CO4020 Quad 4-Input Logic Unit

 Specifications

The Model CO4020 incorporates four separate channels with identical functions. The specifications apply to each of the four channels unless stated otherwise.

PERFORMANCE

NUMBER OF IDENTICAL CHANNELS 4.

MAXIMUM COUNT RATE
X and Outputs 100 MHz.
Y Outputs 1/(1.1 X width).

MINIMUM PULSE OVERLAP 3 ns.

PROPAGATION DELAY
Input to X, <8 ns.
Input to Y (Neg) <13 ns.
Input to Y (Pos) <20 ns.

DEAD TIME OF Y OUTPUTS 110% of width setting.

INPUTS

A, B, C, AND D INPUTS Front-panel LEMO connectors accept negative fast-NIM logic signals.
Minimum Amplitude –600 mV.
Minimum Width 3 ns.
Input Impedance 50 W.

GATE INPUT (G) Front-panel LEMO connector accepts negative Fast-NIM logic signals. The GATE input is delivered to all four sections.
Minimum Amplitude –600 mV.
Minimum Width 3 ns.
Input Impedance 50 W.

OUTPUTS

X AND OUTPUTS Front-panel LEMO connectors provide the noninverted (X) and the inverted () result of the logic satisfied by the input signals. Logic requirements are set by the front-panel slide switches A/OFF/, B/OFF/, C/OFF/, D/OFF/, and G/OFF/. X and are Fast-NIM logic signals.
Amplitude –20 mA.
Rise Time <4 ns.
Output Width Determined by duration of input signals and logic selection.

Y OUTPUTS ( and ) Front-panel LEMO connectors provide two updating Fast-NIM logic outputs ( ) and one updating positive TTL logic output ( ) per channel. Output width of all three Y outputs is set by WIDTH adjustment. Y outputs are triggered by either the negative transition (¯) or positive transition (­) of the X overlap output as selected by the front-panel slide switch.

CONTROLS AND INDICATORS

WIDTH ADJUST (W) Front-panel screwdriver adjustment allows width adjustment of Y outputs. Two ranges can be selected by the front-panel slide switch: S (40–1200 ns) or L (1–40 µs).

LED INDICATOR Front-panel, red LED lights when output has been activated.

CONTROL SWITCHES Front-panel 7- by 3-position slide switch selects logic function definition, gate operation, Y output trigger point, and Y output width adjustment range as follows:

Input Logic Switches (A/OFF/, B/OFF/, C/OFF/, D/OFF/, AND G/OFF/) As defined in Fig. 1, these switches select variations of the following basic logic functions. In the OFF position, the state of that input is ignored. With switches set to the A, B, C, D, and G positions, the module performs the OR function at the output.

X = A + B + C + D + G

Setting the switches to the , , , , and positions provide the AND (coincidence) function at the output.

= A · B · C · D · G

Changing the switch to G implements the common-gate veto (anticoincidence)

= A · B · C · D ·

See Fig. 1 to determine other possible logic combinations.Trigger Switch for Y Outputs (¯ or ­) Allows either the negative transition (¯) or the positive transition (­) of the X output to trigger the constant-width Y outputs.

Y Output Width Range Switch Sets either to S (40–1200 ns) or L (1–40 µs).

ELECTRICAL AND MECHANICAL

POWER REQUIRED The Model CO4020 derives its power from a standard NIM bin and power supply. The required power is +6 V, 200 mA; –6 V, 1000 mA.

WEIGHT
Net 1.3 kg (2.3 lb).
Shipping 2.2 kg (4.8 lb).

DIMENSIONS NIM-standard single-width module 3.43 X 22.13 cm (1.35 X 8.714 in.) per DOE/ER-0457T.

Fig. 1. Block Diagram of the Model CO4020 Logic Unit.

ORDERING INFORMATION