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74HCT4518 データシート(PDF) 2 Page - NXP Semiconductors |
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74HCT4518 データシート(HTML) 2 Page - NXP Semiconductors |
2 / 7 page December 1990 2 Philips Semiconductors Product specification Dual synchronous BCD counter 74HC/HCT4518 FEATURES • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT4518 are high-speed Si-gate CMOS devices and are pin compatible with the “4518” of the “4000B” series. They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT4518 are dual 4-bit internally synchronous BCD counters with an active HIGH clock input (nCP0) and an active LOW clock input (nCP1), buffered outputs from all four bit positions (nQ0 to nQ3) and an active HIGH overriding asynchronous master reset input (nMR). The counter advances on either the LOW-to-HIGH transition of nCP0 if nCP1 is HIGH or the HIGH-to-LOW transition of nCP1 if nCP0 is LOW. Either nCP0 or nCP1 may be used as the clock input to the counter and the other clock input may be used as a clock enable input. A HIGH on nMR resets the counter (nQ0 to nQ3 = LOW) independent of nCP0 and nCP1. APPLICATIONS • Multistage synchronous counting • Multistage asynchronous counting • Frequency dividers 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) 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 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 nCP0, nCP1 to nQn CL = 15 pF; VCC =5 V 20 24 ns tPHL propagation delay nMR to nQn 13 14 ns fmax maximum clock frequency 61 55 MHz CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per counter notes 1 and 2 29 27 pF |
同様の部品番号 - 74HCT4518 |
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同様の説明 - 74HCT4518 |
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