These four-data-line transceivers are designed for asynchronous two-way communications between data buses. SN74LS243 can be used to drive terminated lines down to 133 
.
SN54LS243 is characterized for operation over the full military temperature range of –55°C to 125°C. SN74LS243 is characterized for operation from 0°C to 70°C.
| Supply voltage (min) (V) | 4.5 |
| Supply voltage (max) (V) | 5.5 |
| Number of channels | 4 |
| IOL (max) (mA) | 12 |
| IOH (max) (mA) | -12 |
| Input type | TTL |
| Output type | TTL |
| Features | Balanced outputs, High speed (tpd 10-50ns) |
| Technology family | LS |
| Rating | Military |
| Operating temperature range (°C) | -55 to 125 |
| CDIP (J) | 14 | 130.4652 mm² 19.56 x 6.67 |
| CFP (W) | 14 | 58.023 mm² 9.21 x 6.3 |
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