Datasheet
Table 27. Electrical Characteristics and Recommended A.C. Operating Conditions
(V
DD
= 1.8V ± 0.1V, T
OPER
= -40~95 °C)
Symbol Parameter
-18I -25I -3I
Unit
Specific
Notes
Min. Max. Min. Max. Min. Max.
t
CK(avg)
Average clock period
CL=3 - -
5
8
5
8
ns
15, 33, 34
CL=4 3.75 8 3.75 8 3.75 8
ns
15, 33, 34
CL=5 3 8 2.5 8 3 8
ns
15, 33, 34
CL=6 2.5 8 2.5 8 -
- ns
15, 33, 34
CL=7 1.875 8 - - -
- ns
15, 33, 34
t
CH(avg)
Average clock HIGH pulse width 0.48 0.52 0.48 0.52 0.48 0.52
t
CK
34, 35
t
CL(avg)
Average Clock LOW pulse width 0.48 0.52 0.48 0.52 0.48 0.52
t
CK
34, 35
WL
Write command to DQS associated clock
edge
RL-1 RL-1 RL-1
t
CK
t
DQSS
DQS latching rising transitions to
associated clock edges
-0.25 0.25 -0.25 0.25 -0.25 0.25
t
CK
28
t
DSS
DQS falling edge to CK setup time 0.2 - 0.2 - 0.2 -
t
CK
28
t
DSH
DQS falling edge hold time from CK 0.2 - 0.2 - 0.2
-
t
CK
t
DQSH
DQS input HIGH pulse width 0.35 - 0.35 - 0.35 -
t
CK
t
DQSL
DQS input LOW pulse width 0.35 - 0.35 - 0.35 -
t
CK
t
WPRE
Write preamble 0.35 - 0.35 - 0.35 -
t
CK
t
WPST
Write postamble 0.4 0.6 0.4 0.6 0.4 0.6
t
CK
10
t
IS(base)
Address and Control input setup time 0.125 - 0.175 - 0.2 -
ns
5, 7, 9, 22,
27
t
IH(base)
Address and Control input hold time 0.2 - 0.25 - 0.275 -
ns
5, 7, 9, 23,
27
t
IPW
Control & Address input pulse width for
each input
0.6 - 0.6 - 0.6 -
t
CK
t
DS(base
)
DQ & DM input setup time 0 - 0.05 - 0.1 -
ns
6, 7, 8, 20,
26, 29
t
DH(base
)
DQ & DM input hold time 0.075 - 0.125 - 0.175 -
ns
6, 7, 8, 21,
26, 29
t
DIPW
DQ and DM input pulse width for each
input
0.35 - 0.35 - 0.35 -
t
CK
t
AC
DQ output access time from CK, CK# -0.35 0.35 -0.4 0.4 -0.45 0.45
ns
38
t
DQSCK
DQS output access time from CK, CK# -0.325 0.325 -0.35 0.35 -0.4 0.4
ns
38
t
HZ
Data-out high-impedance time from CK,
CK#
-
t
AC(max)
-
t
AC(max)
-
t
AC(max)
ns
18, 38
t
LZ(DQS)
DQS(DQS#) low-impedance time from
CK, CK#
t
AC(min)
t
AC(max)
t
AC(min)
t
AC(max)
t
AC(min)
t
AC(max)
ns
18, 38
t
LZ(DQ)
DQ low-impedance time from CK, CK#
2t
AC(min)
t
AC(max)
2t
AC(min)
t
AC(max)
2t
AC(min)
t
AC(max)
ns
18, 38
t
DQSQ
DQS-DQ skew for DQS and associated
DQ signals
- 0.175 - 0.2
- 0.24 ns
13
t
HP
CK half pulse width min(t
CL
,t
CH
)- min(t
CL
,t
CH
)- min(t
CL
,t
CH
)
- ns
11, 12, 35
t
QHS
DQ hold skew factor - 0.25 - 0.3 - 0.34
ns
12, 36
t
QH
DQ/DQS output hold time from DQS t
HP
-t
QHS
- t
HP
-t
QHS
- t
HP
-t
QHS
-
ns
37
t
RPRE
Read preamble 0.9 1.1 0.9 1.1 0.9 1.1
t
CK
19, 39
t
RPST
Read postamble 0.4 0.6 0.4 0.6 0.4 0.6
t
CK
19, 40
t
RRD
Active to active command period 10 - 10 - 10 -
ns
4, 30
t
CCD
CAS# to CAS# command delay 2 - 2 - 2 -
t
CK
t
WR
Write recovery time 15 - 15 - 15 -
ns
30
t
DAL
Auto Power write recovery + precharge
time
WR + t
RP
- WR + t
RP
- WR + t
RP
-
ns
14, 31
t
WTR
Internal Write to Read Command Delay 7.5 - 7.5 - 7.5 -
ns
3, 24, 30
AS4C32M16D2A-25BIN
Alliance Memory Inc.
511 Taylor Way, San Carlos, CA 94070 TEL: (650) 610-6800 FAX: (650) 620-9211
Alliance Memory Inc. reserves the right to change products or specification without notice
Rev.1.2
26
Jun./2014