ODTXXNxx is a family of 1 to 24 mA, non-inverting, TTL-level, output buffer pieces with N-channel, open-drains (pulldown). Logic Symbol Truth Table ODTXXNxx A PADM A PADM LL HZ Z = High Impedance HDL Syntax Verilog ODTXXNxx inst_name (PADM, A); VHDL inst_name: ODTXXNxx port map (PADM, A); Pin.