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Operating Voltage Range of 4.5 V to 5.5 V

Low Power Consumption, 80-μA Max ICC

Typical tpd = 12 ns

±6-mA Output Drive at 5 V

Low Input Current of 1 μA Max

Inputs Are TTL-Voltage Compatible

High-Current 3-State Outputs Interface

Directly With System Bus or Can Drive Up

To 15 LSTTL Loads

Data Flow-Through Pinout (All Inputs on

Opposite Side From Outputs)

description/ordering information

These octal buffers and line drivers are designed to have the performance of the ’HCT240 devices and a pinout

with inputs and outputs on opposite sides of the package. This arrangement greatly facilitates printed circuit

board layout.

The 3-state control gate is a 2-input NOR. If either output-enable (OE1 or OE2) input is high, all eight outputs

are in the high-impedance state. The ’HCT540 devices provide inverted data at the outputs.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.