74LS13资料
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5-24FAST AND LS TTL DATASCHMITT TRIGGERSDUAL GATE/HEX INVERTERThe SN54LS/74LS13 and SN54LS/74LS14 contain logic gates/inverterswhich accept standard TTL input signals and provide standard TTL outputlevels. They are capable of transforming slowly changing input signals intosharply defined, jitter-free output signals. Additionally, they have greater noisemargin than conventional inverters.Each circuit contains a Schmitt trigger followed by a Darlington level shifterand a phase splitter driving a TTL totem pole output. The Schmitt trigger usespositive feedback to effectively speed-up slow input transitions, and providedifferent input threshold voltages for positive and negative-going transitions.This hysteresis between the positive-going and negative-going inputthresholds (typically 800 mV) is determined internally by resistor ratios and isessentially insensitive to temperature and supply voltage variations.14131211109
123456VCC8
7GNDLOGIC AND CONNECTION DIAGRAMSSN54/74LS13
SN54/74LS1414131211109
123456VCC8
7GNDGUARANTEED OPERATING RANGES
SymbolParameterMinTypMaxUnitVCCSupply Voltage54744.54.755.05.05.55.25VTAOperating Ambient Temperature Range5474–550252512570°CIOHOutput Current — High54, 74–0.4mAIOLOutput Current — Low54744.08.0mA元器件交易网www.cecb2b.com
5-25FAST AND LS TTL DATASN54/74LS13 •SN54/74LS14DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)LimitsSymbolParameterMinTypMaxUnitTest ConditionsVT+Positive-Going Threshold Voltage1.52.0VVCC = 5.0 VVT–Negative-Going Threshold Voltage0.61.1VVCC = 5.0 VVT+–VT–Hysteresis0.40.8VVCC = 5.0 VVIKInput Clamp Diode Voltage–0.65–1.5VVCC = MIN, IIN = –18 mA542.53.4VVOHOutput HIGH Voltage742.73.4VVCC = MIN, IOH = –400 µA, VIN = VILV54,740.250.4VVCC = MIN, IOL = 4.0 mA, VIN = 2.0 VOLOutput LOW Voltage740.350.5VVCC = MIN, IOL = 8.0 mA, VIN = 2.0 VIT+Input Current at Positive-Going Threshold–0.14mAVCC = 5.0 V, VIN = VT+IT–Input Current at Negative-Going Threshold–0.18mAVCC = 5.0 V, VIN = VT–I1.020µAVCC = MAX, VIN = 2.7 VIHInput HIGH Current0.1mAVCC = MAX, VIN = 7.0 VIILInput LOW Current–0.4mAVCC = MAX, VIN = 0.4 VIOSShort Circuit Current (Note 1)–20–100mAVCC = MAX, VOUT = 0 VPower Supply CurrentLS132.96.0ICCTotal, Output HIGHLS148.616VLS134.17.0mACC = MAXTotal, Output LOWLS141221Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.AC CHARACTERISTICS (TA = 25°C)MaxSymbolParameterLS13LS14UnitTest ConditionstPLHPropagation Delay, Input to Output2222nsVtPHLPropagation Delay, Input to Output2722nsCC = 5.0 VCL = 15 pF
Figure 1. AC Waveforms3 V0 VVIN
VOUT1.6 V0.8 VtPHL1.3 V1.3 VtPLH元器件交易网www.cecb2b.com
Figure 2. VIN versus VOUT Transfer Function
Figure 3. Threshold Voltage and Hysteresisversus Power Supply Voltage
Figure 4. Threshold Voltage Hysteresisversus Temperature54321000.40.951.21.82VIN, INPUT VOLTAGE (VOLTS)VO, OUTPUT VOLTAGE (VOLTS)VCC = 5 VTA = 25°C
21.61.20.80.404.54.7555.255.5VCC, POWER SUPPLY VOLTAGE (VOLTS)VT, THRESHOLD VOLTAGE (VOLTS)
VT, HYSTERESIS (VOLTS)
∆
1.91.71.51.31.10.90.7–55°0°25°75°125°TA, AMBIENT TEMPERATURE (°C)VT, THRESHOLD VOLTAGE (VOLTS)
VT, HYSTERESIS (VOLTS)
∆TA = 25°CVT+
VT–∆VT
VT+
VT–∆VT
5-26FAST AND LS TTL DATASN54/74LS13 •SN54/74LS14元器件交易网www.cecb2b.com
