SY55854UYY-TR [MICROCHIP]
2-CHANNEL, CROSS POINT SWITCH, PDSO16;
| 型号： | SY55854UYY-TR |
| 厂家： | 
MICROCHIP |
| 描述： | 2-CHANNEL, CROSS POINT SWITCH, PDSO16 光电二极管 输出元件 |
| 文件： | 总8页 (文件大小：250K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NOT RECOMMENDED FOR NEW DESIGNS
SY55854U
2 x 2 Protection Crosspoint Switch
General Description
The SY55854U is a fully differential, CML, 2 x 2-crosspoint
switch. The non-blocking design allows any input to be
connected to any output. Varying the state of the select
inputs allows SY55854U to be used in backup, fault
SuperLite®
Features
Guaranteed fMAX >2.5GHz over temperature
tolerant,
protection,
and
backplane
distribution
applications.
2.3V to 5.7V power supply
Non-blocking “switch architecture”
Guaranteed <15ps channel-to-channel skew
Guaranteed <480ps propagation delay over temperature
SY55854U inputs can be terminated with a single resistor
between the true and the complement pins of a given
input.
The SY55854U is a member of Micrel’s new SuperLite®
family of high-speed logic devices. This family features
very small packaging, high signal integrity, and flexible
supply voltage operation.
Configurable as 2:1 mux, 1:2 fan-out buffer, dual buffer,
or 2 x 2 switch
Accepts CML, PECL, LVPECL inputs
Fully differential inputs/outputs
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Source terminated CML outputs for fast edge rates
Wide operating temperature range: –40°C to +85°C
Available in a tiny 16-pin EPAD-QSOP package
Functional Block Diagram
Applications
High-speed logic
Data communications systems
Wireless communications systems
Telecom systems
Backplane redundancy
SuperLite is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
Micrel, Inc.
SY55854U
Ordering Information(1)
Part Number
Package
Type
Temperature
Range
Package
Lead
Finish
SY55854UYI
Y16-1
Y16-1
Y16-1
Industrial
Industrial
Industrial
854U
854U
Sn-Pb
Sn-Pb
SY55854UYITR(2)
SY55854UYY(3)
854U with
Pb-Free bar-line indicator
Matte-Sn
Pb-Free
SY55854UYYTR(2, 3)
Y16-1
Industrial
854U with
Pb-Free bar-line indicator
Matte-Sn
Pb-Free
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
Pin Configuration
16-Pin EPAD-QSOP (Y16-1)
Pin Description
Pin Number
Pin Name
Pin Function
2, 3
D0, /D0
CML/PECL/LVPECL Input (Differential). This is one of the data inputs to the crosspoint.
It will be switched either to the Q0 output, the Q1 output, both outputs, or neither output,
depending on the state of the S0 and S1 inputs.
4, 5
6, 7
S0, /S0
/D1, D1
CML/PECL/LVPECL Input (Differential). This selects input chooses which data input
switches to the Q0 output. S0 logic low selects the D0 input, while S0 logic high selects
the B input.
CML/PECL/LVPECL Input (Differential). This is the other data input to the crosspoint. It
will be switched either to the Q0 output, the Q1 output, both outputs, or neither output,
depending on the state of the S0 and S1 inputs.
1, 8
9, 16
10, 11
GND
VCC
Ground.
Power Supply.
Q1, /Q1
CML Output (Differential). This is the other output from the crosspoint. Input S1 selects
either the D0 or D1 input to be switched to this output.
12, 13
14, 15
/S1, S1
/Q0, Q0
CML/PECL/LVPECL Input (Differential). This select input chooses which data input
switches to the Q1 output. S1 logic low selects the D0 input, while S1 logic high selects
the D1 input.
CML Output (Differential). This is one output from the crosspoint. Input S0 selects either
the D0 or the D1 input to be switched to this output.
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
2
Micrel, Inc.
SY55854U
Functional Description
Usage
SY55854U is very versatile. Tying its select inputs in
various ways varies its functionality. For example, tying the
select inputs together turns SY55854U into a redundant
distributor. Either input will be switched to both outputs
simultaneously. This is very useful in redundant backplane
applications. By cross-tying the select inputs, SY55854U
becomes a true crosspoint, selecting between “straight
through” and “cross connected” operation. Also, using the
select inputs independently, SY55854U functions as two
multiplexers. Setting the select inputs to static values turns
SY55854U into a dual buffer, or a fan-out buffer.
Establishing Static Logic Inputs
The true pin of an input pair is internally biased to ground
through a 75kΩ resistor. The complement pin of an input
pair is internally biased halfway between VCC and ground
by a voltage divider consisting of two 75kΩ resistors. In
this way, unconnected inputs appear as logic zeros. To
keep an input at static logic zero at VCC > 3.0V, leave both
inputs unconnected. For VCC ≤ 3.0V, connect the
complement input to VCC and leave the true input
unconnected. To make an input static logic one, connect
the true input to VCC, and leave the complement input
unconnected. These are the only two safe ways to cause
inputs to be at a static value. In particular, no input pin
should be directly connected to ground. All NC (no
connect) pins should be unconnected.
To make larger crosspoints, cascade SY55854U devices,
either in a tree, or in a Banyan structure, as appropriate for
your application.
(1)
Figure 1. Hard Wiring a Logic “1”
Note:
1. X is either D0, D1, S0, or S1 input. /X is either /D0, /D1, /S0, or /S1
input.
(1)
Figure 2. Hard Wiring a Logic “0”
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
3
Micrel, Inc.
SY55854U
Truth Table
S0
0
S1
0
Q0
D0
Q1
D0
Function
Fan-Out Buffer
Dual Buffer
0
1
D0
D1
1
0
D1
D0
Dual Buffer
1
1
D1
D1
Fan-Out Buffer
Redundant Distribution
Crosspoint
CTL
CTL
CTL
/CTL
Same
Opposite
Same
Opposite
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
4
Micrel, Inc.
SY55854U
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VCC).......................................–0.5 to +6.0V
Input Voltage (VIN)....................................–0.5 to VCC +0.5V
Supply Voltage (VIN)........................................–0.5 to +6.0V
Ambient Temperature (TA) ..............................–40 to +85°C
CML Output Voltage (VOUT).............. VCC –1.0 to VCC +0.5V
Lead Temperature (soldering, 20sec.)....................... 260°C
Storage Temperature (Ts) .............................–65 to +150°C
DC Electrical Characteristics
VCC = 2.3V to 5.7V; GND = 0V; TA = –40°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
VCC
Power Supply Voltage
2.3
5.7
V
ICC
Power Supply Current
60
mA
CML DC Electrical Characteristics
(3)
VCC = 2.3V to 5.7V; GND = 0V; TA = –40°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
VID
Differential Input Voltage
100
mV
VIH
Input HIGH Voltage
Input LOW Voltage
Output HIGH Voltage
Output LOW Voltage
Output Voltage Swing(4)
1.6
1.5
VCC
VCC-0.1
VCC
V
V
V
V
VIL
VOH
VOL
VOS
No Load
No Load
VCC – 0.020
VCC – 0.97
0.700
VCC – 0.010
VCC – 0.825 VCC – 0.660
No Load
0.800
0.400
0.200
100
0.950
V
V
V
Ω
100Ω Environment(5)
50Ω Environment(6)
RDRIVE
Output Source Impedance
80
120
Notes:
1. 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 rating conditions for extended
periods may affect device reliability.
2. The device is not guaranteed to function outside its operating rating.
3. Equilibrium temperature.
4. Actual voltage levels and differential swing will depend on customer termination scheme. Typically, a 400mV swing is available in the 100Ω
environment and a 200mV swing in the 50Ω environment. Refer to the “CML Termination” diagram for more details
5. See Figure 4.
6. See Figure 3a and 3b.
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
5
Micrel, Inc.
SY55854U
AC Electrical Characteristics(8, 9)
VCC = 2.3V to 5.7V; GND = 0V; TA = –40°C to +85°C
Symbol
Parameter
Condition
Min
Typ
Max
Units
fMAX
Max. Operating Frequency
2.5
GHz
tPD
Propagation Delay,
400
mA
S0, S1, D0, D1 to Q0, Q1
Within-Device Skew(9)
Part-to-Part Skew (Diff.)
tSKEW
tr, tf
15
100
ps
CML Output Rise/Fall Times
(20% to 80%)
150
ps
Notes:
8. Tested using environment of Figure 3b, 50Ω load CML output.
9. Worst case difference between Q0 and Q1 from either A or B, when both outputs come from the same input.
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
6
Micrel, Inc.
SY55854U
CML Termination
All inputs accept the output from any other member of
this family. All outputs are source terminated 100Ω CML
differential drivers as shown in Figures 3 and 4.
SY55854U expects the inputs to be terminated, and that
good high speed design practices be adhered to.
SY55854U inputs are designed to accept a termination
resistor between the true and complement inputs of a
differential pair. 0402 form factor chip resistors will fit
with some trace fanout.
Figure 3b. Individually Terminated
(50Ω Load CML Output)
Figure 3a. Differentially Terminated
(50Ω Load CML Output)
Figure 4. 100Ω Load CML Output
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
7
Micrel, Inc.
SY55854U
Package Information
16-Pin EPAD-QSOP (Y16-1)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
M9999-102711-G
hbwhelp@micrel.com or (408) 955-1690
October 2011
8
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