INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC • The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4555B MSI Dual 1-of-4 decoder/demultiplexer Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification HEF4555B MSI Dual 1-of-4 decoder/demultiplexer DESCRIPTION The HEF4555B is a dual 1-of-4 decoder/demultiplexer. Each has two address inputs (A0 and A1), an active LOW enable input (E) and four mutually exclusive outputs which are active HIGH (O0 to O3). When used as a decoder, E when HIGH, forces O0 to O3 LOW. When used as a demultiplexer, the appropriate output is selected by the information on A0 and A1 with E as data input. All unselected outputs are LOW. Fig.2 Pinning diagram. HEF4555BP(N): 16-lead DIL; plastic (SOT38-1) HEF4555BD(F): 16-lead DIL; ceramic (cerdip) (SOT74) HEF4555BT(D): 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America PINNING E enable inputs (active LOW) A0 and A1 address inputs O0 to O3 outputs (active HIGH) FAMILY DATA, IDD LIMITS category MSI See Family Specifications Fig.1 Functional diagram. January 1995 2 Philips Semiconductors Product specification HEF4555B MSI Dual 1-of-4 decoder/demultiplexer Fig.3 Logic diagram (one decoder/multiplexer). TRUTH TABLE INPUTS OUTPUTS E A0 A1 O0 O1 O2 O3 L L L H L L L L H L L H L L L L H L L H L L H H L L L H H X X L L L L Notes 1. H = HIGH state (the more positive voltage) 2. L = LOW state (the less positive voltage) 3. X = state is immaterial January 1995 3 Philips Semiconductors Product specification HEF4555B MSI Dual 1-of-4 decoder/demultiplexer AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V SYMBOL MIN. TYP. TYPICAL EXTRAPOLATION FORMULA MAX. Propagation delays An → On 5 HIGH to LOW 10 tPHL 15 5 LOW to HIGH 10 tPLH 15 En → On 5 HIGH to LOW 10 tPHL 15 5 LOW to HIGH 10 tPLH 15 Output transition times 5 HIGH to LOW 88 ns + (0,55 ns/pF) CL 90 ns 34 ns + (0,23 ns/pF) CL 30 65 ns 22 ns + (0,16 ns/pF) CL 140 280 ns 113 ns + (0,55 ns/pF) CL 55 105 ns 44 ns + (0,23 ns/pF) CL 40 75 ns 32 ns + (0,16 ns/pF) CL 125 250 ns 98 ns + (0,55 ns/pF) CL 50 95 ns 39 ns + (0,23 ns/pF) CL 30 65 ns 22 ns + (0,16 ns/pF) CL 150 295 ns 123 ns + (0,55 ns/pF) CL 55 110 ns 44 ns + (0,23 ns/pF) CL 40 75 ns 32 ns + (0,16 ns/pF) CL 10 ns + ((1,0 ns/pF) CL 60 120 ns 60 ns 9 ns + (0,42 ns/pF) CL 15 20 40 ns 6 ns + (0,28 ns/pF) CL 5 60 120 ns 10 ns + (1,0 ns/pF) CL 30 60 ns 9 ns + (0,42 ns/pF) CL 20 40 ns 6 ns + (0,28 ns/pF) CL 10 tTHL tTLH 15 VDD V Dynamic power 230 ns 45 30 10 LOW to HIGH 115 5 TYPICAL FORMULA FOR P (µW) 4500 fi + ∑ (foCL) × VDD2 dissipation per 10 18 800 fi + ∑ (foCL) × package (P) 15 45 700 fi + ∑ (foCL) × VDD2 VDD2 where fi = input freq. (MHz) fo = output freq. (MHz) CL = load capacitance (pF) ∑ (foCL) = sum of outputs VDD = supply voltage (V) APPLICATION INFORMATION Some examples of applications for the HEF4555B are: • Code conversion. • Address decoding. • Demultiplexing: when using the enable input as data input. January 1995 4