RAM/Latch Type IC

integrated-circuitlatchram

I was looking to find an IC (particularly in the 7400 series) that could act as a very simple RAM device, like a flip-flop or something. I came across 74hc373, but I'm not sure this is what I'm looking for. It seems that the values on all the inputs are held only when latch enable goes from high to low. What I need is something like this, but without the latch enable or clock input requirement, since I would be accessing each bit individually. So, like one input for data and then another for resetting the held data.
Does anyone know an IC that could do this?
Thanks

P.S. if possible I would like and IC that has eight latches/ram bits (or whatever they would be called), just for the convenience of one byte.

Best Answer

If you want to store 8 bits, the 74HC259 may be what you're after. You'd have to add a 74HC138 if you want an addressable readout, but the 74HC259 is a readily-available part which has eight independently-writable bits.

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If you're using a Xilinx FPGA, use an ODDR output buffer to generate an output clock signal at the same rate as the internal clock. Other FPGAs should have similar features.

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    .C                (clk),
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);

Or you could just forget the DAC, and build an R-2R network yourself. Definitely would be a lot cheaper.

Electronic – Purpose of the Latch Enable (\$\overline{LE}\$) and Ripple Blanking (\$\overline{BI}\$) pins on 74HC4511

If the 4-bit data input to one 4511 is being shared with another 4511, LE allows you to set-up the 4-bit data for one device (then store it on internal registers). Then you can set up the appropriate 4-bit data (using the same data lines) for another 4511 and have a separate LE pin to store this different data to the 2nd device.

If you didn't have this feature you would have to use 4 lines dedicated to each driver and that is inefficient.

The blanking input disables all segments.

Best Answer

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