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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Following manufacturers’ guidelines, each ACF integrator is decoupled from both rails by 1.

There are nine data boards in the crate supplied, thus allowing up to channels to d,74ls374n digitised. To describe the operation of the circuit, channel 1 is used as an example.

DM74LSN Datasheet(PDF) – National Semiconductor (TI)

This is made up of a network of tracks over the board. An integration is then performed across a precision pF capacitor for a single sample interval. These capacitors are identified on the data daatasheet and in the schematic as C through C The digital signal is finally staticized by U7, 74LS These boards were developed for use in Pulsar research.

Refer to the complete schematic diagram at the end of this section. Dztasheet are wired back to back between the two ground levels. Secondly, the component pads adjacent to the ACF packages allow for the addition of a capacitor in parallel to the internal pF.

The schematic circuit was drawn using OrCAD software. This reads data dm74sl374n each board and writes the data to a computer interface along with a count word. This IC is a quad programmable comparator selected for its low and repeatable input offset voltages. The file is in the same archive, under:.


This documentation concerns the 64 channel Digitiser Data Boards designed in The signal is passed through a 0. There is considerable decoupling throughout the board. Each comparator package is decoupled from both power rails by 10nF capacitors.

The works reference is:. 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. The signal fed onto the edge connector is passed directly through the high pass filter.

There is a separate regulator for the digital Vcc, U After dm74ls347n the data boards out of the crate, it is important to put these switches back to dm774ls374n ‘Normal’ settings, as illustrated in figure 2 below, before reinserting into the crate. If the signal is more positive than this level, the output will switch low and if more negative, it will switch high. A 27k resistor R5 is in series with the output of the comparator to protect the input of the following stage, since the comparator output switches down to the V rail.

54LS374 Datasheet PDF

The function of this filter is to block DC signals and to control the overall sensitivity of the integrator. Nearby C, there are two diodes D1, and D2. These boards are controlled by one Control Board in the same crate. This power datashedt separation is to reduce power born noise.


The two em74ls374n controls are pulled high by resistors R1 and R2. Before each integration commences, the switch is closed to discharge the integration capacitor, C2. Test Switches There are two switches on the board selected by jumpers. Full circuit details and user instructions for the control board are datasheft a separate document. The output of the comparator is open collector and is thus virtually isolated from the input terminals.

During operation there is a potential of mV or less between these two lines. It is a modification to a previous design of This dataasheet required due to the obsolescence of the comparators previously used.

The sign of the output of the integrator is detected by a comparator, the output of which is written onto one bit of a 64 bit data register comprising a D-type latch.

Manufacturers of the board were Precision Engineering Products Chesterton Ltd, who will retain the production artwork for a limited time.