MC74HC242

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Quad 3-State Bus Transceiver High–Performance Silicon–Gate CMOS The MC74HC242 is identical in pinout to the LS242. The device inputs are compatible with Standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. This quad bus transceiver is designed for asynchronous two–way communications between data buses. The states of the Output Enables (A–to–B Enable and B–to–A Enable) determine both the direction of data flow (from A to B or from B to A) and the modes of the Data Ports (input, output, or high–impedance). 14 MC74HC242 N SUFFIX PLASTIC PACKAGE CASE 646–06 1 ORDERING INFORMATION MC74HCXXXN Plastic Output Drive Capability: 15 LSTTL Loads Outputs Directly Interface to CMOS, NMOS and TTL Operating Voltage Range: 2 to 6V Low Input Current: 1µA High Noise Immunity Characteristic of CMOS Devices In Compliance With the JEDEC Standard No. 7A Requirements Chip Complexity: 130 FETs or 32.5 Equivalent Gates LOGIC DIAGRAM Control Inputs A–to–B Enable H L H L B–to–A Enable H H L L Data Port Status A O Z Z I B I Z Z O FUNCTION TABLE A1 A2 A3 A4 3 4 5 6 11 10 9 8 I = Input; O = Output, O = Inverting Output Z = High Impedance B1 B2 B3 B4 A Data Port B Data Port Output EnableS A–TO–B ENABLE B–TO–A ENABLE 1 13 Pin 14 = VCC Pin 7 = GND Pins 2, 12 = No Connection Pinout: 14–Lead Plastic Package (Top View) B–to–A VCC Enable NC 14 13 12 B1 11 B2 10 B3 9 B4 8 1 2 3 A1 4 A2 5 A3 6 A4 7 GND A–t...