DS1685 Maxim, DS1685 Datasheet - Page 27

• Manufacturer Part Number: DS1685
• Description: The DS1685/DS1687 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285,DS1385, DS1485, and DS1585 PC RTCs
• Manufacturer: Maxim

RTC AC TIMING CHARACTERISTICS
(V
AC TEST CONDITIONS
Output Load: 50pF
Input Pulse Levels: 0 to 3.0V
Timing Measurement Reference Levels
Input Pulse Rise and Fall Times: 5ns
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
CC
= 5.0V±10%, T
Input : 1.5V
Output: 1.5V
PARAMETER
A
= 0°C to +70°C, T
SYMBOL
PW
PW
PW
A
t
t
t
t
t
t
t
t
= -40°C to 85°C.)
R
t
t
ASED
t
t
DHW
DSW
CYC
t
DHR
DDR
AHL
ASD
ASL
IRD
CS
CH
, t
RWH
RWL
ASH
F
27 of 34
MIN
195
75
75
20
10
30
15
25
40
30
20
60
0
0
TYP
DS1685/DS1687 3V/5V Real-Time Clocks
MAX
DC
30
50
60
2
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
NOTES
6