W972GG8JB-3-TR Datasheet, PDF (45/87 Pages) Winbond – 32M 8 BANKS 8 BIT DDR2 SDRAM

W972GG8JB
10.11.2 AC Characteristics and Operating Condition for -25/25I/-3 speed grades
Notes: 1-3 and 45-47 apply to the entire table
SYM.
SPEED GRADE
Bin(CL-tRCD-tRP)
PARAMETER
DDR2-800 (-25/25I)
5-5-5/6-6-6
MIN. MAX.
DDR2-667 (-3)
5-5-5
MIN.
MAX.
tRCD Active to Read/Write Command Delay Time
12.5

15

tRP Precharge to Active Command Period
12.5

15

tRC Active to Ref/Active Command Period
57.5

60

tRAS Active to Precharge Command Period
45
70000
45
70000
tRFC
Auto Refresh to Active/Auto Refresh command
period
195

195

tREFI
Average periodic
refresh Interval
-40°C ≤ TCASE ≤ 85°C
85°C < TCASE ≤ 95°C


7.8
3.9


7.8
3.9
tCCD _{CAS to CAS command delay}
2

2

tCK(avg)
tCH(avg)
tCL(avg)
tCK(avg) @ CL=3
Average clock period
tCK(avg) @ CL=4
tCK(avg) @ CL=5
tCK(avg) @ CL=6
Average clock high pulse width
Average clock low pulse width
5
8
5
8
3.75
8
3.75
8
2.5
8
3
8
2.5
8


0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
tAC _{DQ output access time from CLK/ CLK}
-400
400
-450
450
tDQSCK _{DQS output access time from CLK / CLK}
-350
350
-400
400
tDQSQ DQS-DQ skew for DQS & associated DQ signals

200

240
tCKE CKE minimum high and low pulse width
3

3

tRRD
Active to active command period for 1KB page
size
7.5

7.5

tFAW Four Activate Window for 1KB page size
35

37.5

tWR Write recovery time
15

15

tDAL Auto-precharge write recovery + precharge time WR + tnRP  WR + tnRP 
tWTR Internal Write to Read command delay
7.5

7.5

tRTP Internal Read to Precharge command delay
7.5

7.5

tIS (base) Address and control input setup time
175

200

tIH (base) Address and control input hold time
250

275

tIS (ref) Address and control input setup time
375

400

tIH (ref) Address and control input hold time
375

400

tIPW
Address and control input pulse width for each
input
0.6

0.6

tDQSS
DQS latching rising transitions to associated
clock edges
-0.25
0.25
-0.25
0.25
tDSS DQS falling edge to CLK setup time
0.2

0.2

tDSH DQS falling edge hold time from CLK
0.2

0.2

tDQSH DQS input high pulse width
0.35

0.35

tDQSL DQS input low pulse width
0.35

0.35

UNITS²⁵ NOTES
nS
23
nS
23
nS
23
nS
4,23
nS
5
μS
μS
nCK
nS
nS
nS
nS
tCK(avg)
tCK(avg)
pS
5
5,6
30,31
30,31
30,31
30,31
30,31
30,31
35
pS
35
pS
13
nCK
7
nS
8,23
nS
23
nS
23
nCK
24
nS
9,23
nS
4,23
pS
10,26,
40,42,43
pS
11,26,
40,42,43
pS
10,26,
40,42,43
pS
11,26,
40,42,43
tCK(avg)
tCK(avg) 28
tCK(avg) 28
tCK(avg) 28
tCK(avg)
tCK(avg)
- 45 -
Publication Release Date: Dec. 03, 2012
Revision A03