4 MEG x 4
FPM DRAM
AC ELECTRICAL CHARACTERISTICS
(Notes: 5, 6, 7, 8, 9, 10, 11, 12) [Vcc (MIN) £ Vcc £ Vcc (MAX)]
ACCHARACTERISTICS
-5
-6
PARAMETER
SYMBOL
MIN
MAX
MIN
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
t
Access time from column address
Column-addresshold time (referenced to RAS#)
Column-addresssetup time
Row-addresssetup time
AA
25
30
t
AR
38
0
45
0
t
ASC
t
ASR
0
0
t
Column address to WE# delay time
Access time from CAS#
AWD
42
49
18
t
CAC
13
15
t
Column-addresshold time
CAS# pulse width
CAH
8
8
10
10
15
10
0
t
CAS
10,000
10,000
t
CAS# LOW to “Don’t Care” during Self Refresh
CAS# hold time (CBR Refresh)
CAS# to output in Low-Z
CAS# precharge time
CHD
15
8
t
CHR
4
t
CLZ
0
22
13
t
CP
8
10
t
Access time from CAS# precharge
CAS# to RAS# precharge time
CAS# hold time
CPA
28
35
t
CRP
5
38
5
5
45
5
t
CSH
t
CAS# setup time (CBR Refresh)
CAS# to WE# delay time
WRITE command to CAS# lead time
Data-in hold time
CSR
4
t
CWD
28
8
35
10
10
0
18
t
CWL
t
DH
8
19
19
22
20
t
Data-in setup time
DS
0
t
Output disable
OD
0
12
12
0
15
15
t
Output enable
OE
t
OE# hold time from WE# during
READ-MODIFY-WRITEcycle
OEH
8
10
t
Output buffer turn-off delay
OFF
0
0
12
50
0
0
15
60
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ms
ms
17, 22
t
OE# setup prior to RAS# during HIDDEN REFRESH cycle
FAST-PAGE-MODE READ or WRITE cycle time
FAST-PAGE-MODEREAD-WRITEcycle time
Access time from RAS#
ORD
t
PC
20
47
25
56
t
PRWC
t
RAC
t
RAS# to column-address delay time
Row-addresshold time
RAD
9
9
12
10
60
60
100
104
14
0
15
t
RAH
t
RAS# pulse width
RAS
50
50
100
84
11
0
10,000
10,000
t
RAS# pulse width (FASTPAGEMODE)
RAS# pulse width during Self Refresh
Random READ or WRITE cycle time
RAS# to CAS# delay time
RASP
125,000
125,000
t
RASS
t
RC
t
RCD
14
16
t
READcommand hold time (referenced to CAS#)
READcommand setup time
RCH
t
RCS
0
0
t
Refresh period (2,048 cycles)
REF
32
64
32
64
t
Refresh period (4,096 cycles)
REF
4 Meg x 4 FPM DRAM
D49_5V.p65 – Rev. 5/00
Micron Technology, Inc., reservesthe right to change productsor specificationswithout notice.
©2000, Micron Technology, Inc.
6
MICRON [ MICRON TECHNOLOGY ]
