SCHMITT TRIGGERS DUAL 4-INPUT
NAND/HEX INVERTERS
The MC54/74F13 and MC54/74F14 contain logic gates/inverters which ac-
cept standard TTL input signals and provide standard TTL output levels. They
are capable of transforming slowly changing input signals into sharply de-
fined, 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 thresh-
olds (typically 800 mV) is determined internally by resistor ratios and is essen-
tially insensitive to temperature and supply voltage variations.
LOGIC AND CONNECTION DIAGRAMS
14
MC54/74F13
MC54/74F14
SCHMITT TRIGGERS
DUAL 4-INPUT
NAND/HEX INVERTERS
FAST™ SCHOTTKY TTL
J SUFFIX
CERAMIC
CASE 632-08
1
MC54/74F13
VCC
14
D
13
C
12
N/C
11
B
10
A
9
O
8
14
1
N SUFFIX
PLASTIC
CASE 646-06
1
A
2
B
3
N/C
4
C
5
D
6
O
7
GND
14
1
D SUFFIX
SOIC
CASE 751A-02
MC54/74F14
VCC
14
A
13
O
12
A
11
O
10
A
9
O
8
ORDERING INFORMATION
MC54FXXJ
MC74FXXN
MC74FXXD
Ceramic
Plastic
SOIC
1
A
2
O
3
A
4
O
5
A
6
O
7
GND
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
Parameter
54, 74
54
74
IOH
IOL
Output Current — High
Output Current — Low
54, 74
54, 74
Min
4.5
–55
0
Typ
5.0
25
25
Max
5.5
125
70
–1.0
20
mA
mA
Unit
V
°C
FAST AND LS TTL DATA
4-14
MOTOROLA [ MOTOROLA, INC ]
