W78E52BF-40 WINBOND [Winbond], W78E52BF-40 Datasheet - Page 14

• Manufacturer Part Number: W78E52BF-40
• Description: 8-BIT MTP MICROCONTROLLER
• Manufacturer: WINBOND [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 0.6micron 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.
Operating Speed
Clock Period
Clock High
Clock Low
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to PSEN Low
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN Low to Data Valid
PSEN Pulse Width
CP
PARAMETER
specification is used as a reference in other specifications.
PARAMETER
XTAL1
CP
.
SYMBOL
F
T
T
T
SYMBOL
OP
CH
CP
CL
T
T
T
T
T
T
T
T
ALW
PSW
PDH
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
-
-
-
-
2 T
3 T
Preliminary W78E52B
TYP.
CL
-
-
-
-
-
-
CP
CP
MAX.
40
2 T
1 T
1 T
MAX.
-
-
-
-
-
-
-
-
CP
CP
CP
CP
), and actual parts will
UNIT
MHz
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
NOTES
NOTES
1, 4
1
2
3
3
4
4
2
3
4
4