M37920S4CGP Datasheet, PDF (35/40 Pages) Mitsubishi Electric Semiconductor – 16 BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M37920S4CGP
16-BIT CMOS MICROCOMPUTER
DRAM refresh
Switching characteristics (VCC = 5 V ± 10 %, VSS = 0 V, Ta = 0 to 70 °C, f(XIN) = 20 MHz, unless otherwise noted)
Symbol
tw(RASCBRL)
tw(CASCBRL)
td(CASCBRL-RASCBRH)
td(RASCBRL-CASCBRL)
td(CASSLFRL-RASSLFRH)
th(RASSLFRH-CASSLFRL)
Parameter
RAS low-level pulse width (At CAS before RAS refresh)
CAS low-level pulse width (At CAS before RAS refresh)
RAS high-level valid time after CAS’s low level start (At CAS before RAS refresh)
CAS low-level valid time after RAS’s low level start (At CAS before RAS refresh)
RAS high-level valid time after CAS’s low level start (At self refresh)
CAS low-level hold time after RAS’s high level (At self refresh)
Limits
Unit
Min.
Max.
2tc – 15
ns
2tc – 15
ns
tc – 15
ns
tc – 15
ns
tc – 15
ns
–15
15
ns
34