MOTOR=
OLA ECL
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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.=C2=A0 I was =
aware of ECL and some of its features but had not used it before.=
font>
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Jul=
y 2009
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This family of =
high speed logic integrated circuits was developed by Motorola in the 19=
60's.=C2=A0 ECL stands for Emitter-Coupled Logic and the Motorola series=
was known as MECL.
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There were=
5 series of MECL IC's from Motorola: MECL I 1962-1977 30MHz switching a=
nd 8ns gate propagation delay; MECL II 1966-1979 70MHz switching and 4ns=
gate propagation delay (which increased to 180MHz and 2ns over the year=
s); MECL III 1968-19?? 500MHz switching a=
nd 1ns gate propagation delay; MECL 10K (1971-) and MECL 10KH (1981-) we=
re further improvements.
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In 19=
99 Motorola divested its semiconductor business to ON Semiconductor.=C2=A0
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 posi=
tive Vcc (+5V TTL) power supply.
=C2=A0<=
/div>
In contrast ECL operates in the non-saturated transistor region so th=
at current conditions are fairly constant whether high or low.=C2=A0 Thi=
s also helps to prevent power switching noise being introduced into the =
circuit. =C2=A0ECL also uses a -5.2V negative power supply Vee. =C2=A0[M=
odern versions of ECL are available that use positive power supplies, PE=
CL, LVPECL, etc, which are outside the scope of this research].=
div>
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ECL IC's use a differential amplifier =
input and emitter follower outputs which are biased to remain within the=
ir operating curves rather than switching off or saturating. This dramat=
ically improves their switching speeds, typically to <1ns.=C2=A0
Logic Levels: Typically only 0.7V diff=
erence between high and low states, which can cause noise problems.
Logic '0' Low (VOL) can vary between -1.4V and -1.9V
<=
div align=3D"left">
Log=
ic '1' High (VOH) can vary between -0.7V and -1.2V This is wit=
h all outputs loaded with 50=E2=84=A6 to =
-2.0V
Inputs are generally (check data sheet) internally pulle=
d down to Vee, so unused inputs can be left floating and assume a logic =
'0' state.
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<=
font face=3D"Verdana, Arial, Geneva, sans-serif">Other Voltage L=
evels are:
Vcc1 0V Ground (often just output stage t=
o provide separation from input)
Vcc2 0V Ground (often just in=
put stage to provide separation from output)
Vee -5.2V Negativ=
e Power, also tied to unused inputs
Vtt -2.0V Termination Volt=
age
Vbb -1.29V Bias Voltage
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=A0
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ECL IC's Used In HP Test Equipment |
=
Part Number | Memory | Equipment | Data Sheet | HP Part Number |
MC1037P | 16-Bit Coincident Memory w/o Pulldowns=
p> | 8016A <=
/font> | Wanted | 1820-1227 | =
tr>
MC1039P<=
/font> | Quad Level Translator (MECL to Saturated Logic) | =
8016A | =
MOT =
| 1820-0275=
|
MC1660L | Dual 4 Input OR/NOR | 3762A | <=
p align=3D"center">MOT=
| 1820-0790 |
MC1662L | Quad 2 Input NOR | 8016A | MOT | 1820-079=
6 |
MC1670L | Master-Slave Flip-Flop | 3762A | 1820-0794 =
|
| | | | =
|
MC10101L | Quad 2 Input OR/NOR | 8016A | MOT | 1820-080=
1 |
MC10102P | Quad 2 Input NOR | 8016A | MOT | 1820-0802 =
|
M=
C10105L | Triple 2-3-2 Input OR/NOR | 8016A | MOT | =
1820-0803 =
td> |
<=
p align=3D"center">MC1=
0106L | Triple 4-3-3 Input NOR | 8016A | MOT | 1820-0804 |
MC10107L=
| Triple 2 Input XOR/XNOR<=
/td> | 3762A | MOT | 1820-0805 |
MC10109L | Dual 4-5 Input OR/NOR | <=
font face=3D"Verdana, Arial, Geneva, sans-serif">8016A | <=
td align=3D"center" style=3D"BORDER-BOTTOM: #777777 1px solid; BORDER-LE=
FT: #777777 1px solid; BORDER-TOP: #777777 1px solid; BORDER-RIGHT: #777=
777 1px solid" colspan=3D"1" rowspan=3D"1" class=3D"light">MOT
=
1820-0806=
|
MC10110L | Dual 3 Input 3 Output OR | 8016A | MOT | 1820-0807 |
MC10111L | Dual 3 Input 3 Output NOR | 8016A | MOT | =
1820-0808 |
MC10119L | 4 Wide 4-3-3-3 Input OR-AND | 8016A | MOT | 1820-0813 |
MC10121P | 4 Wide OR-AND/OR-AND-INVER=
T | 8016A | MOT | 1820-0815 |
MC10131P | Dual D-Type Master-Slave Fl=
ip-Flop | 8016A | MOT | 1820-0817 |
MC10135L | Dual J-K Master-Slave Flip-Flop | 3762A | MOT | 1820-0=
820 |
MC10137P | Universal D=
ecade Counter | 3762A | <=
td style=3D"BORDER-BOTTOM: #777777 1px solid; BORDER-LEFT: #777777 1px s=
olid; BORDER-TOP: #777777 1px solid; BORDER-RIGHT: #777777 1px solid" co=
lspan=3D"1" rowspan=3D"1" class=3D"light">MOT1820-0822 |
MC10164L | 8-Line Multiplexer | 3762A | MOT | 1820-0829 |
MC10176P | Hex D-Type Master-Slave Flip-Flop | =
3762A | MOT | 1820-1399 |
MC10210P | Du=
al 3 Input 3 Output OR | 37=
62A | MOT | 1820-1830 |
MC10211PDual 3 Input 3 Output NOR | 3762A | MOT | 1820-1482 |
MC102=
16P | High Speed Triple Line Receiver | 8016A | MOT | <=
font face=3D"Verdana, Arial, Geneva, sans-serif">1820-1224 |
MC10=
231P | High Speed Dual D-Type Master-Slave Flip-Flop | 8016A =
td> | MOT | 1820-122=
5 |
| | | | |
NOTES: P =3D Plastc DIL 16 Pin C or L =3D Ceramic DIL 16 Pin =
|
=
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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 14=
3 pages. This will help identify IC's from scrapped equipment.
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I am trying to obtain Motorola ECL Databooks a=
nd some Datasheets for these IC's. Many are available from www.datasheetcatalog.com =
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