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參數(shù)資料
| 型號： | BN87C51BH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 842K |
| 代理商： | BN87C51BH |
AUTOMOTIVE 80C31BH/80C51BH/87C51
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has 5 characters. The first char-
acter is always a `T' (stands for time). The other
characters, depending on their positions, stand for
the name of a signal or the logical status of that
signal. The following is a list of all the characters and
what they stand for.
A:Address.
C:Clock.
D:Input data.
H:Logic level HIGH.
I:Instruction (program memory contents).
L:Logic level LOW, or ALE.
P:PSEN.
Q:Output data.
R:RD signal.
T:Time.
V:Valid.
W:WR signal.
X:No longer a valid logic level.
Z:Float.
For example,
TAVLL e Time from Address Valid to ALE Low.
TLLPL e Time from ALE Low to PSEN Low.
AC CHARACTERISTICS
: (TA eb40 Cto a125 C; VCC e 5V g10% (5V g20% EPROM Only);
VSS e 0V; Load Capacitance for Port 0, ALE, and PSEN e 100 pF; Load Capacitance for All Other
Outputs e 80 pF)
EXTERNAL PROGRAM AND DATA MEMORY CHARACTERISTIC
S
Symbol
Parameter
12 MHz Osc
Variable Oscillator
Units
Min
Max
Min
Max
1/T CLCL
Oscillator Frequency
MHz
87C51/80C51BH/80C31BH
3.5
12±16
TLHLL
ALE Pulse Width
127
2TCLCLb40
ns
TAVLL
Address Valid to ALE Low
28
TCLCLb55
ns
TLLAX
Address Hold After ALE Low
48
TCLCLb35
ns
TLLIV
ALE Low to Valid Instr In
224
4TCLCLb110
ns
TLLPL
ALE Low to PSEN Low
43
TCLCLb40
ns
TPLPH
PSEN Pulse Width
205
3TCLCLb45
ns
TPLIV
PSEN Low to Valid Instr In
135
3TCLCLb115
ns
TPXIX
Input Instr Hold After PSEN
00
ns
TPXIZ
Input Instr Float After PSEN
59
TCLCLb25
ns
TAVIV
Address Valid to Valid Instr In
312
5TCLCLb105
ns
TPLAZ
PSEN Low to Address Float
10
ns
TRLRH
RD Pulse Width
400
6TCLCLb100
ns
TWLWH
WR Pulse Width
400
6TCLCLb100
ns
TRLDV
RD Low to Valid Data In
252
5TCLCLb165
ns
TRHDX
Data Hold After RD High
0
ns
TRHDZ
Data Float After RD High
97
2TCLCLb70
ns
TLLDV
ALE Low to Valid Data In
517
8TCLCLb150
ns
TAVDV
Address Valid to Valid Data In
585
9TCLCLb165
ns
TLLWL
ALE Low to RD or WR Low
200
300
3TCLCLb50
3TCLCLa50
ns
TAVWL
Address Valid to RD or WR Low
203
4TCLCLb130
ns
TQVWX
Data Valid to WR Transition
23
TCLCLb60
ns
TWHQX
Data Hold After WR High
33
TCLCLb50
ns
TRLAZ
RD Low to Address Float
0
ns
TWHLH
RD or WR High to ALE High
43
123
TCLCLb40
TCLCLa40
ns
10
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