Instruction Manual

W9864G2GH
- 16 -
12. AC CHARACTERISTICS
(V
CC
= 3.3V±0.3V, V
SS
= 0V, Ta = 0 to 70 °C for -5/-6/-7) (Notes: 5, 6.)
-5 -6 -7
PARAMETER SYM.
MIN. MAX. MIN. MAX. MIN. MAX.
UNIT NOTE
Ref/Active to Ref/Active
Command Period
tRC 55 60 65
Active to precharge
Command Period
tRAS 40 100000 42 100000 45 100000
Active to Read/Write
Command Delay Time
tRCD 15 18 20
nS
Read/Write(a) to Read/
Write(b) Command
Period
tCCD 1 1 1 tCK
Precharge to Active(b)
Command Period
tRP 15 18 20
Active(a) to Active(b)
Command Period
tRRD 10 12 14
nS
Write Recovery Time
CL* = 2
CL* = 3
tWR 2 2 2 tCK
CLK Cycle Time
CL* = 2
tCK 10 1000 10 1000 10 1000
CL* = 3
5 1000 6 1000 7 1000
CLK High Level
tCH 2 2 2
CLK Low Level
tCL 2 2 2
Access Time from CLK
CL* = 2
tAC
－
6 6
CL* = 3
4.5 5 5.5
Output Data Hold Time
tOH 2 2 2
Output Data High
Impedance Time
tHZ 2 5 2 6 2 7
Output Data Low
Impedance Time
tLZ 0 0 0
Power Down Mode
Entry Time
tSB 0 5 0 6 0 7
Transition Time of CLK
(Rise and Fall)
tT 0.5 5 0.5 5 0.5 5
Data-in-Set-up Time
tDS 1.5 1.5 1.5
Data-in Hold Time
tDH 1 1 1
Address Set-up Time
tAS 1.5 1.5 1.5
Address Hold Time
tAH 1 1 1
CKE Set-up Time
tCKS 1.5 1.5 1.5
CKE Hold Time
tCKH 1 1 1
Command Set-up Time
tCMS 1.5 1.5 1.5
Command Hold Time
tCMH 1 1 1
nS
Refresh Time
tREF 64 64 64 mS
Mode Register Set
Cycle Time
tRSC 10 12 14 nS