4位双向计数器与3态输出 4-Bit Bidirectional Counter with 3-STATE Outputs
General Description
The 74F569 is a fully synchronous, reversible counter with 3-STATE outputs. The 74F569 is a binary counter, featur ing preset capability for programmable operation, carry look ahead for easy cascading, and a U/Dinput to control the direction of counting. For maximum flexibility there are both synchronous and master asynchronous reset inputs as well as both Clocked Carry CC and Terminal Count TC out puts. All state changes except Master Reset are initiated by the rising edge of the clock. A HIGH signal on the Output
Features
■Synchronous counting and loading
■Lookahead carry capability for easy cascading
■Preset capability for programmable operation
■3-STATE outputs for bus organized systems