Apr 8, 2010 #1 P PCBwire Newbie level 6 Joined Mar 27, 2010 Messages 12 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,357 Latch output and led May i connect latch output directly to led and resistor. Or NPN darlington array have to be used.
Latch output and led May i connect latch output directly to led and resistor. Or NPN darlington array have to be used.
Apr 8, 2010 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 Re: Latch output and led Every logic family is characterized by different output drive current .. For example, 74ACT logic family can drive +/- 24mA of IOH and IOL .. Any output current above ≈5mA can directly drive an LED (via a resistor) .. You have to google for I[OH] of your latch .. Rgds, IanP
Re: Latch output and led Every logic family is characterized by different output drive current .. For example, 74ACT logic family can drive +/- 24mA of IOH and IOL .. Any output current above ≈5mA can directly drive an LED (via a resistor) .. You have to google for I[OH] of your latch .. Rgds, IanP
Apr 8, 2010 #3 P PCBwire Newbie level 6 Joined Mar 27, 2010 Messages 12 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,357 Re: Latch output and led I oh, ol, is ± 50mA, so that should do it. Vcc = 5V Voh = 5V and resistor 1kΩ. Thank you for help.
Re: Latch output and led I oh, ol, is ± 50mA, so that should do it. Vcc = 5V Voh = 5V and resistor 1kΩ. Thank you for help.