HEF4534B

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 HEF4534B LSI Real time 5-decade counter Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification Real time 5-decade counter DESCRIPTION The HEF4534B is a 5-decade ripple counter. The binary outputs of the decade counters are time-multiplexed by an internal scanner on four BCD outputs (O0 to O3). The selected decade is indicated by a logic HIGH on the appropriate digit select output (OS0: units, 1; OS1: tens, 10; OS2: hundreds, 102; OS3: thousands, 103; OS4: ten thousands, 104). The binary outputs (O0 to O3) and the select outputs (OS0 to OS4) are 3-state controlled via enable inputs EO and EOS respectively, allowing interface with other bus orientated devices. Cascading may be accomplished by using the carry out (TC). The counter is triggered by a LOW to HIGH transition on the decade clock (CPA) and is reset by a HIGH level on the master reset (MR). The HEF4534B LSI scanner is triggered by a LOW to HIGH transition on the scanner clock (CPS) and is reset (select ten thousand counter) by a HIGH level on the scanner reset (MRsc). The counter can operate in four modes depending on the state of the mode select inputs (SA, SB). The error detector will detect an error when a positive edge on CPA is not accompan...