The 'ABT640 bus transceivers are designed for asynchronous communication between data buses. These devices transmit inverted data from the A bus to the B bus or from the B bus to the A bus, depending on the level at the direction-control (DIR) input. The output-enable (
) input can be used to disable the device so that the buses are effectively isolated.
To ensure the high-impedance state during power up or power down, 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.
The SN54ABT640 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT640 is characterized for operation from -40°C to 85°C.
EPIC-IIB is a trademark of Texas Instruments Incorporated.
| Supply voltage (min) (V) | 4.5 |
| Supply voltage (max) (V) | 5.5 |
| Number of channels | 8 |
| IOL (max) (mA) | 64 |
| IOH (max) (mA) | -32 |
| Input type | TTL |
| Output type | TTL |
| Features | Over-voltage tolerant inputs, Partial power down (Ioff), Very high speed (tpd 5-10ns) |
| Technology family | ABT |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 85 |
| PDIP (N) | 20 | 228.702 mm² 24.33 x 9.4 |
| SOIC (DW) | 20 | 131.84 mm² 12.8 x 10.3 |
| SOP (NS) | 20 | 98.28 mm² 12.6 x 7.8 |
| SSOP (DB) | 20 | 56.16 mm² 7.2 x 7.8 |
| TSSOP (PW) | 20 | 41.6 mm² 6.5 x 6.4 |
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