LC7574NW View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

View to exact match

LC7574NW

1/2 Duty VFD Driver for Frequency Display

SANYO -> Panasonic 

LC7574NE, 7574NW

BLK and the Display Control

Since the LSI internal data (SD1 to SD74 and the control data) is undefined when power is first applied, the display is

off (G1 and G2 = low) by setting the BLK pin low at the same time as power is applied. Then, meaningless display at

power on can be prevented by transferring all 92 bits of serial data from the controller while the display is off and setting

BLK pin high after the transfer completes. (See Figure 3.)

Power Supply Sequence

The following sequences must be observed when power is turned on and off. (See Figure 3)

• Power on: Logic block power supply (VDD) on → Driver block power supply (VFL) on

• Power off: Driver block power supply (VFL) off → Logic block power supply (VDD) off

Output Waveforms (S1 to S37)

Figure 3

No. 3586-7/10

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