MC74LCX16646

The MC74LCX16646 is a high performance, noninverting 16bit transceiver/registered transceiver operating from a 2.7 to 3.6V supply. The device is byte controlled. Each byte has separate control inputs which can be tied together for full 16bit operation. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A V_I specification of 5.5V allows MC74LCX16646 inputs to be safely driven from 5V devices. The MC74LCX16646 is suitable for memory address driving and all TTL level bus oriented transceiver applications.

Data of MC74LCX16646 on the A or B bus will be clocked into the registers as the appropriate clock pin goes from a LOWtoHIGH logic level. Output Enable (OEn) and Direction Control (DIRn) pins are provided to control the transceiver outputs. In the transceiver mode, data present at the high impedance port may be stored in either the A or the B register or in both.The select controls (SBAn, SABn) can multiplex stored and realtime (transparent mode) data. The DIR determines which bus will receive data when OE is active LOW. In the isolation mode (OE HIGH), A data may be stored in the B register or B data may be stored in the A register. Only one of the two buses, A or B, may be driven at one time.

• Designed for 2.7 to 3.6V V_CC Operation
• 5.2ns Maximum t_pd
• 5V Tolerant - Interface Capability With 5V TTL Logic
• Supports Live Insertion and Withdrawal
• IOFF Specification Guarantees High Impedance When V_CC = 0V
• LVTTL Compatible
• LVCMOS Compatible
• 24mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current in All Three Logic States (20mA)
Substantially Reduces System Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance: Human Body Model >2000V; Machine Model >200V