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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 HEF4520B MSI Dual binary counter Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification Dual binary counter DESCRIPTION The HEF4520B is a dual 4-bit internally synchronous binary counter. The counter has an active HIGH clock input (CP0) and an active LOW clock input (CP1), buffered outputs from all four bit positions (O0 to O3) and an active HIGH overriding asynchronous master reset input (MR). The counter advances on either the LOW to HIGH transition of the CP0 input if CP1 is HIGH or the HIGH to HEF4520B MSI LOW transition of the CP1 input if CP0 is low. Either CP0 or CP1 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 MR resets the counter (O0 to O3 = LOW) independent of CP0, CP1. Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times. Fig.2 Pinning diagram. HEF4520BP(N): HEF4520BD(F): HEF4520BT(D): 16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1) (SOT109-1) Fig.1 Functional diagram. ( ): Package Designator North America PINNING CP0A, CP0B CP1A, CP1B MRA, MRB O0A to O3A O0B to O3B clock inputs (L to H triggered) clock inputs (H to L triggered) master reset inputs outputs outputs FAMILY DATA, IDD LIMITS category MSI See Family Specifications January 1995 2 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... January 1995 Fig.3 Logic diagram (one counter). FUNCTION TABLE 3 CP0 L X X L H X Notes 1. H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial = positive-going transition = negative-going transition Product specification X CP1 H MR L L L L L L H MODE counter advances counter advances no change no change no change no change O0 to O3 = LOW Philips Semiconductors Dual binary counter HEF4520B MSI Philips Semiconductors Product specification Dual binary counter AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns VDD V Propagation delays CP0 , CP1 On HIGH to LOW 5 10 15 5 LOW to HIGH MR On HIGH to LOW Output transition times HIGH to LOW 5 10 15 5 LOW to HIGH Minimum CP0 pulse width; LOW Minimum CP1 pulse width; HIGH Minimum MR pulse width; HIGH Recovery time for MR Set-up times CP0 CP1 10 15 5 10 15 5 10