IBM 1 Series - DPC Adapter Electrical Characteristics; Drivers 6-1]

DPC Adapter Electrical Characteristics
Drivers
The DPC adapter drivers and terminators are designed to interface with
cables that have a characteristic impedance of approximately 100 ohms.
All DPC adapter interface lines are down-level active; the interface is
nonisolated, TTL compatible.
Figure 6-6 shows the output signal electrical circuit.
The output specifications are as follows:
Driver type: TTL open collector
Output voltage: Up level: +2.4 volts
leakage current, minimum;
I, = 40 pa at
2.4 V, maximum
Down level: +0.7 volt at
175 mA, maximum
Input current: Maximum current sinking capacity,
175 mA at +0.7 volt
Recommended
DPC
adapter
termination
output driver +5 V +10%
IL
150 ohms +5%
TTL open Twisted-pai TTL load
collector ie “part 300 ohms +5%
driver cable .
| Ground
Impedance: 100 ohms
Maximum distance: 6.1 m (20 ft)
Ground
Up level: +2.4 volts leakage
current, minimum
IL = 40 pa at 2.4V,
maximum
Down level: +0.7 volt at 175 mA,
maximum
Figure 6-6. Output signal electrical circuit
Customer Direct Program Control (DPC) Adapter Feature 6-11