

OUT

e

0V, unless otherwise specified

SS

g

10 mA Input Bias

V

DD

OUT

OUT

Brightness Input

s

5.25 2.2 V

DD

l

5.25 V

e

3.0V 10 mA

e

1V (Note 4)

e

0 mA0 10mA

b

0.3 0.8 V

b

2VDDV

DD

Brightness Inpute100 mA 2.0 2.7 4 mA
Brightness Input

OUT

OUT

MAX

Figures 6

s

20 ns, t

r

e
e

a

I

)/2.

MIN

and7for allowable V

s

20 ns, fe500 kHz, 50%g10% duty cycle.

f

e

750 mA15 25mA

0.5 mA V
100 mA 2.4 V

vs I

OUT

OUT

SS

operation.

g

DD

20 %

0.4 V

DD

V

V

2

Functional Description

The MM5486 is specifically designed to operate four-digit
alphanumeric displays with minimal interface with the dis­play and the data source. Serial data transfer from the data
source to the display driver is accomplished with 3 signals,
serial data, clock, and load. The data bits are latched by a
positive-level load signal, thus providing non-multiplexed, di­rect drive to the display. When load is high, the data in the
shift registers is displayed on the output drivers. Outputs
change only if the serial data bits differ from the previous
time. Display brightness is determined by control of the out­put current for LED displays. A 0.001 mF capacitor should
be connected to brightness control, pin 19, to prevent possi­ble oscillations. The output current is typically 20 times
greater than the current into pin 19, which is set by an exter­nal variable resistor. There is an internal limiting resistor of
400X nominal value.

A block diagram is shown in

Figure 4

shows the input data format. Bit ‘‘1’’ is the first bit
into the data input pin and it will appear on pin 17. A logical
‘‘1’’ at the input will turn on the appropriate LED. The load
signal latches the 33 bits of the shift register into the latch­es. The data out pin allows for cascading the shift registers
for more than 33 output drivers.

Figure 1

.

When the chip first powers ON, an internal power ON reset
signal is generated which resets all registers and latches.
The leading clock returns the chip to its normal operation.

Figure 3

shows the timing relationship between data, clock
and data enable. A maximum clock frequency of 0.5 MHz is
assumed.

For applications where a lesser number of outputs are used,
it is possible to either increase the current per output, or
operate the part at higher than 1V V
equation can be used for calculations:

e

T

(V

)(I

J

OUT

) (No. of segments) (iJA)aT

LED

. The following

OUT

A

where:

e

T

junction temperature, 150§C max.

J

e

V

the voltage at the LED driver outputs

OUT

e

I

the LED current

LED

e

thermal coefficient of the package

i

JA

e

T

ambient temperature

A

iJA(Socket Mount)e54§C/W

iJA(Board Mount)e49§C/W

The above equation was used to plot

Figure 8

.

Figure 6, Figure 7,

and

*This leading clock is necessary only after power ON.

FIGURE 4. Input Data Format

FIGURE 3

TL/F/6142– 3

TL/F/6142– 4

TL/F/6142– 5

FIGURE 5

3

Typical Applications

FIGURE 6

TL/F/6142– 6

DV

e

I

19

1k

FIGURE 7

FIGURE 9. Constant Current Brightness Control

TL/F/6142– 7

FIGURE 8

TL/F/6142– 8

TL/F/6142– 9

FIGURE 10. Brightness Control Varying the Duty Cycle

4

TL/F/6142– 10

Typical Applications (Continued)

Basic Electronically Tuned Radio System

TL/F/6142– 11

Duplexing 8 Digits with One MM5486

*This driver has 7 segments only.

TL/F/6142– 12

5

6

Physical Dimensions inches (millimeters)

Molded Dual-In-Line Package (N)

Order Number MM5486

NS Package Number N40A

7

Physical Dimensions inches (millimeters) (Continued)

MM5486 LED Display Driver

44-Lead Plastic Chip Carrier (V)

Order Number MM5486V

NS Package Number V44A

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

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Corporation Europe Hong Kong Ltd. Japan Ltd.

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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