74HC191PW,112

Counter Single 4Bit Sync Binary UP/Down 16Pin TSSOP Tube

Counter IC Binary Counter 1 Element 4 Bit Positive Edge 16-TSSOP

得捷:
IC 4BIT BINARY UP/DN CNT 16TSSOP

艾睿:
Counter Single 4-Bit Async Binary UP/Down 16-Pin TSSOP Bulk