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Latched active fail-safe circuit for protecting a differential receiver
Latched active fail-safe circuit for protecting a differential receiver
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机译:锁存的主动故障安全电路,用于保护差分接收器
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摘要
A fail-safe circuit for a differential receiver can tolerate noise. A latch is enabled when both differential inputs V+, V− rise above a reference voltage that is close to Vcc. The latch, once enabled, is set by an offset amplifier, signaling the fail-safe condition. The offset amplifier sets the latch when V+ is above or equal to V−. The differential amplifier has a small offset voltage to allow the latch to remain set when V+ and V− are equal in voltage. An output from a differential amplifier receiving V+ and V− can be blocked by a gate when the fail-safe condition is latched. Pullup resistors pull V+, V− to Vcc when an open failure occurs. The latch remains set when common-mode noise occurs on V+, V−, preventing noise from prematurely disabling the fail-safe condition. Such noise coupled into a broken cable is usually common-mode.
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