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AT89S52-24SC Datasheet(PDF) 30 Page - ATMEL Corporation

Part No. AT89S52-24SC
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  39 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT89S52-24SC Datasheet(HTML) 30 Page - ATMEL Corporation

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30
1919C–MICRO–3/05
AT89S52
28. AC Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other
outputs = 80 pF.
28.1
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
tLHLL
ALE Pulse Width
127
2tCLCL-40
ns
t
AVLL
Address Valid to ALE Low
43
t
CLCL-25
ns
t
LLAX
Address Hold After ALE Low
48
t
CLCL-25
ns
tLLIV
ALE Low to Valid Instruction In
233
4tCLCL-65
ns
t
LLPL
ALE Low to PSEN Low
43
t
CLCL-25
ns
t
PLPH
PSEN Pulse Width
205
3t
CLCL-45
ns
tPLIV
PSEN Low to Valid Instruction In
145
3tCLCL-60
ns
t
PXIX
Input Instruction Hold After PSEN
00
ns
t
PXIZ
Input Instruction Float After PSEN
59
t
CLCL-25
ns
tPXAV
PSEN to Address Valid
75
tCLCL-8
ns
t
AVIV
Address to Valid Instruction In
312
5t
CLCL-80
ns
t
PLAZ
PSEN Low to Address Float
10
10
ns
tRLRH
RD Pulse Width
400
6tCLCL-100
ns
t
WLWH
WR Pulse Width
400
6t
CLCL-100
ns
t
RLDV
RD Low to Valid Data In
252
5t
CLCL-90
ns
tRHDX
Data Hold After RD
00
ns
t
RHDZ
Data Float After RD
97
2t
CLCL-28
ns
t
LLDV
ALE Low to Valid Data In
517
8t
CLCL-150
ns
tAVDV
Address to Valid Data In
585
9tCLCL-165
ns
t
LLWL
ALE Low to RD or WR Low
200
300
3t
CLCL-50
3t
CLCL+50
ns
t
AVWL
Address to RD or WR Low
203
4t
CLCL-75
ns
tQVWX
Data Valid to WR Transition
23
tCLCL-30
ns
t
QVWH
Data Valid to WR High
433
7t
CLCL-130
ns
t
WHQX
Data Hold After WR
33
t
CLCL-25
ns
tRLAZ
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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