IDT74ALVCH162721

NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2. VCC terminals.
3. All terminals except VCC.

This 20-bit flip-flop of the IDT74ALVCH162721 is built using advanced dual metal CMOS technology. The 20 flip-flops of the ALVCH162721 are edge-triggered D-type flip-flops with qualified clock storage.

On the positive transition of the clock (CLK) input, the IDT74ALVCH162721 provides true data at the Q outputs if the clock-enable (CLKEN) input is low. If CLKEN is high, no data is stored. A buffered output-enable (OE) input places the 20 outputs in either a normal logic state (high or low) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without need for interface or pullup components. OE does not affect the internal operation of the flip-flops.

Old data of the IDT74ALVCH162721 can be retained or new data can be entered while the outputs are in the high-impedance state. The ALVCH162721 has series resistors in the device output structure which will significantly reduce line noise when used with light loads. This driver has been designed to drive ±12mA at the designated threshold levels.

The IDT74ALVCH162721 has "bus-hold" which retains the inputs' last state whenever the input goes to a high impedance. This prevents floating inputs and eliminates the need for pull-up/down resistor.