Micrel, Inc.
2.5V/3.3V 3.0GH
Z
DUAL 2 x 2 CML
CROSSPOINT SWITCH
W
/INTERNAL TERMINATION
SuperLite™
SY55858U
SuperLite™
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
50
Ω
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
SuperLite™
DESCRIPTION
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.
APPLICATIONS
s
SONET/SDH optical transport
s
Backplane redundancy
s
Add-drop Multiplexers
SuperLite is a trademark of Micrel, Inc.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
Rev.: D
Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
SuperLite™
SY55858U
PACKAGE/ORDERING INFORMATION
SELA0
SELA1
VTA1
VTA0
/DA0
/DA1
DA1
DA0
Ordering Information
(1)
GND
VCC
QA0
/QA0
VCC
QA1
/QA1
VCC
DB1
VTB1
/DB1
SELB0
DB0
VTB0
/DB0
SELB1
32 31 30 29 28 27 26 25
24
1
2
3
4
5
6
7
8
23
Part Number
SY55858UHI
SY55858UHITR
(2)
SY55858UHG
(3)
SY55858UHGTR
(2, 3)
Package
Type
H32-1
H32-1
H32-1
H32-1
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package
Marking
SY55858UHI
SY55858UHI
Lead
Finish
Sn-Pb
Sn-Pb
Top View
EPAD-TQFP
H32-1
22
21
20
19
18
SY55858UHG with
Pb-Free
Pb-Free bar-line indicator NiPdAu
SY55858UHG with
Pb-Free
Pb-Free bar-line indicator NiPdAu
17
9 10 11 12 13 14 15 16
/QB0
/QB1
QB0
GND
VCC
QB1
VCC
VCC
32-Pin EPAD-TQFP (H321)
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
TRUTH TABLES
SELA0
0
0
1
1
SELA1
0
1
0
1
QA0
DA0
DA0
DA1
DA1
QA1
DA0
DA1
DA0
DA1
Function
Fanout Buffer or Redundant Distribution
Dual Buffer or Crosspoint
Dual Buffer or Crosspoint
Fanout Buffer or Redundant Distribution
Table 1. Input to Output Connectivity Crosspoint A
SELB0
0
0
1
1
SELB1
0
1
0
1
QB0
DB0
DB0
DB1
DB1
QB1
DB0
DB1
DB0
DB1
Function
Fanout Buffer or Redundant Distribution
Dual Buffer or Crosspoint
Dual Buffer or Crosspoint
Fanout Buffer or Redundant Distribution
Table 2. Input to Output Connectivity Crosspoint B
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SuperLite™
SY55858U
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
9, 24
10, 13, 16, 17, 20, 23
11
12
14
15
18
19
21
22
25
26
27
28
29
30
31
32
Pin Name
DB1
VTB1
/DB1
SELB0
DB0
VTB0
/DB0
SELB1
GND
VCC
/QB0
QB0
/QB1
QB1
/QA1
QA1
/QA0
QA0
DA0
VTA0
/DA0
SELA1
DA1
VTA1
/DA1
SELA0
Pin Function
Channel B1 posititve signal input.
Channel B1 termination center-tap. For CML inputs, leave this pin floating.
Otherwise, see Figures 5a–5d in “Input Interface Application” section.
Channel B1 negative signal input.
Channel B0 output select. TTL/CMOS input.
Channel B0 positive signal input.
Channel B0 termination center-tap. For CML inputs, leave this pin floating.
Otherwise, see Figures 5a–5d in “Input Interface Application” section.
Channel B0 negative signal input.
Channel B1 output select. TTL/CMOS input.
Supply Ground.
Positive supply normally connect to 2.5V, 3.3V, or 5V nominal supply, and
bypass each pin with 0.1µF//0.01µF low ESR capacitors.
Channel B0 negative signal output. 50Ω CML.
Channel B0 positive signal output. 50Ω CML.
Channel B1 negative signal output. 50Ω CML.
Channel B1 positive signal output. 50Ω CML.
Channel A1 negative signal output. 50Ω CML.
Channel A1 positive signal output. 50Ω CML.
Channel A0 negative signal output. 50Ω CML.
Channel A0 positive signal output. 50Ω CML.
Channel A0 positive signal input.
Channel A0 termination center-tap. For CML inputs, leave this pin floating.
Otherwise, see Figures 5a–5d in “Input Interface Application” section.
Channel A0 negative signal input.
Channel A1 output select. TTL/CMOS input.
Channel A1 positive signal input.
Channel A1 termination center-tap. For CML inputs, leave this pin floating.
Otherwise, see Figures 5a–5d in “Input Interface Application” section.
Channel A1 negative signal input.
Channel A1 output select. TTL/CMOS input.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SuperLite™
SY55858U
FUNCTIONAL BLOCK DIAGRAM
DA0
V
TA0
/DA0
SELA0
DA1
V
TA1
/DA1
SELA1
50Ω
50Ω
50Ω
50Ω
0
A0
1
CML
QA0
/QA0
0
A1
1
QA1
CML
/QA1
DB0
V
TB0
/DB0
SELB0
DB1
V
TB1
/DB1
SELB1
50Ω
50Ω
50Ω
50Ω
0
B0
1
CML
QB0
/QB0
0
B1
1
QB1
CML
/QB1
INPUT AND OUTPUT STAGE
V
CC
v
cc
D0
50Ω
1.2mA
V
T
*
50Ω
/D0
1.2mA
SY55858U
50Ω
50Ω
Q
/Q
16mA
SY55858U
Figure 1. Input Stage
Figure 2. Output Stage
Note 1.
See “Input Interface Applications” section for proper input
connection.
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
4
Micrel
SuperLite™
SY55858U
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
IN
V
OUT
T
A
T
LEAD
T
store
θ
JA
θ
JC
Note 1.
Rating
Power Supply Voltage
Input Voltage
CML Output Voltage
Operating Temperature Range
Lead Temperature (soldering, 20sec.)
Storage Temperature Range
Package Thermal Resistance
(Junction-to-Ambient)
Package Thermal Resistance
(Junction-to-Case)
–Still-Air (multi-layer PCB)
–500lfpm (multi-layer PCB)
Value
–0.5 to +6.0
–0.5 to V
CC
+0.5
V
CC
–1.0 to V
CC
+0.5
–40 to +85
260
–65 to +150
28
20
4
Unit
V
V
V
°C
°C
°C
°C/W
°C/W
°C/W
Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions
for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
Symbol
V
CC
I
CC
Parameter
Power Supply Voltage
Power Supply Current
Min.
2.3
—
Typ.
—
150
Max.
3.6
190
Unit
V
mA
No load, over temp.
Condition
TTL CONTROL ELECTRICAL CHARACTERISTICS
V
CC
= 2.3V to 3.6V; GND = 0V; T
A
= –40°C to +85°C
(2)
Symbol
V
IH
V
IL
I
IH
I
IL
Note 2.
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Min.
2.0
—
—
—
–300
Typ.
—
—
—
—
—
Max.
—
0.8
+20
+100
—
Unit
V
V
µA
µA
µA
Condition
V
IN
= 2.7V, V
CC
= Max.
V
IN
= V
CC
, V
CC
= Max.
V
IN
= 0.5V, V
CC
= Max.
Specifications are guaranteed after thermal equilibrium has been establised.
5
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