GS9015A PIN DESCRIPTIONS cont.
PIN NO
SYMBOL TYPE
DESCRIPTION
18
19
V
Power Supply. Most positive power supply connection. (VCO, MUX, Standard Select).
CC2
CD
Output
Carrier Detect. Open collector output which goes HIGH when a signal is present at either the Serial
Data inputs or the Direct Digital inputs. This output is used in conjunction with the GS9000B or GS9000S
in the Automatic Standards Select Mode to disable the 2 bit standard select counter. This pin should
see a low AC impedance (e.g. 1nF to AC Gnd)
20,21
SS0, SS1 Inputs
Standard Select Inputs. TTL inputs to the 2:4 multiplexer used to select one of four VCO centre
frequency setting resistors (R
- R
). When both SS0 and SS1 are LOW, R
is selected.
VCO0
VCO3
VCO0
When SS0 is HIGH and SS1 is LOW, R
is selected. When SS0 is LOW and SS1 is HIGH, R
VCO2
VCO1
is selected and when both SS0 and SS1 are HIGH, R
low AC impedance (e.g. 1nF to AC Gnd)
is selected. These pins should see a
VCO3
22,23
24,25
SCO/SCO Outputs
SDO/SDO Outputs
Serial Clock Outputs (inverse and true). Pseudo-ECL differential outputs of the extracted serial clock.
These outputs require a 390 Ω pull-down resistors to V
.
EE
Serial Data Outputs (inverse and true). Pseudo-ECL differential outputs of the regenerated serial data.
These outputs require a 390 Ω pull-down resistors to V
.
EE
26
27
28
V
Power Supply. Most positive power supply connection. (ECL Outputs).
Power Supply. Most negative power supply connection. (Phase Detector, Carrier Detect)
Power Supply. Most negative power supply connection.
CC3
V
EE2
VEE1
INPUT / OUTPUT CIRCUITS
V
CC
+
-
1.2V
2k
1k
2k
1k
DDI
Pin 5
DDI
Pin 6
+
-
380µA
1.6V
Fig. 3 Pins 1, 5 and 6
520 - 99 - 05
5
GENNUM [ GENNUM CORPORATION ]
