Semiconductor Components Industries, LLC, 2001
October, 2001 – Rev. 1 1Publication Order Number:
SN74LS14/D
SN74LS14
Schmitt Triggers
Dual Gate/Hex Inverter
The SN74LS14 contains logic gates/inverters which accept
standard TTL input signals and provide standard TTL output levels.
They are capable of transforming slowly changing input signals into
sharply defined, jitter-free output signals. Additionally, they have
greater noise margin than conventional inverters.
Each circuit contains a Schmitt trigger followed by a Darlington
level shifter and a phase splitter driving a TTL totem pole output. The
Schmitt trigger uses positive feedback to effectively speed-up slow
input transitions, and provide different input threshold voltages for
positive and negative-going transitions. This hysteresis between the
positive-going and negative-going input thresholds (typically
800 mV) is determined internally by resistor ratios and is essentially
insensitive to temperature and supply voltage variations.
LOGIC AND CONNECTION DIAGRAMS
SN74LS14
14 13 12 11 10 9
123456
VCC
8
7
GND
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
IOH Output Current – High –0.4 mA
IOL Output Current – Low 8.0 mA
LOW
POWER
SCHOTTKY
SOIC
D SUFFIX
CASE 751A
PLASTIC
N SUFFIX
CASE 646
14
1
14
1
Device Package Shipping
ORDERING INFORMATION
SN74LS14N 14 Pin DIP 2000 Units/Box
SN74LS14D SOIC–14 55 Units/Rail
SN74LS14DR2 SOIC–14 2500/Tape & Reel
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SN74LS14
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2
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VT+ Positive-Going Threshold Voltage 1.5 2.0 V VCC = 5.0 V
VT– Negative-Going Threshold Voltage 0.6 1.1 V VCC = 5.0 V
VT+–VT– Hysteresis 0.4 0.8 V VCC = 5.0 V
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH Output HIGH Voltage 2.7 3.4 V VCC = MIN, IOH = –400 µA, VIN = VIL
VOL
Out
p
ut LOW Voltage
0.25 0.4 V VCC = MIN, IOL = 4.0 mA, VIN = 2.0 V
VOL Output LOW Voltage 0.35 0.5 V VCC = MIN, IOL = 8.0 mA, VIN = 2.0 V
IT+ Input Current at Positive-Going Threshold –0.14 mA VCC = 5.0 V, VIN = VT+
IT– Input Current at Negative-Going Threshold –0.18 mA VCC = 5.0 V, VIN = VT–
IIH
In
p
ut HIGH Current
1.0 20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current 0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1) –20 –100 mA VCC = MAX, VOUT = 0 V
ICC
Power Supply Current
Total, Output HIGH
8.6 16
mA
VCC = MAX
ICC
Total
,
Out ut
HIGH
Total, Output LOW
12 21 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C)
Symbol Parameter Max Unit Test Conditions
tPLH Propagation Delay, Input to Output 22 ns V
CC
= 5.0 V
tPHL Propagation Delay, Input to Output 22 ns
VCC
=
5
.
0
V
CL = 15 pF
3 V
0 V
VIN
VOUT
1.6 V 0.8 V
tPHL
1.3 V 1.3 V
tPLH
Figure 1. AC Waveforms
SN74LS14
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3
Figure 2. VIN versus VOUT Transfer Function Figure 3. Threshold Voltage and Hysteresis
versus Power Supply Voltage
Figure 4. Threshold Voltage Hysteresis
versus Temperature
5
4
3
2
1
00 0.4 0.95 1.2 1.8 2
VIN, INPUT VOLTAGE (VOLTS)
VO, OUTPUT VOLTAGE (VOLTS)
VCC = 5 V
TA = 25°C
2
1.6
1.2
0.8
0.4
0
4.5 4.75 5 5.25 5.5
VCC, POWER SUPPLY VOLTAGE (VOLTS)
VT, THRESHOLD VOLTAGE (VOLTS)
VT, HYSTERESIS (VOLTS)∆
1.9
1.7
1.5
1.3
1.1
0.9
0.7
-55°0°25°75°125°
TA, AMBIENT TEMPERATURE (°C)
VT, THRESHOLD VOLTAGE (VOLTS)
VT, HYSTERESIS (VOLTS)∆
TA = 25°C
VT+
VT-
∆VT
VT
VT-
VT+
PACKAGE DIMENSIONS
17
14 8
B
ADIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.715 0.770 18.16 18.80
B0.240 0.260 6.10 6.60
C0.145 0.185 3.69 4.69
D0.015 0.021 0.38 0.53
F0.040 0.070 1.02 1.78
G0.100 BSC 2.54 BSC
H0.052 0.095 1.32 2.41
J0.008 0.015 0.20 0.38
K0.115 0.135 2.92 3.43
L
M--- 10 --- 10
N0.015 0.039 0.38 1.01
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
F
HG DK
C
SEATING
PLANE
N
–T–
14 PL
M
0.13 (0.005)
L
M
J0.290 0.310 7.37 7.87
N SUFFIX
PLASTIC PACKAGE
CASE 646–06
ISSUE M
SN74LS14
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4
PACKAGE DIMENSIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
–A–
–B–
G
P7 PL
14 8
71 M
0.25 (0.010) B M
S
B
M
0.25 (0.010) A S
T
–T–
F
RX 45
SEATING
PLANE D14 PL K
C
J
M
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A8.55 8.75 0.337 0.344
B3.80 4.00 0.150 0.157
C1.35 1.75 0.054 0.068
D0.35 0.49 0.014 0.019
F0.40 1.25 0.016 0.049
G1.27 BSC 0.050 BSC
J0.19 0.25 0.008 0.009
K0.10 0.25 0.004 0.009
M0 7 0 7
P5.80 6.20 0.228 0.244
R0.25 0.50 0.010 0.019
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751A–03
ISSUE F
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SN74LS14/D
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