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GATE/HEX INVERTER. SN54LS13 Datasheet |
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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.
LOGIC AND CONNECTION DIAGRAMS
VCC
14 13
SN54 / 74LS13
12 11 10
9
8
12
VCC
14 13
345
SN54 / 74LS14
12 11 10
67
GND
98
SN54/74LS13
SN54/74LS14
SCHMITT TRIGGERS
DUAL GATE/ HEX INVERTER
LOW POWER SCHOTTKY
14
1
J SUFFIX
CERAMIC
CASE 632-08
14
1
N SUFFIX
PLASTIC
CASE 646-06
14
1
D SUFFIX
SOIC
CASE 751A-02
ORDERING INFORMATION
SN54LSXXJ
SN74LSXXN
SN74LSXXD
Ceramic
Plastic
SOIC
1234567
GND
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 0.4
mA
54 4.0 mA
74 8.0
FAST AND LS TTL DATA
5-24
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SN54/74LS13 • SN54/74LS14
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VT+
VT–
VT+ – VT–
VIK
Positive-Going Threshold Voltage
Negative-Going Threshold Voltage
Hysteresis
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
1.5 2.0 V VCC = 5.0 V
0.6 1.1 V VCC = 5.0 V
0.4 0.8
V VCC = 5.0 V
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
54 2.5 3.4
74 2.7 3.4
V
V VCC = MIN, IOH = – 400 µA, VIN = VIL
VOL
IT+
IT–
IIH
IIL
IOS
ICC
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V VCC = MIN, IOL = 4.0 mA, VIN = 2.0 V
V VCC = MIN, IOL = 8.0 mA, VIN = 2.0 V
Input Current at Positive-Going Threshold
– 0.14
mA VCC = 5.0 V, VIN = VT+
Input Current at Negative-Going Threshold
– 0.18
mA VCC = 5.0 V, VIN = VT–
Input HIGH Current
1.0 20
µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
Input LOW Current
– 0.4 mA VCC = MAX, VIN = 0.4 V
Short Circuit Current (Note 1)
– 20 –100 mA VCC = MAX, VOUT = 0 V
Power Supply Current
Total, Output HIGH
Total, Output LOW
LS13
LS14
LS13
LS14
2.9 6.0
8.6 16 mA VCC = MAX
4.1 7.0
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
tPLH
tPHL
Parameter
Propagation Delay, Input to Output
Propagation Delay, Input to Output
Max
LS13
LS14
22 22
27 22
Unit
ns
ns
Test Conditions
VCC = 5.0 V
CL = 15 pF
3V
VIN
0V
VOUT
1.6 V
tPHL
1.3 V
0.8 V
tPLH
1.3 V
Figure 1. AC Waveforms
FAST AND LS TTL DATA
5-25
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SN54/74LS13 • SN54/74LS14
5
VCC = 5 V
TA = 25°C
4
3
2
1
0
0 0.4
0.95 1.2
1.8 2
VIN, INPUT VOLTAGE (VOLTS)
Figure 2. VIN versus VOUT Transfer Function
2 TA = 25°C
1.6 VT+
1.2
VT–
0.8 ∆ VT
0.4
0
4.5 4.75 5
5.25 5.5
VCC, POWER SUPPLY VOLTAGE (VOLTS)
Figure 3. Threshold Voltage and Hysteresis
versus Power Supply Voltage
1.9
1.7 VT+
1.5
1.3
1.1
0.9
0.7
– 55°
VT–
∆ VT
0° 25°
75°
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Threshold Voltage Hysteresis
versus Temperature
125°
FAST AND LS TTL DATA
5-26
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