Bourns Emitter Coupled Logic Terminator Series Typical Applicatio

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Bourns Emitter Coupled Logic Terminator Series Typical Applicatio

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Bourns Emitter Coupled Logic Terminator Series
Typical Application typical application using Bourns Network conjunction with design shown below. typically connected -5.2 volts (10K ECL) -4.5 volts (100K ECL). typically connected GND. typically connected -2.0 volts. network shown below terminate transmission lines provides 0.01 capacitor reduce cross talk feedthrough effects. actual, effective delay impedance loading from stubs additional devices line will Tpd'
Cd/Co (Cd/Co)
BOURNS TERMINATOR
Where intrinsic capacitance line capacitance loading stubs line basic propagation delay line basic impedance line
MC10H118 MECL 10KH Vcc1 Aout A1in A1in A1in B2in B2in A2in,B2in B1in Vcc2 Bout B1in B1in
formulate guideline when line termination necessary, take ratio rise time fall time twoway delay along line. maximum length unterminated lines will result follows:
TRANSMISSION LINES
Lmax
2Tpd'
Transmission Line Considerations high speed circuit applications, signal propagation delay (Tpd) characteristic impedance (zo), along printed circuit board line must taken into consideration. general, two-way delay along line greater than rise fall time signal, then controlled impedance techniques (i.e., termination) must utilized prevent undesirable ringing overand undershoots. delay impedance calculated knowing intrinsic inductance (Lo) capacitance (Co) line:
Where rise fall time propagation delay unit length above equation implies that faster edge rate higher loading line (i.e., higher fanout), more likely that termination will necessary given line length.
Parallel Termination maximum circuit performance distributed loads, parallel termination most appropriate technique. parallel terminated line uses resistor connected volts (ECL application) receiving end. resistor value matches characteristic impedance line (Zo), thereby producing zero reflection receiver. addition, terminating resistor also provides output pull down, separate pull down resistor driving unnecessary.
LoCo Lo/Co
PRODUCT SPECIFICATIONS, PAGES 294. Specifications subject change without notice.
technical assistance call Networks Products number back cover.
Bourns Emitter Coupled Logic Terminator Series
Bourns 801, 802, conformal coated resistor capacitor networks designed terminate transmission lines using parallel termination technique. 0.01 capacitor(s) provided each network help maintain solid level within package, mitigating potential cross talk feedthrough effects. circuit also contains capacitor bypassing supply. calculated using following equations: (Vee/Vtt)*Zo (R2*Vtt)/(Vee-Vtt) supply voltage -5.2V -2V: 2.6*Zo R2/1.6 100K supply voltage -4.5V -2V: 2.25*Zo R2/1.25 Parallel Termination Technique
Thevenin Equivalent Parallel Termination Parallel termination applications uses -2.0 volts terminating voltage. This represents disadvantage since separate power supply must available (Vee -5.2 volts, -2.0 volts). systems which separate -2.0 volt supply available, Thevenin equivalent arrangement, although resulting higher power consumption, provides convenient solution. Bourns conformal coated resistor capacitor networks designed terminate transmission lines using Thevenin equivalent parallel termination technique. Again, capacitor provided help maintain solid level within package, mitigating potential cross talk feedthrough effects. designed with whereas designed with 100K ECL.
Thevenin Equivalent Parallel Termination Technique
References: Blood, W.R., MECL System Design Handbook, Motorola, Inc., 1983. F100K Data Book, Fairchild Semiconductor Corp., 1986. MECL Device Data, Motorola, Inc., 1987. ECLinPS Data, Motorola, Inc., 1987.
Specifications subject change without notice.

Bourns Emitter Coupled Logic Terminator Series Typical Applicatio

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