DIRECTV Set-Top Box Information for the Installer
DIRECTV, Inc.
March 5, 2008
Version 2.2
Page 40 of 42
DTV-MD-0058
Table 8-2: Input Drive Characteristics
Parameter
Specification
Space voltage
+3.0 volts min, +25 volts max
Mark voltage
-25 volts min, -3.0 volts max
Terminating impedance
resistance
6K < R < 7K resistive to ground
Capacitance
C < 150 pf
8.4 Low-Speed Output Characteristics
8.4.1 Output Drive Characteristics (Pin 2)
The STB output drive characteristics are as shown in Table 8-3.
Table 8-3: Output Drive Characteristics
Parameter
Specification
Space voltage
+5.3 volts max at Ioh = 0 mA,
+3.0 volts min
Mark voltage
-6.0 volts min at Iol = 0 mA, -3.0
volts max,
Terminating impedance
resistance
3k < R < 7k resistive to ground
Capacitance
C < 2500 pF
8.4.2 Passive Outputs (Pins 1, 6, 8, and 9) (Optional)
If the data port optional pins one (1), six (6), eight (8) and nine (9) are provided, the passive outputs
will be as shown in Table 8-4.