Model 752
Model 752
FEATURES
* 150 MHz RATE CAPABILITY
* FOUR INDEPENDENT CHANNELS
* HIGH FAN-OUT WITH SIX OUTPUTS PER CHANNEL
* DEADTIMELESS UPDATING OPERATION
* 1 nSEC INPUT OVERLAP WIDTH
* FAST VETO AND BIN GATE INHIBITING
DISCRIPTION
The model 752 is a high-performance, four-channel, two- input logic unit packaged in a single-width NIM module. It performs logical AND, OR, fan-in and fan-out functions.
Each channel has two logic inputs, a two position switch for selecting the logic function desired, an output width control, and six outputs. A fast veto is common to all four channels which permits anti-coincidence decisions. In addition, a bin gate applied via the rear panel connector inhibits the entire module and is enabled or disabled from a rear panel slide switch. After the inputs have satisfied the logic function desired, triggering of an updating regenerative stage produces a standardized output pulse, inde- pendent of the input pulse shapes or overlap times. Output durations are continuously variable over the range of 4 nSEC to 1 uSEC. The updating design ensures deadtimeless operation, while the double-pulse resolution is 6.5 nSEC for fast counting applications.
The 752 has six high-impedance current switching outputs per channel. They are configured as two pairs of double-amplitude bridged outputs and two complemented NIM levels. When only one output from the bridged pair is used, a double-amplitude NIM pulse (-32 mA) is generated for driving long cables. Two normal NIM levels are produced when both of the bridged outputs operate into 50 ohm loads. The output risetimes and falltimes are typically 1 nSEC, and their shapes are virtually unaffected by the loading conditions of the other outputs.
INPUT CHARACTERISTICS
Logic Inputs
Two LEMO connector inputs per channel; direct
coupled; 50 ohm input impedance; accepts NIM
level logic signals (-500 mV or greater); outputs
will be produced with inputs of 1 nSEC or greater
width; inputs are protected against damage from
+/-100 Volts transients of 1 uSEC.
Fast Veto
One LEMO connector input common to all four
channels; accepts normal NIM level pulse
(-500 mV); 50 ohm impedance; direct coupled;
the veto input must precede by 5 nSEC, the
leading edge of the input signal that would
ordinarily satisfy the logic conditions. Requires a
4 nSEC minimum input pulse width.
Din Gate
Rear panel slide switch enables or disables the
slow bin gate via the rear connector. Signal levels
are in accordance with the TID-20893 standard.
Responds in approximately 10 nSEC to a bin gate
signal.
OUTPUT CHARACTERISTICS
General
Six LEMO connector outputs per channel; two
pairs of bridged NIM outputs and two com-
plemented outputs; the bridged outputs deliver
a double-amplitude pulse of -32 mA (-1.6 Volt
into a single 50 ohm load, or -800 mV when both
outputs are 50 ohm terminated). The com-
plemented outputs are quiescently -16 mA (-BOO
mV into 50 ohms) and switch to 0 mA when
active. Output rise and falltimes are less than 1.5
nSEC. And the output pulse shapes are optimized
when the bridged outputs are 50 ohm
terminated.
Width Control:
One control per channel; 15-tum screwdriver
adjustment; outputs continuously variable
from 4 NSEC to 1 uSEC. Output width stability
is +/-.15%/'C of setting.
Updating Operation:
The output pulse width will be extended should
another input occur while the output is active.
This provides deadtimeless operation with 100%
duty cycle achievable.
GENERAL PERFORMANCE
Logic Functions:
Logic AND, OR, Fan-In/Fan-Out. All functions have leading-edge inhibit
and produce standardized outputs.
Rate:
150 MHz minimum, input to output. Typically 160 MHz.
Double-Pulse Resolutloni
Less than 6.5 nSEC; Typically 6 nSEC with output width set at minimum
Coincidence Width:
Overlap times of 1 nSEC or greater will produce outputs.
Multiplw-Pulsing:
One and only one output pulse regardless of input pulse amplitude or duration.
Input to Output Delay:
Less than 8 nSEC.
Power Supply Requirements:
-6 V @ 395 mA +6 V @ 250 mA
-12 V @ 165 mA +12 V @ 0mA
-24 V @ 60 mA +24 V @ 35 mA
115 VAC @ 55 mA
Note: All currents are within NIM specifications limits allowing a full
powered bin to operate without overloading.
Operating Temperature:
O'C to 70'C ambient.
Packaging:
Standard single width NIM module in accordance with TID-20893 and section ND-524.
Options:
Consult factory to find out about available options.
