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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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74HCT280D датащи(PDF) 2 Page - NXP Semiconductors |
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74HCT280D датащи(HTML) 2 Page - NXP Semiconductors |
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2 / 7 page  December 1990 2 Philips Semiconductors Product specification 9-bit odd/even parity generator/checker 74HC/HCT280 FEATURES • Word-length easily expanded by cascading • Similar pin configuration to the “180” for easy system up-grading • Generates either odd or even parity for nine data bits • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT280 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/HCT280 are 9-bit parity generators or checkers commonly used to detect errors in high-speed data transmission or data retrieval systems. Both even and odd parity outputs are available for generating or checking even or odd parity up to 9 bits. The even parity output ( ∑E) is HIGH when an even number of data inputs (I0 to I8) are HIGH. The odd parity output (∑0) is HIGH when an odd number of data inputs are HIGH. Expansion to larger word sizes is accomplished by tying the even outputs ( ∑E) of up to nine parallel devices to the data inputs of the final stage. For a single-chip 16-bit even/odd parity generator/checker, see PC74HC/HCT7080. APPLICATIONS • 25-line parity generator/checker • 81-line parity generator/checker 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 CL = 15 pF; VCC =5 V In to ∑E 17 18 ns In to ∑O 20 22 ns CI input capacitance 3.5 3.5 pF CPD power dissipationcapacitance per package notes 1 and 2 65 65 pF |
Аналогичный номер детали - 74HCT280D |
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Аналогичное описание - 74HCT280D |
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