MAX3785_08 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 6.25Gbps, 1.8V PC Board Equalizer

19-2630; Rev 4; 10/08
6.25Gbps, 1.8V PC Board Equalizer
General Description
The MAX3785 6.25Gbps equalizer operates from a sin-
gle 1.8V supply and compensates for transmission-
medium losses encountered with FR-4 transmission
lines. Optimized for low-voltage, high-density, DC-cou-
pled interconnections between the line card and switch
card, the MAX3785 enables a system upgrade path
while maintaining a legacy rate of 2.5Gbps to
3.125Gbps. Roughly the size of two 0603 passive com-
ponents, the MAX3785 easily provides placement and
routing flexibility.
The MAX3785 is composed of an equalizer, limiting
amplifier, and output driver. For data rates of 3.2Gbps
and lower, the MAX3785 equalizes signals for spans up
to 40in of FR-4 board material. For data rates up to
6.25Gbps, the MAX3785 compensates for 30in of FR-4
board material. The MAX3785 is coding independent,
functioning equally well for 8b/10b or scrambled signals.
The MAX3785 features DC-coupled current-mode logic
(CML) data inputs and outputs. It is packaged in a tiny
1.5mm × 1.5mm chip-scale package (USCP™) and a
6-pin TDFN package.
Applications
HSBI for ≤ 6.4Gbps
Double IEEE 802.3ae XAUI
Double STM-16/OC-48
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
♦ Single 1.8V Supply
♦ Very Low Power, 60mW
♦ Spans 30in with FR-4 at 6.25Gbps
♦ Operates from 1.0Gbps to 6.4Gbps
♦ Coding Independent, 8b/10b or Scrambled
♦ DC-Coupled CML Inputs and Outputs
♦ Small 1.5mm × 1.5mm Footprint
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3785UBL
0°C to +85°C
6 UCSP (3
3)
MAX3785UWL+
0°C to +85°C
6 WLP
MAX3785UTT
0°C to +85°C
6 TDFN-EP*
MAX3785UTT+
0°C to +85°C
6 TDFN-EP*
MAX3785ITT
-20°C to +85°C
6 TDFN-EP*
MAX3785ITT+
-20°C to +85°C
6 TDFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configurations
TOP VIEW (BUMPS ON BOTTOM OF DIE)
Δ
A1
IN-
A2 A3
GND OUT-
MAX3785UBL
C1 C2 C3
IN+ V_CC OUT+
3 x 3 UCSP
IN- 1
6 IN+
GND 2 ^MAX3785UTT 5 V_CC
OUT- 3
TDFN
4 OUT+
Typical Application Circuit
LINE CARD
BACKPLANE
SWITCH CARD
MAC
Rx
Tx
Tx
Rx
1.8V
V_CC
OUT
IN
MAX3785
6.25Gbps
1.8V
V_CC
IN
OUT
MAX3785
30in (0.75m)
SWITCH
ASIC WITH
SERDES
Rx
Tx
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.