MM74HCT245 Octal 3-STATE Transceiver February 1984 Revised May 2005 MM74HCT245 Octal 3-STATE Transceiver General Description Features The MM74HCT245 3-STATE bi-directional buffer utilizes TTL input compatible advanced silicon-gate CMOS technology and is intended 3-STATE outputs for connection to system busses for two-way asynchronous communication between data High output drive current: 6 mA (min) buses. It has high drive current outputs which enable high High speed: 16 ns typical propagation delay speed operation even when driving large bus capaci- tances. This circuit possesses the low power consumption Low power: 80 PA (74HCT Series) of CMOS circuitry, yet has speeds comparable to low power Schottky TTL circuits. This device is TTL input compatible and can drive up to 15 LS-TTL loads, and all inputs are protected from damage due to static discharge by diodes to V and ground. CC The MM74HCT245 has one active low enable input (G), and a direction control (DIR). When the DIR input is HIGH, data flows from the A inputs to the B outputs. When DIR is LOW, data flows from B to A. MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices. These parts are also plug-in replacements for LS-TTL devices and can be used to reduce power consumption in existing designs. Ordering Code: Order Number Package Number Package Description MM74HCT245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide MM74HCT245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MM74HCT245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide MM74HCT245N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code. Connection Diagram Truth Table Pin Assignments for DIP, SOIC, SOP and TSSOP Control Operation Inputs G DIR 245 L L B data to A bus L H A data to B bus H X isolation H HIGH Level L LOW Level X Irrelevant Top View 2005 Fairchild Semiconductor Corporation DS005366 www.fairchildsemi.comLogic Diagram www.fairchildsemi.com 2 MM74HCT245