MM5483N National Semiconductor, MM5483N Datasheet - Page 4

• Manufacturer Part Number: MM5483N
• Manufacturer: National Semiconductor

Specifications of MM5483N

• Operating Supply Voltage (typ): 3.3/5/9V
• Number Of Digits: 4.5
• Number Of Segments: 31
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: PDIP
• Pin Count: 40
• Mounting: Through Hole
• Power Dissipation: 350mW
• Frequency (max): 500KHz
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 10V
• Lead Free Status / Rohs Status: Not Compliant

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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 asynchronous
input and lets data through from the shift register to the output
buffers any time it is high. The load input can be connected
to V
DD
for 2-wire control as shown in Figure 5. In the 2-wire
FIGURE 3. Three-Wire Control Mode
FIGURE 4. Data Format Diagram
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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 0.1 second there probably will
be no noticeable flicker) with no more clocks until new infor-
mation is to be displayed. If data was slowly clocked in, it can
be seen to “walk” across the display 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.
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