
W981616BH
- 12 -
AC CHARACTERISTICS
(V
CC
= 3.3V
±
0.3V, V
SS
= 0V, T
A
= 0 to 70
°
C, Notes: 5, 6, 7, 8)
PARAMETER
SYM.
-5
-6
-7(L)
UNIT
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
Ref/Active to Ref/Active Command Period
t
RC
54
70
72
nS
Active to Precharge Command Period
t
RAS
40
100000
48
100000
48
100000
Active to Read/Write Command Delay
Time
t
RCD
14
20
20
Read/Write(a) to Read/Write(b)Command
Period
t
CCD
1
1
1
Cycle
Precharge to Active(b) Command Period
t
RP
14
20
20
nS
Active(a) to Active(b) Command Period
t
RPD
10
14
16
Write Recovery Time
CL* = 2
t
WR
7
8
10
CL* = 3
5
6
7
CLK Cycle Time
CL* = 2
t
CK
7
1000
8
1000
10
1000
CL* = 3
5
1000
6
1000
7
1000
CLK High Level Width
t
CH
2
2
2
CLK Low Level Width
t
CL
2
2
2
Access Time from CLK
CL* = 2
t
AC
4.5
5.5
5.5
CL* = 3
4.5
5
5
Output Data Hold Time
t
OH
2.75
2.75
3
Output Data High Impedance Time
t
HZ
2.75
5
2.75
6
3
7
Output Data Low Impedance Time
t
LZ
0
0
0
Power Down Mode Entry Time
t
SB
0
5
0
6
0
7
Transition Time of CLK (Rise and Fall)
t
T
0.5
10
0.5
10
0.5
10
Data-in-Set-up Time
t
DS
1.5
1.5
1.5
Data-in Hold Time
t
DH
1
1
1
Address Set-up Time
t
AS
1.5
1.5
1.5
Address Hold Time
t
AH
1
1
1
CKE Set-up Time
t
CKS
1.5
1.5
1.5
CKE Hold Time
t
CKH
1
1
1
Command Set-up Time
t
CMS
1.5
1.5
1.5
Command Hold Time
t
CMH
1
1
1
Refresh Time
t
REF
64
64
64
mS
Mode Register Set Cycle Time
t
RSC
10
12
14
nS
(L):For low power