W78E516B-24 Winbond, W78E516B-24 Datasheet - Page 15

• Manufacturer Part Number: W78E516B-24
• Description: 8-BIT MICROCONTROLLER
• Manufacturer: Winbond

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
usually experience less than a 20 nS variation. The numbers below represent the performance
expected from a 0.6 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
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.
Program Fetch Cycle
Notes:
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.
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to PSEN Low
PSEN Low to Data Valid
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN Pulse Width
Operating Speed
Clock Period
Clock High
Clock Low
CP
PARAMETER
specification is used as a reference in other specifications.
PARAMETER
XTAL1
CP
.
SYMBOL
TCP
Fop
Tch
Tcl
SYMBOL
T
T
T
T
T
T
T
T
PSW
ALW
AAH
PDA
PDH
AAS
PDZ
APL
T
CH
- 15 -
1 T
1 T
1 T
2 T
3 T
MIN.
F
MIN.
25
10
10
OP,
0
CP
CP
CP
0
0
CP
CP
-
-
-
-
-
-
T
CP
T
2 T
3 T
CL
TYP.
TYP.
Publication Release Date: February 2000
-
-
-
-
-
-
-
-
-
-
CP
CP
MAX.
2 T
1 T
1 T
MAX.
40
-
-
-
-
-
-
-
-
CP
CP
CP
CP
), and actual parts will
UNIT
W78E516B
MHz
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
Revision A3
NOTES
NOTES
1, 4
1
2
3
3
4
4
2
3
4
4