AT89S51 Atmel Corporation, AT89S51 Datasheet - Page 23
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AT89S51
Manufacturer Part Number
AT89S51
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT89S51.pdf
(31 pages)
Specifications of AT89S51
Flash (kbytes)
4 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
32
Uart
1
Sram (kbytes)
0.125
Operating Voltage (vcc)
4.0 to 5.5
Timers
2
Isp
SPI
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89S51
Manufacturer:
ATM
Quantity:
6 000
Part Number:
AT89S51
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89S51-16AI
Manufacturer:
ATMEL
Quantity:
10 000
Company:
Part Number:
AT89S51-24AI
Manufacturer:
STM
Quantity:
4 676
Part Number:
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Manufacturer:
AT
Quantity:
20 000
Company:
Part Number:
AT89S51-24AU
Manufacturer:
ATMEL
Quantity:
122 400
Part Number:
AT89S51-24AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
24. AC Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other
outputs = 80 pF.
24.1
2487D–MICRO–6/08
Symbol
1/t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
LHLL
AVLL
LLAX
LLIV
LLPL
PLPH
PLIV
PXIX
PXIZ
PXAV
AVIV
PLAZ
RLRH
WLWH
RLDV
RHDX
RHDZ
LLDV
AVDV
LLWL
AVWL
QVWX
QVWH
WHQX
RLAZ
WHLH
CLCL
External Program and Data Memory Characteristics
Parameter
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold After ALE Low
ALE Low to Valid Instruction In
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction Float After PSEN
PSEN to Address Valid
Address to Valid Instruction 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
Data Valid to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE High
Min
127
205
400
400
200
203
433
12 MHz Oscillator
43
48
43
75
23
33
43
0
0
Max
233
145
312
252
517
585
300
123
59
10
97
0
6 t
6 t
7 t
2 t
3 t
3 t
4 t
t
t
t
t
t
t
CLCL
CLCL
CLCL
t
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Min
Variable Oscillator
0
0
0
-25
-25
-25
-30
-25
-25
-100
-100
-130
-8
-40
-45
-50
-75
8 t
9 t
3 t
4 t
3 t
5 t
5 t
2 t
t
t
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Max
33
10
0
+25
-25
-150
-165
+50
-65
-60
-80
-90
-28
AT89S51
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
23