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8253/8253·5
A.C. CHARACTERISTICS
TA
=
o°c
to
70°C;
Vcc
= 5.0V ±5%; GND =
OV
Bus Parameters (Note
1)
Re.dCycle:
8253
8253-5
SYMBOL PARAMETER
MIN.
MAX.
MIN.
MAX.
UNIT
tAR
Address
Stable Before READ
50
30
ns
tRA
Address
Hold Time
for
READ
5
5
ns
tRR
READ
Pulse
Width
400
300
ns
tRO
Data
Delay From READI21
300
200
ns
tOF
READ
to
Data Floating
25
125
25
100
ns
tRV
Recovery
Time
Between
READ
1
1
and Any
Other
Control
Signal
/-IS
Write Cycle:
8253
8253-5
SYMBOL
PARAMETER
MIN.
MAX.
MIN.
MAX,
UNIT
tAW
Address Stable Before
WR
ITE
50
30
ns
tWA
Address Hold Time
for
WR
ITE
30
30
ns
tww
WR
ITE
Pulse
Width
400
300
ns
tow
Data
Set
Up Time
for
WR
ITE
300
250
ns
two
Data
Hold Time
for
WR
ITE
40
30
ns
tRv
Recovery
Time
Between WRITE
1
1
IlS
and Any
Other
Control
Signal
Notes: 1. AC timings measured
at
VOH =
2.2.
VOL =
0.8
2.
Test Conditions:
8253.
CL = 1
OOpF;
8253-5:
CL
=
150pF.
Write Timing:
Read
Timing:
Ao-t.
CS
__
"1'
__________
t--f"'-
___
_
DATA
BUS
Input
Waveforms for A.C. Tests:
2.4--.....,.X
0
2,.28
>
_ _
TEST
POINTS
0.45
---..I
<::X
__
_
9-15
AFN-0074SA-tO