Real-Time Clock
5/DS12C87A
Intel Bus Read Timing
t
CYC
PW
ASH
AS
t
ASD
t
ASED
DS
PW
EL
PW
EH
t
ASD
R/W
t
CH
t
CS
CS
t
t
t
DHR
t
ASL
DDR
AHL
AD0–AD7
IRQ Release Delay Timing
DS
RESET
t
RWL
IRQ
t
IRR
t
IRDS
Power-Up/Power-Down Timing
V
CC
V
PF(MAX)
V
PF(MIN)
t
F
t
R
t
RPU
t
DR
DON'T CARE
HIGH-Z
RECOGNIZED
VALID
RECOGNIZED
VALID
INPUTS
OUTPUTS
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5