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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 tolerant, protection, and backplane distribution applications. 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(R) family of high-speed logic devices. This family features very small packaging, high signal integrity, and flexible supply voltage operation. Datasheets and support documentation can be found on Micrel's web site at: www.micrel.com.
SuperLite(R)
Features
* Guaranteed fMAX >2.5GHz over temperature * * * * * * * * * * 2.3V to 5.7V power supply Non-blocking "switch architecture" Guaranteed <15ps channel-to-channel skew Guaranteed <480ps propagation delay over temperature 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 Source terminated CML outputs for fast edge rates Wide operating temperature range: -40C to +85C 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
March 2007
M9999-032207-E hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY55854U
Ordering Information(1)
Part Number SY55854UYI SY55854UYITR(2) SY55854UYI(3) SY55854UYITR(2, 3) Package Type Y16-1 Y16-1 Y16-1 Y16-1 Temperature Range Industrial Industrial Industrial Industrial Package 854U 854U 854U with Pb-Free bar-line indicator 854U with Pb-Free bar-line indicator Lead Finish Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, 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 2, 3 Pin Name D0, /D0 Pin Function 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. 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. Ground. Power Supply. 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. 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.
4, 5
S0, /S0
6, 7
/D1, D1
1, 8 9, 16 10, 11 12, 13
GND VCC Q1, /Q1 /S1, S1
14, 15
/Q0, Q0
March 2007
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Micrel, Inc.
SY55854U 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. To make larger crosspoints, cascade SY55854U devices, either in a tree, or in a Banyan structure, as appropriate for your application.
Functional Description
Establishing Static Logic Inputs The true pin of an input pair is internally biased to ground through a 75k resistor. The complement pin of an input pair is internally biased halfway between VCC and ground by a voltage divider consisting of two 75k 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.
Figure 1. Hard Wiring a Logic "1" (1)
Note: 1. X is either D0, D1, S0, or S1 input. /X is either /D0, /D1, /S0, or /S1 input.
Figure 2. Hard Wiring a Logic "0" (1)
March 2007
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Micrel, Inc.
SY55854U
Truth Table
S0 0 0 1 1 CTL CTL S1 0 1 0 1 CTL /CTL Q0 D0 D0 D1 D1 Same Opposite Q1 D0 D1 D0 D1 Same Opposite Function Fan-Out Buffer Dual Buffer Dual Buffer Fan-Out Buffer Redundant Distribution Crosspoint
March 2007
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M9999-032207-E hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY55854U
Absolute Maximum Ratings(1)
Supply Voltage (VCC).......................................-0.5 to +6.0V Input Voltage (VIN) ....................................-0.5 to VCC +0.5V CML Output Voltage (VOUT).............. VCC -1.0 to VCC +0.5V Lead Temperature (soldering, 20sec.)....................... 260C Storage Temperature (Ts) ............................. -65 to +150C
Operating Ratings(2)
Supply Voltage (VIN)........................................-0.5 to +6.0V Ambient Temperature (TA) .............................. -40 to +85C
DC Electrical Characteristics
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C
Symbol VCC ICC Parameter Power Supply Voltage Power Supply Current Condition Min 2.3 Typ Max 5.7 60 Units V mA
CML DC Electrical Characteristics
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C(3)
Symbol VID VIH VIL VOH VOL VOS Parameter Differential Input Voltage Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Output LOW Voltage Output Voltage Swing(4) No Load No Load No Load 100 RDRIVE
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 100 environment and a 200mV swing in the 50 environment. Refer to the "CML Termination" diagram for more details 5. See Figure 4. 6. See Figure 3a and 3b.
Condition
Min 100 1.6 1.5 VCC - 0.020 VCC - 0.97 0.700
Typ
Max VCC VCC-0.1
Units mV V V V V V V V
VCC - 0.010 VCC - 0.825 0.800 0.400 0.200
VCC VCC - 0.660 0.950
Environment(5) 80
50 Environment(6) Output Source Impedance
100
120
March 2007
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Micrel, Inc.
SY55854U
AC Electrical Characteristics(8, 9)
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C
Symbol fMAX tPD tSKEW tr, tf
Notes: 8. Tested using environment of Figure 3b, 50 load CML output. 9. Worst case difference between Q0 and Q1 from either A or B, when both outputs come from the same input.
Parameter Max. Operating Frequency Propagation Delay, S0, S1, D0, D1 to Q0, Q1 Within-Device Skew(9) Part-to-Part Skew (Diff.) CML Output Rise/Fall Times (20% to 80%)
Condition
Min 2.5
Typ
Max 400 15 100 150
Units V mA ps ps
March 2007
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Micrel, Inc.
SY55854U
CML Termination
All inputs accept the output from any other member of this family. All outputs are source terminated 100 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 (50 Load CML Output)
Figure 3a. Differentially Terminated (50 Load CML Output)
Figure 4. 100 Load CML Output
March 2007
7
M9999-032207-E hbwhelp@micrel.com or (408) 955-1690
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. (c) 2006 Micrel, Incorporated.
March 2007
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M9999-032207-E hbwhelp@micrel.com or (408) 955-1690

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