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54LS257 Fiches technique(PDF) 4 Page - Motorola, Inc |
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54LS257 Fiches technique(HTML) 4 Page - Motorola, Inc |
4 / 6 page 5-430 FAST AND LS TTL DATA SN54/74LS257B D SN54/74LS258B DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Symbol Parameter Limits Unit Test Conditions Symbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 54 0.7 V Guaranteed Input LOW Voltage for All Inputs VIL Input LOW Voltage 74 0.8 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage – 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA VOH Output HIGH Voltage 54 2.4 3.4 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VOH Output HIGH Voltage 74 2.4 3.1 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VOL Output LOW Voltage 54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VOL Output LOW Voltage 74 0.35 0.5 V IOL = 24 mA VIN = VIL or VIH per Truth Table IOZH Output Off Current — HIGH 20 µA VCC = MAX, VOUT = 2.7 V IOZL Output Off Current — LOW – 20 µA VCC = MAX, VOUT = 0.4 V IIH Input HIGH Current Other Inputs S Inputs 20 40 µA VCC = MAX, VIN = 2.7 V IIH Other Inputs S Inputs 0.1 0.2 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current All Inputs – 0.4 mA VCC = MAX, VIN = 0.4 V IOS Short Circuit Current (Note 1) – 30 – 130 mA VCC = MAX ICC Power Supply Current Total, Output HIGH LS257B LS258B 10 9.0 mA VCC = MAX ICC Total, Output LOW LS257B LS258B 16 14 mA VCC = MAX Total, Output 3-State LS257B LS258B 19 16 mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) See SN54LS251 for Waveforms Symbol Parameter Limits Unit Test Conditions Symbol Parameter Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay, Data to Output 10 12 13 15 ns Figures 1 & 2 CL = 45 pF tPLH tPHL Propagation Delay, Select to Output 14 14 21 21 ns Figures 1 & 2 CL = 45 pF tPZH Output Enable Time to HIGH Level 20 25 ns Figures 4 & 5 CL = 45 pF RL = 667 Ω tPZL Output Enable Time to LOW Level 20 25 ns Figures 3 & 5 CL = 45 pF RL = 667 Ω tPLZ Output Disable Time to LOW Level 16 25 ns Figures 3 & 5 CL = 5.0 pF RL = 667 Ω tPHZ Output Disable Time from HIGH Level 18 25 ns Figures 4 & 5 CL = 5.0 pF RL = 667 Ω |
Numéro de pièce similaire - 54LS257 |
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Description similaire - 54LS257 |
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