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74HC02 Quad 2-Input NOR Gate
Chip Features
Logic Type: NOR
Output Current: 5.2mA
No. of Inputs per gate: 2
Supply Voltage Min: 2V
Supply Voltage Max: 6V
Logic Case Style: DIP
No. of Pins: 14
The main difference between the LS and HC is the logic of 74XX.
The 74LS is Transistor to Transistor logic. Uses Shottky transistors to reduce the stored charge and get higher switching speeds then with conventional bipolar transistors.
The 74HC uses MOSFET technology. Therefore can operate with wider variety of voltages. Power consumption better then TTL (but increases at higher frequencies). Has better noise margins so can work in noisy environments compared to TTL.
74HC are becoming more and more better replacements to older 74LS
Transition speeds are not too much different.
Prop delays for:
74LS - tpLH and tpHL about 15 nsec.
74HC - tpd about 18 nsec.
This seller has been a member since: Nov. 24, 2015
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