SN74125

The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied. SN54125, SN54126, SN54LS125A, SN54LS126A, SN74125, SN74126, SN74LS125A, SN74LS126A QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS SDLS044A – DECEMBER 1983 – REVISED MARCH 2002 D Quad Bus Buffers D 3-State Outputs D Separate Control for Each Channel description These bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors. When disabled, both output transistors are turned off, presenting a high-impedance state to the bus so the output will act neither as a significant load nor as a driver. The ’125 and ’LS125A devices’ outputs are disabled when G is high. The ’126 and ’LS126A devices’ outputs are disabled when G is low. SN54125, SN54126, SN54LS125A, SN54LS126A . . . J OR W PACKAGE SN74125, SN74126 . . . N PACKAGE SN74LS125A, SN74LS126A . . . D, N, OR NS PACKAGE (TOP VIEW) 1G, 1G* 1A 1Y 2G, 2G* 2A 2Y GND 1 2 3 4 5 6 7 14 VCC 13 4G, 4G* 12 4A 11 4Y 10 3G, 3G* 9 3A 8 3Y *G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices SN54LS125A, SN54LS126A . . . FK PACKAGE (TOP VIEW) 1A 1G, 1G* NC VCC 4G, 4G* 1Y NC 2G, 2G* NC 2A 3 2 1 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 4A NC 4Y NC 3G, 3G* 2Y GND NC 3Y 3A *G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices NC – No internal con...