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AT89C55WD-24AI Datasheet(PDF) 29 Page - ATMEL Corporation

Part # AT89C55WD-24AI
Description  8-bit Microcontroller with 20K Bytes Flash
PDF  37 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C55WD-24AI Datasheet(HTML) 29 Page - ATMEL Corporation

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AT89C55WD
1921B–MICRO–09/02
AC
Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN =100 pF;
load capacitance for all other outputs = 80 pF.
External Program and Data Memory Characteristics
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
Units
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency
0
33
MHz
t
LHLL
ALE Pulse Width
127
2t
CLCL-40
ns
t
AVLL
Address Valid to ALE Low
43
t
CLCL-25
ns
tLLAX
Address Hold After ALE Low
48
tCLCL-25
ns
tLLIV
ALE Low to Valid Instruction In
233
4tCLCL-65
ns
tLLPL
ALE Low to PSEN Low
43
tCLCL-25
ns
t
PLPH
PSEN Pulse Width
205
3t
CLCL-45
ns
t
PLIV
PSEN Low to Valid Instruction In
145
3t
CLCL-60
ns
t
PXIX
Input Instruction Hold After PSEN
00
ns
tPXIZ
Input Instruction Float After PSEN
59
tCLCL-25
ns
tPXAV
PSEN to Address Valid
75
tCLCL-8
ns
tAVIV
Address to Valid Instruction In
312
5tCLCL-80
ns
t
PLAZ
PSEN Low to Address Float
10
10
ns
t
RLRH
RD Pulse Width
400
6t
CLCL-100
ns
t
WLWH
WR Pulse Width
400
6t
CLCL-100
ns
tRLDV
RD Low to Valid Data In
252
5tCLCL-90
ns
tRHDX
Data Hold After RD
00
ns
tRHDZ
Data Float After RD
97
2tCLCL-28
ns
tLLDV
ALE Low to Valid Data In
517
8tCLCL-150
ns
t
AVDV
Address to Valid Data In
585
9t
CLCL-165
ns
t
LLWL
ALE Low to RD or WR Low
200
300
3t
CLCL-50
3t
CLCL+50
ns
tAVWL
Address to RD or WR Low
203
4tCLCL-75
ns
tQVWX
Data Valid to WR Transition
23
tCLCL-30
ns
tQVWH
Data Valid to WR High
433
7tCLCL-130
ns
tWHQX
Data Hold After WR
33
tCLCL-25
ns
t
RLAZ
RD Low to Address Float
0
0
ns
t
WHLH
RD or WR High to ALE High
43
123
t
CLCL-25
t
CLCL+25
ns



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