20 pcs of 74LS90 7490 Logic IC DECADE COUNTERS / Integrated Circuit Product Category: Counter Shift Registers Counter Type: Decade , Counting Sequence: UP Counter , Number of Output Lines: 4 , Number of Circuits: Single Propagation Delay Time: 50 ns @ 5 V , Supply Voltage (Max): 5.25 V , Maximum Operating Temperature: 70 C Logic Family: LS , Logic Type: Bipolar , Operating Supply Voltage: 5 V Packaging: Tube , Function: Counter/Divider , Package / Case: PDIP-14 , RoHS: Yes