RS-422 interface excellent choice communicating noisy environments ove

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

RS-422 interface excellent choice communicating noisy environments ove

Datasheet Thumbnail

Top Searches for this datasheet

Standby current RS-422 repeater less than
RS-422 interface excellent choice communicating noisy environments over distance. However, when distance exceeds RS-422 capability reliable data transfer, must repeater. repeater circuit Figure which must operate from batteries when power supply available, draws less than current from supply. standby power true fail-safe operation features this application. drive their receiver outputs (RO) high when RS-422 inputs open circuited terminated undriven. incoming data byte differential inputs forces transition state machine (right half Figure schematic) latched falling edge state machine asserts high level U2's driver-enable pin, causing incoming data byte retransmitted from full RS-422 levels. state machine watches transitions When data-byte transfer complete indicated falling edges within time delay internal state machine), state machine resets itself anticipation next data byte from either side interface. incoming data burst (Figure top) retransmitted outputs (bottom trace) (middle trace). de-asserts those outputs 700µs after final transition. Other delays implemented adjusting R1/C1 R2/C2 shown Figure
1N4148 4.7M 220pF 74HC00
100nF
74HC00 74HC74 74HC00 74HC74
MAX3471
GND1
GND2
100nF
MAX3471
1N4148 4.7M 220pF 74HC00
Figure This RS-422 repeater draws only standby current.
Figure input data byte causes repeater transmit byte, then standby. Vertical scale division; horizontal scale 400µs division.
(dB)

RS-422 interface excellent choice communicating noisy environments ove

Top Searches for this datasheet

Other recent searches