MOSEL VITELIC
During a Write cycle, if WE goes low at a time in
relationship to CAS that would normally cause the
outputs to be active, it is necessary to use OE to
disable the output drivers prior to the WE low
transition to allow Data In Setup Time (tDS) to be
satisfied.
Power-On
After application of the VCC supply, an initial
pause of 200 ยตs is required followed by a minimum
of 8 initialization cycles (any combination of cycles
containing a RAS clock). Eight initialization cycles
are required after extended periods of bias without
clocks (greater than the Refresh Interval).
During Power-On, the VCC current requirement
of the V53C16128H is dependent on the input
levels of RAS and CAS. If RAS is low during
Power-On, the device will go into an active cycle
and ICC will exhibit current transients. It is
recommended that RAS and CAS track with VCC or
be held at a valid VIH during Power-On to avoid
current surges.
V53C16128H
Table 1. V53C16128H Data Output
Operation for Various Cycle Types
Cycle Type
Read Cycles
CAS-Controlled Write Cycle
(Early Write)
WE-Controlled Write Cycle
(Late Write)
Read-Modify-Write Cycles
EDO Page Mode Read
EDO Page Mode Write Cycle
(Early Write)
EDO Page Mode Read-Modify-
Write Cycle
RAS-only Refresh
CAS-before-RAS Refresh Cycle
CAS-only Cycles
I/O State
Data from Addressed
Memory Cell
High-Z
OE Controlled.
High OE = High-Z I/Os
Data from Addressed
Memory Cell
Data from Addressed
Memory Cell
High-Z
Data from Addressed
Memory Cell
High-Z
Data remains as in
previous cycle
High-Z
V53C16128H Rev. 1.2 July 1997
17