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參數資料
| 型號： | W78C438C40PL |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQCC84 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LCC-84 |
| 文件頁數： | 14/22頁 |
| 文件大小： | 266K |
| 代理商： | W78C438C40PL |
W78C438C
- 14 -
D.C. Characteristics, continued
PARAMETER
SYM.
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input Voltage
V
ILC
V
DD
= 5V
±
10%, XTAL1
Note 5
0
-
0.8
V
Input Voltage
V
IHC
V
DD
= 5V
±
10%, XTAL1
Note 5
3.5
-
Note 4
V
Input Voltage
V
ILR
V
DD
= 5V
±
10%, RESET
Note 5
0
-
0.8
V
Input Voltage
V
IHR
V
DD
= 5V
±
10%, RESET
Note 5
2.4
-
Note 4
V
Notes:
1. 0 < V
IN
< V
DD
, 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 V
DD
+0.2V.
5. XTAL1 is a CMOS input and RESET is a Schmitt trigger input.
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 (T
CP
), and actual parts will usually
experience less than a
±
20 nS variation.
6.3.1 Clock Input Waveform
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
NOTES
Operating Speed
F
OP
0
-
40
MHz
1
Clock Period
T
CP
25
-
-
nS
2
Clock High
T
CH
10
-
-
nS
3
Clock Low
T
CL
10
-
-
nS
3
Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
CP
specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
6.3.2 Program Fetch Cycle
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
Address Valid to
PSEN
Low
T
APL
2 T
CP
-
-
nS
PSEN
Low to Data Valid
T
PDV
-
-
2 T
CP
nS
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