SN54/74LS132
QUAD 2-INPUT
SCHMITT TRIGGER NAND GATE
The SN54 / 74LS132 contains four 2-Input NAND Gates which accept standard TTL input signals and provide standard TTL output levels. They are capable of transforming slowly changing input signals into sharply defined, jitterfree output signals. Additionally, they have greater noise margin than
conventional NAND Gates.
Each circuit contains a 2-input 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. As long
as one input remains at a more positive voltage than VT+ (MAX), the gate will
respond to the transitions of the other input as shown in Figure 1.
QUAD 2-INPUT
SCHMITT TRIGGER NAND GATE
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 632-08
14
1
LOGIC AND CONNECTION DIAGRAM
DIP (TOP VIEW)
N SUFFIX
PLASTIC
CASE 646-06
VCC
14
13
12
11
10
9
8
14
1
14
2
3
4
5
6
1
7
GND
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
5
V O , OUTPUT VOLTAGE (VOLTS)
1
D SUFFIX
SOIC
CASE 751A-02
VCC = 5 V
TA = 25°C
4
3
2
1
0
0
0.4
0.95
1.2
VIN, INPUT VOLTAGE (VOLTS)
1.8
Figure 1. VIN versus VOUT Transfer Function
FAST AND LS TTL DATA
5-1
2
Ceramic
Plastic
SOIC
