74VHCT14A
HEX SCHMITT inverter
Features
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■
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High speed: t
PD
= 5.5ns (typ.) at V
CC
= 5V
Low power dissipation:
I
CC
= 2
µA
(Max.) at T
A
= 25°C
Typical hysteresis: V
h
= 0.7V at V
CC
= 4.5V
Power down protection on inputs & outputs
Symmetrical output impedance:
|I
OH
| = I
OL
= 8 mA (Min)
Balanced propagation delays:
t
PLH
≅
t
PHL
Operating voltage range:
V
CC
(Opr) = 4.5V to 5.5V
Pin and function compatible with
74 series 14
Improved latch-up immunity
Low noise: V
OLP
= 0.8V (Max.)
SO-14
TSSOP14
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.
Table 1. Device summary
Part number
74VHCT14AMTR
74VHCT14ATTR
Package
SO-14
TSSOP14
Packaging
Tape and reel
Tape and reel
May 2007
Rev 2
1/15
www.st.com
15
Contents
74VHCT14A
Contents
1
2
Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
5
6
7
8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
74VHCT14A
Logic symbols and I/O equivalent circuit
1
Logic symbols and I/O equivalent circuit
Figure 1.
IEC logic symbols
Figure 2.
Input and output equivalent circuit
3/15
Pin settings
74VHCT14A
2
2.1
Pin settings
Pin connection
Figure 3.
Pin connection
(top through view)
2.2
Pin description
Table 2. Pin description
Pin N°
1, 3, 5, 9, 11, 13
2, 4, 6, 8, 10, 12
7
14
Symbol
1A to 6A
1Y to 6Y
GND
V
CC
Data inputs
Data outputs
Ground (0V)
Positive supply voltage
Name and function
2.3
Truth table
Table 3. Truth table
Inputs
A
L
H
Output
Y
H
L
4/15
74VHCT14A
Maximum rating
3
Maximum rating
stressing the device above the rating listed in the “absolute maximum ratings” table may
cause permanent damage to the device. these are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. exposure to absolute maximum rating conditions for
extended periods may affect device reliability. refer also to the STMicroelectronics sure
program and other relevant quality documents.
Table 4. Absolute maximum ratings
Symbol
V
CC
V
I
V
O
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
T
L
Supply voltage
DC input voltage
DC output voltage
(1)
DC output voltage
(2)
DC input diode current
DC output diode current
DC output current
DC supply current per supply pin
DC ground current per supply pin
Storage temperature
Lead temperature (10 sec)
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
- 20
±
20
±
25
±
50
±
50
-65 to +150
300
Unit
V
V
V
V
mA
mA
mA
mA
mA
°C
°C
1. V
CC
= 0V
2. High or low state
3.1
Recommended operating conditions
Table 5. Recommended operating conditions
Symbol
V
CC
V
I
V
O
V
O
T
op
1. V
CC
= 0V
2. High or low state
Parameter
Supply voltage
Input voltage
Output voltage
(1)
Output voltage
(2)
Operating temperature
Value
4.5 to 5.5
0 to 5.5
0 to 5.5
0 to V
CC
-55 to 125
Unit
V
V
V
V
°C
5/15
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