W3DG6430V-D2 Datasheet, PDF (5/6 Pages) White Electronic Designs Corporation – 256MB - 32M x 64 BUFFERED SDRAM MODULE

White Electronic Designs
W3DG6430V-D2
PRELIMINARY
AC CHARACTERISTICS
Paramater
Access time from CLK
Address hold time
Address setup time
CLK high level width
CLK low level width
Clock cycle time
CKE hold time
CKE setup time
CS, RAS, CAS, WE, DQM hold time
CS, RAS, CAS, WE, DQM setup time
Data-in hold time
Data-in setup time
Data-out high-impedance time
Data-out low-impedance time
Data-out hold time (load)
Data-out hold time (no load)
Active to Precharge command
Active to Active command period
Active to Read or Write delay
Refresh period
Auot refresh period
Precharge command period
Active bank a to Active bank b command
Transition time
CL = 2
CL = 2
CL = 2
Symbol
tAC
tAH
tAS
tCH
tCL
tCK
tCKH
tCKS
tCMH
tCMS
tDH
tDS
tHZ
tLZ
tOH
tN
tRAS
tRC
tRCD
tREF
tRFC
tRP
tRRD
tT
Write recovery time
tWR
Exit Self Refresh to Active command
tXSR
Notes:
1. The clock frequency must remain constant ( stable clock is defined as a signal cycling within
timing constraints specified for the clock pin) during access or precharge states (READ,
WRITE, including WR and Precharge commands). CKE may be used to reduce the data rate.
2. tHZ defines the time at which the output achieves the open circuit condition; it is not a reference
to VOH or VOL. The last valid data element will meet tOH before going High-Z.
3. Paramater guaranteed by design
4. AC characteristics assume tT = 1ns
5. Auto precharge mode only) The precharge timing budget ( tRP) begins 7ns after the first clock
delay, after the last Write is executed.
6. Precharge mode only.
7. CLK must be toggled a minimum of two times during this period.
133MHz component timing
Min
0.8
1.5
2.5
2.5
7.5
0.8
1.5
0.8
1.5
0.8
1.5
1
3
1.8
37
60
15
66
15
14
0.3
1 CLK + 7ns
Max
5.4
5.4
120,000
64
1.2
67
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
Notes
1
2
3
4
5
6
7
Address hold time
Address setup time
CS, RAS, CAS, WE, DQM hold time
CS, RAS, CAS, WE, DQM setup time
MODULE AC CHARACTERISTIC
Symbol
Min
Max
AH
0
AS
4.5
CMH
0
CMS
4.5
Units
ns
ns
ns
ns
Notes
February 2002
Rev. 0
5
White Electronic Designs Corporation • [phone] • www.wedc.com