器件名称: SN74126
功能描述: QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
文件大小: 265.25KB 共18页
简 介: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 D D
Quad Bus Buffers 3-State Outputs Separate Control for Each Channel
SN54125, SN54126, SN54LS125A, SN54LS126A . . . J OR W PACKAGE SN74125, SN74126 . . . N PACKAGE SN74LS125A, SN74LS126A . . . D, N, OR NS PACKAGE (TOP VIEW)
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.
1G, 1G* 1A 1Y 2G, 2G* 2A 2Y GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VCC 4G, 4G* 4A 4Y 3G, 3G* 3A 3Y
*G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices SN54LS125A, SN54LS126A . . . FK PACKAGE (TOP VIEW)
1Y NC 2G, 2G* NC 2A
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
1A 1G, 1G* NC VCC 4G, 4G* 4A NC 4Y NC 3G, 3G*
*G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices NC – No internal connection Please ……
