EtronTech
EM68916CWQA
Table 27. Electrical Characteristics and Recommended A.C. Operating Conditions
(VDD = 1.8V ± 0.1V, TOPR = 0~85 °C)
-25
-3
-37
Specific
Notes
Symbol
Parameter
Unit
Min.
Max.
Min.
Max.
Min.
Max.
CL=3
CL=4
CL=5
CL=6
-
-
8
-
-
8
5
3.75
-
8
13, 31, 32
13, 31, 32
13, 31, 32
13, 31, 32
32, 33
ns
ns
ns
ns
tCK
tCK
tCK
3.75
3
3.75
3
8
-
tCK
Clock cycle time
8
8
2.5
0.48
0.48
8
-
-
-
-
Average clock HIGH pulse width
Average Clock LOW pulse width
0.52
0.52
0.48
0.48
0.52
0.52
0.45
0.45
0.55
0.55
tCH(avg)
tCL(avg)
WL
32, 33
Write command to DQS associated clock edge
RL-1
RL-1
RL-1
DQS latching rising transitions to associated clock
edges
-0.25
0.25
-0.25
0.25
-0.25
0.25
26
26
tDQSS
tCK
DQS falling edge to CK setup time
DQS falling edge hold time from CK
0.2
0.2
-
-
0.2
0.2
-
-
0.2
0.2
-
-
tDSS
tDSH
tCK
tCK
DQS input HIGH pulse width
0.35
-
0.35
-
0.35
-
tDQSH
tCK
DQS input LOW pulse width
Write preamble
0.35
0.35
0.4
-
-
0.35
0.35
0.4
-
-
0.35
0.35
0.4
-
-
tDQSL
tWPRE
tWPST
tCK
tCK
tCK
Write postamble
0.6
0.6
0.6
8
5, 7, 20,
25
Address and Control input setup time
0.175
-
0.2
-
0.25
-
tIS(base)
ns
5, 7, 21,
25
Address and Control input hold time
0.25
0.6
-
-
-
0.275
0.6
-
-
-
0.375
0.6
-
-
-
tIH(base)
tIPW
ns
tCK
ns
Control & Address input pulse width for each input
DQ & DM input setup time (differential strobe)
6, 7, 18,
24, 27
0.05
0.1
0.1
tDS(base)
6, 7,
19,24, 27
DQ & DM input hold time (differential strobe)
0.125
-
0.175
-
0.225
-
tDH(base)
ns
DQ and DM input pulse width for each input
DQ output access time from CK, CK#
0.35
-0.4
-0.35
-
-
0.35
-0.45
-0.4
-
-
0.35
-0.5
-0.45
-
-
tDIPW
tAC
tDQSCK
tHZ
tLZ(DQS)
tLZ(DQ)
tDQSQ
tHP
tCK
ns
ns
0.4
0.35
0.45
0.4
0.5
0.45
36
36
DQS output access time from CK, CK#
Data-out high-impedance time from CK, CK#
DQS(DQS#) low-impedance time from CK, CK#
DQ low-impedance time from CK, CK#
16, 36
16, 36
16, 36
11
tAC(max)
tAC(max)
tAC(max) ns
tAC(min) tAC(max) tAC(min) tAC(max) tAC(min) tAC(max) ns
2tAC(min)
2tAC(min)
2tAC(min)
tAC(max)
0.2
tAC(max)
0.24
tAC(max) ns
0.3
DQS-DQ skew for DQS and associated DQ signals
-
-
-
ns
min(tCL,tC
min(tCL,tC
Min
(tCL,tCH
CK half pulse width
-
-
-
9, 10, 33
ns
)
)
)
H
H
DQ hold skew factor
-
tHP -tQHS
0.9
0.3
-
tHP -tQHS
0.9
0.34
-
0.4
10, 34
35
tQHS
tQH
ns
ns
DQ/DQS output hold time from DQS
Read preamble
-
-
tHP -tQHS
-
1.1
1.1
0.9
0.4
1.1
17, 37
17, 38
4, 28
tRPRE
tRPST
tRRD
tCCD
tWR
tCK
Read postamble
0.4
0.6
0.4
0.6
0.6
tCK
Active to active command period
CAS# to CAS# command delay
Write recovery time
7.5
-
-
-
-
-
-
-
-
7.5
-
-
-
-
-
-
-
-
7.5
-
ns
2
2
2
-
tCK
15
15
15
-
28
12, 29
3, 22, 28
3, 28
23
ns
Auto Power write recovery + precharge time
Internal Write to Read Command Delay
Internal read to precharge command delay
CKE minimum pulse width
WR + tRP
7.5
WR + tRP
7.5
WR + tRP
7.5
-
tDAL
tWTR
tRTP
tCKE
tXSNR
tXSRD
tXP
ns
-
ns
7.5
7.5
7.5
-
ns
3
3
3
-
tCK
Exit self refresh to non-read command delay
Exit self refresh to a read command
Exit precharge power down to any command
-
28
t
t
t
ns
RFC+10
200
2
RFC+10
200
2
RFC+10
200
2
-
-
-
-
-
tCK
-
tCK
Etron Confidential
26
Rev. 1.1
Apr. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
