DS1385 Datasheet, PDF (12/20 Pages) Dallas Semiconductor – RAMified Real Time Clock 4K x 8

DS1385/DS1387
RTC AC TIMING CHARACTERISTICS
PARAMETER
SYMBOL MIN
Cycle Time
t_CYC
305
Pulse Width, RD/WR Low
PW_EH
125
Pulse Width, RD/WR High
PW_EL
150
Input Rise and Fall Time
t_R, t_F
Chip Select Setup Time Before
t_CS
20
WR or RD
Chip Select Hold Time
Read Data Hold Time
Write Data Hold Time
Muxed Address Valid Time to
ALE Fall
t_CH
0
t_DHR
10
t_DHW
0
t_ASL
30
Muxed Address Hold Time from
t_AHL
10
ALE Fall
RD or WR High Setup to ALE
Rise
t_ASD
25
Pulse Width ALE High
PW_ASH
60
ALE Low Setup to RD or WR Fall
t_ASED
40
Output Data Delay Time from RD
t_DDR
20
Data Setup Time to Write
t_DSW
100
IRQ Release from RD
t_IRD
(0°C to 70°C; V_CC = 4.5V to 5.5V)
TYP
MAX
UNITS NOTES
DC
ns
ns
ns
30
ns
ns
ns
80
ns
ns
ns
ns
ns
ns
ns
120
ns
5
ns
2
µs
012496 12/20