DS1495 Datasheet, PDF (14/19 Pages) Dallas Semiconductor – RAMified Real Time Clock

DS1495/DS1497
BUS TIMING
PARAMETER
SYM
MIN
Cycle Time
Pulse Width, RD/WR Low
Signal Rise and Fall Time, RTC,
XRAM, RD, WR
t_CYC
395
PW_RWL
200
t_R, t_F
Address Hold Time
t_AH
20
Address Setup Time Before RD
t_ARS
50
Address Setup Time Before WR
t_AWS
0
RTC/XRAM Select Setup Time Be-
t_CRS
50
fore RD
RTC/XRAM Select Setup Time Be-
t_CWS
0
fore WR
RTC/XRAM Select Hold Time After
t_CH
20
RD or WR
Read Data Hold Time
t_DHR
10
Write Data Hold Time
t_DHW
0
Output Data Delay Time from RD
t_DDR
20
Write Data Setup Time
t_DSW
200
OUTPUT LOAD
(0°C to 70°C; V_DD = 4.5V to 5.5V)
TYP
MAX
UNIT NOTES
DC
ns
ns
30
ns
ns
ns
ns
ns
ns
ns
100
ns
ns
200
ns
ns
+5 V
D.U.T.
680Ω
1.1KΩ
50 pF
020894 14/19