AT89C51SND1C-ROTIL ATMEL Corporation, AT89C51SND1C-ROTIL Datasheet - Page 29

• Manufacturer Part Number: AT89C51SND1C-ROTIL
• Description: Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
• Manufacturer: ATMEL Corporation

AC Characteristics
External 8-bit Bus Cycles
Definition of Symbols
Timings
4106F–8051–10/02
Table 39. External 8-bit Bus Cycles Timing Symbol Definitions
Test conditions: capacitive load on all pins = 50 pF.
Table 40. External 8-bit Bus Cycle – Data Read AC Timings
V
DD
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
RLRH
RHLH
AVDV
RLDV
RHDX
RHDZ
CLCL
AVRL
RLAZ
LHLL
AVLL
LLAX
LLRL
= 2.7 to 3.3V, T
Q
W
A
D
R
L
Parameter
Clock Period
ALE Pulse Width
Address Valid to ALE Low
Address Hold after ALE Low
ALE Low to RD Low
RD Pulse Width
RD High to ALE High
Address Valid to Valid Data In
Address Valid to RD Low
RD Low to Valid Data
RD Low to address Float
Data Hold After RD High
Instruction Float after RD
High
Signals
Address
Data In
ALE
Data Out
RD
WR
A
= -40° to +85°C
2·T
3·T
6·T
4·T
T
T
T
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Min
50
Standard Mode
0
Variable Clock
-20
-20
-20
-15
-30
-25
-30
9·T
5·T
2·T
T
CLCL
Max
CLCL
CLCL
CLCL
0
+20
-65
-30
-25
AT8xC51SND1C
0.5·T
0.5·T
1.5·T
0.5·T
3·T
2·T
T
H
V
X
Z
L
CLCL
Min
CLCL
CLCL
50
CLCL
CLCL
CLCL
CLCL
0
Variable Clock
-15
-25
-30
Conditions
-20
-20
-30
-20
X2 Mode
High
Low
Valid
No Longer Valid
Floating
0.5·T
4.5·T
2.5·T
T
CLCL
Max
CLCL
CLCL
CLCL
0
-25
+20
-65
-30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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