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The 74LS12 Triple 3-Input Positive NAND Gates With Collector Outputs contains three 3 input independent gates each of which performs the positive logic NAND function. 74LS12 IC can be soldered directly to the circuit board or can be mounted on a 14 pin IC base. 74LS12 Triple 3-Input Positive NAND Ga..

The 74LS21 is an IC which contains two independent 4 input AND gate each of which performs the logic AND function.74LS21 Dual 4-Input Positive and Gates ICFeatures of 74LS21 Dual 4-Input Positive and Gates IC:Supply Voltage: 5.25 V.HIGH Level Input Voltage: 2 V.LOW Level Input Voltage: 0.8 V.HIGH Le..