Absolute Maximum Ratings

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Voltage at Any Pin

Operating Temperature

b

Storage Temperature

b

Power Dissipation

Junction Temperature

a

150 C

Lead Temperature

(Soldering 10 seconds)

300 C

DC Electrical Characteristics

Parameter

Conditions

Min

Typ

Max

Units

Power Supply

30

10

V

Power Supply Current

Outputs Open

9

15

m

A

17

25

m

A

35

45

m

A

15

25

m

A

Input Voltage Levels

Load Clock Data

Logic ‘‘0’’

09

V

Logic ‘‘1’’

24

V

Logic ‘‘0’’

04

V

Logic ‘‘1’’

20

V

Output Current Levels

Segments and Data Out

Sink

20

m

A

Source

20

m

A

BP OUT

Sink

320

m

A

Source

320

m

A

Symbol

Parameter

Min

Typ

Max

Units

500

kHz

Clock Period High

(Notes 1 2)

500

ns

Clock Period Low

500

ns

Data Set-Up before Clock

300

ns

Data Hold Time after Clock

100

ns

Minimum Load Pulse Width

500

ns

Load to Clock

400

ns

Clock to Data Valid

400

750

ns

Note 1

Note 2

Clock input rise and fall times must not exceed 300 ns

Note 3

Functional Description

A block diagram for the MM5483 is shown in

Figure 1 and a

package pinout is shown in

Figure 2 Figure 3 shows a pos-

sible 3-wire connection system with a typical signal format

for

Figure 3 Shown in Figure 4 the load input is an asyn-

chronous input and lets data through from the shift register

to the output buffers any time it is high The load input can

5 In the 2-wire control mode 31 bits (or less depending on

the number of segments used) of data are clocked into the

MM5483 in a short time frame (with less than 01 second

there probably will be no noticeable flicker) with no more

clocks until new information is to be displayed If data was

slowly clocked in it can be seen to ‘‘walk’’ across the dis-

play in the 2-wire mode An AC timing diagram can be seen

in

Figure 6 It should be noted that data out is not a TTL-

compatible output

2