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74HC4538 数据表(PDF) 2 Page - NXP Semiconductors |
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74HC4538 数据表(HTML) 2 Page - NXP Semiconductors |
2 / 13 page September 1993 2 Philips Semiconductors Product specification Dual retriggerable precision monostable multivibrator 74HC/HCT4538 FEATURES • Separate reset inputs • Triggering from leading or trailing edge • Output capability: standard • ICC category: MSI • Power-on reset on-chip GENERAL DESCRIPTION The 74HC/HCT4538 are high-speed Si-gate CMOS devices and are pin compatible with “4538” of the “4000B” series. They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT4538 are dual retriggerable-resettable monostable multivibrators. Each multivibrator has an active LOW trigger/retrigger input (nA0), an active HIGH trigger/retrigger input (nA1) , an overriding active LOW direct reset input (nRD), an output (nQ) and its complement (nQ), and two pins (nCTC and nRCTC) for connecting the external timing components Ct and Rt. Typical pulse width variation over temperature range is ± 0.2%. The “4538” may be triggered by either the positive or the negative edges of the input pulse. The duration and accuracy of the output pulse are determined by the external timing components Ct and Rt. The output pulse width (T) is equal to 0.7 × Rt × Ct. The linear design techniques guarantee precise control of the output pulse width. A LOW level at nRD terminates the output pulse immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD = CPD × VCC2 × fi +∑ (CL × VCC2 × fo) + + 0.48 × CEXT × VCC2 × fo + D × 0.8 × VCC where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V D = duty factor in % CEXT = timing capacitance in pF 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC − 1.5 V ORDERING INFORMATION See “74HC/HCT/HCU/HCMOS Logic Package Information”. SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/ tPLH propagation delay nA0,nA1 to nQ, nQCL = 15 pF; VCC = 5 V 27 30 ns CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per multivibrator notes 1 and 2 136 138 pF |
类似零件编号 - 74HC4538 |
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类似说明 - 74HC4538 |
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