Measurement Computing PCI-COM422/485 - Manual (Page 20)

16
RTS/CTS Transceiver type SP490
Data Rate 5Mbps min.
RTS/CTS Transceiver Input Characteristics
Input Voltage ±14V max.
Data Rate 5Mbps min.
Differential Threshold Voltage ±0.2V
Input Current 1mA (Vin = 12V)
-0.8mA (Vin=-7V)
Propagation Delay 90ns typ. (tplh/tphl)
RTS/CTS Transceiver Output Characteristics
Differential Output Voltage GND to Vcc (unloaded)
Short Circuit Current
±250mA
Propagation Delay 30ns typ. (tplh/tphl)
Miscellaneous All inputs supplied with 120 ohm jumper selectable
termination, data pull-up and data pull-down
resistors
T RANSIENT V OLTAGE S UPPRESION O PTION
Board Description
PCI-COM422/485/S
PCI-COM 422/485-2/S
Data Transceiver Input SP491
Input Voltage Range (derated)
±12V
RTS/CTS Transceiver Input SP490
Input Voltage Range (derated)
±12V
TVS type SMAJ12A
Working Voltage ±12V
Breakdown Voltage 13.3V min.
14.7V max.
Peak Pulse Surge Current 15.1A max. (avalanche duration time =10µs)
Peak Pulse Power Dissipation 300W max. (avalanche duration time =10µs)
Peak Pulse Power Dissipation is proportional to the
amount of time the TVS remains in the avalanche
mode. For specific power vs. avalanche duration
information, consult the SMAJ12A datasheet.
E NVIRONMENTAL
Operating temperature range 0 to 70°C
Storage temperature range -40 to 100°C
Humidity 0 to 90% non-condensing