Ac characteristics and operating condition – Rainbow Electronics W9825G6CH User Manual
Page 6
W9825G6CH
- 6 -
AC CHARACTERISTICS AND OPERATING CONDITION
(Vcc = 3.3V
±
0.3V, Ta = 0 to 70°C for –6/-7/-75/75L, Ta=-40 to 85°C for 75I ; Notes: 5, 6, 7, 8)
PARAMETER
SYM.
-7
(PC133, CL2)
-75/75L/75I
(PC133, CL3)
UNIT
MIN.
MAX.
MIN.
MAX.
Ref/Active to Ref/Active Command Period
t
RC
56
65
nS
Active to precharge Command Period
t
RAS
40
100000
45
100000
nS
Active to Read/Write Command Delay Time
t
RCD
15
20
nS
Read/Write(a) to Read/Write(b) Command
Period
t
CCD
1
1
tCK
Precharge to Active Command Period
t
RP
15
20
nS
Active(a) to Active(b) Command Period
t
RRD
15
15
nS
Write Recovery Time
CL* = 2
t
WR
2
2
tCK
CL* = 3
2
2
tCK
CLK Cycle Time
CL* = 2
t
CK
7.5
1000
10
1000
nS
CL* = 3
7
1000
7.5
1000
nS
CLK High Level Width
t
CH
2.5
2.5
nS
CLK Low Level Width
t
CL
2.5
2.5
nS
Access Time from CLK
CL* = 2
t
AC
5.4
6
nS
CL* = 3
5.4
5.4
nS
Output Data Hold Time
t
OH
3
3
nS
Output Data High Impedance Time
t
HZ
3
7
3
7.5
nS
Output Data Low Impedance Time
t
LZ
0
0
nS
Power Down Mode Entry Time
t
SB
0
7
0
7.5
nS
Transition Time of CLK
(Rise and Fall)
t
T
0.5
10
0.5
10
nS
Data-in Set-up Time
t
DS
1.5
1.5
nS
Data-in Hold Time
t
DH
0.8
0.8
nS
Address Set-up Time
t
AS
1.5
1.5
nS
Address Hold Time
t
AH
0.8
0.8
nS
CKE Set-up Time
t
CKS
1.5
1.5
nS
CKE Hold Time
t
CKH
0.8
0.8
nS
Command Set-up Time
t
CMS
1.5
1.5
nS
Command Hold Time
t
CMH
0.8
0.8
nS
Refresh Time
t
REF
64
64
mS
Mode register Set Cycle Time
t
RSC
14
15
nS
*CL = CAS Latency