82C55A
o
o
AC Electrical Specifications
V
= +5V± 10%, GND = 0V; T = -55 C to +125 C (M82C55A) (M82C55A-5);
CC A
o
o
T = -40 C to +85 C (I82C55A) (I82C55A-5);
A
o
o
T = 0 C to +70 C (C82C55A) (C82C55A-5)
A
82C55A-5
82C55A
TEST
SYMBOL
READ TIMING
(1) tAR
PARAMETER
MIN
MAX
MIN
MAX
UNITS
CONDITIONS
Address Stable Before RD
Address Stable After RD
RD Pulse Width
0
0
-
-
0
0
-
-
ns
ns
ns
ns
ns
ns
(2) tRA
(3) tRR
250
-
-
150
-
-
(4) tRD
Data Valid From RD
200
75
-
120
75
-
1
2
(5) tDF
Data Float After RD
10
300
10
300
(6) tRV
Time Between RDs and/or WRs
WRITE TIMING
(7) tAW
Address Stable Before WR
Address Stable After WR
WR Pulse Width
0
-
-
-
-
-
0
-
-
-
-
-
ns
ns
ns
ns
ns
(8) tWA
20
20
(9) tWW
100
100
30
100
100
30
(10) tDW
(11) tWD
OTHER TIMING
(12) tWB
(13) tIR
Data Valid to WR High
Data Valid After WR High
WR = 1 to Output
-
350
-
-
350
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1
Peripheral Data Before RD
Peripheral Data After RD
ACK Pulse Width
0
0
(14) tHR
(15) tAK
0
-
0
-
200
-
200
-
(16) tST
STB Pulse Width
100
-
100
-
(17) tPS
Peripheral Data Before STB High
Peripheral Data After STB High
ACK = 0 to Output
20
-
20
-
(18) tPH
(19) tAD
(20) tKD
(21) tWOB
(22) tAOB
(23) tSIB
(24) tRIB
(25) tRIT
(26) tSIT
(27) tAIT
(28) tWIT
(29) tRES
50
-
50
-
-
175
250
150
150
150
150
200
150
150
200
-
-
175
250
150
150
150
150
200
150
150
200
-
1
ACK = 1 to Output Float
WR = 1 to OBF = 0
20
20
2
-
-
1
ACK = 0 to OBF = 1
STB = 0 to IBF = 1
-
-
1
-
-
1
RD = 1 to IBF = 0
-
-
1
RD = 0 to INTR = 0
-
-
1
STB = 1 to INTR = 1
ACK = 1 to INTR = 1
WR = 0 to INTR = 0
Reset Pulse Width
-
-
1
-
-
-
-
1
1
500
500
1, (Note)
NOTE: Period of initial Reset pulse after power-on must be at least 50µsec. Subsequent Reset pulses may be 500ns minimum.
18
HARRIS [ HARRIS CORPORATION ]
