W78C438C_06 Datasheet, PDF (14/22 Pages) Winbond – 8-BIT MICROCONTROLLER

W78C438C
D.C. Characteristics, continued
PARAMETER
Input Voltage
Input Voltage
Input Voltage
Input Voltage
SYM.
VILC
VIHC
VILR
VIHR
TEST CONDITIONS
VDD = 5V ±10%, XTAL1 Note 5
VDD = 5V ±10%, XTAL1 Note 5
VDD = 5V ±10%, RESET Note 5
VDD = 5V ±10%, RESET Note 5
MIN.
0
3.5
0
2.4
TYP.
-
-
-
-
MAX.
0.8
Note 4
0.8
Note 4
Notes:
1. 0 < VIN < VDD, for INT2 , INT3 , RESET, EA , Port 0, DP4, P1, P2, P3 and P8 inputs in leakage.
2. Using an internal pull low/high resistor (approx. 30K).
3. ALE, PSEN , P0 and DP4 in external program or data access mode.
4. The maximum input voltage is VDD +0.2V.
5. XTAL1 is a CMOS input and RESET is a Schmitt trigger input.
UNIT
V
V
V
V
6.3 A.C. Characteristics
AC specifications are a function of the particular process used to manufacture the product, 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 (TCP), and actual parts will usually
experience less than a ±20 nS variation.
6.3.1 Clock Input Waveform
PARAMETER
Operating Speed
Clock Period
Clock High
Clock Low
SYMBOL
FOP
TCP
TCH
TCL
MIN.
0
25
10
10
TYP.
-
-
-
-
Notes:
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
MAX.
40
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
6.3.2 Program Fetch Cycle
PARAMETER
Address Valid to PSEN Low
PSEN Low to Data Valid
SYMBOL
TAPL
TPDV
MIN.
2 TCP
-
TYP.
-
-
MAX.
-
2 TCP
UNIT
nS
nS
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