Description
14-pin plastic DIP 14-pin plastic SO COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F242N, N74F243N N74F242D, N74F243D PKG DWG # SOT27-1 SOT108-1 SF00765 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS An, Bn An, Bn OEA OEB An, Bn DESCRIPTION Data inputs (74F242) Data inputs (74F243) Output enable input (active Low) Output enable input Data outputs 74F (U.L.) HIGH/LOW 3.5/1.67 3.5/2.67 1.0/1.67 1.0/1.67 750/106.7 LOAD VALUE HIGH/LOW 70µA/1.0mA 70µA/1.6mA 20µA/1.0mA 20µA/1.0mA 15mA/64mA NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state. LOGIC SYMBOLS 74F242 3 4 5 6 3 4 5 6 74F243 A0 A1 A2 A3 A0 A1 A2 A3 1 13 OEA 1 OEB 13 B0 B1 B2 B3 B0 B1 B2 B3 OEA OEB VCC = Pin 14 GND = Pin 7 11 10 9 8 VCC = Pin 14 GND = Pin 7 11 10 9 8 SF00767 SF00768 1990 Aug 30 2 853-0356 00285 Philips Semiconductors Product specification Transceivers 74F242/74F243 LOGIC SYMBOLS (IEEE/IEC) 74F242 1 13 EN1 EN2 1 13 74F243 EN1 EN2 3 1 2 11 3 1 2 11 4 10 4 10 5 9 5 9 6 8 6 8 SF00769 SF00770 74F242 OEA 1 OEA 1 74F243 A0 3 11 B0 A0 3 11 B0 A1 4 10 B1 A1 4 10 B1 A2 5 9 B2 A2 5 9 B2 A3 6 8 B3 A3 6 8 B3 VCC = Pin 14 GND = Pin 7 OEB 13 SF00771 VCC = Pin 14 GND = Pin 7 OEB 13 SF00772 LOGIC DIAGRAMS FUNCTION TABLE, 74F242 INPUTS OEA L H L H OEB L L H H An INPUT Z a A=B OUTPUTS Bn B=A Z a INPUT FUNCTION TABLE, 74F243 INPUTS OEA L H L H OEB L L H H An INPUT Z a A=B OUTPUTS Bn B=A Z a INPUT H = High voltage level L = Low voltage level Z = High impedance “off” state a = This condition is not allowed due to excessive currents 1990 Aug 30 3 Philips Semiconductors Product specification Transceivers 74F242/74F243.
