64Mb: x4, x8, x16 SDRAM
Electrical Specifications – AC Operating Conditions
Table 13: AC Functional Characteristics
Notes 1–6 apply to all parameters and conditions
Note
Parameter
Symbol -6/-6A
-7E
1
-75
1
Unit
tCK
tCK
tCK
tCK
tCK
s
Last data-in to burst STOP command
READ/WRITE command to READ/WRITE command
Last data-in to new READ/WRITE command
CKE to clock disable or power-down entry mode
Data-in to ACTIVE command
tBDL
tCCD
tCDL
1
1
1
1
5
17
17
17
18
1
1
1
1
tCKED
tDAL
1
1
4
5
19,
20
Data-in to PRECHARGE command
tDPL
2
2
2
tCK
20,
21
DQM to input data delay
tDQD
tDQM
tDQZ
tDWD
tMRD
tPED
0
0
2
0
2
1
2
0
0
2
0
2
1
2
0
0
2
0
2
1
2
tCK
tCK
tCK
tCK
tCK
tCK
tCK
17
17
17
17
22
17
DQM to data mask during WRITEs
DQM to data High-Z during READs
WRITE command to input data delay
LOAD MODE REGISTER command to ACTIVE or REFRESH command
CKE to clock enable or power-down exit setup mode
Last data-in to PRECHARGE command
tRDL
20,
21
Data-out High-Z from PRECHARGE command
CL = 3
CL = 2
CL = 1
tROH(3)
tROH(2)
tROH(1)
3
2
1
3
2
–
3
2
–
tCK
tCK
tCK
17
17
17
1. Minimum specifications are used only to indicate cycle time at which proper operation
over the full temperature range is ensured:
0°C ≤ TA ≤ +70°C (commercial)
Notes:
–40°C ≤ TA ≤ +85°C (industrial)
–40°C ≤ TA ≤ +105°C (automotive)
2. An initial pause of 100μs is required after power-up, followed by two AUTO REFRESH
commands, before proper device operation is ensured. (VDD and VDDQ must be powered
up simultaneously. VSS and VSSQ must be at same potential.) The two AUTO REFRESH
command wake-ups should be repeated any time the tREF refresh requirement is excee-
ded.
3. In addition to meeting the transition rate specification, the clock and CKE must transit
between VIH and VIL (or between VIL and VIH) in a monotonic manner.
4. Outputs measured at 1.5V with equivalent load:
Q
50pF
5. AC operating and IDD test conditions have VIL = 0V and VIH = 3.0V using a measurement
reference level of 1.5V. If the input transition time is longer than 1ns, then the timing is
measured from VIL,max and VIH,min and no longer from the 1.5V midpoint. CLK should al-
ways be 1.5V referenced to crossover. Refer to Micron technical note TN-48-09.
6. The -6A speed grade is not backward compatible with -7E at CL = 2.
7. Not applicable for Revision G.
PDF: 09005aef80725c0b
64mb_x4x8x16_sdram.pdf - Rev. U 05/13 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
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© 1999 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
