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| EL2252C EL2252C Dual 50 MHz Comparator Pin Receiver Features Fast response 7 ns Inputs tolerate large overdrives with no speed nor bias current penalties Propagation delay is relatively constant with variations of input Slew Rate overdrive temperature and supply voltage Output provides proper CMOS or TTL logic levels Hysteresis is available on-chip Large voltage gain 8000 V V Not oscillation-prone Can detect 4 ns glitches MIL-STD-883 Rev C compliant General Description The EL2252 dual comparator replaces the traditional input buffer a attenuator a ECL comparator a ECL to TTL translator circuit blocks used in digital equipment The EL2252 provides a quick 7 ns propagation delay while complying with g10V inputs Input accuracy and propagation delay is maintained even with input signal Slew Rates as great as 4000 V ms The EL2252 can run on supplies as low as b 5 2V and a 9V and comply with ECL and CMOS inputs or use supplies as great as g18V for much greater input range The EL2252 has a TTL pin which when grounded restricts the output VOH to a TTL swing to minimize propagation delay When left open the output VOH increases to a valid CMOS level The comparators are well behaved and have little tendency to oscillate over a variety of input and output source and load impedances They do not oscillate even when the inputs are held in the linear range of the device To improve output stability in the presence of input noise an internal 60 mV of hysteresis is available by connecting the HYS pin to V b Elantec's products and facilities comply with MIL-I-45208A and other applicable quality specifications For information on Elantec's processing see Elantec document QRA-1 ``Elantec's Processing Monolithic Integrated Circuits'' Applications Pin receiver for automatic test equipment Data communications line receiver Frequency counter input Pulse squarer Ordering Information Part No EL2252CN EL2252CM Temp Range 0 C to a 75 C 0 C to a 75 C Package 14-Pin P-DIP 20-Lead SOL Outline MDP0031 MDP0027 Connection Diagrams 14-Pin DIP 20-Pin SOL December 1995 Rev E 2252 - 1 Top View 2252 - 2 Top View Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ``controlled document'' Current revisions if any to these specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation Patent pending 1995 Elantec Inc EL2252C Dual 50 MHz Comparator Pin Receiver Absolute Maximum Ratings (TA e 25 C) Voltage between V a and Vb Voltage at V a Voltage between bIN and a IN pins Output Current Current into a IN bIN HYS or TTL 36V 18V 36V 12 mA 5 mA Internal Power Dissipation Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range See Curves b 25 C to a 85 C 150 C b 65 to a 150C Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore TJ e TC e TA Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX0002 100% production tested at TA e 25 C and QA sample tested at TA e 25 C TMAX and TMIN per QA test plan QCX0002 QA sample tested per QA test plan QCX0002 Parameter is guaranteed (but not tested) by Design and Characterization Data Parameter is typical value at TA e 25 C for information purposes only DC Electrical Characteristics VS e g15V Parameter VOS Description Input Offset Voltage Temp 25 C Full TCVOS IB Average Offset Voltage Drift Input Bias Current at Null Full 25 C Full IOS Input Offset Current 25 C Full RIN diff RIN comm CIN VCM a VCMb AVOL Input Differential Resistance Input Common-Mode Resistance Input Capacitance Positive Common-Mode Input Range Negative Common-Mode Input Range Large Signal Voltage Gain VO e 0 8V to 2 0V 25 C 25 C 25 C Full Full 25 C Full HYS and TTL grounded TA e 25 C unless otherwise specified Min Typ 1 Max 9 13 7 6 16 21 02 1 2 30 10 2 10 b9 Test Level EL2252C I III V I III I III V V V II II I III Units mV mV mV C mA mA mA mA kX MX pF V V VV VV TD is 3 3in 13 b 12 4000 3000 8000 2 EL2252C Dual 50 MHz Comparator Pin Receiver DC Electrical Characteristics VS e g15V HYS and TTL grounded TA e 25 C unless otherwise specified Parameter CMRR PSRR VHYS VOH Description Common-Mode Rejection Ratio (Note 1) Power-Supply Rejection Ratio (Note 2) Peak-to-Peak Input Hysteresis with HYS connected to Vb High Level Output CMOS Mode TTL Mode VOL Low Level Output I1 e 0 I1 e 5 mA IS a ISb Positive Supply Current Negative Supply Current Temp Min Contd Typ Max Test Level EL2252C Units Full Full 25 C Full Full Full Full Full Full 70 70 95 90 60 II II V 51 32 08 08 19 20 II II II II II II dB dB mV V V V TD is 2 5in TD is 2 2in V mA mA 40 24 b0 2 b0 2 46 27 02 04 16 17 AC Electrical Characteristics VS e g15V CL e 10 pF TA e 25 C TTL output threshold is 1 4V CMOS output threshold is 2 5V unless otherwise specified Parameter TPD a TPDb Description Input to Output Propagation Delay 0 k VIN k 5V 500 mV Overdrive 2000 V ms Input Slew Rate TTL Output Swing CMOS Output Swing TPD a TPDb Input to Output Propagation Delay b 2V k VIN k b 1V 500 mV Overdrive 2 ns Input Rise Time TTL Output Swing CMOS Output Swing TPDSYM Propagation Delay Change between Positive and Negative Input Slopes Min Typ Max Test Level EL2252C Units 6 9 III ns 8 V ns 5 9 III ns 9 1 25 V V ns ns Note 1 Two tests are performed with VCM e 0V to b9V and VCM e 0V to 10V Note 2 Two tests are performed with V a e 15V Vb changed from b10V to b15V Vb e b15V V a changed from 10V to 15V 3 EL2252C Dual 50 MHz Comparator Pin Receiver AC Test Circuit 2252 - 3 Burn-In Circuit 2252 - 4 4 EL2252C Dual 50 MHz Comparator Pin Receiver Typical Performance Curves Input Bias Current vs Small Overdrives Input Bias Current vs Large Overdrives Bias Current vs Temperature Inputs Balanced Input Hysteresis Voltage vs Temperature 2252 - 5 Input Output Transfer Function HYS Open Input Output Transfer Function HYS Connected to V 2252 - 6 2252 - 7 5 EL2252C Dual 50 MHz Comparator Pin Receiver Typical Performance Curves Supply Current vs Supply Voltage Contd Supply Current vs Temperature (VS e g15V) 2252 - 8 Output Delay 0 5V Overdrive Output Delay 0 5V Overdrive 2252 - 10 2252 - 9 Output with 50 MHz CMOS Input Output with 50 MHz ECL Input 2252 - 11 2252 - 12 6 EL2252C Dual 50 MHz Comparator Pin Receiver Typical Performance Curves Contd 4 ns TTL Glitch Detection 2252 - 13 Gain vs Frequency Propagation Delay vs Temperature CMOS Input Propagation Delay vs Temperature ECL Input Propagation Delay vs Overdrive CMOS Input Propagation Delay vs Input Slew Rate CMOS Input 2252 - 14 7 EL2252C Dual 50 MHz Comparator Pin Receiver Typical Performance Curves Propagation Delay vs Power Supply Voltage Contd Propagation Delay vs Load Capacitance 2252 - 15 14-Lead Plastic DIP Maximum Power Dissipation vs Ambient Temperature 20-Lead SOL Maximum Power Dissipation vs Ambient Temperature 2252 - 16 2252 - 18 8 EL2252C Dual 50 MHz Comparator Pin Receiver Simplified Schematic One Comparator 2252 - 19 Applications Information The EL2252 is very easy to use and is relatively oscillation-free but a few items must be attended The first is that both supplies should be bypassed closely 1 mF tantalums are very good and no additional smaller capacitors are necessary The EL2252 requires V b to be at least 5V to preserve AC performance V a must be at least 6V for a TTL output swing 8V for CMOS outputs The input voltage range will be referred to the more positive of the two inputs That is bringing an input as negative as V b will not cause problems it's the other input's level that must be considered The typical input range is a 13 b 12V when the supplies are g15V This range diminishes over temperature and varies with processing it is wise to set power supplies such that V a is 5V more positive than the most positive input signal and V b more negative than 6V below the most negative input g12V supplies will easily encompass all CMOS and ECL logic inputs If the input exceeds the device's common-mode input capability the EL2252 propagation delay and input bias current will increase Fault currents will occur with inputs a diode below V b or above V a No damage nor VOS shift will occur even when fault currents within the absolute maximum ratings 9 EL2252C Dual 50 MHz Comparator Pin Receiver Applications Information Contd One of the few ways in which oscillations can be induced is by connecting a high-Q reactive source impedance to the EL2252 inputs Such sources are long wires and unterminated coaxial lines The source impedance should be de-Q'ed One method is to connect a series resistor to the EL2252 input of around 100X value More resistance will calm the system more effectively but at the expense of comparator response time Another method is to install a ``snubber'' network from comparator input to ground A snubber is a resistor in series with a small capacitor around 100X and 33 pF Each physical and electrical environment will require different treatments although many need none teresis are increased The relationship between the resistor and resulting hysteresis level is not linear but a 1 5k resistor will approximately halve the nominal value The time delay of the EL2252 will increase by about 0 7 ns when using full hysteresis The EL2252 is specifically designed to be tolerent of large inputs It will exhibit very much increased delay times for input overdrives below 100 mV If very small overdrives must be sensed the EL2018 or EL2019 comparators would be good choices although they lose accuracies with signal input Slew Rates above 400 V ms The EL2252 keeps its timing accuracy with input Slew Rates between 100 V ms and 4000 V ms of input Slew Rate The output stage drives tens of pF load capacitances without increased overshoot but propagation delay increases about 1 ns per 10 pF The output circuit is not a traditional TTL stage and using an external pullup resistor will not change the VOH In general setting the output swing to TTL (by grounding the TTL pin) will optimize overall propagation delay and gswing symmetry The major use of the HYS pin is to suppress noise superimposed on the input signal By shorting the HYS pin to V b a g30 mV hysteresis is placed around the VOS of the comparator input Leaving the pin open or more appropriately grounding the HYS pin removes all hysteresis Connecting a resistor between HYS and V b allows an adjustment of the peak-to-peak hysteresis level Unfortunately an external resistor cannot track the internal devices properly so temperature and unit-to-unit variations of hys- 10 EL2252C Dual 50 MHz Comparator Pin Receiver EL2252C Macromodel Connections a input l l l l l l l subckt M2252 2 Application Hints b input l l l l l l 3 aV l l l l l 14 bV l l l l 7 HYS l l l 4 TTL l l 5 output l 13 Connect pin 4 to ground through 1000 MX resistor to inhibit Hysteresis to invoke Hysteresis connect pin 4 to Vb Connect pin 5 to ground to invoke TTL VOH pin 5 may left open for CMOS VOH To facilitate OP set itl1 e 200 itl2 e 200 set node 27 to 13 8V and node 30 to b12V Input Stage i1 22 7 1 7mA r1 14 20 300 r2 14 21 300 q1 20 2 22 qn q2 21 3 22 qn q3 20 26 23 qn q4 21 25 23 qn q13 25 27 20 qp q14 26 27 21 qp v1 14 27 1 2V r3 23 24 1 4k d1 24 4 ds r4 25 33 700 r5 26 33 700 q16 33 33 34 qn q17 34 34 37 qn v4 37 7 1 2V 2nd Stage i2 30 7 3mA i3 14 28 1 5mA q7 0 35 28 qp v2 44 0 1 2V s1 44 35 5 0 swa s2 45 35 5 0 swb rsw 14 5 10k 11 TD is 6 7in EL2252C EL2252C Dual 50 MHz Comparator Pin Receiver EL2252C Macromodel v3 45 0 2 5V q5 0 26 30 qn q6 28 25 30 qn d3 0 28 ds Output Stage i4 14 38 1mA q8 38 38 39 qn q9 32 32 39 qp q10 7 28 32 qp q11 14 38 40 qn 2 q12 7 28 13 qp 2 r6 40 13 50 c1 28 0 3pF Models model qn npn (is e 2eb15 bf e 120 tf e 0 2nS cje e 0 2pF cjc e 0 2pF ccs e 0 2pF) model qp pnp (is e 0 6eb15 bf e 60 tf e 0 2nS cje e 0 5pF cjc e 0 3pF ccs e 0 2pF) model ds d(is e 3eb12 tt e 0 05nS eg e 0 72V vj e 0 58) model swa vswitch (von e 0v voff e 2 5V) model swb vswitch (von e 2 5 voff e 0V) ends Contd General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement WARNING Life Support Policy December 1995 Rev E Elantec Inc 1996 Tarob Court Milpitas CA 95035 Telephone (408) 945-1323 (800) 333-6314 Fax (408) 945-9305 European Office 44-71-482-4596 12 Elantec Inc products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec Inc Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death Users contemplating application of Elantec Inc products in Life Support Systems are requested to contact Elantec Inc factory headquarters to establish suitable terms conditions for these applications Elantec Inc 's warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages Printed in U S A TD is 3 1in |
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