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74 TTL ICs in xilinx webpack

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7rots51

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xilinx ttl

How we can use 74 TTL ICs in ISE webpack 7.1 (xilinx)? Is there any available library including 74 series for xilinx webpack?
 

mrakira

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where to +buy ttl discrete logic chips

74xx not include in xilinx library.If u want u can compile in new symbol.
 

amir_shahhoseini

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chip ttl 7400 en vhdl

you can find in TTL library start with x74_
 

kang_computer_01

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74ls series logic ics

any body have source code of 74xxx vhdl in behaveior.
 

boardlanguage

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74 library for xilinx

7rots51 said:
How we can use 74 TTL ICs in ISE webpack 7.1 (xilinx)? Is there any available library including 74 series for xilinx webpack?
CAUTION...

The legacy 74XX logic-ICs, i.e. the actual discrete DIP chips you could buy from neighborhood electronics store, use 5 volt TTL signalling.

Modern (since Spartan 3, Virtex 4) Xilinx FPGAs are not compatible with 5V TTL! If you connect your FPGA to 74XX chip directly, you will damage/destroy the FPGA. (You can make the Xiilinx FPGA's 5v tolerant by adding series resistor to the I/O pads. But the FPGA will still send out 3.3v signalling-levels.)

Also, most companies that sell 74XX now sell CMOS (3.3v) versions of those chips. Those are safe to use with the Xilinx FPGA.
 

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