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74HCT160PW Arkusz danych(PDF) 2 Page - NXP Semiconductors |
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74HCT160PW Arkusz danych(HTML) 2 Page - NXP Semiconductors |
2 / 9 page December 1990 2 Philips Semiconductors Product specification Presettable synchronous BCD decade counter; asynchronous reset 74HC/HCT160 FEATURES • Synchronous counting and loading • Two count enable inputs for n-bit cascading • Positive-edge triggered clock • Asynchronous reset • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT160 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT160 are synchronous presettable decade counters which feature an internal look-ahead carry and can be used for high-speed counting. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset to a HIGH or LOW level. A LOW level at the parallel enable input (PE) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock (providing that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW level at the master reset input (MR) sets all four outputs of the flip-flops (Q0 to Q3) to LOW level regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function). The look-ahead carry simplifies serial cascading of the counters. Both count enable inputs (CEP and CET) must be HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH level output of Q0. This pulse can be used to enable the next cascaded stage. The maximum clock frequency for the cascaded counters is determined by the CP to TC propagation delay and CEP to CP set-up time, according to the following formula: fmax = 1 t P max () CP to TC () +t SU (CEP to CP) --------------------------------------------------------------------------------------------------------- QUICK REFERENCE DATA GND = 0 V; Tamb=25 °C; tr =tf = 6 ns SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL propagation delay CP to Qn CP to TC MR to Qn MR to TC CET to TC CL =15pF; VCC =5V 19 21 21 21 14 21 24 23 26 14 ns ns ns ns ns tPLH propagation delay CP to Qn CP to TC CET to TC 19 21 14 21 20 7 ns ns ns fmax maximum clock frequency 61 31 MHz CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per package notes 1 and 2 39 34 pF 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 |
Podobny numer części - 74HCT160PW |
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Podobny opis - 74HCT160PW |
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