MM5452N National Semiconductor, MM5452N Datasheet - Page 4

• Manufacturer Part Number: MM5452N
• Description: LCD DRIVER, 33 SEGMENT, 5452, DIP40
• Manufacturer: National Semiconductor

Specifications of MM5452N

• Module Configuration: CMOS
• Supply Current: 40µA
• No. Of Segments: 32
• Meter Display Type: LCD
• Supply Voltage Range: 3V To 10V
• Driver Case Style: DIP
• No. Of Pins: 40
• Operating Temperature Range: -40°C
• No. Of Digits / Alpha: 4.1/2
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4 shows the input data format A start bit of logical
Functional Description
‘‘1’’ precedes the 32 bits of data At the 36th clock a LOAD
signal is generated synchronously with the high state of the
clock which loads the 32 bits of the shift registers into the
latches At the low state of the clock a RESET signal is
generated which clears all the shift registers for the next set
of data The shift registers are static master-slave configura-
tion There is no clear for the master portion of the first shift
register thus allowing continuous operation
(Continued)
FIGURE 4 Input Data Format
FIGURE 3
4
Figure 2a shows the pin-out of the MM5452 Bit 1 is the first
Figure 3 shows the timing relationships between data clock
If the clock is not continuous there must be a complete set
of 36 clocks otherwise the shift registers will not clear
bit following the start bit and it will appear on pin 18
and DATA ENABLE
TL F 6137 – 4
TL F 6137– 5