AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 186

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

AC Characteristics
External 8-bit Bus Cycles
Definition of Symbols
Timings
186
AT8xC51SND1C
Table 159. External 8-bit Bus Cycles Timing Symbol Definitions
Test conditions: capacitive load on all pins= 50 pF.
Table 160. External 8-bit Bus Cycle - Data Read AC Timings
V
A
D
L
Q
R
W
Symbol
DD
T
T
T
T
T
T
T
T
T
T
T
T
T
RHDX
RLRH
RHLH
AVDV
AVRL
RLDV
RHDZ
CLCL
LHLL
AVLL
LLAX
LLRL
RLAZ
= 2.7 to 3.3 V, T
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
Parameter
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
H
L
V
X
Z
-65
-30
-25
0.5·T
0.5·T
1.5·T
0.5·T
3·T
2·T
T
CLCL
CLCL
CLCL
Min
50
CLCL
CLCL
CLCL
CLCL
0
Variable Clock
-15
Conditions
-25
-30
X2 Mode
-20
-20
-30
-20 0.5·T
High
Low
Valid
No Longer Valid
Floating
4.5·T
2.5·T
T
4109E–8051–06/03
CLCL
Max
CLCL
CLCL
CLCL
0
-25
+20
-65
-30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns