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51W17800 Datasheet - Page 11

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Fast Page Mode Read-Modify-Write Cycle

Parameter
Fast page mode read-modify-write
cycle time
WE delay time from CAS precharge t
Refresh
Parameter
Refresh period
Refresh period (L-version)
Self Refresh Mode (L-version)
Parameter
RAS pulse width (self refresh)
RAS precharge time (self refresh)
CAS hold time (self refresh)
Notes: 1. AC measurements assume t
2. An initial pause of 200 s is required after power up followed by a minimum of eight initialization
cycles (any combination of cycles containing RAS-only refresh or CAS-before-RAS refresh). If the
internal refresh counter is used, a minimum of eight CAS-before-RAS refresh cycles are required.
3. Operation with the t
reference point only; if t
controlled exclusively by t
4. Operation with the t
reference point only; if t
controlled exclusively by t
5. Either t
or t
must be satisfied.
OED
CDD
6. Either t
or t
must be satisfied.
DZO
DZC
7. V
(min) and V
(max) are reference levels for measuring timing of input signals. Also, transition
IH
IL
times are measured between V
8. Assumes that t
RCD
recommended value shown in this table, t
9. Measured with a load circuit equivalent to 1 TTL loads and 100 pF. (V
10. Assumes that t
RCD
11. Assumes that t
RCD
HM51W17800
-5
Symbol
Min
Max
t
76
PRWC
53
CPW
Symbol
t
REF
t
REF
HM51W17800L
-5
Symbol
Min
Max
t
100
RASS
t
90
RPS
t
–50
CHS
= 5 ns.
T
(max) limit insures that t
RCD
RAC
is greater than the specified t
RCD
.
CAC
(max) limit insures that t
RAD
RAC
is greater than the specified t
RAD
.
AA
(min) and V
(max).
IH
IL
t
(max) and t
t
(max). If t
RCD
RAD
RAD
exceeds the value shown.
RAC
t
(max) and t
t
(max).
RCD
RAD
RAD
t
(max) and t
t
(max).
RCD
RAD
RAD
HM51W17800 Series
-6
-7
Min
Max
Min
Max
Unit
85
96
ns
60
68
ns
Max
Unit
Note
32
ms
2048 cycles
128
ms
2048 cycles
-6
-7
Min
Max
Min
Max
Unit
100
100
110
130
ns
–50
–50
ns
(max) can be met, t
(max) is specified as a
RCD
(max) limit, then access time is
RCD
(max) can be met, t
(max) is specified as a
RAD
(max) limit, then access time is
RAD
or t
is greater than the maximum
RCD
RAD
= 2.0 V, V
OH
Notes
14
Notes
s
19, 20, 21,
22
= 0.8 V)
OL
11

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