ALL DEVICES: READ, WRITE, READ–MODIFY–WRITE, AND REFRESH CYCLES (continued)
Symbol MCM218165BV–60 MCM218165BV–70
Std
Alt
Min
0
Max
—
Min
0
Max
—
Parameter
Read Command Setup Time
Unit Notes
t
t
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
11, 17
17
WHCEL
CEHWX
REHWX
RCS
RCH
RRH
Read Command Hold Time to LCAS/UCAS
Read Command Hold Time to RAS
Output Buffer Turn–Off Time
t
t
t
t
0
—
0
—
10
0
—
10
0
—
t
t
15
15
—
18
18
—
18
CEHQZ
OFF
Output Buffer Turn–Off Time from G
Write Command Setup Time
t
t
0
0
18
GHQZ
GZ
t
t
0
0
8, 19
WLCEL
WCS
Write Command Hold Time
t
t
10
10
15
15
0
—
10
10
18
18
0
—
CELWH
WCH
Write Command Pulse Width
t
t
—
—
WLWH
WP
Write Command to RAS Lead Time
Write Command to LCAS/UCAS Lead Time
Data In Setup Time
t
t
—
—
WLREH
WLCEH
RWL
CWL
t
t
—
—
20
21
21
t
t
—
—
DVCEL
DS
Data In Hold Time
t
t
10
10
133
77
32
47
15
10
10
5
—
15
10
157
89
37
54
18
10
10
5
—
CELDX
DH
W to Data In Delay
t
t
—
—
WLDV
WD
Read–Modify–Write Cycle Time
RAS to W Delay Time
t
t
t
—
—
RELREL
RWC
RWD
CWD
t
—
—
19
19
19
RELWL
CELWL
LCAS/UCAS to W Delay Time
Column Address to W Delay Time
G Hold Time from W
t
t
—
—
t
t
—
—
AVWL
WLGL
AWD
t
t
—
—
GH
LCAS/UCAS Setup Time (CAS Before RAS Refresh)
LCAS/UCAS Hold Time (CAS Before RAS Refresh)
RAS Precharge to LCAS/UCAS Hold Time
LCAS/UCAS Precharge Time (Normal Mode)
EDO Page Mode Cycle Time
t
t
—
—
CELCEL
RELCEH
REHCEL
CEHCEL
CSR
CHR
t
t
t
t
—
—
11
8
t
—
—
RPC
CPN
t
10
25
10
60
—
10
30
10
70
—
22
t
t
—
—
RELREL
CEHCEL
RELREH
PC
CP
EDO Page Mode LCAS/UCAS Precharge Time
EDO Page Mode RAS Pulse Width
NOTES:
t
t
t
—
—
22
23
t
100 k
100 k
RASP
(continued)
17. Either t
or t
must be satisfied for a read cycle.
(max) define the time at which the output achieves the open circuit condition and is not referenced to output voltage
RCH
RRH
(max) and/or t
18. t
OFF
GZ
is determined by the later rising edge of RAS or CAS.
, t , and t are not restrictive operating parameters. They are included in the data sheet as electrical char-
acteristics only; if t
levels. t
OFF
19. t
, t
WCS RWD CWD
AWD
(min), the cycle is an early write cycle and the data out pin will remain open circuit (high impedance)
≥ t
WCS
WCS
CWD
throughout the entire cycle. If t
≥ t
(min), t
≥ t
(min), t
≥ t
(min), and t
≥ t
(min), the cycle is a
CPW
CWD
RWD
RWD
AWD
AWD
CPW
read–modify–write cycle and the data out will contain data read from the selected cell. If neither of these sets of conditions is satisfied, the
condition of the data out (at access time) is indeterminate.
20. t
shall be satisfied by both LCAS and UCAS.
CWL
21. Theseparameters are referenced to LCAS or UCAS separately in an early write cycle and to W edge in a delayed write or read–modify–write
cycle.
22. t
23. t
and t
are determined by the time that both LCAS and UCAS are high.
defines RAS pulse width in EDO page mode cycles.
CPN
CP
RASP
MCM218165BV
7
MOTOROLA DRAM