5-24
FAST AND LS TTL DATA
SCHMITT TRIGGERS
DUAL GATE/HEX INVERTER
The SN54LS/74LS13 and SN54LS/74LS14 contain 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.
14 13 12 11 10 9
123456
VCC
8
7
GND
LOGIC AND CONNECTION DIAGRAMS
SN54/74LS13
SN54/74LS14
14 13 12 11 10 9
123456
VCC
8
7
GND
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 4.0
8.0 mA
SN54/74LS13
SN54/74LS14
SCHMITT TRIGGERS
DUAL GATE/HEX INVERTER
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14 1
14
1
ORDERING INFORMATION
SN54LSXXJ Ceramic
SN74LSXXN Plastic
SN74LSXXD SOIC
14 1
D SUFFIX
SOIC
CASE 751A-02
5-25
FAST AND LS TTL DATA
SN54/74LS13 • SN54/74LS14
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
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
54 2.5 3.4 V
VCC = MIN, IOH = –400 µA, VIN = VIL
VOH
Output HIGH Voltage
74 2.7 3.4 V
VCC = MIN, IOH = –400 µA, VIN = VIL
VOL
Output LOW Voltage
54, 74 0.25 0.4 V VCC = MIN, IOL = 4.0 mA, VIN = 2.0 V
VOL
Output LOW Voltage
74 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
Input 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
Total, Output LOW
LS13 2.9 6.0
mA
VCC = MAX
I
CC
Total, Output HIGH
Total, Output LOW
LS14 8.6 16
mA V
CC = MAX
ICC
Total, Output LOW
LS13 4.1 7.0
mA
VCC = MAX
Total, Output LOW
LS14 12 21
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
Symbol
Parameter
LS13 LS14
Unit
Test Conditions
tPLH Propagation Delay, Input to Output 22 22 ns
V
CC = 5.0 V
CL = 15 pF
tPHL Propagation Delay, Input to Output 27 22 ns
VCC = 5.0 V
CL = 15 pF
Figure 1. AC Waveforms
3 V
0 V
VIN
VOUT
1.6 V 0.8 V
tPHL
1.3 V 1.3 V
tPLH
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
5-26
FAST AND LS TTL DATA
SN54/74LS13 • SN54/74LS14
