Quatech DS-100 User Manual
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Contents
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8. SpecificationsBAUD RATES:66005500430024701000115.225% TRAN20% TRAN15% TRAN10% TRAN4% TRANMAXIMUM LOAD (pF)DATA RATE(kbaud)NOTE 1: The signal transition time ratio is defined as the percentage of the unit intervalor 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%; mostRS-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 200kbaud. If maximum signal transition time ratio is extended to 10%, 15%, 20%, or even25%, the maximum data rate achievable using EIA/TIA-232-E can be increased past 200kbaud.NOTE 2: A typical value for capacitance per foot of standard cable is 50 pF/ft.UARTs: Two 16550 UARTs with 16-byte FIFOsTRANSMIT DRIVERS: SN75150 or compatibleHIGH LEVEL OUTPUT: +5V min, +8V typicalLOW LEVEL OUTPUT: -5V max, -8V typicalSWITCHING SPEED, LOW-HIGH: 1.4 μs with 2500 pF load40 ns with 15 pF loadSWITCHING SPEED, HIGH-LOW: 1.5 μs with 2500 pF load20 ns with 15 pF loadRECEIVE BUFFERS: MC1489 or compatibleHIGH LEVEL OUTPUT: +3V to +13VLOW LEVEL OUTPUT: -3V to -13VSWITCHING SPEED: 120 ns typical, 175 ns maxBASE ADDRESS RANGE: 0000 hex to FFF8 hexINTERRUPT OPTIONS: 2-7, 10-12, 14-15CONNECTORS: Two DB-9 male connectorsSLOT REQUIREMENTS: One 16-bit ISA slotDIMENSIONS: 7.050” x 3.900”POWER REQUIREMENTS: +5 volts 908 mA max+12 volts 66 mA max7-1 Quatech Inc. |
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