Receivers - IBM 1 Series Manual

Receivers
Figure 6-7 shows the input signal electrical circuit.
The input specifications are as follows:
Input voltage: Downlevel: +0.6 volt at
42 mA, maximum
Up level: +2.4 volts, minimum
Input current: < 42 mA at +0.6 volt
Input impedance: 100 ohms
Logical 1: < +1.0 volt
Logical 0: > +2.5 volts
DPC adapter
input Recommended
termination customerdriver
+5 V +10%
150 ohms +10%
Twisted-pair TTL open
300 ohms +2.5% cable collector driver
Ground
Impedance: 100 ohms
Maximum distance: 6.1 m (20 ft)
Ground
Downlevel
+0.6 V at 42 mA,
maximum
Figure 6-7. Input signal electrical circuit
6-12 GA34-0033