S-77100 Datasheet, PDF (15/40 Pages) Seiko Instruments Inc – POWER SEQUENCER

Rev.1.0_01
POWER SEQUENCER
S-77100/77101 Series
(1) On-sequence period
ON
OFF(S-77101A(2) ENBL_A)
CDLY
ENBL_A
ENBL_B
ENBL_C
n times
2.5 V : I/O(1)
(1) Off-sequence period
n times
1.8 V : I/O(2)
1.5 V : LOGIC
tDLY1 tDLY1 tDLY1
(2) On-sequence period
ON (S-77101A(1) ENBL_C)
OFF
CDLY
ENBL_A
ENBL_B
ENBL_C
m times
2.5 V : I/O(1)
tDLY1 tDLY1 tDLY1
(2) Off-sequence period
m times
1.8 V : I/O(2)
1.5 V : LOGIC
tDLY2 tDLY2 tDLY2
tDLY2 tDLY2 tDLY2
_______
Figure 14 Timing Chart at Cascade Connection (S-77101A: Reverse Type, with OFF pin)
After the ON pin of S-77101A(1) changes from "L" to "H", the ENBL_A pin, the ENBL_B pin and the ENBL_C
pin of S-77101A(1) change to "H" in turn.
After the ENBL_C pin of S-77101A(1) changes from "L" to "H", the ENBL_A pin, the ENBL_B pin and the
ENBL_C pin of S-77101A(2) change to "H" in turn.
_______
After the OFF pin of S-77101A(2) changes from "H" to "L", the ENBL_C pin, the ENBL_B pin and the ENBL_A
pin of S-77101A(2) change to "L" in turn.
After the ENBL_A pin of S-77101A(2) changes from "H" to "L", the ENBL_C pin, the ENBL_B pin and the
ENBL_A pin of S-77101A(1) change to "L" in turn.
_______
Do not change the ON pin and the OFF pin during on-sequence period and off-sequence period in order to
perform the sequence operation normally.
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