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
1
2
3
4
5
6
VCC
8
7
GND
LOGIC AND CONNECTION DIAGRAMS
SN54 / 74LS13
SN54 / 74LS14
14
13
12
11
10
9
1
2
3
4
5
6
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
TA
Operating Ambient Temperature Range
54
74
55
0
25
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
A, VIN = VIL
VOH
Output HIGH Voltage
74
2.7
3.4
V
VCC = MIN, IOH = 400
A, 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
A
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
ICC
Total, Output HIGH
Total, Output LOW
LS14
8.6
16
mA
VCC = 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
VCC = 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
0
0
0.4
0.95
1.2
1.8
2
VIN, INPUT VOLTAGE (VOLTS)
V
O
, OUTPUT
VOL
T
AGE (VOL
TS)
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)
V
T
,
THRESHOLD VOL
T
AGE (VOL
TS)
V
T
, HYSTERESIS (VOL
TS)
1.9
1.7
1.5
1.3
1.1
0.9
0.7
55
0
25
75
125
TA, AMBIENT TEMPERATURE (
C)
V
T
,
THRESHOLD VOL
T
AGE (VOL
TS)
V
T
, HYSTERESIS (VOL
TS)
TA = 25
C
VT+
VT
VT
VT+
VT
VT
5-26
FAST AND LS TTL DATA
SN54/74LS13
SN54/74LS14
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