RHFLVDS228A Datasheet, PDF (9/16 Pages) STMicroelectronics – Rad-hard, dual 4x4 crosspoint switch LVDS

RHFLVDS228A
Electrical characteristics
Cold sparing
The RHFLVDS228A features a cold spare input and output buffer. In high reliability
applications, cold sparing enables a redundant device to be tied to the data bus with its
power supply at 0 V (V_CC = GND) without affecting the bus signals or injecting current from
the I/Os to the power supplies. Cold sparing also allows redundant devices to be kept
powered off so that they can be switched on only when required. This has no impact on the
application. Cold sparing is achieved by implementing a high impedance between the I/Os
and V_CC. ESD protection is ensured through a non-conventional dedicated structure.
Fail-safe
In many applications, inputs need a fail-safe function to avoid an uncertain output state
when the inputs are not connected properly. In case of an LVDS input short circuit or floating
inputs, the LVDS outputs remain in stable logic-high state.
DocID025373 Rev 1
9/16
16