5-1
FAST AND LS TTL DAT A
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
V
CC
8
7
GND
LOGIC AND CONNECTION DIAGRAMS
SN54/74LS13
SN54/74LS14
14 13 12 11 10 9
123456
V
CC
8
7
GND
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range 54
74
–55
0
25
25
125
70
°C
I
OH
Output Current — High 54, 74 –0.4 mA
I
OL
Output Current — Low 54
74
4.0
8.0
mA
SN54/74LS13
SN54/74LS14
SCHMITT TRIGGERS
DUAL GA TE/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
5-2
FAST AND LS TTL DATA
SN54/74LS13 • SN54/74LS14
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
V
T+
Positive-Going Threshold Voltage 1.5 2.0 V VCC = 5.0 V
V
T–
Negative-Going Threshold Voltage 0.6 1.1 V VCC = 5.0 V
VT+–V
T–
Hysteresis 0.4 0.8 V VCC = 5.0 V
V
IK
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
54 2.5 3.4 V
VOHOutput HIGH Volt
age
74 2.7 3.4 V
V
CC
=
MIN, I
OH
= –
400 µA, V
IN
=
V
IL
54, 74 0.25 0.4 V VCC = MIN, IOL = 4.0 mA, VIN = 2.0 V
VOLOutput LOW Volt
age
74 0.35 0.5 V VCC = MIN, IOL = 8.0 mA, VIN = 2.0 V
I
T+
Input Current at Positive-Going Threshold –0.14 mA VCC = 5.0 V , VIN = V
T+
I
T–
Input Current at Negative-Going Threshold –0.18 mA VCC = 5.0 V , VIN = V
T–
1.0 20 µA VCC = MAX, VIN = 2.7 V
IIHI
nput
HIGH C
urren
t
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
I
OS
Short Circuit Current (Note 1) –20 –100 mA VCC = MAX, V
OUT
= 0 V
Power Supply Current
LS13 2.9 6.0
I
CC
Total, Output HIGH
LS14 8.6 16
mA VCC = MAX
CC
LS13 4.1 7.0
CC
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 (T
A
= 25°C)
Max
Symbol Parameter
LS13 LS14
Unit Test Conditions
t
PLH
Propagation Delay , Input to Output 22 22 ns
VCC = 5.0 V
t
PHL
Propagation Delay , Input to Output 27 22 ns
CC
CL = 15 pF
Figure 1. AC Waveforms
3 V
0 V
V
IN
V
OUT
1.6 V
0.8 V
t
PHL
1.3 V
1.3 V
t
PLH
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