A-Data
ADS7608A4A
AC Characteristics
-5
-5.5
-6
-7
-7.5
Parameter
Symbol
Unit Note
Min Max Min Max Min Max Min Max Min Max
System clock /CAS Latency = 3 tCK3
Cycle time
5
10
2
5.5
10
6
10
2.5
2.5
-
7
10
2.5
2.5
-
7.5
7.5
2.5
2.5
-
1000
1000
1000
1000
1000 ns
/CAS Latency = 2 tCK2
Clock high pulse width
Clock low pulse width
tCHW
tCLW
-
-
2.25
2.25
-
-
-
-
-
-
-
-
ns
ns
1
1
2
-
5.4
5.4
-
Access time /CAS Latency = 3 tAC3
-
4.5
6
-
5
6
-
5.4
6
-
5.4
6
-
ns
2
form clock
/RAS cycle
time
/CAS Latency = 2 tAC2
-
-
-
-
-
Operation
tRC
55
55
15
55
60
60
18
62
62
20
65
65
15
ns
ns
Auto Refresh
tRRC
tRCD
tRAS
tRP
-
55
-
-
-
-
/RAS to /CAS delay
-
16.5
-
-
-
-
/RAS active time
40 100K 38.5 100K 42 100K 42 120K 45 120K ns
/RAS precharge time
/RAS to /RAS bank active delay
/CAS to /CAS delay
15
10
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
16.5
11
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
18
12
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
20
14
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
15
15
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
tRRD
tCCD
CLK
CLK
CLK
CLK
CLK
CLK
ns
Write command to data – in delay tWTL
Data – in to precharge command tDPL
0
0
0
0
0
1
1
1
1
1
Data – in active command
DQM to data – out Hi-Z
DQM to data – in mask
Data – out hold time
Data – input setup time
Data – input hold time
Address setup time
Address hold time
tDAL
tDQZ
tDQM
tOH
5
5
5
4
4
2
2
2
2
2
0
0
0
0
0
1.5
1.5
1
2
2.7
1.5
1
2.7
1.5
1
2.7
1.5
1
tDS
1.5
1
ns
1
1
1
1
1
1
1
1
tDH
ns
tAS
1.5
1
1.5
1
1.5
1
1.5
1
1.5
1
ns
tAH
ns
CKE setup time
tCKS
tCKH
tCS
1.5
1
1.5
1
1.5
1
1.5
1
1.5
1
ns
CKE hold time
ns
Command setup time
Command hold time
CLK to data output in low Z-time
MRS to new command
Power down exit time
Self refresh exit time
Refresh time
1.5
1
1.5
1
1.5
1
1.5
1
1.5
1
ns
tCH
ns
tOLZ
tMRD
tPDE
tSRE
tREF
1
1
1
1.5
1
1.5
1
ns
2
2
2
CLK
CLK
CLK
ms
1
1
1
1
1
1
1
1
1
1
3
64
64
64
64
64
Note : 1. Assume tR / tF (input rise and fall time) is 1 ns.
2. Access times to be measured with input signals of 1v / ns edge rate.
3.A new command can be given tRRC after self refresh exit.
Rev 1 April, 2001
6
ADATA [ ADATA Technology Co., Ltd. ]
