HDMP-2634 Avago Technologies US Inc., HDMP-2634 Datasheet - Page 17

• Manufacturer Part Number: HDMP-2634
• Manufacturer: Avago Technologies US Inc.

Specifications of HDMP-2634

• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Not Compliant

Figure 11. I-SSTL2 and O-SSTL2 simplified circuit schematic.
I/O Type Definitions
I/O Type
I-SSTL2
O-SSTL2
HS_OUT
HS_IN
C
S
17
NOTE: VREFR ON EACH DEVICE MAY BE USED TO DRIVE VREFT ON THE OTHER DEVICE INSTEAD OF USING
THE CONFIGURATION ABOVE. VREFR SHOULD BE BYPASSED WITH 0.1 µF IN THIS CASE. IF USED, R1 + R2
SHOULD BE 500-1000 . 1% RESISTORS SHOULD BE USED FOR R1 AND R2. WHEN USING THE CONFIGURATION
ABOVE, VREFT TO THE MAC DEVICE SHOULD BE SET TO 1.25 V NOMINAL. USING THIS VALUE CENTERS VREFR
RELATIVE TO THE RX[0:9] OUTPUT SWINGS PROVIDED BY THE HDMP-2634.
HDMP-2634
RX[0:9]
VREFR
TX[0:9]
VREFT
V
CC
V
CC
Definition
Input SSTL_2. These inputs will receive LVTTL-compliant signals successfully.
Output SSTL_2. These outputs will not produce LVTTL-compliant signals.
High Speed Output, ECL Compatible
High Speed Input
External Circuit Node
Power Supply or Ground
(SERDES) = 3.3 V
DELIVER PROPER VOLTAGE SWINGS AT TX[0:9]
0.1 µF
USE TERMINATION, IF NECESSARY, TO
V
CC
V
(SERDES)
UNTERMINATED
CC
RS = 50
RS = 50
R1
R2
(MAC)
R1
R2
0.1 µF
2.5 V FOR SSTL_2
V
CC
(MAC) = 2.5 V
V
VDDQ
VREFT
DATAIN
DATAOUT
VREFR
CC
MAC