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參數資料
| 型號： | W78C51C |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT Microcontroller(8位的微控制器) |
| 中文描述： | 8位微控制器（8位的微控制器） |
| 文件頁數： | 7/14頁 |
| 文件大?。?/td> | 234K |
| 代理商： | W78C51C |
W78C51C
Publication Release Date: October 1997
- 7 -
Revision A3
DC Characteristics, continued
PARAMETER
SYMBOL
TEST CONDITIONS
SPECIFICATION
UNIT
MIN.
2.4
MAX.
V
DD
+0.2
V
DD
+0.2
Input High Voltage
(Except RST)
Input High Voltage
RST
(*4)
Input High Voltage
XTAL1
(*4)
V
IH1
V
DD
= 5.5V
V
V
IH2
V
DD
= 5.5V
3.5
V
V
IH3
V
DD
= 5.0V
3.5
V
DD
+0.2
V
Notes:
1. Pins of P1, P2 and P3 source a transition current when they are being externally driven from 1 to 0. The transition current
reaches its maximum value when V
IN
is approximately 2V.
2. RST pin has an internal pull-down resistor.
3. P0, ALE, PSEN are in the external access mode.
4. XTAL1 is a CMOS input and RST is a Schmitt trigger input.
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
CP
), and actual parts will
usually experience less than a
ó
20 nS variation. The numbers below represent the performance
expected from a 1.2 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
T
T
XTAL1
F
CH
CL
OP,
T
CP
PARAMETER
Operating Speed
Clock Period
Clock High
Clock Low
SYMBOL
F
OP
T
CP
T
CH
T
CL
MIN.
0
25
10
TYP.
-
-
-
-
MAX.
40
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
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.
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