MC-458CB646 Datasheet, PDF (9/16 Pages) NEC – 8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

MC-458CB646
Asynchronous Characteristics
Parameter
Symbol
-A 80
-A 10
Unit Note
MIN.
MAX.
MIN.
MAX.
REF to REF/ACT command period
tRC
70
70
ns
ACT to PRE command period
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
ns
ACT(one) to ACT(another) command period
tRRD
16
20
ns
Data-in to PRE command period
tDPL
8
10
ns
Data-in to ACT(REF) command period /CAS latency = 3 tDAL3 1CLK+20
1CLK+20
ns
(Auto precharge)
/CAS latency = 2 tDAL2 1CLK+20
1CLK+20
ns
Mode register set cycle time
tRSC
2
2
CLK
Transition time
tT
0.5
30
1
30
ns
Refresh time (4,096 refresh cycles)
tREF
64
64
ms
Data Sheet M13049EJ7V0DS00
9