S-77100 Datasheet, PDF (19/40 Pages) Seiko Instruments Inc – POWER SEQUENCER

Rev.1.0_01
POWER SEQUENCER
S-77100/77101 Series
3. 1. 3 Operation when connecting VDD pin and ON pin
The on-sequence operation is performed automatically when connecting the VDD pin and the ON pin and the
power supply is raised. However, since the ENBL_x pins all change to "L" if VDD is equal to or lower than VUVLO
when the power supply is fallen, the off-sequence operation timing is not guaranteed. The operation example is
shown in Figure 20.
VDD, ON
CDLY
ENBL_A
ENBL_B
ENBL_C
ENBL_D
Figure 20
VUVLO
VSS
19