SN54/74LS13 SN54/74LS14 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. SCHMITT TRIGGERS DUAL GATE/ HEX INVERTER LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 632-08 14 LOGIC AND CONNECTION DIAGRAMS SN54 / 74LS13 VCC 14 1 13 12 11 10 9 8 N SUFFIX PLASTIC CASE 646-06 14 1 1 2 3 4 5 6 7 14 GND 1 SN54 / 74LS14 VCC 14 13 12 11 10 9 ORDERING INFORMATION 8 SN54LSXXJ SN74LSXXN SN74LSXXD 1 D SUFFIX SOIC CASE 751A-02 2 3 4 5 6 Ceramic Plastic SOIC 7 GND GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA FAST AND LS TTL DATA 5-24 SN54/74LS13 • SN54/74LS14 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter Typ Max Unit 2.0 V VCC = 5.0 V 1.1 V VCC = 5.0 V V VCC = 5.0 V V VCC = MIN, IIN = – 18 mA Test Conditions VT+ Positive-Going Threshold Voltage 1.5 VT– Negative-Going Threshold Voltage 0.6 VT+ – VT– Hysteresis 0.4 VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IT+ Input Current at Positive-Going Threshold – 0.14 mA VCC = 5.0 V, VIN = VT+ IT– Input Current at Negative-Going Threshold – 0.18 mA VCC = 5.0 V, VIN = VT– 20 IIH Input HIGH Current µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current – 0.4 mA VCC = MAX, VIN = 0.4 V IOS Short Circuit Current (Note 1) –100 mA VCC = MAX, VOUT = 0 V mA VCC = MAX 0.8 – 0.65 – 1.5 54 2.5 3.4 V 74 2.7 3.4 V 54, 74 74 0.25 0.4 0.35 0.5 1.0 – 20 VCC = MIN, IOH = – 400 µA, VIN = VIL V VCC = MIN, IOL = 4.0 mA, VIN = 2.0 V V VCC = MIN, IOL = 8.0 mA, VIN = 2.0 V Power Supply Current Total, Output HIGH ICC Total, Output LOW LS13 2.9 6.0 LS14 8.6 16 LS13 4.1 7.0 LS14 12 21 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C) Max Symbol Parameter LS13 LS14 Unit Test Conditions VCC = 5.0 V CL = 15 pF tPLH Propagation Delay, Input to Output 22 22 ns tPHL Propagation Delay, Input to Output 27 22 ns 3V 1.6 V VIN 0.8 V 0V tPHL VOUT tPLH 1.3 V Figure 1. AC Waveforms FAST AND LS TTL DATA 5-25 1.3 V SN54/74LS13 • SN54/74LS14 V O , OUTPUT VOLTAGE (VOLTS) 5 VCC = 5 V TA = 25°C 4 3 2 1 0 0 0.4 0.95 1.2 VIN, INPUT VOLTAGE (VOLTS) 1.8 2 Figure 2. VIN versus VOUT Transfer Function V T , THRESHOLD VOLTAGE (VOLTS) ∆ V T, HYSTERESIS (VOLTS) 2 1.6 TA = 25°C VT+ 1.2 VT– 0.8 ∆ VT 0.4 0 4.5 4.75 5 5.25 VCC, POWER SUPPLY VOLTAGE (VOLTS) 5.5 Figure 3. Threshold Voltage and Hysteresis versus Power Supply Voltage V T , THRESHOLD VOLTAGE (VOLTS) ∆ V T, HYSTERESIS (VOLTS) 1.9 1.7 VT+ 1.5 1.3 1.1 0.9 0.7 – 55° VT– ∆ VT 0° 25° 75° TA, AMBIENT TEMPERATURE (°C) Figure 4. Threshold Voltage Hysteresis versus Temperature FAST AND LS TTL DATA 5-26 125°