87C51 Intel Corporation, 87C51 Datasheet - Page 13

• Manufacturer Part Number: 87C51
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

EXTERNAL MEMORY CHARACTERISTICS
All parameter values apply to all devices unless otherwise indicated In this table 87C51 BH refers to
87C51 BH 87C51-1 BH-1 and 87C51-2 BH-2 (Continued)
TPXIX
TPXIZ
TAVIV
TPLAZ
TRLRH
TWLWH
TRLDV
TRHDX
TRHDZ
TLLDV
TAVDV
TLLWL
TAVWL
TQVWX
Symbol
Input Instr Hold After PSEN
Input Instr Float After PSEN
Address to Valid Instr In
PSEN Low to Address Float
RD Pulse Width
WR Pulse Width
RD Low to Valid Data In
Data Hold After RD
Data Float After RD
ALE Low to Valid Data In
Address to Valid Data In
ALE Low to RD or WR Low
Address to RD or WR Low
Data Valid to WR Transition
87C51 BH
87C51-24 BH-24
87C51 BH
87C51-24 BH-24
87C51 BH
87C51-24 BH-24
87C51 BH
87C51-24 BH-24
87C51 BH
87C51-24 BH-24
87C51 BH
80C51-24 BH-24
Parameter
Min
400
400
200
203
33
0
0
12 MHz
Max
312
252
107
517
585
300
59
10
Min
150
150
75
77
12
0
0
24 MHz
Max
103
113
243
285
175
21
10
23
Oscillator
6TCLCL
6TCLCL
4TCLCL
3TCLCL
4TCLCL
TCLCL
TCLCL
Min
0
0
87C51 80C51BH 80C31BH
b
b
b
b
b
b
b
100
100
130
50
30
50
90
Variable
5TCLCL
5TCLCL
8TCLCL
9TCLCL
3TCLCL
5TCLCL
2TCLCL
8TCLCL
9TCLCL
TCLCL
TCLCL
Max
10
b
b
b
b
b
b
a
b
b
b
b
25
20
105
165
150
165
95
60
90
90
50
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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