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8. Specifications
BAUD RATES:
66005500430024701000115.2
25% TRAN20% TRAN15% TRAN10% TRAN4% TRAN
MAXIMUM LOAD (pF)DATA RATE
(kbaud)
NOTE 1: The signal transition time ratio is defined as the percentage of the unit interval
or bit time (the inverse of the data rate) that is occupied by the signal transitioning from
-3V to +3V. EIA/TIA-232-E defines a maximum signal transition time ratio of 4%; most
RS-232 receivers will recognize signal transitions with much larger ratios. With a 4%
signal transition time ratio, EIA/TIA-232-E is limited to a theoretical data rate of 200
kbaud. If maximum signal transition time ratio is extended to 10%, 15%, 20%, or even
25%, the maximum data rate achievable using EIA/TIA-232-E can be increased past 200
kbaud.
NOTE 2: A typical value for capacitance per foot of standard cable is 50 pF/ft.
UARTs: Two 16550 UARTs with 16-byte FIFOs
TRANSMIT DRIVERS: SN75150 or compatible
HIGH LEVEL OUTPUT: +5V min, +8V typical
LOW LEVEL OUTPUT: -5V max, -8V typical
SWITCHING SPEED, LOW-HIGH: 1.4 µs with 2500 pF load
40 ns with 15 pF load
SWITCHING SPEED, HIGH-LOW: 1.5 µs with 2500 pF load
20 ns with 15 pF load
RECEIVE BUFFERS: MC1489 or compatible
HIGH LEVEL OUTPUT: +3V to +13V
LOW LEVEL OUTPUT: -3V to -13V
SWITCHING SPEED: 120 ns typical, 175 ns max
BASE ADDRESS RANGE: 0000 hex to FFF8 hex
INTERRUPT OPTIONS: 2-7, 10-12, 14-15
CONNECTORS: Two DB-9 male connectors
SLOT REQUIREMENTS: One 16-bit ISA slot
DIMENSIONS: 7.050” x 3.900”
POWER REQUIREMENTS: +5 volts 908 mA max
+12 volts 66 mA max
7-1 Quatech Inc.