SY55858U Datasheet, PDF (1/8 Pages) Micrel Semiconductor – 2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION

Micrel
2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML
CROSSPOINT SWITCH
W/INTERNAL TERMINATION
SuperLite™
Super^SL^Yit⁵e⁵™^858U
SY55858U
FEATURES
s Guaranteed AC parameters over temperature:
• f_MAX > 3.0GHz (3Gbps)
• t_r/ t_f < 120ps
• Within-device skew < 25ps
s Non-blocking “switch architecture”
s Configurable as dual 2:1 mux, dual 1:2 fanout buffer,
1:4 fanout buffer, quad buffer, or dual 2 x 2 switch
s 50Ω compatible outputs
s Unique input termination and V_T pin for DC-coupled
and AC-coupled input signals–CML or PECL
s Fully differential inputs/outputs
s TTL/CMOS compatible control logic
s Wide supply voltage range: 2.3V to 3.6V
s Wide operating temperature range: –40°C to +85°C
s Available in 32-pin EPAD-TQFP package
DESCRIPTION
SuperLite™
The SY55858U is a low-voltage, high-speed dual 2 x 2
crosspoint switch with a flexible input that accepts CML
or PECL, and a 50Ω compatible differential CML (current-
mode logic) output. The non-blocking design allows any
input to connect to any output. Varying the state of the
select inputs allows SY55858U to be used in backup,
fault tolerant, protection and backplane distribution
applications.
The signal inputs (DA_0–1 and DB_0–1) have a unique
internal termination design that allows access to the
termination network through V_T pins. This feature allows
the device to easily interface to other logic standards
such as AC-coupled or DC-coupled PECL/LVPECL
signals. For applications that require a single-channel
2 x 2 crosspoint, consider the SY55854.
PIN CONFIGURATION
DB1
VTB1
/DB1
SELB0
DB0
VTB0
/DB0
SELB1
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4
Top View
21
EPAD-TQFP
5
H32-1
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
GND
VCC
QA0
/QA0
VCC
QA1
/QA1
VCC
APPLICATIONS
s SONET/SDH optical transport
s Backplane redundancy
s Add-drop Multiplexers
SuperLite is a trademark of Micrel, Inc.
1
Rev.: C Amendment: /1
Issue Date: September2003