DS1385/DS1387
RTC AC TIMING CHARACTERISTICS
PARAMETER
Cycle Time
Pulse Width, RD/WR Low
Pulse Width, RD/WR High
Input Rise and Fall Time
Chip Select Setup Time Before
WR or RD
Chip Select Hold Time
Read Data Hold Time
Write Data Hold Time
Muxed Address Valid Time to
ALE Fall
Muxed Address Hold Time from
ALE Fall
RD or WR High Setup to ALE
Rise
Pulse Width ALE High
ALE Low Setup to RD or WR Fall
Output Data Delay Time from RD
Data Setup Time to Write
IRQ Release from RD
SYMBOL
t
CYC
PW
EH
PW
EL
t
R
, t
F
t
CS
t
CH
t
DHR
t
DHW
t
ASL
t
AHL
t
ASD
PW
ASH
t
ASED
t
DDR
t
DSW
t
IRD
20
0
10
0
30
10
25
60
40
20
100
MIN
305
125
150
TYP
(0°C to 70°C; V
CC
= 4.5V to 5.5V)
MAX
DC
UNITS
ns
ns
ns
30
ns
ns
ns
80
ns
ns
ns
ns
ns
ns
ns
120
ns
ns
2
µs
5
NOTES
012496 12/20
DALLAS [ DALLAS SEMICONDUCTOR ]
