The 74HC4511; 74HCT4511 is a BCD to 7-segment latch/decoder/driver with four address inputs (A, B, C, D), a latch enable input (LE), a ripple blanking input (BI), a lamp test input (LT), and seven segment outputs (a to g). WhenLEis LOW, the state of the segment outputs (a to g) is determined by the data on A to D. WhenLEgoes HIGH, the last data present on A to D are stored in the latches and the segment outputs remain stable. WhenLTis LOW, all the segment outputs are HIGH independent of all other input conditions. WithLTHIGH, a LOW onBIforces all segment outputs LOW. The inputsLTandBIdo not affect the latch circuit. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.