w78l812a Winbond Electronics Corp America, w78l812a Datasheet - Page 21

• Manufacturer Part Number: w78l812a
• Description: 8-bit Mcu Series 80c51-based
• Manufacturer: Winbond Electronics Corp America

9. AC 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.
9.1
Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
3. There are no duty cycle requirements on the XTAL1 input.
Operating Speed
Clock Period
Clock High
Clock Low
Clock Input Waveform
CP
XTAL1
specification is used as a reference in other specifications.
PARAMETER
SYMBOL
F
T
T
T
OP
CH
CP
CL
T
CH
- 21 -
MIN.
F
50
25
25
0
OP,
T
Publication Release Date: November 6, 2006
CP
W78LE812/W78L812A
TYP.
-
-
-
-
T
CP
CL
), and actual parts will usually
MAX.
20
-
-
-
UNIT
MHz
nS
nS
nS
Revision A9
NOTES
1
2
3
3