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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All digital grounds are linked to this plane. They are provided to facilitate board testing. Following manufacturers’ guidelines, each ACF integrator is decoupled from both rails by 1. Manufacturers of the board were Precision Engineering Products Chesterton Ltd, who will retain the production artwork for a limited time. Before each integration commences, the switch is closed to discharge the integration capacitor, C2. The typical current requirements are:. Failure to do this could result in data bus contention.
The file is in the same archive, under:. This comprises a 2M resistor package RA1A, and 0. The signal is passed through a 0. Dataasheet shielding is provided by the partial groundplane on the component side of the board. The schematic circuit was drawn using OrCAD software. These 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. When the operation is complete, the switch is closed for 2us, discharging the capacitor. 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 digital signal is finally staticized by U7, 74LS This power rail separation is to reduce power born noise. To describe the operation of the circuit, channel 1 is used as an example. This documentation dm74ls37n the 64 channel Digitiser Data Boards designed in These boards were developed for use in Pulsar research.
DM74LS374N 数据手册 ( 数据表 ) – Fairchild Semiconductor
There are nine data boards in the crate supplied, thus allowing up to channels to be digitised. Each comparator package is decoupled from both power rails by 10nF capacitors. 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.
Nearby C, there are two diodes D1, and D2. datashfet
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If the signal is more positive than this level, the output will switch low and if more negative, it will switch high. This is a low noise dual switched integrator that has a built in precision pF capacitor for integration. An integration is then performed across a precision pF capacitor for a single sample interval. The works dstasheet is:.
The function of this filter is to block DC signals and to control the overall sensitivity of the integrator. The output of the comparator is open collector and is thus virtually isolated from the input terminals. This is to supplement an incomplete track. These boards are controlled by one Control Board in the same crate.
These capacitors are identified on the data board and in the schematic as C through Dm74ls37n4 It is a modification to a previous design of This reads data from each board and writes the data to a computer interface along with a count word. The digitiser data board was designed, developed, fabricated and tested by the author.
After testing the data boards out of the crate, it is important to put these switches back to the ‘Normal’ settings, as illustrated dm74l374n figure 2 below, before reinserting into the crate. This would reduce the gain. This is an octal D-type flip flop with tri-state outputs.
The integration period is determined by the separate control board. The operation is identical for all 64 channels.
This is made up of a network of tracks over the board.