at83c5132 ATMEL Corporation, at83c5132 Datasheet - Page 19

• Manufacturer Part Number: at83c5132
• Description: Usb Microcontroller With 64k Bytes Flash Memory
• Manufacturer: ATMEL Corporation

AC Characteristics
External 8-bit Bus Cycles
Definition of Symbols
Timings
4173CS–USB–07/04
Table 1. External 8-bit Bus Cycles Timing Symbol Definitions
Test conditions: capacitive load on all pins = 50 pF.
Table 2. 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
RHDX
RLRH
RHLH
AVDV
AVRL
RLDV
RHDZ
CLCL
LHLL
AVLL
LLAX
LLRL
RLAZ
= 2.7 to 3.3V, T
W
D
Q
R
A
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
Min
CLCL
CLCL
CLCL
CLCL
50
Standard Mode
Variable Clock
0
-20
-20
-20
-15
-30
-25
-30
9·T
5·T
2·T
T
CLCL
Max
CLCL
CLCL
CLCL
0
+20
-65
-30
-25
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
Conditions
-25
-30
AT89C5132
X2 Mode
-20
-20
-30
-20
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No Longer Valid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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