87C54-20 Intel Corporation, 87C54-20 Datasheet - Page 11

• Manufacturer Part Number: 87C54-20
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM
• Manufacturer: Intel Corporation

EXTERNAL MEMORY CHARACTERISTICS
NOTE
Timings speicified for the 87C54-20 are valid at 20 MHz only For timings below 20 MHz use the 87C54 timings
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
RLRH
WLWH
RLDV
RHDX
RHDZ
LLDV
AVDV
LLWL
AVWL
QVWX
WHQX
QVWH
RLAZ
WHLH
RD Pulse Width
WR Pulse Width
RD Low to Valid
Data In
Data Hold After RD
High
Data Float After RD
High
ALE Low to Valid
Data In
Address Valid to
Valid Data In
ALE Low to RD or
WR Low
Address Valid to
WR Low
Data Valid before
WR Low
Data Hold after WR
High
Data Valid to WR
High
RD Low to Address
Float
RD or WR High to
ALE High
Parameter
Min
400
400
200
203
433
33
33
43
0
12 MHz Oscillator
Max
252
107
517
585
300
123
0
(Continued)
4 T
7 T
6 T
6 T
4 T
7 T
3 T
T
T
T
T
T
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
AUTOMOTIVE 87C54 87C54-20
Min
0
Variable Oscillator
b
b
b
b
b
b
87C54 87C54-20
b
b
b
b
b
b
50
35
50
40
130
150
40
100
100
90
70
50
5 T
8 T
9 T
8 T
9 T
3 T
2 T
5 T
T
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Max
0
b
b
b
a
b
b
b
a
95
165
150
165
40
90
90
60
50
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
11