ZHCSRU3J January 2008 – March 2023 SN65HVD1785 , SN65HVD1786 , SN65HVD1787 , SN65HVD1791 , SN65HVD1792 , SN65HVD1793
PRODUCTION DATA
The SN65HVD17xx family of RS-485 devices is designed to survive bus pin faults up to ±70V. The devices designed for fast signaling rate (10 Mbps) will not survive a bus pin fault with a direct short to voltages above 30V when:
| 1. | the device is powered on AND |
| 2a. | the driver is enabled (DE=HIGH) AND D=HIGH AND the bus fault is applied to the A pin OR |
| 2b. | the driver is enabled (DE=HIGH) AND D=LOW AND the bus fault is applied to the B pin |
| POWER | DE | D | A | B | RESULTS |
|---|---|---|---|---|---|
| OFF | X | X | -70V < VA < 70V | -70V < VB < 70V | Device survives |
| ON | LO | X | -70V < VA < 70V | -70V < VB < 70V | Device survives |
| ON | HI | L | -70V < VA < 70V | -70V < VB < 30V | Device survives |
| ON | HI | L | -70V < VA < 70V | 30V < VB | Damage may occur |
| ON | HI | H | -70V < VA < 30V | -70V < VB < 30V | Device survives |
| ON | HI | H | 30V < VA | -70V < VB < 30V | Damage may occur |