74Ls14

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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. Theyare capable of transforming slowly changing input signals into sharply defined, jitter-free output signals. Additionally, they have greater noise margin than conventional inverters. Each circuitcontains 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 inputtransitions, 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) isdetermined internally by resistor ratios and is essentially insensitive to temperature and supply voltage variations. LOGIC AND CONNECTION DIAGRAMS
VCC 14 13 SN54 / 74LS13 12 11 10 9 8

SN54/74LS13SN54/74LS14

SCHMITT TRIGGERS DUAL GATE/ HEX INVERTER
LOW POWER SCHOTTKY

J SUFFIX CERAMIC CASE 632-08
14 1

14 1

N SUFFIX PLASTIC CASE 646-06

1

2

3

4

5

6

7 GND
14 1D SUFFIX SOIC CASE 751A-02

VCC 14 13

SN54 / 74LS14 12 11 10 9 8

ORDERING INFORMATION
SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC

1

2

3

4

5

6

7 GND

GUARANTEEDOPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current — High Output Current — Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 – 55 0 Typ 5.0 5.025 25 Max 5.5 5.25 125 70 – 0.4 4.0 8.0 Unit V °C mA mA

FAST AND LS TTL DATA 5-24

SN54/74LS13 • SN54/74LS14
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)Limits Symbol VT+ VT– VT+ – VT– VIK VOH Parameter Positive-Going Threshold Voltage Negative-Going Threshold Voltage Hysteresis Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL IT+ IT–...
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