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鈩?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 鈥?High
Output Current 鈥?Low
54, 74
54, 74
Min
4.5
鈥?5
0
Typ
5.0
25
25
Max
5.5
125
70
鈥?.0
20
mA
mA
Unit
V
擄C
FAST AND LS TTL DATA
4-14
1
2
3
