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74HCT147N Arkusz danych(PDF) 2 Page - NXP Semiconductors |
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74HCT147N Arkusz danych(HTML) 2 Page - NXP Semiconductors |
2 / 7 page December 1990 2 Philips Semiconductors Product specification 10-to-4 line priority encoder 74HC/HCT147 FEATURES • Encodes 10-line decimal to 4-line BCD • Useful for 10-position switch encoding • Used in code converters and generators • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT147 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/HCT147 9-input priority encoders accept data from nine active LOW inputs (A0 to A8) and provide a binary representation on the four active LOW outputs (Y0 to Y3). A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line A8 having the highest priority. The devices provide the 10-line to 4-line priority encoding function by use of the implied decimal “zero”. The “zero” is encoded when all nine data inputs are HIGH, forcing all four outputs HIGH. 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 An to Yn CL = 15 pF; VCC = 5 V 15 17 ns CI input capacitance 3.5 3.5 pF CPD power dissipation capacitance per package notes 1 and 2 30 33 pF |
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