Order Number DM54LSJ, DM54LSW, DM74LSWM or DM74LSN. See Package Number J20A, M20B, N20A or W20A 2. Download Fairchild Semiconductor DM74LSN pdf datasheet file. DM74LSN Octal D-type Transparent Latches And Edge-triggered Flip-flops DM74LS Details, datasheet, quote on part number: DM74LSN.

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To describe the operation of the circuit, channel 1 is used as an example. This is to supplement an incomplete track. Failure to do this could result in data bus contention.

DM74LSN Datasheet PDF – National ->Texas Instruments

The integration period is determined by the separate control board. The typical current requirements are:. The operation is identical for all 64 channels.

There is considerable decoupling throughout the board. All digital grounds are linked to this plane. The file is in the same archive, under:.

74LS Datasheet catalog

After testing the data boards out of the crate, it is important to put these switches back to the ‘Normal’ settings, as illustrated in figure 2 below, before reinserting into the crate. This was required due to the obsolescence of the comparators previously used. They are provided to facilitate board testing. The two unused controls datxsheet pulled high by resistors R1 and R2.

Test Switches There are two switches on the board selected by jumpers. The output of the comparator is open collector and is thus virtually isolated from the input terminals. This is a low noise dual switched integrator that has a built in precision pF capacitor for integration.


The schematic circuit was drawn using OrCAD software. This is an octal D-type flip flop with tri-state outputs.

Stock/Availability for: DM74LSO2N

There are nine data boards in the crate supplied, thus allowing up to channels to be digitised. This power rail separation is to reduce power born noise.

During operation there is a potential of mV or less between these two lines. Each comparator package is decoupled from both power rails by 10nF capacitors.

These capacitors are identified on the data board and in the schematic as C through C This would reduce the gain. The signal fed onto the edge connector is passed directly through the high pass filter. The works reference is:. These boards are controlled by one Control Board in the same crate.

These boards were developed for use in Pulsar research. The signal is passed through a 0. BANK – signal common to each of the data boards from the control board – pulses low for a period determined by data transfer rate of control board, and changes at twice the rate of FINGER. Secondly, the component pads adjacent to the ACF packages allow for the addition of a capacitor in parallel to the internal pF.


This IC is a quad programmable comparator selected for its low and repeatable input dm74ls734n voltages.

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If the signal is more positive than this level, the output will switch low and dm74ls374h more negative, it will switch high. These are wired back to back between the two ground levels. Full circuit details and user instructions for the control board are dm774ls374n a separate document. A 27k resistor R5 is in series with the output of the comparator to protect the datqsheet of the following stage, since the comparator output switches down to the V rail. The digital signal is finally staticized by U7, 74LS Nearby C, there are two diodes Datasneet, and D2.

Before each integration commences, the switch is closed to discharge the integration capacitor, C2. Manufacturers of the board were Precision Engineering Products Chesterton Ltd, who will retain the production artwork for a limited time.

This is made up of a network of tracks over the board. This reads data from each board and writes the data to a computer interface along with a count word. Refer to the complete schematic diagram at the end of this section.