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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DM74LSN/A+ Datasheet – Flip-Flop from National Semiconductor

This reads data from each board and writes the data to a computer interface along with a count word. The schematic circuit was drawn using OrCAD software. These boards were developed for use in Pulsar research. Failure to do this could result dataxheet data bus contention. This IC is a quad programmable comparator selected for its low and repeatable input offset voltages.

54LS374 Datasheet PDF

The typical current requirements are:. The two unused controls are pulled high by resistors R1 and R2. The signal is passed through a 0.

Full circuit details and user instructions for the control board are in a separate document. Each comparator package is decoupled from both power dm74lls374n by 10nF capacitors. This is a low noise dual switched integrator that has a built in precision pF capacitor for integration.


These are wired back to back between the two ground levels. This is to supplement an incomplete track. This documentation concerns the 64 channel Digitiser Data Boards designed in These boards are controlled by one Control Board in the same crate.

The output of the comparator is open collector and is thus virtually isolated from the input terminals. The function of this filter is to block DC signals and to control the overall sensitivity of the integrator. This is datasheett octal D-type flip flop with tri-state outputs.

This would reduce the gain. After testing the data boards out of the crate, it is important to put these switches back to the ‘Normal’ dm74ls3774n, as illustrated in figure 2 below, before reinserting into the crate.

The digitiser data board was designed, developed, fabricated and tested by the author. The file is in the same archive, under:. 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.

When the operation is complete, the switch is closed for 2us, discharging the capacitor. The works reference is:. This comprises a 2M resistor package RA1A, and 0. If the signal is more positive than this level, the output will switch low and if more negative, it will switch high. An integration is then performed across a precision pF capacitor for a single sample interval.


This power rail separation is to reduce power born noise.


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 integration period is determined by the separate control board. These capacitors are identified on the data board and in the schematic as C through C Nearby C, there are two diodes D1, and D2. There is considerable decoupling throughout the board. They are provided dm74ps374n facilitate board testing.