|Category||Interface and Interconnect => RS-422/RS-423|
|Description||DS8922 - Tri-state RS-422 Dual Differential Line Drivers And Receiver Pair, Package: Soic Narrow, Pin Nb=16|
|Company||National Semiconductor Corporation|
|Datasheet||Download DS8922 datasheet
|DS8922/DS8922A/DS8923A TRI-STATE RS-422 Dual Differential Line Driver and Receiver Pairs
DS8922/DS8922A/DS8923A TRI-STATE ® RS-422 Dual Differential Line Driver and Receiver Pairs
The DS8922/22A and DS8923A are Dual Differential Line Driver and Receiver pairs. These devices are designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, the devices meet the requirements of the EIA Standard RS-422. These devices 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. An input fail-safe circuit is provided such that if the receiver inputs are open the output assumes the logical one state. The DS8922A and DS8923A 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. Both devices feature TRI-STATE outputs. The DS8922/22A have independent control functions common to a driver and receiver pair. The DS8923A has separate driver and receiver control functions. Power up/down circuitry is featured which will TRI-STATE the outputs and prevent erroneous glitches on the transmission lines during system power up or power down operation. The DS8922/22A and DS8923A are designed to be compatible with TTL and CMOS.Features
12 ns typical propagation delay Output skew 0.5 ns typical Meets 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 Receiver input fail-safe circuitry Receiver input hysteresis 70 mV typical Glitch free power up/down TRI-STATE outputsTRI-STATE is a registered trademark of National Semiconductor Corp.
EN2 RO1 ACTIVE HI-Z ACTIVE HI-Z RO2 ACTIVE HI-Z DO1 ACTIVE HI-Z ACTIVE HI-Z DO2 ACTIVE HI-Z
DEN REN RO1 ACTIVE HI-Z RO2 ACTIVE HI-Z DO1 ACTIVE HI-Z ACTIVE HI-Z DO2 ACTIVE HI-Z ACTIVE HI-Z
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Drive 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 1300 mW
N Package 1450 mW Derate M Package 10.4 mW/°C above +25°C Derate N Package 11.6 mW/°C above +25°C Storage Temperature Range to +165°C Lead Temp. (Soldering, 4 seconds) 260°C
Symbol RECEIVER VTH VHYST RIN IIN VOH VOL ISC DRIVER VOH VOL IOFF |VT|| | VT |VOS VOS | ISC IOZ TRI-STATE Leakage ICC VCC = MAX ACTIVE TRI-STATE DRIVER and ENABLE INPUTS VIH VIL IIL IIH II VCL
Conditions -7V VCM +7V -7V VCM -7V, +7V (Other Input = GND) VIN = 10V VIN CC = MIN, IOH CC = MAX, IOL 8 mA
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