14 Threads found on edaboard.com: 74ls74
Unsuitable input waveform might be a problem, however near to maximum frequency, a FF will work with sine input voltage of sufficient magnitude.
But did you review frequency limits in 74xx datasheets? Maximum clock frequency of 7474, 74HC74 and 74ls74 is about 25 MHz. Only 74S74 reaches typically 110 MHz, 74AHC74 even more (but still not 200 MHz
Analog Circuit Design :: 10-16-2016 16:43 :: FvM :: Replies: 5 :: Views: 268
Circuit as shown in pictures:
Design concept: U0 (not shown) is the output of the door before. After delay 0.5 seconds of NE555, the 3 feet of 74ls74 form rising edge and the 5 feet (U1) output high level, through triode connecting relay (not show
Analog Circuit Design :: 07-18-2016 02:02 :: Kimmy10 :: Replies: 1 :: Views: 167
Sorry for such a late reply. I was stuck up with a different project.
I have setup the entire circuit on a vero/strip board. My new circuit is attached.
Now I have a relay at the output of the D flip flop. I also have a small delay circuit in between the relay and the D-FF output. It is just a requirement of my application. At the output of the r
Microcontrollers :: 06-14-2014 09:07 :: RohanDey :: Replies: 23 :: Views: 2204
If you don't need gated D-inputs and gated outputs then you can use any D-register IC with (only) D-registers, eg. 74ls74
Elementary Electronic Questions :: 06-09-2013 00:03 :: DrWhoF :: Replies: 4 :: Views: 1074
i need to get a pulse detection circuit using 4013 d-flipflop ic or can u suggest 15 v input equivalent of 74ls74 .
Analog Circuit Design :: 11-02-2012 06:06 :: rakesh1987 :: Replies: 2 :: Views: 760
In this case you need to use a Common Anode 7 segment LEDs display.
Seven Segment Display
Common anode to be connected to the Vcc pin.
Look here for an example how to connect the 74ls74 with the 7 segment LED display.
Elementary Electronic Questions :: 01-10-2012 08:47 :: mister_rf :: Replies: 5 :: Views: 655
Is there any 74ls74 quad or octal flip flop equivalent? In need Q as well as Qbar outputs.
Elementary Electronic Questions :: 10-01-2011 09:44 :: neazoi :: Replies: 1 :: Views: 1697
1. I understand that I can't use TTL gates/flip-flops. What's the remplacement in CMOS? I use the following TTL's: 74LS32 (or another multiple input OR gate), 74ls74 (flip-flop)
The ooold metallic-gate CMOS series 4000 and 4500 allow that logic levels (from 0-5 V to 0-15 V).
2. I need t
Elementary Electronic Questions :: 05-25-2011 21:01 :: zorro :: Replies: 1 :: Views: 498
hi i am using 74ls74 for motor driver but its not working i am not geting change in output according change in input i am giving 1 s clk pulse and change in d is 1sec also can any one help me
Microcontrollers :: 05-16-2011 01:31 :: ud23 :: Replies: 2 :: Views: 633
You can check the function of those pins in 74ls74 datasheet.
74ls74 Datasheet pdf - Dual Positive-Edge-Triggered D Flip-Flops with Preset/ Clear and Complementary Outputs - Fairchild Semiconductor
As a suggestions, since you have to use 2 those ICs to divide frequency
Microcontrollers :: 01-20-2011 05:30 :: DineshSL :: Replies: 6 :: Views: 2230
we are trying to do a project and we have to use a d-flip fliop in schematic editor. what is the most basic part to use?
It depends upon which logic family you want to use, ie. TTL or CMOS
In the TTL family, there is the 7474, 74ls74, etc.
In the 4000 series CMOS there is 4013, 40174, 40175
In the 74H
Elementary Electronic Questions :: 12-13-2010 21:17 :: ljcox :: Replies: 1 :: Views: 1888
If the output should be 1 an undefined amount of time, not just a constant period, before reset, you need a latch or bistable.
Use 74ls74, or 4013, connecting the D and CLK inputs to ground. Use S to set and R to reset.
You can build the same circuit with 2 transistors and some resistors.
Hobby Circuits and Small Projects Problems :: 07-12-2007 08:38 :: Eugen_E :: Replies: 3 :: Views: 2583
I am new to this forum as well as Orcad.
I having some problems simulating a Flip-Flop ( 74ls74 from the psice lib)
When running the simulation I can see the alternating digital output from dstm into the clk of the flip-flop but when monitoring the D Q and QBar of the flip-flop all I see is three red flat lines ie no digital out
PCB Routing Schematic Layout software and Simulation :: 02-08-2007 09:57 :: paragon :: Replies: 5 :: Views: 27446
I just start to learn HDL and choose to study verilog. I try to write D-FF (74ls74), but it shows some errors. I've seen some D-FF example but those did not include preset and clear.
What wrong with my program? Please help me. Thanks alot.
Following is my program by using Xilinx
module dffpc(d, q, preset, clear, clk);
PLD, SPLD, GAL, CPLD, FPGA Design :: 02-02-2005 05:00 :: MRFGUY :: Replies: 1 :: Views: 2899