Table 11: AC Operating Specifications and Conditions (Continued)
Not all speed grades listed may be supported for this device; refer to the title page for speeds supported; Notes: 1–5 apply to the entire table;
VDDQ = +1.8V ±0.1V, VDD = +1.8V ±0.1V
AC Characteristics
-187E
-25E
-25
-3E
-3
-37E
-5E
Parameter Symbol Min
Max Min Max Min Max Min Max Min Max Min Max Min Max Units Notes
DQS output access tDQSCK –300 +300 –350 +350 –350 +350 –400 +400 –400 +400 –450 +450 –500 +500
time from CK/CK#
ps
19
DQS read preamble tRPRE
MIN = 0.9 × tCK
MAX = 1.1 × tCK
tCK 17, 18,
19
DQS read
postamble
tRPST
tLZ1
MIN = 0.4 × tCK
MAX = 0.6 × tCK
tCK 17, 18,
19, 20
t
CK/CK# to DQS
Low-Z
MIN = AC (MIN)
ps
19, 21,
22
t
MAX = AC (MAX)
DQS rising edge to
CK rising edge
tDQSS
tDQSH
tDQSL
tDSS
MIN = –0.25 × tCK
MAX = +0.25 × tCK
MIN = 0.35 × tCK
MAX = n/a
MIN = 0.35 × tCK
MAX = n/a
MIN = 0.2 × tCK
MAX = n/a
tCK
tCK
tCK
tCK
tCK
18
18
18
18
18
DQS input-high
pulse width
DQS input-low
pulse width
DQS falling to CK
rising: setup time
DQS falling from
CK rising:
tDSH
MIN = 0.2 × tCK
MAX = n/a
hold time
Write preamble
setup time
tWPRES
tWPRE
tWPST
–
MIN = 0
MAX = n/a
MIN = 0.35 × tCK
MAX = n/a
MIN = 0.4 × tCK
MAX = 0.6 × tCK
ps
23, 24
18
DQS write
preamble
tCK
DQS write
postamble
tCK 18, 25
tCK
WRITE command
to first DQS
transition
MIN = WL - tDQSS
MAX = WL + tDQSS
MICRON [ MICRON TECHNOLOGY ]
