GS2985 Datasheet, PDF (8/45 Pages) Gennum Corporation – Uses standard 27MHz crystal

Table 1-1: GS2985 Pin Descriptions
Pin Number
33
34
35
36
37
38, 40
39
41
42
43
44, 46
45
47
48
51
52
53
55
Name
SD/HD
KBB
DDO1_DISABLE
DATA_MUTE
DATA/CLOCK
DDO1/RCO,
DDO1/RCO
DE1_EN
VCC_DDO1
VEE_DDO1
GND_DRV
DDO0, DDO0
DE0_EN
VCC_DDO0
VEE_DDO0
XTAL_BUF_OUT
XTAL+
XTAL-
CS/EQ3_EN
Type
Output
Analog Input
Logic Input
Logic Input
Logic Input
Output
Logic Input
Power
Power
Power
Output
Logic Input
Power
Power
Output
Output
Input
Input/Logic
Input
Description
This signal will be LOW for all rates other than 270Mb/s.
This signal is HIGH for 270Mb/s.
Controls the loop bandwidth of the PLL. Leave this pin
floating for serial reclocking applications.
Disables the DDO1/RCO and DDO1/RCO outputs
when LOW.
See Section 4.14.
Mutes the DDO0/DDO0 and DDO1/DDO1 (if data is selected) outputs when
LOW.
Set HIGH for normal operation.
DATA/CLOCK select.
See Section 4.14.
Differential serial clock or data outputs.
De-emphasis on/off pin for serial digital output 1.
HIGH = de-emphasis on
LOW = de-emphasis off
Most positive power supply connection for the DDO1/DDO1 output driver.
Connect to 3.3V or 2.5V.
Most negative power supply connection for the DDO1/DDO1 output
driver. Connect to GND.
Connect to GND.
Differential Serial Digital Outputs.
De-emphasis on/off pin for serial digital output 0.
HIGH = de-emphasis on
LOW = de-emphasis off
Most positive power supply connection for the DDO0/DDO0 output driver.
Connect to 3.3V or 2.5V.
Most negative power supply connection for the DDO0/DDO0 output
driver.
Connect to GND.
Buffered output of the reference oscillator.
Reference crystal output.
Reference crystal input.
In host mode (HIF set LOW):
Chip select input for SPI serial host interface. Active-low input.
In non-host mode (HIF set HIGH):
Trace equalization on/off pin for Serial Digital Differential Input 3.
Active-high input.
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
8 of 45
Proprietary & Confidential