BQ3285EC Datasheet, PDF (18/26 Pages) Texas Instruments – Real-Time Clock (RTC)

bq3285EC/LC
Read/Write Timing—bq3285LC (T_A = T_OPR, V_CC = 3V ± 10%)
Symbol
Parameter
Minimum Typical Maximum
tCYC
Cycle time
270
-
-
tDSL
DS low or RD/WR high time
135
-
-
tDSH
DS high or RD/WR low time
90
-
-
tRWH
R/W hold time
0
-
-
tRWS
R/W setup time
15
-
-
tCS
Chip select setup time
8
-
-
tCH
Chip select hold time
0
-
-
tDHR
Read data hold time
0
-
40
tDHW
Write data hold time
0
-
-
tAS
Address setup time
30
-
-
tAH
Address hold time
15
-
-
tDAS
Delay time, DS to AS rise
15
-
-
tASW
Pulse width, AS high
50
-
-
tASD
Delay time, AS to DS rise (RD/WR fall)
55
-
-
Output data delay time from DS rise
tOD
(RD fall)
-
-
100
tDW
Write data setup time
50
-
-
tBUC
Delay time before update cycle
-
244
-
tPI
Periodic interrupt time interval
-
-
-
tUC
Time of update cycle
-
1
-
Unit
Notes
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
-
See Table 3
µs
July 1996
18