MC-458CA721ESA Datasheet, PDF (9/16 Pages) NEC – 8M-WORD BY 72-BIT SYNCHRONOUS DYNAMIC RAM MODULE SO DIMM

MC-458CA721ESA, 458CA721PSA
Asynchronous Characteristics
Parameter
Symbol
-A 80
MIN.
MAX.
-A 10
Unit
MIN.
MAX.
ACT to REF/ACT command period (Operation)
REF to REF/ACT command period (Refresh)
ACT to PRE command period
tRC
70
70
ns
tRC1
70
70
ns
tRAS
48
120,000
50
120,000 ns
PRE to ACT command period
tRP
20
20
ns
Delay time ACT to READ/WRITE command
tRCD
20
20
ACT(one) to ACT(another) command period
tRRD
16
20
Data-in to PRE command period
tDPL
8
10
Data-in to ACT(REF) command
/CAS latency = 3
tDAL3
1CLK+20
1CLK+20
period (Auto precharge)
/CAS latency = 2
tDAL2
1CLK+20
1CLK+20
Mode register set cycle time
tRSC
2
2
Transition time
tT
0.5
30
1
30
Refresh time (4,096 refresh cycles)
tREF
64
64
ns
ns
ns
ns
ns
CLK
ns
ms
Note
Data Sheet M14494EJ2V0DS00
9