DM74LS469
Description
The ’LS469 is an 8-bit synchronous up/down counter with parallel load and hold capability. Three function-select inputs (LD, UD, CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK). The LOAD operation loads the inputs (D7- D0) into the output register (Q7- Q0). The HOLD operation holds the previous value regardless of clock transitions. The INCREMENT operation adds one to the output register when the carry-in input is TRUE (CBI = LOW), otherwise the operation is a HOLD. The carry-out (CBO) is TRUE (CBO = LOW) when the output register (Q7- Q0) is all HIGHs, otherwise FALSE (CBO = HIGH). The DECREMENT operation subtracts one from the output register when the borrow-in input is TRUE (CBI = LOW), otherwise the operation is a HOLD. The borrow-out (CBO) is TRUE (CBO = LOW) when the output register (Q7- Q0) is all LOWs, otherwise FALSE (CBO = HIGH). The output register (Q7- Q0) is enabled when OE is LOW, and disabled (HI-Z) when OE is...
