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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 HEF4557B LSI 1-to-64 bit variable length shift register Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification 1-to-64 bit variable length shift register DESCRIPTION The HEF4557B is a static clocked serial shift register whose length may be programmed to be any number of bits between 1 and 64. The number of bits selected is equal to the sum of the subscripts of the enabled length control inputs (L1, L2, L4, L8, L16 and L32) plus one. Serial data may be selected from the DA or DB data inputs with the A/B select input. This feature is useful for recirculation HEF4557B LSI purposes. Information on DA or DB is shifted into the first register position and all the data in the register is shifted one position to the right on the LOW to HIGH transition of CP0 while CP1 is LOW or on the HIGH to LOW transition of CP1 while CP0 is HIGH. A HIGH on master reset (MR) resets the register and forces O to LOW and O to HIGH, independent of the other inputs. Fig.1 Functional diagram. PINNING DA, DB A/B CP0 CP1 MR L1 to L32 O, O data inputs select data input clock input clock enable input asynchronous master reset bit-length control inputs buffered outputs HEF4557BT(D): HEF4557BD(F): HEF4557BP(N): 16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1) ( ): Package Designator North America FAMILY DATA, IDD LIMITS category LSI See Family Specifications Fig.2 Pinning diagram. 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 3 Fig.3 Logic diagram. Philips Semiconductors 1-to-64 bit variable length shift register HEF4557B LSI Product specification Philips Semiconductors Product specification 1-to-64 bit variable length shift register FUNCTION TABLE INPUTS MR L L L L H A/B L H L H X DA D1 D1 D1 D1 X DB D2 D2 D2 D2 X H H X X CPO CP1 L L OUTPUT O (1) D2 D1 D2 D1 L Notes HEF4557B LSI 1. The moment Dn appears at O depends on the bit-length shown in the table below. 2. H = HIGH state (the more positive voltage) 3. L = LOW state (the less positive voltage) 4. X = state is immaterial 5. 6. = positive-going transition = negative-going transition 7. Dn = either HIGH or LOW BIT-LENGTH SELECT FUNCTION TABLE L32 L L L L L L L L L H H H H H H L16 L L L L L L L L H L L H H H H L8 L L L L L L L L H L L H H H H L4 L L L L H H H