Other Parts Discussed in Thread: TINA-TI
Hi All, Greetings!!
In One of the product IC: 74LVC1G17 is used, To understand full function IC: 74LVC1G17 Schemitt Trigger I download scem635.zip downloaded and IC: 74LVC1G17, SN74LVC1G17.cir (SPice Model Files) adding in LTspice tool to create IC component to Test.
.SUBCKT SN74LVC1G17 Y A VCC AGND
XU1 Y A VCC VCC AGND LOGIC_GATE_2PIN_OD_LVC_1i_AND_PP_ST_SN74LVC1G17 .ENDS
IF you can see- 1stline - have only 4 parameter and are listed: Y A VCC AGND
2ndline- 5 parameter are listed : Y A VCC VCC AGND which is pin mapping is not equal. -
i couldn't create model in LTspice Tool.
further down in the file, SN74LVC1G17.cir - i found this line
.SUBCKT LOGIC_GATE_2PIN_OD_LVC_1i_AND_PP_ST_SN74LVC1G17 OUT A B VCC GND
which has 5 Pins, and as per Datasheet- 5 pins are there and Pin 1 is Not connected (NC)
Case1: I have modified to 1stline to- Y A B VCC AGND
rest of file everything Same; with this model was created- and worked
case2: I have modified to
1stline to- Y A B VCC AGND
2nd line to XU1 Y A NC VCC AGND LOGIC_GATE_2PIN_OD_LVC_1i_AND_PP_ST_SN74LVC1G17
as per Datasheet- pin Not connected rest of file everything Same;
this model created- and worked
Case3: I have modified to
1stline to- Y A B VCC AGND
2nd line to XU1 Y A B VCC AGND LOGIC_GATE_2PIN_OD_LVC_1i_AND_PP_ST_SN74LVC1G17
as per pin Naming conventions. rest of file everything Same;
this model created- and worked
Case1, Case2 ans Case 3 results are different.
All these cases input pin A grounded with 49.9K resistor- and IC powered with 3.3 VDC
Case1: Y output is: 0.65V approximately and At input A voltage is: 0.3765 V
Case2: Y output and A input No voltages are shown
case3: Y output is: 0.1542V approximately and At input A voltage is : 7.38 mV
Please share the correct and updated model for 74LVC1G17 IC.
As per Datasheet input Pin1 is NC, is it internally connected to VCC?
Thanks in Advance and await for your feedback and inputs.
