DS1689 Datasheet, PDF (25/32 Pages) Dallas Semiconductor – 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control

DS1689/DS1693 BUS TIMING FOR READ CYCLE TO RTC
DS1689/DS1693
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
IRQ Release from RD
CEI to CEO Delay
SYMBOL
t_CYC
PW_RWL
PW_RWH
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
t_CED
Over the operating range (5V)
MIN TYP MAX UNITS NOTES
305
DC ns
125
ns
150
ns
30
ns
20
ns
0
ns
10
80
ns
0
ns
30
ns
10
ns
25
ns
60
ns
40
ns
20
120 ns
9
100
ns
2
ms
10
ns
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