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1. Description
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
2. Feature
1. Operating Voltage Range of 4.5 V to 5.5 V
2. Low Power Consumption, 80-µA Max ICC
3. Typical tpd = 12 ns
4. ±6-mA Output Drive at 5 V
5. Low Input Current of 1 µA Max
6. Inputs Are TTL-Voltage Compatible
7. High-Current 3-State Outputs Interface Directly With System Bus or Can Drive Up To 15 LSTTL Loads
8. Data Flow-Through Pinout
3. Pin configuration
