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74HC4538 Scheda tecnica(PDF) 8 Page - NXP Semiconductors |
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74HC4538 Scheda tecnica(HTML) 8 Page - NXP Semiconductors |
8 / 13 page September 1993 8 Philips Semiconductors Product specification Dual retriggerable precision monostable multivibrator 74HC/HCT4538 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard ICC category: MSI Note to HCT types The value of additional quiescent supply current ( ∆ICC) for a unit load of 1 is given in the family specifications. To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below. AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF INPUT UNIT LOAD COEFFICIENT nA0,nA1 nRD 0.50 0.65 SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HCT VCC (V) OTHER +25 −40 to +85 −40 to +125 min. typ. max. min. max. min. max. tPLH propagation delay nA0,nA1 to nQ 35 60 75 90 ns 4.5 Fig.8 tPHL propagation delay nA0,nA1 to nQ 35 60 75 90 ns 4.5 Fig.8 tPHL propagation delay nRD to nQ 35 60 75 90 ns 4.5 Fig.8 tPLH propagation delay nRD to nQ 35 60 75 90 ns 4.5 Fig.8 tTHL/ tTLH output transition time 7 15 19 21 ns 4.5 Fig.8 tW nA0 pulse width LOW 20 11 25 30 ns 4.5 Fig.8 tW nA1 pulse width HIGH 16 5 20 24 ns 4.5 Fig.8 tW nRD pulse width LOW 20 11 25 30 ns 4.5 Fig.8 tW nQ, nQ pulse width HIGH or LOW 0.63 0.70 0.77 0.602 0.798 0.595 0.805 ms 5.0 Fig.8; Rt = 10 kΩ; Ct = 0.1 µF trem removal time RD to nA0, nA1 7 2 9 11 ns 4.5 Fig.8 trt retrigger time nA0,nA1 − 80+X −− ns 4.5 Fig.8 X=CEXT / (4.5 × VCC) REXT external timing resistor 2 1000 k Ω 5.0 CEXT external timing capacitor no limits pF 5.0 |
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