Motorola's Emitter Coupled Logic (MECL) nonsaturating form digital log
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MECL (ECL)
Motorola's Emitter Coupled Logic (MECL) nonsaturating form digital logic which eliminates transistor storage time speed limiting characteristic, permitting very high speed operation.
Motorola offers three versions MECL: MECL 10K, MECL 10KH, MECL III.
MECL series become industry standard high-speed applications. order make circuits comparatively easy use, edge speed slowed while important propagation delay held slow edge speed permits wire-wrap standard printed circuit lines; however, circuits specified drive transmission lines optimum performance.
newer MECL 10KH family features 100% improvement propagation delay clock speeds while maintaining power supply current equal MECL 10K. This MECL family
voltage compensated which allows guaranteed switching parameters over power supply range. Noise margins MECL 10KH better than MECL. series. MECL 10KH compatible with MECL MECL III, element allowing users enhance existing systems increasing speed critical timing areas.
MECL III, with gate propagation delays greater than flip-flop toggle rates, remains industry speed leader. rise fall times require transmission line environment smallest systems. this reason, circuit outputs designed drive transmission lines output logic levels specified when driving 50-ohm loads. Because MECL Ill's fast edge speeds, multi-layer boards recommended above MHz. MECL Ill's popularity with high-speed test communications equipment.
Speed/power comparisons Motorola families follows:
SPEED/POWER CHARACTERISTICS (MECL)
(ALL TYPICAL RATINGS) MECL 10KH
Characteristic Symbol MC101XX MC102XX MC105XX MC106XX MC10H1XX MC16XX Units
Quiescent Supply Current/Gate
Power/Gate (Quiescent)
Propagation Delay
Speed Power Product
Clock Frequency (D-F/F) 'max
Clock Frequency (Counter) 'max 1200
HTL/DTL Circuits
Motorola still supplies large selection (High-Threshold Logic) (Diode-Transistor Logic) circuits. These recommended primarily replacement purposes. list available type numbers given below. complete descriptions specifications, please contact your Motorola sales office distributor.
MHTL Type Numbers MDTL Type Numbers
MC660 MC677 MC830 MC849 MC934 MC953 MC1806 1904
MC661 MC678 MC832 MC850 MC935 MC955 MC1807 MC1905
MC662 MC679 MC833 MC851 MC936 MC956 MC1808 MC1906
MC663 MC680 MC834 MC852 MC937 MC957 MC1809 MC1907
MC664 MC681 MC835 MC853 MC938 MC958 MC1810 1908
MC665 MC682 MC836 MC855 MC939 MC961 MC1811 1909
MC666 MC683 MC837 MC856 MC940 MC962 MC1812 MC1910
MC667 MC684 MC838 MC857 MC941 MC963 MC1813 MC1911
MC668 MC685 MC839 MC858 MC944 MC1800 MC1814 MC1912
MC669 MC686 MC840 MC861 MC945 MC1801 MC1815 MC1914
MC670 MC688 MC841 MC862 MC946 MC1802 MC1818 MC1915
MC671 MC689 MC843 MC863 MC948 1803 MC1820 MC1916
MC672 MC690 MC844 MC930 MC949 MC1804 MC1900 MC1918
MC673 MC691 MC845 MC932 MC950 MC1805 MC1901
MC674 MC693 MC846 MC933 MC951 MC1902
MC675 MC696 MC697 MC699 MC848 MC952 MC1903
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