参数资料
型号: AT89C51SND1C
厂商: Atmel Corp.
元件分类: DC/DC变换器
英文描述: DC-DC Converter, 15Watt, Input VDC: ?9~36, Output VDC: 15, Max Output Current(A): 1, Package: 2x1, Isolation(VDC): 1500, Operating Temp. -40??C to +75??C, Low Ripple & Noise, High Efficiency up to 85%, Low Profile Metal Package, Continuous Auto-Recovery, Single & Dual Ouput Regulated
中文描述: 单片微控制器,带有MP3解码器和人机界面
文件页数: 29/47页
文件大小: 791K
代理商: AT89C51SND1C
29
AT8xC51SND1C
4106F–8051–10/02
AC Characteristics
External 8-bit Bus Cycles
Definition of Symbols
Table 39.
External 8-bit Bus Cycles Timing Symbol Definitions
Timings
Test conditions: capacitive load on all pins = 50 pF.
Table 40.
External 8-bit Bus Cycle – Data Read AC Timings
V
DD
= 2.7 to 3.3V, T
A
= -40
°
to +85
°
C
Signals
Conditions
A
Address
H
High
D
Data In
L
Low
L
ALE
V
Valid
Q
Data Out
X
No Longer Valid
R
RD
Z
Floating
W
WR
Symbol
Parameter
Variable Clock
Standard Mode
Variable Clock
X2 Mode
Unit
Min
Max
Min
Max
T
CLCL
Clock Period
50
50
ns
T
LHLL
ALE Pulse Width
2
·
T
CLCL
-15
T
CLCL
-15
ns
T
AVLL
Address Valid to ALE Low
T
CLCL
-20
0.5
·
T
CLCL
-20
ns
T
LLAX
Address Hold after ALE Low
T
CLCL
-20
0.5
·
T
CLCL
-20
ns
T
LLRL
ALE Low to RD Low
3
·
T
CLCL
-30
1.5
·
T
CLCL
-30
ns
T
RLRH
RD Pulse Width
6
·
T
CLCL
-25
3
·
T
CLCL
-25
ns
T
RHLH
RD High to ALE High
T
CLCL
-20
T
CLCL
+20
0.5
·
T
CLCL
-20
0.5
·
T
CLCL
+20
ns
T
AVDV
Address Valid to Valid Data In
9
·
T
CLCL
-65
4.5
·
T
CLCL
-65
ns
T
AVRL
Address Valid to RD Low
4
·
T
CLCL
-30
2
·
T
CLCL
-30
ns
T
RLDV
RD Low to Valid Data
5
·
T
CLCL
-30
2.5
·
T
CLCL
-30
ns
T
RLAZ
RD Low to address Float
0
0
ns
T
RHDX
Data Hold After RD High
0
0
ns
T
RHDZ
Instruction Float after RD
High
2
·
T
CLCL
-25
T
CLCL
-25
ns
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