|Category||Interface and Interconnect => RS-422/RS-423|
|Description||DS8921 - Differential Line Drivers And Receiver Pair, Package: Soic Narrow, Pin Nb=8|
|Company||National Semiconductor Corporation|
|Datasheet||Download DS8921 datasheet
|Cross ref.||Similar parts: MAX3291CPD, MAX3291CPD+, MAX3291CSD, MAX3291CSD+, MAX3291CSD+T, MAX3291CSD-T, MAX3291EPD, MAX3291EPD+, MAX3291ESD, MAX3291ESD+|
The DS8921, DS8921A are Differential Line Driver and Receiver pairs designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, these devices meet the requirements of the EIA Standard RS-422. The DS8921, DS8921A receivers offer an input sensitivity 200 mV over ± 7V common mode operating range. Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing input waveforms. The DS8921, DS8921A drivers are designed to provide unipolar differential drive to twisted pair or parallel wire transmission lines. Complementary outputs are logically ANDed and provide an output skew 0.5 ns (typ.) with propagation delays of 12 ns. The DS8921, DS8921A are designed to be compatible with TTL and CMOS.Features
12 ns typical propagation delay Output skew 0.5 ns typical Meet the requirements of EIA Standard RS-422 Complementary Driver Outputs High differential or common-mode input voltage ranges ± 0.2V receiver sensitivity over the input voltage range n Receiver input hysteresis-70 mV typical n DS8921AT industrial temperature operation: to +85°C)Receiver Input VID VTH (MAX) VID VTH (MIN) Open VOUT 0 1 Input 1 0 Driver VOUT 1 0 VOUT 0 1
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Driver Input Voltage to +7V Output Voltage 5.5V Receiver Output Sink Current ± 10V Receiver Input Voltage ± 12V Differential Input Voltage Maximum Package Power Dissipation +25°C M Package mW N Package 1160 mW Derate M Package 9.3 mW/°C above +25°C Derate N Package 5.8 mW/°C above +25°CStorage Temperature Range Lead Temperature (Soldering, 4 sec.) Maximum Junction Temperature
Symbol RECEIVER VTH VHYST RIN IIN VOH VOL ISC DRIVER VIH VIL IIL IIH II VCL VOH VOL IOFF |VT| |VT | VT |VOS VOS | ISC ICC VCC = MAX, VOUT = 0V VCC = MAX, VOUT = Logic 0 -30 DRIVER and RECEIVER 0.4 -150 VCC = MAX, VIN = 0.4V VCC = MAX, VIN = 2.7V VCC = MAX, VIN = 7.0V VCC = MIN, IIN -18 mA VCC = MIN, IOH -20 mA VCC = MIN, IOL +20 mA VCC 0V, V OUT mA -7V VCM +7V -7V VCM +7V VIN -7V, +7V (Other Input = GND) VIN = 10V VIN = -10V IOH -400 µA IOL 8 mA VCC = MAX, VOUT = 0V Conditions Min Typ Max +200 Units V mA
DIFFERENTIAL CHARACTERISTICS (Figures 3, 5) Symbol TpLH TpHL |TpLHT pHL| Conditions 30 pF (Figures 30 pF (Figures 30 pF (Figures 5, 6)
Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The Table of "Electrical Characteristics" provides conditions for actual device operation. Note 2: All currents into device pins are shown as positive values; all currents out of the device are shown as negative; all voltages are referenced to ground unless otherwise specified. All values shown as max or min are classified on absolute value basis. Note 3: All typical values are VCC = 25°C. Note 4: Only one output at a time should be shorted. Note 5: Difference between complementary outputs at the 50% point. Note 6: Differential Delays are defined as calculated results from single ended rise and fall time measurements. This approach in establishing AC performance specifications has been taken due to limitations of available Automatic Test Equipment (ATE). The calculated ATE results assume a linear transition between measurement points and are a result of the following equations:
Where: Tcr = Crossing Point Tra, Trb, Tfa and T fb are time measurements with respect to the input. See Figure 6.
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