Details, datasheet, quote on part number: DS89C21TN
PartDS89C21TN
CategoryInterface and Interconnect => RS-422/RS-423
DescriptionDS89C21 - Differential CMOS Line Driver And Receiver Pair, Package: Soic Narrow, Pin Nb=8
CompanyNational Semiconductor Corporation
DatasheetDownload DS89C21TN datasheet
Cross ref.Similar parts: DS14185, DS1487, DS16F95A, DS16F95QML, DS36276, DS36277, DS3695, DS3695A, DS3695AT, DS3695T
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Features, Applications
DS89C21 Differential CMOS Line Driver and Receiver Pair

The is a differential CMOS line driver and receiver pair, designed to meet the requirements TIA/EIA-422-A (RS-422) electrical characteristics interface standard. The DS89C21 provides one driver and one receiver in a minimum footprint. The device is offered an 8-pin SOIC package. The CMOS design minimizes the supply current to 6 mA, making the device ideal for use in battery powered or power conscious applications. The driver features a fast transition time specified at 2.2 ns, and a maximum differential skew 2 ns making the driver ideal for use in high speed applications operating above 10 MHz. The receiver can detect signals as low as 200 mV, and also incorporates hysteresis for noise rejection. Skew is specified 4 ns maximum. The DS89C21 is compatible with TTL and CMOS levels (DI and RO).

Features

n Meets TIA/EIA-422-A (RS-422) and CCITT V.11 recommendation n LOW POWER design 15 mW typical n Guaranteed AC parameters: Maximum driver skew 2.0 ns Maximum receiver skew ns n Extended temperature range: +85C n Available in SOIC packaging n Operates over 20 Mbps n Receiver OPEN input failsafe feature

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) Driver Input Voltage (DI) Driver Output Voltage (DO, DO ) Receiver Input Voltage V

(TSTG) +150C +260C Lead Temperature (TL) (Soldering 4 sec.) Maximum Junction Temperature 150C Maximum Package Power Dissipation @+25C M Package 714 mW Derate M Package 5.7 mW/C above +25C

(RI, RI*) Differential Receiver Input Voltage VDIFF (RI, RI*) Receiver Output Voltage (RO) Receiver Output Current (RO) Storage Temperature Range

Supply Voltage (VCC) Operating Temperature (TA) Input Rise or Fall Time (DI) Min 4.50 -40 Max +85 500 Units C ns

Electrical Characteristics (Notes 2, 3) Over recommended supply voltage and operating temperature ranges, unless otherwise specified.

Symbol VIH VIL IIH, IIL VCL VOD3 VOD4 VOC IOSD IOFF Parameter Input Voltage HIGH Input Voltage LOW Input Current Input Clamp Voltage Unloaded Output Voltage Differential Output Voltage Change in Magnitude of V Differential Output Voltage Differential Output Voltage Common Mode Voltage Change in Magnitude of V

for Complementary Output States Output Short Circuit Current Output Leakage Current V OUT = 0V VCC 0V -30 VOUT = +6V VOUT = -0.25V RI, -200 RI* RO

RECEIVER CHARACTERISTICS VTL, VTH VHYS RIN IIN Differential Thresholds Hysteresis Input Impedance Input Current V

-7V, +7V, Other = 0V Other Input = 0V, VIN = +10V VIN = +3.0V VIN = +0.5V VIN = -3V VIN = -10V VDIFF = +1V VDIFF = OPEN

Output HIGH Voltage Output LOW Voltage Output Short Circuit Current

Over recommended supply voltage and operating temperature ranges, unless otherwise specified. Conditions No Load DI = VCC or GND or 0.5V Pin VCC Min Typ 3.0 3.8 Max 6 12 Units mA DRIVER AND RECEIVER CHARACTERISTICS

Switching Characteristics (Note 3) Over recommended supply voltage and operating temperature ranges, unless otherwise specified.

Symbol tPLHD tPHLD tSKD tTLH tTHL tPLH tPHL tSK tr tf Parameter Propagation Delay LOW to HIGH Propagation Delay HIGH to LOW Skew, |tPLHDt PHLD| Transition Time LOW to HIGH Transition Time HIGH to LOW Propagation Delay LOW to HIGH Propagation Delay HIGH to LOW Skew, |tPLHt PHL| Rise Time Fall Time 50 pF VDIFF = 2.5V VCM = 0V (Figure 7) (Figures 50 pF Conditions (Figures 2, 3) Min 2 Typ Max Units ns DIFFERENTIAL DRIVER CHARACTERISTICS

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 devices should be operated at these limits. The tables of "Electrical Characteristics" specify conditions for device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 3: All typicals are given for VCC = 5.0V and = 25C. Note = 1 MHz, tr and tf 6 ns. Note 5: ESD Rating: HBM k, 100 pF) all pins 2000V. EIAJ (0, 200 pF) 250V


 

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