Measurement Computing PCI-COM232 - Manual (Page 19)

15
5.0 SPECIFICATIONS
Typical for 25°C unless otherwise specified.
P OWER CONSUMPTION
PCI-COM232 +5V: 220 mA typical
PCI-COM232/2 +5V: 225 mA typical
PCI-COM232/4 +5V: 230 mA typical
C OMMUNICATIONS S PECIFICATIONS
UART Type 16C550 with 16 byte FIFO
Baud Rate 300 baud to 115.2 Kbaud standard mode
1200 baud to 460.8 Kbaud extended rate mode
I NPUT /O UTPUT SECTION
Transceiver type SP211H
Transceiver Output Characteristics
Output Voltage Range ±5V min., ±7V typ
Short Circuit Current (infinite duration) ±25 mA
Propagation Delay (TTL to RS-232) 1 µs typ.
Output Enable 400 ns typ.
Output Disable 250 ns typ.
Transceiver Input Characteristics
Input Voltage Range ±15V
Propagation Delay (RS-232 to TTL) 1.5 µs typ.
Voltage Threshold
Vil 0.8V max
Vih 2.4V min
Hysteresis 0.5V typ.
T RANSIENT V OLTAGE S UPPRESION O PTION (/S VERSION )
Board Description
PCI-COM232 /S
PCI-COM232 /2/S
PCI-COM232 /4/S
Data Transceiver Input SP211H
Input Voltage Range (derated) ±12V
TVS type SMAJ12A
Working Peak Reverse Voltage ±12V
Breakdown Voltage 13.3V min., 14.7V max.
Peak Pulse Surge Current 15.1 A max. (avalanche duration time = 10 µs)
Peak Pulse Power Dissipation 300W max. (avalanche duration time = 10 µs)
Peak Pulse Power Dissipation is proportional to the
amount of time the TVS remains in the avalanche
mode. For specific power vs. avalanche time-
duration information, consult the SMAJ12A
datasheet.