SN5406, SN5416, SN7406, SN7416 HEX INVERTER BUFFER.
Texas Instruments
SN5406 - HEX INVERTER BUFFERS/DRIVERS
SN5406, SN5416, SN7406, SN7416 HEX INVERTER BUFFERS/DRIVERS WITH OPEN-COLLECTOR HIGH-VOLTAGE OUTPUTS SDLS031A – DECEMBER 1983 – REVISED DECEMBER 2001 .