UM6522A Datasheet, PDF (3/17 Pages) UMC Corporation – Versatile Interface Adapter (VIA)

Read Timing Characteristics (Figure 3.)
UM6522/A
Note: tr, tf = 10 to 30ns.
CHIP SELECTS,
R E G I S T E R SELECTS.
Rm
PERIPHERAL
DATA
DATA BUS
Figure 3. Read Timing Characteristics
Write Timing Characteristics (Figure 4.)
Symbol
TCY
TC
TACW
TCAW
TWGW
TCWW
TDCW
THW
TCFW
TCMOS
Parameter
Cycle Time
$2 Pulse Width
Address Set-Up Time
Address Hold Time
R/W Set-Up Time
Rm Hold Time
Data Bus Set- Up Time
Data Bus Hold Time
Peripheral Data Delay Time
Peripheral Data Delay Time
to CMOS Levels
UM6522
l-J-M.--S- 2-2-.A.
Min.
Max.
Min.
Max. 1
1
0.44 _I
180 )
50
25 _I
-_I
0.50
50 I
I
0.22
;!5
90 T ^-
0
0
-
180
-
90
-
0
-
0
-
300
10
-
E^-
150
-
10
1.0
-
2.0
-
-
1 .o
2.0
Note: tr, tf = 10 to 30ns.
Unit
PS
PS
ns
ns
ns
ns
ns
ns
PS
q ^PS
&Y CLOCK
CHIP SELECTS.
REGISTER SELECTS.
DATA BUS
PERIPHERAL
DATA
Figure 4. Weite Timing Characteristics
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