National Semiconductor MM5452, MM5453 Technical data

MM5452/MM5453 Liquid Crystal Display Drivers

Y

General Description

The MM5452 is a monolithic integrated circuit utilizing
CMOS metal gate, low threshold enhancement mode devic­es. It is available in a 40-pin molded package. The chip can
drive up to 32 segments of LCD and can be paralleled to
increase this number. The chip is capable of driving a 4 (/2­digit 7-segment display with minimal interface between the
display and the data source.

The MM5452 stores display data in latches after it is
clocked in, and holds the data until new display data is re­ceived.

Features

Y

Serial data input

Y

No load signal required

Block Diagram

DATA ENABLE (MM5452)

Y

Wide power supply operation

Y

TTL compatibility

Y

32 or 33 outputs

Y

Alphanumeric and bar graph capability

Y

Cascaded operation capability

Applications

Y

COPSTMor microprocessor displays

Y

Industrial control indicator

Y

Digital clock, thermometer, counter, voltmeter

Y

Instrumentation readouts

Y

Remote displays

MM5452/MM5453 Liquid Crystal Display Drivers

February 1995

FIGURE 1

TL/F/6137– 1

COPSTMis a trademark of National Semiconductor Corp.

C

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

TL/F/6137

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

SS

Operating Temperature 0§Ctoa70§C

to V

a

10V

SS

Storage Temperature

Power Dissipation 300 mW ata70§C

Junction Temperature

b

65§Ctoa150§C

350 mW at

a

a

25§C

150§C

Lead Temperature (Soldering, 10 sec.) 300§C

Electrical Characteristics

TAwithin operating range, V

DD

e

3.0V to 10V, V

Parameter Conditions Min Typ Max Units

Power Supply 3 10 V

Power Supply Current Excluding Outputs

e

OSC

VSS,BPIN@32 Hz 40 mA

e

V

5V, Open Outputs, No Clock 10 mA

DD

Clock Frequency 500 kHz

Input Voltages

Logical ‘0’ Level V

Logical ‘1’ Level V

k

4.75

DD

t

V

4.75

DD

l

5.25 0.8 V

DD

s

V

5.25 2.0 V

DD

Output Current Levels

Segments

Sink V
Source V

Backplane

Sink V
Source V

DD

DD

DD

DD

e

3V, V

e

3V, V

e

3V, V

e

3V, V

Output Offset Voltage Segment Load 250 pF

Backplane Load 8750 pF (Note 1)

Clock Input Frequency, f

High Time, t

Low Time, t

h

l

(Notes 2 and 3) 500 kHz

C

Data Input

Set-Up Time, t
Hold Time, t

DS

DH

Data Enable Input

Set-Up Time, t

Note 1: This parameter is guaranteed (not 100% production tested) over operating temperature and supply voltage ranges. Not to be used in Q.A. testing.

Note 2: AC input waveform for test purpose: t

Note 3: Clock input rise and fall times must not exceed 300 ns.

DES

r

s

20 ns, t

e

0V, unless otherwise specified

SS

e

0.3V

OUT

e

b

V

OUT

e

OUT

e

OUT

s

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

f

0.3V 20 mA

DD

0.3V

b

V

0.3V 320 mA

DD

b

0.3 0.1 V

b

0.3 0.8 V

DD

DD

V

DD

DD

b

20 mA

b

320 mA

g

50 mV

950 ns

950 ns

300 ns
300 ns

100 ns

V

V
V

2

Connection Diagrams

Dual-In-Line Package

Dual-In-Line Package

Top View

TL/F/6137– 2

FIGURE 2a

Plastic Chip Carrier

TL/F/6137– 11

Top View

Order Number MM5452N, MM5453N,

MM5452V or MM5453V

See NS Package Number N40A or V44A

Functional Description

The MM5452 is specifically designed to operate 4 (/2-digit 7­segment 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 2 signals, serial data
and clock. Since the MM5452 does not contain a character
generator, the formatting of the segment information must
be done prior to inputting the data to the MM5452. Using a
format of a leading ‘‘1’’ followed by the 32 data bits allows
data transfer without an additional load signal. The 32 data

Top View

FIGURE 2b

Plastic Chip Carrier

Top View

bits are latched after the 36th clock is complete, thus pro­viding non-multiplexed, direct drive to the display. Outputs
change only if the serial data bits differ from the previous
time.

A block diagram is shown in
DATA ENABLE
DATA ENABLE
be brought out. This is the MM5453 device.

is used instead of the 33rd output. If the

signal is not required, the 33rd output can

Figure 1.

TL/F/6137– 3

TL/F/6137– 12

For the MM5452 a

3