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.
| Technology family | HCT |
| Supply voltage (min) (V) | 4.5 |
| Supply voltage (max) (V) | 5.5 |
| Number of channels | 8 |
| IOL (max) (mA) | 6 |
| IOH (max) (mA) | -6 |
| Supply current (max) (µA) | 80 |
| Input type | TTL-Compatible CMOS |
| Output type | 3-State |
| Features | Balanced outputs, Very high speed (tpd 5-10ns) |
| Rating | Military |
| Operating temperature range (°C) | -55 to 125 |
| CDIP (J) | 20 | 167.464 mm² 24.2 x 6.92 |
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