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SuperLiteTM Micrel, Inc.
D FLIP-FLOP
SY55852U SuperLiteTM SY55852U
FEATURES
s s s s s s s s s 2.5GHz min. fMAX 2.3V to 5.7V power supply Single bit register memory Synchronizes 1 bit of data to a clock Optimized to work with SuperLiteTM family Fully differential Accepts CML, PECL, LVPECL input logic levels Source terminated CML outputs for fast edge rates Available in a tiny 10-pin MSOP SuperLiteTM
DESCRIPTION
The SY55852U is a flip-flop used to synchronize data to a clock. Its differential output will reproduce and remember the value on its input at the rising edge of the clock. In addition, an asynchronous, level sensitive reset is provided. For a synchonous reset, the SY55851U AnyGateTM can be used. SY55852U inputs can be terminated with a single resistor between the true and complement pins of a given input. The SY55852U is a member of Micrel's SuperLiteTM family of high-speed CML logic. This family features very small packaging and 2.3V to 5.7V operation.
APPLICATIONS
s High-speed logic s OC-48 communication systems
FUNCTIONAL BLOCK DIAGRAM
DATA CLOCK
D
Q
OUT
R RESET
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.
SuperLiteTM SY55852U
PACKAGE/ORDERING INFORMATION
VCC /R 9 10 R 8 Q 7 /Q 6
Ordering Information(1)
Part Number Package Type K10-1 K10-1 K10-1 K10-1 K10-1 K10-1 Operating Range Commercial Commercial Industrial Industrial Industrial Industrial Package Marking 55852U 55852U 55852U 55852U Lead Finish Sn-Pb Sn-Pb Sn-Pb Sn-Pb
Top View MSOP
SY55852UKC SY55852UKCTR(2) SY55852UKI SY55852UKITR(2) SY55852UKG(3)
1 D
4 5 2 3 /D CLK /CLK GND
10-Pin MSOP (K10-1)
SY55852UKGTR(2, 3)
55852U with NiPdAu Pb-Free bar line indicator Pb-Free 55852U with NiPdAu Pb-Free bar line indicator 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 DESCRIPTION
Pin Number 1, 2 3, 4 5 6, 7 8, 9 10 Pin Name D, /D CLK, /CLK GND Q, /Q R, /R VCC Pin Function CML/PECL/LVPECL Input (Differential): This is the single bit of data that gets clocked in and remembered. CML/PECL/LVPECL Input (Differential): The rising edge of this signal is the clock signal that determines when the Boolean value at the data input gets stored. Ground. CML Output (Differential): This is the output of the flip-flop. CML/PECL/LVPECL Input (Differential): This is an asynchronous active high level reset, that forces the flip-flop into a known state, namely zero. Power Supply.
TRUTH TABLE
D X X X 0 1 CLK X 0 1 R 1 0 0 0 0 Q 0 QN-1 QN-1 0 1 /Q 1 /QN-1 /QN-1 1 0
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Micrel, Inc.
SuperLiteTM SY55852U
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. To keep an input at static logic zero at VCC > 3.0V, leave both inputs unconnected. For V CC 3.0V, connect the complement inputs to VCC and leave the true inputs unconnected. To make an input static logic one, connect the true input to V CC , leave the complement input unconnected. These are the only 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.
VCC NC
X /X
NC NC
X /X
Figure 1. Hard Wiring a Logic "1" (1)
Note 1. X is either D, CLK, R input. /X is either /D, /CLK, /R input.
VCC > 3.0V
NC VCC
X /X
VCC 3.0V
Figure 2. Hard Wiring a Logic "0" (1)
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Micrel, Inc.
SuperLiteTM SY55852U
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) .................................. -0.5V to +6.0V CML Output Voltage .......................... VCC -1.0 to VCC +0.5 Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature (TS) ....................... -65C to +150C
Operating Ratings(Note 2)
Supply Voltage (VIN) .............................. -0.5 to VCC +0.5V Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance MSOP (JA) Still-Air ........................................................... 113C/W 500lpfm ............................................................ 96C/W
Note 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 ratlng conditions for extended periods may affect device reliability. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Note 2.
DC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = +2.3V to +5.7V; GND = 0V; TA = -40C to +85C; unless otherwise noted. Symbol VCC ICC
Note 1.
Parameter Power Supply Voltage Power Supply Current
Condition
Min 2.3
Typ
Max 5.7 36
Units V mA
The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 500lfpm is maintained.
CML DC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = +2.3V to +5.7V; GND = 0V; TA = -40C to +85C; unless otherwise noted. 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 Note 2 Note 2 No Load No Load No Load, Note 3 50 Environment, Note 4 100 Environment, Note 5 Condition Min 100 1.6 1.5 -- -- VCC VCC - 0.1 VCC 0.950 Typ Max Units mV V V V V V V V
VCC - 0.020 VCC - 0.010 0.660 0.800 0.400 0.200 100
VCC - 0.97 VCC - 0.825 VCC - 0.660
RDRIVE
Note 1. Note 2. Note 3. Note 4. Note 5.
Output Source Impedance
Equilibrium temperature. Inputs must be biased to logic LOW or HIGH when VCC is less than 3.0V.
80
120
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. See Figure 3a and 3b. See Figure 4.
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55852U
AC ELECTRICAL CHARACTERISTICS(Note 1)
VCC = 2.3V to 5.7V; GND = 0V; TA = -40C to +85C; unless noted. Symbol fMAX tpd tS tH tRR tPW Parameter Max. Operating Frequency Propagation Delay Set-Up Time Hold Time Reset Recovery Minimum Pulse Width CLK to Q R to Q tr,tf
Note 1.
Condition
Min 2.5
Typ
Max
Units GHz
CLK to Q R to Q 40 40 400 VCC < 3V VCC 3V 160 140 250 35
400 500
ps ps ps ps ps
CML Output Rise/Fall Times (20% to 80%)
Tested using environment of Figure 3b, 50 load CML output.
150
ps
TIMING DIAGRAMS
CLK
tH
50% DATA
tS
50%
RESET
tRR
Q
50%
tpd
50%
tpd
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55852U
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. SY55852U expects the inputs to be terminated, and that good high
vcc vcc
speed design practices be adhered to. SY55852U 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.
vcc
100
100
100
100
50
100 100 100
100
50
50 100 50
50
50
8mA
8mA
SY55852U
SY55852U
Figure 3a. Differentially Terminated (50 Load CML Output)
VCC
Figure 3b. Individually Terminated (50 Load CML Output)
100
100
100 200 100
8mA
SY55852U
Figure 4.
100 Load CML Output
M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SuperLiteTM SY55852U
10-PIN MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-110705 hbwhelp@micrel.com or (408) 955-1690
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