Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
http://imgur.com/KWFIN1H
Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an n; 3 and 14 have an x. Whats the meaning of these marks? Thanks. |
#2
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
From service manual for HP 34401A DMM.
-=-=-=- http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an n; 3 and 14 have an x. Whats the meaning of these marks? Thanks. |
#3
Posted to sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
DaveC wrote:
http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an "n"; 3 and 14 have an "x". What's the meaning of these marks? That's the IEEE standard schematic notation touted by TI in the 80's. The downward sloping triangle means logical inversion, or active-low. I don't remember the others. |
#4
Posted to sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
On 04/07/2016 17:49, Tom Del Rosso wrote:
DaveC wrote: http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an "n"; 3 and 14 have an "x". What's the meaning of these marks? That's the IEEE standard schematic notation touted by TI in the 80's. The downward sloping triangle means logical inversion, or active-low. I don't remember the others. In that case "x" means don't care |
#5
Posted to sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
On 4.7.16 18:26, DaveC wrote:
http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an n; 3 and 14 have an x. Whats the meaning of these marks? Thanks. The 'n' pins are non-logic signals. The 'x' pins are power supply pins, see the chip data sheet. -- -TV |
#6
Posted to sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
On 7/4/2016 8:26 AM, DaveC wrote:
http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an n; 3 and 14 have an x. Whats the meaning of these marks? The little triangle (sort of like half an arrowhead?) denotes active low (what used to be indicated by a "bubble"). The tip of the arrow indicates the direction of signal flow. Can appear on a gazinta or a cumzouta. A (real!) triangle inside the device outline denotes a dynamic/clock input (edge) The "n" (actually, more like an upside down U) denotes an analog signal (look at the device and you can see why this is so!) when encountered on a digital signal; a '#' indicates a digital signal when encountered on an analog signal. The 'x' indicates a "non-logic" signal (in yor case, the reference gnd) There are other markings that indicate postponed outputs, tristate outputs, open-collector, open-emitter, hysteresis, etc. |
#7
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
|
#8
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
On 4 Jul 2016, Don Y wrote:
The "n" (actually, more like an upside down U) denotes an analog signal (look at the device and you can see why this is so!) when encountered on a digital signal; a '#' indicates a digital signal when encountered on an analog signal. ?? "when encountered on? So both of these pins are mixed-signal? n is mostly-digital and # is mostly-analog? (c; |
#9
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
Datasheet:
http://www.analog.com/media/en/techn...ets/AD7524.pdf Pins 12, 13 are latch enables that arent used so tied to ground. The tiny triangles are probably enable-low indicators. Still not sure about n, #, x... -=-=-=- On 4 Jul 2016, I wrote: From service manual for HP 34401A DMM. -=-=-=- http://imgur.com/KWFIN1H Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have what looks like an n; 3 and 14 have an x. Whats the meaning of these marks? Thanks. |
#10
Posted to sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
On Mon, 04 Jul 2016 12:44:48 -0700, DaveC wrote:
On 4 Jul 2016, wrote: It looks like they are saying these pins go to the AC ground bus. As denoted by the huge triangle (left of the junction) and ACGND... Why would the designers put those small triangles there if the connection and label already make this obvious? Which triangles are you talking about? The triangles on the power pins simply denote a global (power) connection. That's all. The wedges where the pins connect to the body denote an inverted pin, or a "logic low active" signal. The fact that these are grounded simply means that these signals are tied "active". |
#11
Posted to sci.electronics.basics, sci.electronics.components, sci.electronics.design, sci.electronics.repair, alt.engineering.electrical
|
|||
|
|||
Schematics nomenclature
|
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Baluster Nomenclature? | Woodturning | |||
Lamp nomenclature | Home Repair | |||
Nomenclature | Metalworking | |||
Finally! Nomenclature.... | Metalworking | |||
Insert nomenclature | Metalworking |