PDF EL2252C Data sheet ( Hoja de datos )

Número de pieza	EL2252C
Descripción	Dual 50 MHz Comparator/Pin Receiver
Fabricantes	Elantec Semiconductor
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No Preview Available ! 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 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 a75 C 0 C to a75 C Package 14-Pin P-DIP 20-Lead SOL Outline MDP0031 MDP0027 General Description The EL2252 dual comparator replaces the traditional input buffer a attenuator aECL comparator aECL to TTL transla- tor circuit blocks used in digital equipment The EL2252 pro- vides a quick 7 ns propagation delay while complying with g10V inputs Input accuracy and propagation delay is main- tained even with input signal Slew Rates as great as 4000 V ms The EL2252 can run on supplies as low as b5 2V and a9V 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 stabili- ty in the presence of input noise an internal 60 mV of hystere- sis is available by connecting the HYS pin to Vb 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’’ Connection Diagrams 14-Pin DIP 20-Pin SOL Top View 2252 – 1 Top View 2252 – 2 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 1 page 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 Input Output Transfer Function HYS Open Input Output Transfer Function HYS Connected to V 2252 – 5 2252 – 6 5 2252 – 7 5 Page EL2252C Dual 50 MHz Comparator Pin Receiver EL2252C Macromodel Connections subckt M2252 ainput l binput l l aV l l l bV l l l l HYS l l l l l TTL l l l l l l output l l l l l ll 2 3 14 7 4 5 13 Application Hints 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 itl1e200 itl2e200 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 11 Page

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