W78E51C WINBOND [Winbond], W78E51C Datasheet - Page 14

• Manufacturer Part Number: W78E51C
• Description: 8 bit micocontroller
• Manufacturer: WINBOND [Winbond]

8.3 A.C. Characteristics
The AC specifications are a function of the particular process used to manufacture the part, the ratings
of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the specifications
can be expressed in terms of multiple input clock periods (T
experience less than a 20 nS variation. The numbers below represent the performance expected
from a 0.6micron CMOS process when using 2 and 4 mA output buffers.
8.3.1 Clock Input Waveform
Notes:
8.3.2 Program Fetch Cycle
Notes:
Operating Speed
Clock Period
Clock High
Clock Low
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN Low to Data Valid
PSEN Pulse Width
1. The clock may be stopped indefinitely in either state.
2. The T
3. There are no duty cycle requirements on the XTAL1 input.
1. P0.0 P0.7, P2.0 P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 T
3. Data have been latched internally prior to PSEN going high.
4. " " (due to buffer driving delay and wire loading) is 20 nS.
PARAMETER
PARAMETER
CP
PSEN
specification is used as a reference in other specifications.
Low
XTAL1
CP
.
SYMBOL
F
T
T
T
SYMBOL
OP
CP
CH
CL
T
T
T
T
T
T
T
T
PSW
PDH
ALW
AAS
AAH
PDA
PDZ
APL
T
CH
- 14 -
MIN.
25
10
10
1 T
1 T
1 T
2 T
3 T
0
F
MIN.
OP,
CP
CP
CP
CP
CP
0
0
-
-
-
-
-
-
T
CP
TYP.
T
CL
-
-
-
-
2 T
3 T
TYP.
-
-
-
-
-
-
CP
CP
CP
), and actual parts will usually
MAX.
40
2 T
1 T
1 T
MAX.
-
-
-
-
-
-
-
-
CP
CP
CP
UNIT
MHz
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
W78E51C
NOTES
NOTES
1, 4
1
2
3
3
4
4
2
3
4
4