DESCRIPTION/ORDERING INFORMATION This octal bus transceiver is designed for 1.65-V to 3.6-V VCC operation. The SN74LVC245A is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. FEATURES • Operates From 1.65 V to 3.6 V • Inputs Accept Voltages to 5.5 V • Max tpd of 6.3 ns at 3.3 V • Typical VOLP (Output Ground Bounce) <0.8 V at VCC= 3.3 V, TA= 25°C • Typical VOHV(Output VOH Undershoot)>2 V at VCC= 3.3 V, TA= 25°C • Ioff Supports Partial-Power-Down Mode Operation • Supports Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltage With 3.3-V VCC) • Latch-Up Performance Exceeds 250 mA PerJESD 17 • ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 1000-V Charged-Device Model (C101)
The MC74LCX245 is a high performance, non-inverting octal transceiver operating from a 2.0 to 5.5V supply. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A V specification of 5.5V allows MC74LCX245 inputs to be safely driven from 5V devices. The MC74LCX245 is suitable for memory address driving and all TTL level bus oriented transceiver applications. Current drive capability is 24mA at both A and B ports. The Transmit/Receive (T/Rbar) input determines the direction of data flow through the bi-directional transceiver. Transmit (active-HIGH) enables data from A ports to B ports; Receive (active-LOW) enables data from B to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a HIGH Z condition. Features ---