Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
IN
V
OUT
I
IK
I
OK
I
OUT
I
CC
T
STG
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
Input Diode Current
Output Diode Current
DC Output Current
DC V
CC
/ GND Current
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+0.5
-20
±20
±25
±50
-65 to +150
260
Unit
V
V
V
mA
mA
mA
mA
°C
°C
Storage Temperature Range
Lead Temperature (Soldering 10 seconds)
Note:
1. Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired.
The data book specifications should be met, without exception, to ensure that the system design is reliable over its
power supply, temperature, and output/input loading variables.
ON Semiconductor
does not recommend operation
outside data-book specifications.
www.onsemi.com
2
74VHC14 — Hex Schmitt Inverter
Recommended Operating Conditions
(2)
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications.
ON
Semiconductor
does not recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
IN
V
OUT
T
OPR
Supply Voltage
Input Voltage
Output Voltage
Parameter
Min.
2.0
0
0
-40
Max.
5.5
5.5
V
CC
85
Unit
V
V
V
°C
Operating Temperature Range
Note:
2. Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
Parameter
Positive Threshold
Voltage
V
CC
3.0
T
A
= 25°C
Min.
Typ.
Max.
2.20
3.15
3.85
0.90
1.35
1.65
0.30
0.40
0.50
1.9
2.9
4.4
2.58
3.94
0.0
0.0
0.0
0.1
0.1
0.1
0.36
0.36
±0.1
2.0
2.0
3.0
4.5
1.20
1.40
1.60
T
A
= -40 to 85°C
Min.
Max.
2.20
3.15
3.85
0.90
1.35
1.65
0.30
0.40
0.50
1.9
2.9
4.4
2.48
3.80
0.1
0.1
0.1
0.44
0.44
±1.0
20.0
1.20
1.40
1.60
Unit
Conditions
V
P
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
2.0
3.0
V
V
N
Negative
Threshold Voltage
V
V
H
Hysteresis Voltage
V
V
OH
HIGH Level Output
Voltage
4.5
3.0
4.5
2.0
3.0
V
V
IN
= V
IL
I
OH
= -50
μA
I
OH
= -4 mA
I
OH
= -8 mA
I
OL
= 50
μA
I
OL
= 4 mA
I
OL
= 8 mA
V
OL
LOW Level Output
Voltage
4.5
3.0
4.5
V
V
IN
= V
IH
I
IN
I
CC
Input Leakage
Current
Quiescent Supply
Current
0 - 5.5
5.5
μA
μA
V
IN
= 5.5 V or GND
V
IN
= V
CC
or GND
www.onsemi.com
3
74VHC14 — Hex Schmitt Inverter
Noise Characteristics
(2)
Symbol
V
OLP
V
OLV
V
IHD
V
ILD
Parameter
Quiet Output Maximum Dynamic V
OL
Quiet Output Minimum Dynamic V
OL
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
V
CC
5.0
5.0
5.0
5.0
T
A
= 25°C
Typ.
0.4
-0.4
Max.
0.8
0.8
3.5
1.5
Unit
V
V
V
V
Conditions
C
L
= 50 pF
C
L
= 50 pF
C
L
= 50 pF
C
L
= 50 pF
Note:
2. Parameter guaranteed by design.
AC Electrical Characteristics
Symbol
Parameter
V
CC
3.3 ± 0.3
t
PLH
t
PHL
C
IN
C
PD
Propagation Delay Time
5.0 ± 0.5
Input Capacitance
Power Dissipation Capacitance
T
A
= 25°C
Min.
Typ.
8.3
10.8
5.5
7.0
4
21
Max.
12.8
16.3
8.6
10.6
10
T
A
= -40 to 85°C
Min.
1.0
1.0
1.0
1.0
Max.
15.0
18.5
10.0
12.0
10
pF
pF
ns
Unit Conditions
C
L
= 15 pF
C
L
= 50 pF
C
L
= 15 pF
C
L
= 50 pF
V
CC
= Open
(3)
Note:
3. C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the opening current
consumption without load.
Average operating current can be obtained by the equation: I
CC
(Opr) = C
PD
* V
CC
* f
IN
+ I
CC
/6 (per Gate)
www.onsemi.com
4
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at
www.onsemi.com/site/pdf/Patent−Marking.pdf.
ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA
Phone:
303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax:
303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email:
orderlit@onsemi.com
N. American Technical Support:
800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
ON Semiconductor Website: www.onsemi.com
Order Literature:
http://www.onsemi.com/orderlit
For additional information, please contact your local
C++ 属于面向对象的编程语言,OOP的思想不必多说,特别对于复杂的软件工程来说,利用OOP绝对是事半功倍,相对于传统的C来说; 当然用C来写单片机程序无可厚非,已经延续了一个传统,从大学时学的开始到工作岗位,好多人都是一直用C来做,但是既然Keil支持C++编译, 可以用C++来编写你的代码,可以利用高级语言来结构化,清晰化你的程序,为嘛不用呢!哈哈,个人看法!下面进入正题: C+...[详细]