87C51RA Просмотр технического описания (PDF) - Intel
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87C51RA Datasheet PDF : 20 Pages
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8XC51RA RB RC
EXTERNAL MEMORY CHARACTERISTICS (Continued)
All parameter values apply to all devices unless otherwise indicated
Symbol
Description
12 MHz
20 MHz
24 MHz
Oscillator Oscillator Oscillator
Min Max Min Max Min Max
Variable
Oscillator
Min
Max
Units
TPXIZ
Input Instruction Float After
PSEN
8XC51RX
59
8XC51RX-24
30
21
TCLCLb25
ns
TCLCLb20
ns
TAVIV Address to Valid Instruction
312
145
103
In
5 TCLCLb105 ns
TPLAZ PSEN Low to Address Float
10
10
10
10
ns
TRLRH RD Pulse Width
400
200
150
6 TCLCLb100
ns
TWLWH WR Pulse Width
400
200
150
6 TCLCLb100
ns
TRLDV
RD Low to Valid Data In
8XC51RX
8XC51RX-24
252
155
113
5 TCLCLb165 ns
5 TCLCLb95 ns
TRHDX Data Hold After RD
0
0
0
0
ns
TRHDZ Data Float After RD
107
40
23
2 TCLCLb60 ns
TLLDV
ALE Low to Valid Data In
8XC51RX
8XC51RX-24
517
310
243
8 TCLCLb150 ns
8 TCLCLb90 ns
TAVDV
Address to Valid Data In
8XC51RX
8XC51RX-24
585
360
285
9 TCLCLb165 ns
9 TCLCLb90 ns
TLLWL ALE Low to RD or WR Low 200 300 100 200 75 175 3 TCLCLb50 3 TCLCLa50 ns
TAVWL Address Valid to WR Low
8XC51RX
203
4 TCLCLb130
ns
8XC51RX-24
110
77
4 TCLCLb90
ns
TQVWX Data Valid before WR
8XC51RX
33
TCLCLb50
ns
8XC51RX-20
15
TCLCLb35
ns
8XC51RX-24
12
TCLCLb30
ns
TWHQX Data Hold after WR
8XC51RX
33
TCLCLb50
ns
8XC51RX-20
10
TCLCLb40
ns
8XC51RX-24
7
TCLCLb30
ns
TQVWH Data Valid to WR High
8XC51RX
433
7 TCLCLb150
ns
8XC51RX-24
280
222
7 TCLCLb70
ns
TRLAZ RD Low to Address Float
0
0
0
0
ns
TWHLH RD or WR High to ALE High
8XC51RX
43 123 10 90
TCLCLb40 TCLCLa40 ns
8XC51RX-24
12 71 TCLCLb30 TCLCLa30
12
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