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June 2001
s
HIGH SPEED: t
PD
= 5.5 ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 2
A (MAX.) at T
A
=25C
s
TYPICAL HYSTERESIS : 0.7V at V
CC
= 4.5V
s
POWER DOWN PROTECTION ON INPUTS
& OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 8 mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 4.5V to 5.5V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 14
s
IMPROVED LATCH-UP IMMUNITY
s
LOW NOISE: V
OLP
= 0.8V (MAX.)
DESCRIPTION
The 74VHCT14A is an advanced high-speed
CMOS HEX SCHMITT INVERTER fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology.
The internal circuit is composed of 3 stages
including buffer output, which provides high noise
immunity and stable output.
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V since all
inputs are equipped with TTL threshold.
Pin configuration and function are the same as
those of the 74VHC04 but the 74VHC14 has
hysteresis.
This together with its schmitt trigger function
allows it to be used on line receivers with slow
rise/fall input signals.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74VHCT14A
HEX SCHMITT INVERTER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
SOP
74VHCT14AM
74VHCT14AMTR
TSSOP
74VHCT14ATTR
TSSOP
SOP
74VHCT14A
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INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) V
CC
= 0V
2) High or Low State
RECOMMENDED OPERATING CONDITIONS
1) V
CC
= 0V
2) High or Low State
PIN No
SYMBOL
NAME AND FUNCTION
1, 3, 5, 9, 11,
13
1A to 6A
Data Inputs
2, 4, 6, 8, 10,
12
1Y to 6Y
Data Outputs
7
GND
Ground (0V)
14
V
CC
Positive Supply Voltage
A
Y
L
H
H
L
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage
-0.5 to +7.0
V
V
O
DC Output Voltage (see note 1)
-0.5 to +7.0
V
V
O
DC Output Voltage (see note 2)
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
- 20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
4.5 to 5.5
V
V
I
Input Voltage
0 to 5.5
V
V
O
Output Voltage (see note 1)
0 to 5.5
V
V
O
Output Voltage (see note 2)
0 to V
CC
V
T
op
Operating Temperature
-55 to 125
C
74VHCT14A
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DC SPECIFICATIONS
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
= 3ns)
(*) Voltage range is 5.0V
0.5V
CAPACITIVE CHARACTERISTICS
1) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/6 (per gate)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
t+
High Level
Threshold Voltage
4.5
2.0
2.0
2.0
V
5.5
2.0
2.0
2.0
V
t-
Low Level
Threshold Voltage
4.5
0.6
0.6
0.6
V
5.5
0.6
0.6
0.6
V
h
Hysteresis Voltage
4.5
0.4
1.4
0.4
1.4
0.4
1.4
V
5.5
0.4
1.5
0.4
1.5
0.4
1.5
V
OH
High Level Output
Voltage
4.5
I
O
=-50
A
4.4
4.5
4.4
4.4
V
4.5
I
O
=-8 mA
3.94
3.8
3.7
V
OL
Low Level Output
Voltage
4.5
I
O
=50
A
0.0
0.1
0.1
0.1
V
4.5
I
O
=8 mA
0.36
0.44
0.55
I
I
Input Leakage
Current
0 to
5.5
V
I
= 5.5V or GND
0.1
1.0
1.0
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
2
20
20
A
I
CC
Additional Worst
Case Supply
Current
5.5
One Input at 3.4V,
other input at V
CC
or GND
1.35
1.5
1.5
mA
I
OPD
Output Leakage
Current
0
V
OUT
= 5.5V
0.5
5.0
5.0
A
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(*)
(V)
C
L
(pF)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
5.0
15
5.5
8.6
1.0
10.0
1.0
10.0
ns
5.0
50
6.7
9.0
1.0
11.0
1.0
11.0
Symbol
Parameter
Test Condition
Value
Unit
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
6
10
10
10
pF
C
PD
Power Dissipation
Capacitance
(note 1)
16
pF
74VHCT14A
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DYNAMIC SWITCHING CHARACTERISTICS
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.0V. Inputs under test switching: 3.0V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f=1MHz.
TEST CIRCUIT
C
L
=15/50pF or equivalent (includes jig and probe capacitance)
R
T
= Z
OUT
of pulse generator (typically 50
)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
OLP
Dynamic Low
Voltage Quiet
Output (note 1, 2)
5.0
C
L
= 50 pF
0.3
0.8
V
V
OLV
-0.8
-0.3
V
IHD
Dynamic High
Voltage Input
(note 1, 3)
5.0
2.0
V
ILD
Dynamic Low
Voltage Input
(note 1, 3)
5.0
0.6
74VHCT14A
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WAVEFORM: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
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