WS82C55A Ver la hoja de datos (PDF) - Wing Shing International Group
Número de pieza
componentes Descripción
Fabricante
WS82C55A Datasheet PDF : 25 Pages
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AC Electrical Specifications VCC = +5V± 10%, GND = 0V; TA =
WS82C55A
SYMBOL
PARAMETER
MIN
MAX
UNITS
TEST
CONDITIONS
READ TIMING
(1) tAR
Address Stable Before RD
0
-
(2) tRA
Address Stable After RD
0
-
(3) tRR
RD Pulse Width
250
-
(4) tRD
Data Valid From RD
-
200
(5) tDF
Data Float After RD
10
75
(6) tRV
Time Between RDs and/or WRs
300
-
WRITE TIMING
(7) tAW
Address Stable Before WR
0
-
(8) tWA
Address Stable After WR
20
-
(9) tWW
WR Pulse Width
100
-
(10) tDW
Data Valid to WR High
100
-
(11) tWD
Data Valid After WR High
30
-
OTHER TIMING
(12) tWB
WR = 1 to Output
-
350
(13) tIR
Peripheral Data Before RD
0
-
(14) tHR
Peripheral Data After RD
0
-
(15) tAK
ACK Pulse Width
200
-
(16) tST
STB Pulse Width
100
-
(17) tPS
Peripheral Data Before STB High
20
-
(18) tPH
Peripheral Data After STB High
50
-
(19) tAD
ACK = 0 to Output
-
175
(20) tKD
ACK = 1 to Output Float
20
250
(21) tWOB
WR = 1 to OBF = 0
-
150
(22) tAOB
ACK = 0 to OBF = 1
-
150
(23) tSIB
STB = 0 to IBF = 1
-
150
(24) tRIB
RD = 1 to IBF = 0
-
150
(25) tRIT
RD = 0 to INTR = 0
-
200
(26) tSIT
STB = 1 to INTR = 1
-
150
(27) tAIT
ACK = 1 to INTR = 1
-
150
(28) tWIT
WR = 0 to INTR = 0
-
200
(29) tRES
Reset Pulse Width
500
-
NOTE: Period of initial Reset pulse after power-on must be at least 50µsec. Subsequent Reset pulses may be 500ns minimum.
18
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