NIM Model 429 Quad Logic Fan-in/Fan-Out

The LRS Model 429 represents a new advance in efficient fast logic signal handling. It combines in one low cost unit three functions formerly available only separately: fan-in, fan-out, and polarity inversion. Each channel of the Model 429 contains four independent logic inputs, four normal logic outputs, and two complementary logic outputs. Channels may be paralleled to provide up to 16 inputs and 24 outputs by means of a front-panel switch. An efficient circuit design holds the power dissipation of the entire module to within the NIM standard.

The Model 429 eliminates the extra cabling and time delay involved when conventional fan-ins and fan-outs must be cascaded. In addition, it eliminates the common use of expensive logic units to perform logical OR-ing with adequate fan-out. The ability to conveniently parallel channels permits the 429 a degree of flexibility and efficiency heretofore unavailable.

Inputs are 50Ohm impedance. Unused inputs need not be terminated. Inputs may be driven with either single or double amplitude NIM signals without affecting output amplitude. The three pairs of bridged outputs are direct-coupled current sources which deliver -32 mA into two 50Ohm loads. Output duration is equal to the logical sum of the input durations.

The circuitry of the Model 429 is completely direct-coupled and compatible with either normal or complementary logic signals in any duty ratio. Channel paralleling is accomplished by means of a single front-panel locking switch that is not in the signal path and hence permits switching with minimal effect on signal fidelity. Front-panel lamps located between channels light to indicate channels that are combined, providing a clear, easily interpreted display of the unit's status.

NIM Model 429 QUAD LOGIC FAN-IN/FAN-OUT

SPECIFICATIONS

Number of Sections:

Four; may be cascaded by means of front-panel switch to form dual 8-fold fan-in/12-fold fan-out or single 16-fold fan-in/24-fold fan-out, with LED indica- tion.

INPUT CHARACTERISTICS

Number of Inputs:

Four per section.

Impedance:

50ohm -- 5%.

Reflections:

< 10% for input risetimes -- 2 ns.

Quiescent Level:

0 volts dc.

Signal Level Requirements:

Standard NIM logical 1 input levels: -12 mA to -36 mA into 50ohm.

Signal Width Requirements:

4 ns minimum, FWHM.

Coupling:

Direct.

OUTPUT CHARACTERISTICS

Number of Outputs:

4 normal (2 bridged pairs); 2 complementary (1 bridged pair).

Output Levels:

Normal: quiescently 0 volts, > -700 mV into 50ohm during output; complementary: quiescently > -700 mV into 50ohm, 0 volts during output.

Risetimes and Falltimes:

2.3 ns typical, 2.8 ns maximum.

Duration:

Equal to the logical sum of the input durations.

Time Variation of Output with Input Amplitude:

< 1 ns worst case between inputs of -600 mV and -1.6 volts; typically < 0.5 ns.

Time Variation Between Outputs:

4 channels, 4 x 6 operation: < 0.2 ns;
2 channels, 8 x 12 operation: < 0.4 ns;
1 channel, 16 x 24 operation: < 0.9 ns.

GENERAL

Rate:

100 MHz.

Stage Delay

< 6.5 ns.

Duty Cycle Limitations:

None.

Packaging:

Single-width AEC/NIM module; in conformance with AEC standard for nuclear modules (AEC Report TID-20893); Lemo-type connectors.

Current Requirements:

+12 V at 35 mA
+6 V at 175 mA
-12 V at 50 mA
-6 V at 450 mA

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Number of Sections:	Four; may be cascaded by means of front-panel switch to form dual 8-fold fan-in/12-fold fan-out or single 16-fold fan-in/24-fold fan-out, with LED indica- tion.
INPUT CHARACTERISTICS
Number of Inputs:	Four per section.
Impedance:	50ohm -- 5%.
Reflections:	< 10% for input risetimes -- 2 ns.
Quiescent Level:	0 volts dc.
Signal Level Requirements:	Standard NIM logical 1 input levels: -12 mA to -36 mA into 50ohm.
Signal Width Requirements:	4 ns minimum, FWHM.
Coupling:	Direct.
OUTPUT CHARACTERISTICS
Number of Outputs:	4 normal (2 bridged pairs); 2 complementary (1 bridged pair).
Output Levels:	Normal: quiescently 0 volts, > -700 mV into 50ohm during output; complementary: quiescently > -700 mV into 50ohm, 0 volts during output.
Risetimes and Falltimes:	2.3 ns typical, 2.8 ns maximum.
Duration:	Equal to the logical sum of the input durations.
Time Variation of Output with Input Amplitude:	< 1 ns worst case between inputs of -600 mV and -1.6 volts; typically < 0.5 ns.
Time Variation Between Outputs:	4 channels, 4 x 6 operation: < 0.2 ns; 2 channels, 8 x 12 operation: < 0.4 ns; 1 channel, 16 x 24 operation: < 0.9 ns.
GENERAL
Rate:	100 MHz.
Stage Delay	< 6.5 ns.
Duty Cycle Limitations:	None.
Packaging:	Single-width AEC/NIM module; in conformance with AEC standard for nuclear modules (AEC Report TID-20893); Lemo-type connectors.
Current Requirements:	+12 V at 35 mA +6 V at 175 mA -12 V at 50 mA -6 V at 450 mA