SN74LS126ADR

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(overline) is high. The ’126 and ’LS126A devices outputs are disabled when G is low.

Applications

• Bus system buffer driver

Key features

• Enabled: low-impedance TTL output characteristics with extra drive capability at high logic level — drives heavy-load bus lines without external pull-up resistors
• Disabled: both output transistors cut off, presenting high impedance to the bus — neither a significant load nor a drive source
• '125 and 'LS125A: output disabled when G is HIGH; '126 and 'LS126A: output disabled when G is LOW
• '125 and '126 absolute maximum ratings: supply voltage VCC up to 7V, input voltage VI up to 5.5V, N package thermal resistance θJA = 80°C/W, storage temperature range −65°C to 150°C
• 'LS125A and 'LS126A absolute maximum ratings: supply voltage VCC up to 7V, input voltage VI up to 7V, D package θJA = 86°C/W, N package θJA = 80°C/W, NS package θJA = 76°C/W, storage temperature range −65°C to 150°C
• All typical electrical characteristics measured at VCC = 5V, TA = 25°C
• Some pins have no internal connection