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74VHCT14A — Hex Schmitt Inverter
December 2007
74VHCT14A
Hex Schmitt Inverter
Features
■
High speed: t
PD
=
5.0ns (Typ.) at T
A
=
25°C
■
High noise immunity: V
IH
=
2.0V, V
IL
=
0.8V
■
Power down protection is provided on all inputs and
General Description
The VHCT14A is an advanced high speed CMOS Hex
Schmitt Inverter fabricated with silicon gate CMOS
technology. The VHCT14A contains six independent
inverters which are capable of transforming slowly
changing input signals into sharply defined, jitter-free
output signals.
Protection circuits ensure that 0V to 7V can be applied to
the input pins without regard to the supply voltage and
to the output pins with V
CC
=
0V. These circuits prevent
device destruction due to mismatched supply and
input/output voltages. This device can be used to inter-
face 3V to 5V systems and two supply systems such as
battery backup.
outputs
■
Low noise: V
OLP
=
1.0V (Max.)
■
Low power dissipation: I
CC
=
2µA (Max.) @ T
A
=
25°C
■
Pin and function compatible with 74HCT14
Ordering Information
Order Number
74VHCT14AM
74VHCT14ASJ
74VHCT14AMTC
Package
Number
M14A
M14D
MTC14
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012,
0.150" Narrow
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC
MO-153, 4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1998 Fairchild Semiconductor Corporation
74VHCT14A Rev. 1.5.0
www.fairchildsemi.com
74VHCT14A — Hex Schmitt Inverter
Connection Diagram
Logic Symbol
Truth Table
Pin Description
Pin Names
A
n
O
n
A
L
O
H
L
Description
Inputs
Outputs
H
©1998 Fairchild Semiconductor Corporation
74VHCT14A Rev. 1.5.0
www.fairchildsemi.com
2
74VHCT14A — Hex Schmitt Inverter
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, 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
Supply Voltage
DC Input Voltage
DC Output Voltage
Note 1
Note 2
I
IK
I
OK
I
OUT
I
CC
T
STG
T
L
Input Diode Current
Output Diode Current
(3)
DC Output Current
DC V
CC
/ GND Current
Storage Temperature
Parameter
Rating
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to V
CC
+ 0.5V
–0.5V to 7.0V
–20mA
±20mA
±25mA
±50mA
–65°C to +150°C
260°C
Lead Temperature (Soldering, 10 seconds)
Recommended Operating Conditions
(4)
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. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
IN
V
OUT
Supply Voltage
Input Voltage
Output Voltage
Note 1
Note 2
T
OPR
Operating Temperature
Parameter
Rating
4.5V to +5.5V
0V to +5.5V
0V to V
CC
0V to +5.5V
–40°C to +85°C
Notes:
1. HIGH or LOW state. I
OUT
absolute maximum rating must be observed.
2. V
CC
=
0V.
3. V
OUT
<
GND, V
OUT
>
V
CC
(Outputs Active).
4. Unused inputs must be held HIGH or LOW. They may not float.
©1998 Fairchild Semiconductor Corporation
74VHCT14A Rev. 1.5.0
www.fairchildsemi.com
3
74VHCT14A — Hex Schmitt Inverter
DC Electrical Characteristics
T
A
=
25°C
Symbol
V
P
V
N
V
H
V
OH
V
OL
I
IN
I
CC
I
CCT
I
OFF
T
A
=
–40°C
to +85°C
Min.
Max.
1.9
2.1
0.5
0.6
1.4
1.5
0.4
0.4
4.40
3.80
0.1
0.36
±0.1
2.0
1.35
0.5
0.1
0.44
±1.0
20.0
1.50
5.0
µA
µA
mA
µA
1.4
1.5
V
V
V
V
Parameter
Positive Threshold
Voltage
Negative Threshold
Voltage
Hysteresis Voltage
HIGH Level Output
Voltage
LOW Level Output
Voltage
Input Leakage Current
Quiescent Supply
Current
Maximum I
CC
/ Input
Output Leakage Current
(Power Down State)
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
4.5
0 – 5.5
5.5
5.5
0.0
Conditions
Min.
Typ.
Max.
1.9
2.1
Units
V
0.5
0.6
0.4
0.4
V
IN
=
V
IL
V
IN
=
V
IH
I
OH
=
–50µA
I
OH
=
–8mA
I
OL
=
50µA
I
OL
=
8mA
V
IN
=
5.5V or GND
V
IN
=
V
CC
or GND
V
IN
=
3.4V, Other
Inputs
=
V
CC
or GND
V
OUT
=
5.5V
4.40
3.94
0.0
4.50
Noise Characteristics
T
A
=
25°C
Symbol
V
OLP(5)
V
OLV(5)
V
IHD(5)
V
ILD(5)
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
(V)
5.0
5.0
5.0
5.0
Conditions
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
Typ.
0.8
–0.8
Limits Units
1.0
1.0
2.0
0.8
V
V
V
V
Note:
5. Parameter guaranteed by design.
AC Electrical Characteristics
T
A
=
25°C
Symbol
Parameter
V
CC
(V)
Conditions
C
L
=
50pF
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance
V
CC
=
OPEN
(6)
T
A
=
–40°C
to +85°C
Min.
1.0
1.0
Min.
Typ.
5.0
6.5
2
11
Max.
7.6
9.6
10
Max.
9.0
11.0
10
Units
ns
pF
pF
t
PHL
, t
PLH
Propagation Delay
5.0 ± 0.5 C
L
=
15pF
Note:
6. C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
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)
©1998 Fairchild Semiconductor Corporation
74VHCT14A Rev. 1.5.0
www.fairchildsemi.com
4
嵌入式系统
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