This research on ECL was necessary for the repair of my HP 8016A Word Generator which had some faulty ECL IC's, for which data sheets and spares seemed to be unavailable on the web. I was aware of ECL and some of its features but had not used it before.
This family of high speed logic integrated circuits was developed by Motorola in the 1960's. ECL stands for Emitter-Coupled Logic and the Motorola series was known as MECL.
There were 5 series of MECL IC's from Motorola: MECL I 1962-1977 30MHz switching and 8ns gate propagation delay; MECL II 1966-1979 70MHz switching and 4ns gate propagation delay (which increased to 180MHz and 2ns over the years); MECL III 1968-19?? 500MHz switching and 1ns gate propagation delay; MECL 10K (1971-) and MECL 10KH (1981-) were further improvements.
In 1999 Motorola divested its semiconductor business to ON Semiconductor.
TTL and CMOS IC's generally source current to the load in the high state (Logic '1') and sink current from the load in the low state (Logic '0'). They are powered by a single positive Vcc (+5V TTL) power supply.
In contrast ECL operates in the non-saturated transistor region so that current conditions are fairly constant whether high or low. This also helps to prevent power switching noise being introduced into the circuit. ECL also uses a -5.2V negative power supply Vee. [Modern versions of ECL are available that use positive power supplies, PECL, LVPECL, etc, which are outside the scope of this research].
ECL IC's use a differential amplifier input and emitter follower outputs which are biased to remain within their operating curves rather than switching off or saturating. This dramatically improves their switching speeds, typically to <1ns.
Logic Levels: Typically only 0.7V difference between high and low states, which can cause noise problems.
Logic '0' Low (VOL) can vary between -1.4V and -1.9V
Logic '1' High (VOH) can vary between -0.7V and -1.2V
This is with all outputs loaded with 50Ω to -2.0V
Inputs are generally (check data sheet) internally pulled down to Vee, so unused inputs can be left floating and assume a logic '0' state.
Other Voltage Levels are:
Vcc1 0V Ground (often just output stage to provide separation from input)
Vcc2 0V Ground (often just input stage to provide separation from output)
Vee -5.2V Negative Power, also tied to unused inputs
Vtt -2.0V Termination Voltage
Vbb -1.29V Bias Voltage
ECL IC's Used In HP Test Equipment
HP Part Number
16-Bit Coincident Memory w/o Pulldowns
Quad Level Translator (MECL to Saturated Logic)
Dual 4 Input OR/NOR
Quad 2 Input NOR
Quad 2 Input OR/NOR
Quad 2 Input NOR
Triple 2-3-2 Input OR/NOR
Triple 4-3-3 Input NOR
|MC10107L||Triple 2 Input XOR/XNOR||3762A||MOT||1820-0805 |
Dual 4-5 Input OR/NOR
Dual 3 Input 3 Output OR
Dual 3 Input 3 Output NOR
4 Wide 4-3-3-3 Input OR-AND
4 Wide OR-AND/OR-AND-INVERT
Dual D-Type Master-Slave Flip-Flop
|MC10135L||Dual J-K Master-Slave Flip-Flop||3762A||MOT||1820-0820 |
|MC10137P||Universal Decade Counter||3762A||MOT||1820-0822 |
|MC10164L||8-Line Multiplexer||3762A||MOT||1820-0829 |
|MC10176P||Hex D-Type Master-Slave Flip-Flop||3762A||MOT||1820-1399 |
|MC10210P||Dual 3 Input 3 Output OR||3762A||MOT||1820-1830 |
|MC10211P||Dual 3 Input 3 Output NOR||3762A||MOT||1820-1482 |
High Speed Triple Line Receiver
High Speed Dual D-Type Master-Slave Flip-Flop
P = Plastc DIL 16 Pin
C or L = Ceramic DIL 16 Pin
HP Part Numbers were often printed on the IC's instead of the industry standard (JEDEC) part numbers. I have a searchable PDF cross-reference list of 143 pages. This will help identify IC's from scrapped equipment.
I am trying to obtain Motorola ECL Databooks and some Datasheets for these IC's. Many are available from www.datasheetcatalog.com