ACT-D1M96S Ver la hoja de datos (PDF) - Aeroflex Corporation
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ACT-D1M96S Datasheet PDF : 14 Pages
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Auto Refresh (REFR)
Before performing a REFR, both banks of all 6 chips must be deactivated (placed in precharge). To
enter a REFR command, RAS and CAS must be low and WE must be high upon the rising edge of
CLK (see Table 1). The refresh address is generated internally such that, after 4096 REFR commands,
both banks of all 6 chips of the ACT-D1M96S have been refreshed. The external address and bank
select (A11) are ignored. The execution of a REFR command automatically deactivates both banks
upon completion of the internal auto-refresh cycle, allowing consecutive REFR-only commands to be
executed, if desired, without any intervening DEAC commands. The REFR commands do not
necessarily have to be consecutive, but all 4096 must be completed before tREF expires.
Power Up Initialization
Device initialization should be performed after a power up to the full VCC level. After power is
established, a 200µs interval is required (with no inputs other than CLK). After this interval, both banks
of the device must be deactivated. Eight REFR commands must be performed, and the mode register
must be set to complete the device initialization.
General Information for AC Timing Measurements
All specifications referring to READ commands are also valid for READ-P commands unless otherwise
noted. All specifications referring to WRT commands are also valid for WRT-P commands unless
otherwise noted. All specifications referring to consecutive commands are specified as consecutive
commands for the same bank unless otherwise noted.
Note: For all pin references in the General Description, both sections apply. For example, A11 signals
also apply for BA11 signals.
For additional Detail Information regarding the operation of the individual chip (MT48LC1M16A1) see
Micron’s 524,288-WORD BY 16-BIT BY 2-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS
MEMORY Datasheet Revision 8/99 or contact the Aeroflex Sales Department.
Aeroflex Circuit Technology
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SCD3369-1 REV C 5/31/00 Plainview NY (516) 694-6700
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