DS17885 Dallas, DS17885 Datasheet - Page 27

• Manufacturer Part Number: DS17885
• Description: (DS17886 / DS17887) 3V/5V Real-Time Clock
• Manufacturer: Dallas

RTC AC TIMING CHARACTERISTICS
AC TEST CONDITIONS
Output Load: 50pF
Input Pulse Levels: 0V to 3.0V
Timing Measurement Reference Levels
Input Pulse Rise and Fall Times: 5ns
Cycle Time
Pulse-Width,
Pulse-Width,
Input Rise and Fall
Chip-Select Setup Time
Before
Chip-Select Hold Time
Read Data Hold Time
Write Data Hold Time
Muxed Address Valid Time to
ALE Fall
Muxed Address Hold Time to
ALE Fall
ALE Rise
Pulse-Width ALE High
ALE Low Setup to
Fall
Output Data-Delay Time from
Data Setup Time
IRQ
RD
RD
Input: 1.5V
Output: 1.5V
or
Release from
PARAMETER
WR
WR
High Setup to
or
RD
RD
RD
/
/
WR
WR
RD
RD
Low
High
or
WR
SYMBOL
PW
PW
PW
t
t
t
t
t
t
t
t
t
t
ASED
t
R
DHW
t
DSW
CYC
t
DHR
DDR
AHL
ASD
ASL
IRD
CH
CS
, t
RWH
RWL
ASH
F
MIN
360
200
150
20
10
40
10
30
40
30
20
70
0
0
27 of 38
TYP
Over the operating range (3V)
MAX
200
DC
30
90
2
UNITS
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
6