Use EDWinXP naming convention (eg ADC1241 for Analog to Digital converter ADS1241E)
Symbol and Entry should be placed on grid 2.54 mm
Width-Height ratio of the symbol should preferably be 1:3.
Pin length should be 5.08mm
Space between consecutive pin should be 2.54mm
Symbol description should be meaningful as given in datasheet
Orientation of entries
In all cases regardless of symbol size & shape, the 1st entry should be on the top left corner.
Positioning of Pins
All inputs should be on the left side and outputs on the right side of the symbol.
For very big symbols having inputs 2/3 of all pins, inputs may be placed in three sides of the symbol starting from top left corner and ending at top right corner
For very big symbols having outputs 2/3 of all pins, we can keep inputs and control pins in the left side and outputs starting from bottom left and ending at top left of the symbol.
Positioning of Supply Pins
(a) For rectangles using only two sides
+Ve supply pin should be on top right corner , –Ve supply pin should be on bottom right corner and GND pin should be on bottom left corner of rectangle
(b) For rectangles using all sides
+ve power supply (+Vcc) pins should be on top side and -ve power supply (-Vcc) should be on the bottom side of the rectangle ,GND should be on the bottom left side of the rectangle
(c) For symbols using other graphic items
In all other cases +ve power supply pins should be on top side and -ve power supply should be on the bottom of the symbol.
Entry attribute should be the name of the pin. For negated signal conditions, a TILDE (~) should be used before the name of the pin.
REPRESENTATION OF NEGATED SIGNALS USING BUBBLES AND BAR
TEXT SIZE & TEXT PITCH
The size of all texts including COMPNAME and COMPDESC should preferably be 60 mil.
The pitch of text should be 24 mil.
Texts should be placed within the symbol and 20 mil away (left / right / top / bottom) from the boundary of the symbol.
PA shift should be placed 20 mil to the right/left and 20 mil to the top/bottom of the entry.
The line size (thickness) of all graphic items should be 8 mil