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V55C2256164VB Rev. 1.0 April 2005
ProMOS TECHNOLOGIES
V55C2256164VB
AC Characteristics 1,2, 3
TA = 0 to 70 °C(Commercial)/-40 to 85 °C(Extended);VSS = 0 V; VCC= 2.5 V,VCCQ = 1.8V, tT=1 ns
#
Symbol Parameter
Limit Values
Unit
Note
-7
-8PC
-10
Min.
Max.
Min.
Max.
Min.
Max.
Clock and Clock Enable
1tCK
Clock Cycle Time
CAS Latency = 3
CAS Latency = 2
CAS Latency = 1
7
10
20
–
–
–
8
10
20
–
–
–
10
12
25
–
–
–
ns
ns
ns
2tCK
Clock Frequency
CAS Latency = 3
CAS Latency = 2
CAS Latency = 1
–
–
–
143
100
50
–
–
–
125
100
50
–
–
–
100
83
40
MHz
MHz
MHz
3tAC
Access Time from Clock
CAS Latency = 3
CAS Latency = 2
CAS Latency = 1
–
_
_
5.4
6
19
–
_
_
6
6
19
–
_
_
7
8
22
ns
ns
ns
2, 4
4tCH
Clock High Pulse Width
2.5
–
3
–
3
–
ns
5tCL
Clock Low Pulse Width
2.5
–
3
–
3
–
ns
6tT
Transition Tim
0.3
1.2
0.5
10
0.5
10
ns
Setup and Hold Times
7tIS
Input Setup Time
1.5
–
2
–
2.5
–
ns
5
8tIH
Input Hold Time
0.8
–
1
–
1
–
ns
5
9tCKS
Input Setup Time
1.5
–
2
–
2.5
–
ns
5
10
tCKH
CKE Hold Time
0.8
–
1
–
1
–
ns
5
11
tRSC
Mode Register Set-up Time
14
–
16
–
20
–
ns
12
tSB
Power Down Mode Entry Time
0
7
0
8
0
8
ns
Common Parameters
13
tRCD
Row to Column Delay Time
15
–
20
–
20
–
ns
6
14
tRP
Row Precharge Time
15
–
20
–
20
–
ns
6
15
tRAS
Row Active Time
42
100K
45
100k
50
100k
ns
6
16
tRC
Row Cycle Time
60
–
60
–
70
–
ns
6
17
tRRD
Activate(a) to Activate(b) Command
Period
14
–
16
–
20
–
ns
6
18
tCCD
CAS(a) to CAS(b) Command Period
1
–
1
–
1
–
CLK
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