MC-458CA726 Datasheet, PDF (9/16 Pages) NEC – 8M-WORD BY 72-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

MC-458CA726
Asynchronous Characteristics
Parameter
Symbol
-A 80
-A 10
MIN.
MAX.
MIN.
MAX.
REF to REF/ACT command period
tRC
70
70
ACT to PRE command period
tRAS
48
120,000
50
120,000
PRE to ACT command period
tRP
20
20
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 period /CAS latency = 3 tDAL3 1CLK+20
1CLK+20
(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
Unit
ns
ns
ns
ns
ns
ns
ns
ns
CLK
ns
ms
Note
Data Sheet M13050EJ7V0DS00
9