BQ4285_14 Datasheet, PDF (15/29 Pages) Texas Instruments – Real-Time Clock (RTC) With NVRAM Control

bq4285
Read/Write Timing (TA = TOPR, VCC = 5V ± 10%)
Symbol
tCYC
tDSL
tDSH
tRWH
tRWS
tCS
tCH
tDHR
tDHW
tAS
tAH
tDAS
tASW
tASD
tOD
tDW
tBUC
tPI
tUC
Parameter
Cycle time
DS low or RD/WR high time
DS high or RD/WR low time
R/W hold time
R/W setup time
Chip select setup time
Chip select hold time
Read data hold time
Write data hold time
Address setup time
Address hold time
Delay time, DS to AS rise
Pulse width, AS high
Delay time, AS to DS rise
(RD/WR fall)
Output data delay time from
DS rise (RD fall)
Write data setup time
Delay time before update
Periodic interrupt time interval
Time of update cycle
Minimum
160
80
55
0
10
5
0
0
0
20
5
10
30
35
-
30
-
-
-
Typical
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
244
-
1
Maximum
-
-
-
-
-
-
-
25
-
-
-
-
-
-
50
-
-
-
-
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
-
µs
Notes
See Table 3
15