
DMA 2271, DMA 2280, DMA 2281
15
2.5.5. DRAM Interface Characteristics
Symbol
Parameter
Pin No.
Min.
Typ.
Max.
Unit
Test Conditions
V
DIL
RAM Data Input Low Voltage
1
–
–
0.8
V
V
DIH
RAM Data High Voltage
2.0
–
–
V
t
DIS
RAM Data Input Setup Time
before CAS Output High
1, 68
–
–
75
ns
t
DIH
RAM Data Input Hold Time
after CAS Output High
0
–
33
ns
V
DOL
RAM Data Output Low Voltage
1
–
–
0.4
V
I
DO
= 1.6 mA
V
DOH
RAM Data Output High Voltage
2.4
–
–
V
–I
DO
= 0.1 mA
t
DT
RAM Data Op. Transition Time
3
–
50
ns
t
DHR
RAM Data Hold Time after
RAS Low
1, 8, 68
140
–
–
ns
t
DS
RAM Data Setup Time before
CAS Low
20
–
–
ns
t
DH
RAM Data Output Hold Time
after CAS Output Low
1, 68
80
–
–
ns
V
AOL
RAM Address Output
Low Voltage
2 to 6,
9 to 11
–
–
0.4
V
I
AO
= 1.6 mA
V
AOH
RAM Address Output
High Voltage
2.4
–
–
V
–I
AO
= 0.1 mA
t
AT
RAM Address Output
Transition Time
3
–
50
ns
t
RAH
Row Address Output Hold Time
after RAS Output Low
2 to 6, 9 to
11, 8
22
–
–
ns
t
ASR
Row Address Output Setup
Time before RAS Output Low
30
–
–
ns
t
AR
Column Address Output Hold
Time after RAS Output Low
2 to 6, 9 to
11, 68
125
–
–
ns
t
CAH
Column Address Output Hold
Time after CAS Output
70
–
–
ns
t
ASC
Column Address Output Setup
Time before CAS Output
10
–
–
ns
V
RASOL
RAS Output Low Voltage
8
–
–
0.4
V
I
RASO
= 1.6 mA
V
RASOH
RAS Output High Voltage
2.4
–
–
V
–I
RASO
= 0.1 mA
t
RAST
RAS Output Transition Time
3
–
50
ns
t
RAS
RAS Low Pulsewidth
125
–
3000
ns
t
RP
RAS Output Precharge Time
130
–
–
ns
t
RSH
RAS Output Hold Time after
CAS Output Low
8, 68
110
–
–
ns
V
CASOL
CAS Output Low Voltage
68
–
–
0.4
V
I
CASO
= 1.6 mA
V
CASOH
CAS Output High Voltage
2.4
–
–
V
–I
CASO
= 0.1 mA
t
PC
Page Mode Cycle Time
170
–
–
ns