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74ABT833DB Datasheet(PDF) 3 Page - NXP Semiconductors |
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74ABT833DB Datasheet(HTML) 3 Page - NXP Semiconductors |
3 / 11 page Philips Semiconductors Product specification 74ABT833 Octal transceiver with parity generator/checker (3-State) 1993 Jun 21 3 LOGIC SYMBOL OEB OEA CLEAR 14 1 11 15 10 PARITY ERROR CP 13 23 45 67 89 A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 23 22 21 20 19 18 17 16 SA00213 FUNCTION TABLE INPUTS OUTPUTS MODE OEB OEA An Σ of Highs Bn + Parity Σ of Highs An Bn PARITY A data to B bus and generate odd parity output L H Odd Even (output) (input) An L H B data to A bus and check for parity error1 H L (output) X Bn (input) (input) A bus and B bus disabled2 H H X X Z Z Z A data to B bus and generate inverted parity output L L Odd Even (output) (input) An H L NOTES: 1. Error checking is detailed in the Error Flag Function Table below. 2. When clocked, the error output is Low if the sum of A inputs is even or High if the sum of A inputs is odd. ERROR FLAG FUNCTION TABLE INPUTS Internal node Output MODE CLEAR CP Bn + Parity Σ of Highs Point ”P” Pre–state ERRORn–1 ERROR OUTPUT Sample H H H ↑ ↑ X Odd Even X H L X H X L H L L Hold H ↑ X X X NC Clear L X X X X H H = High voltage level steady state L = Low voltage level steady state X = Don’t care NC = No change Z = High impedance ”off” state ↑ = Low-to-High clock transition ↑ = Not a Low-to-High clock transition |
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