8254 データシートの表示（PDF） - Intel
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8254 Datasheet PDF : 21 Pages
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8254
ABSOLUTE MAXIMUM RATINGS
Ambient Temperature Under Bias
0 C to 70 C
Storage Temperature
b65 C to a150 C
Voltage on Any Pin with
Respect to Ground
b0 5V to a7V
Power Dissipation
1W
NOTICE This is a production data sheet The specifi-
cations are subject to change without notice
WARNING Stressing the device beyond the ‘‘Absolute
Maximum Ratings’’ may cause permanent damage
These are stress ratings only Operation beyond the
‘‘Operating Conditions’’ is not recommended and ex-
tended exposure beyond the ‘‘Operating Conditions’’
may affect device reliability
D C CHARACTERISTICS TA e 0 C to 70 C VCC e 5V g10%
Symbol
Parameter
Min
Max
Units
VIL
Input Low Voltage
b0 5
08
V
VIH
Input High Voltage
20
VCC a0 5V
V
VOL
Output Low Voltage
0 45
V
VOH
Output High Voltage
24
V
IIL
Input Load Current
g10
mA
IOFL
Output Float Leakage
g10
mA
ICC
VCC Supply Current
170
mA
CIN
Input Capacitance
10
pF
CI 0
I O Capacitance
20
pF
Test Conditions
IOL e 2 0 mA
IOH e b400 mA
VIN e VCC to 0V
VOUT e VCC to 0 45V
fc e 1 MHz
Unmeasured pins
returned to VSS(4)
A C CHARACTERISTICS TA e 0 C to 70 C VCC e 5V g10% GND e 0V
Bus Parameters(1)
READ CYCLE
Symbol
Parameter
8254
8254-2
Unit
Min
Max
Min
Max
tAR
v Address Stable Before RD
45
30
ns
tSR
v CS Stable Before RD
0
0
ns
tRA
u Address Hold Time After RD
0
0
ns
tRR
RD Pulse Width
150
95
ns
tRD
v Data Delay from RD
120
85
ns
tAD
Data Delay from Address
220
185
ns
tDF
u RD to Data Floating
5
90
5
65
ns
tRV
Command Recovery Time
200
165
ns
NOTE
1 AC timings measured at VOH e 2 0V VOL e 0 8V
18
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