DS17285(1998) View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
Part Name
Description
Manufacturer
DS17285 Datasheet PDF : 32 Pages
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DS17285/DS17287
RTC AC TIMING CHARACTERISTICS
PARAMETER
SYMBOL MIN
Cycle Time
tCYC
240
Pulse Width, RD/WR Low
PWRWL
120
Pulse Width, RD/WR High
PWRWH
80
Input Rise and Fall Time
tR, tF
Chip Select Setup Time Before
tCS
20
WR, or RD
Chip Select Hold Time
tCH
0
Read Data Hold Time
tDHR
10
Write Data Hold Time
tDHW
0
Muxed Address Valid Time to ALE tASL
20
Fall
Muxed Address Hold Time from
tAHL
10
ALE fall
RD or WR High Setup to ALE
Rise
tASD
25
Pulse Width ALE High
PWASH
40
ALE Low Setup to RD or WR Fall tASED
30
Output Data Delay Time from RD
tDDR
20
Data Setup Time
tDSW
30
IRQ Release from RD
tIRD
(0°C to 70°C; VCC = 5.0V ± 10%)
TYP
MAX
UNITS NOTES
DC
ns
ns
ns
30
ns
ns
ns
50
ns
ns
ns
ns
ns
ns
ns
120
ns
7
ns
2
µs
DS17285/DS17287 BUS TIMING FOR WRITE CYCLE TO RTC AND RTC REGISTERS
ALE
tASD
PWASH
tASED
tCYC
PWRWH
WR
tASD
PWRWL
RD
CS
AD0–AD7
tCS
tASL
tAHL
tDSW
tCH
tDHW
030598 23/32
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