HCT4511

The 74HC/HCT4511 are high-speed Si-gate CMOS  devices and are pin compatible with "4511" of the "4000B"  series. They are specified in compliance with JEDEC  standard no. 7A.

The 74HC/HCT4511 are BCD to 7-segment  latch/decoder/drivers with four address inputs (D1 to D4),  an active LOW latch enable input (LE), an active LOWripple blanking input (BI), an active LOW lamp test input  (LT), and seven active HIGH segment outputs (Qa to Qg). When LE is LOW, the state of the segment outputs (Qa to  Qg) is determined by the data on D1 to D4.  When LE goes HIGH, the last data present on D1 to D4 are  stored in the latches and the segment outputs remain  stable.

WhenLT is LOW, all the segment outputs of 74HC/HCT4511 are HIGH  independent of all other input conditions. With LT HIGH, a  LOW on BI forces all segment outputs LOW. The inputs LT  and BI do not affect the latch circuit.