SuperLite™ SY55853U SuperLite™ Micrel, Inc. D LATCH SY55853U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ 2.5GHz min fmax 2.3V to 5.7V power supply Single bit latch Stores or flows through 1 bit of data Optimized to work with SuperLite™ family Fully differential Source terminated CML outputs for fast edge rates Accepts CML, PECL, LVPECL input logic levels Available in a tiny 10-pin MSOP SuperLite™ DESCRIPTION The SY55853U is a latch. Its differential output will flow through the input while it's enable is high. The output will remain static while the enable is low. In addition, an asynchronous, level sensitive reset is provided. SY55853U inputs can be terminated with a single resistor between the true and the complement pins of a given input. The SY55853U is a member of Micrel's SuperLite™ family of high-speed CML logic. This family features very small packaging and 2.3V to 5.7V operation. FUNCTIONAL BLOCK DIAGRAM APPLICATIONS ■ High-speed logic ■ OC-48 communication systems DATA LATCH ENABLE D Q OUT LE R RESET SuperLite is a trademark of Micrel, Inc. M9999-110705 [email protected] or (408) 955-1690 Rev.: C 1 Amendment: /0 Issue Date: November 2005 SuperLite™ SY55853U Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information(1) D 1 10 VCC /D 2 9 /R LE 3 8 R MSOP /LE 4 7 Q GND 5 6 /Q 10-Pin MSOP (K10-1) Part Number Package Type Operating Range Package Marking Lead Finish SY55853UKC K10-1 Commercial 55853U Sn-Pb SY55853UKCTR(2) K10-1 Commercial 55853U Sn-Pb SY55853UKI K10-1 Industrial 55853U Sn-Pb SY55853UKITR(2) K10-1 Industrial 55853U Sn-Pb SY55853UKG(3) K10-1 Industrial 55853U with NiPdAu Pb-Free bar line indicator Pb-Free SY55853UKGTR(2, 3) K10-1 Industrial 55853U with NiPdAu Pb-Free bar line indicator 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 DESCRIPTION Pin Number Pin Name Pin Function 1, 2 D, /D CML/PECL/LVPECL Input (Differential): This is the single bit of data that gets clocked in and remembered. 3, 4 LE, /LE CML/PECL/LVPECL Latch Enable Input (Differential): The rising edge of this signal is the clock signal that determines when the Boolean value at the data input gets stored. 5 GND 6, 7 Q, /Q CML Output (Differential): This is the output of the flip-flop. 8, 9 R, /R CML/PECL/LVPECL Reset Input (Differential): This is an asynchronous active high level reset, that forces the flip-flop into a known state, namely zero. 10 VCC Power Supply. Ground. TRUTH TABLE D LE R Q /Q Latched(1) X 0 0 Latched(1) 0 1 0 0 1 1 1 0 1 0 X X 1 0 1 Note 1. Retains data before LE falling transition. M9999-110705 [email protected] or (408) 955-1690 2 SuperLite™ SY55853U Micrel, Inc. FUNCTIONAL DESCRIPTION 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. To keep an input at static logic zero at VCC > 3.0V, leave both inputs unconnected. For V CC ≤ 3.0V, connect the complement input to V CC and leave the true input 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 X NC X NC /X NC /X VCC > 3.0V Figure 1. Hard Wiring A Logic “1” (1) Note 1. X is either D, LE, R input. /X is either /D, /LE, /R input. NC X VCC /X VCC ≤ 3.0V Figure 2. Hard Wiring A Logic “0” (1) M9999-110705 [email protected] or (408) 955-1690 3 SuperLite™ SY55853U Micrel, Inc. Absolute Maximum Ratings(Note 1) Operating Ratings(Note 2) Supply Voltage (VCC) .................................. –0.5V to +6.0V CML Output Voltage .......................... VCC –1.0 to VCC +0.5 Lead Temperature (soldering, 20 sec.) ..................... 260°C Storage Temperature (TS) ....................... –65°C to +150°C Supply Voltage (VIN) .............................. –0.5 to VCC +0.5V Ambient Temperature (TA) ......................... –40°C to +85°C Package Thermal Resistance MSOP (θJA) Still-Air ........................................................... 113°C/W 500lpfm ............................................................ 96°C/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. Note 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. DC ELECTRICAL CHARACTERISTICS(Note 1) VCC = 2.3V to 5.7V; GND = 0V; TA = –40°C to +85°C; unless noted. Symbol Parameter VCC Power Supply Voltage ICC Power Supply Current Note 1. Condition Min Typ 2.3 Max Units 5.7 V 37 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 = –40°C to +85°C; unless noted. Symbol Parameter Condition Min Typ Max VID Differential Input Voltage VIH Input HIGH Voltage Note 2 VIL Input LOW Voltage Note 2 VOH Output HIGH Voltage No Load VCC – 0.020 VCC – 0.010 VOL Output LOW Voltage No Load VOS Output Voltage Swing No Load, Note 3 100Ω Environment, Note 4 50Ω Environment, Note 5 VCC – 0.97 VCC – 0.825 VCC – 0.660 0.660 0.800 0.950 0.400 0.200 RDRIVE Output Source Impedance 100 Units mV 1.6 — VCC V 1.5 — VCC – 0.1 V VCC V 80 100 120 V V Ω Note 1. 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. Note 2. Inputs must be biased to logic LOW or HIGH when VCC is less than 3.0V. Note 3. 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. Note 4. See Figure 4. Note 5. See Figure 3a and 3b. M9999-110705 [email protected] or (408) 955-1690 4 SuperLite™ SY55853U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(Note 1) VCC = 2.3V to 5.7V; GND = 0V; TA = –40°C to +85°C; unless noted. Symbol Parameter fMAX Max. Operating Frequency tpd Propagation Delay D to Q LE to Q R to Q tS Set-Up Time D to LE D to R 70 ps tH Hold Time LE to D 40 ps tRR Reset Recovery 400 ps tPW Minimum Pulse Width 160 250 ps t r, t f CML Output Rise/Fall Times (20% to 80%) Note 1. Condition Min LE High R High –40°C to 0°C 0°C to 85°C 35 CLK tH 50% 50% DATA tS tRR RESET 50% tpd 50% tpd 5 Units GHz 400 400 500 TIMING DIAGRAMS M9999-110705 [email protected] or (408) 955-1690 Max 2.5 Tested using environment of Figure 3b, 50Ω load CML output. Q Typ 175 160 ps ps ps ps SuperLite™ SY55853U Micrel, Inc. 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. SY55853U expects the inputs to be terminated, and that good high vcc 100Ω speed design practices be adhered to. SY55853U 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 vcc 100Ω 100Ω 100Ω 50Ω 100Ω 100Ω 100Ω 50Ω 100Ω 100Ω 50Ω 50Ω 50Ω 8mA 8mA SY55853U SY55853U Figure 3a. Differentially Terminated (50Ω Load CML Output) Figure 3b. Individually Terminated (50Ω Load CML Output) VCC 100Ω 100Ω 100Ω 200Ω 100Ω 8mA SY55853U Figure 4. M9999-110705 [email protected] or (408) 955-1690 100Ω Load CML Output 6 50Ω SuperLite™ SY55853U Micrel, Inc. 10-PIN MSOP (K10-1) Rev. 00 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA 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. © 2005 Micrel, Incorporated. M9999-110705 [email protected] or (408) 955-1690 7