UCS-4820H

The UCS-4820H has the following features including High-Voltage Source Outputs;CMOS, PMOS, NMOS, TTL Compatible Inputs;Low-Power CMOS Logic and Latches;Internal Pull-Up/Pull-Down Resistors;Hermetically Sealed Packages to MIL-M-38510;High-Reliability Screening to MIL-STD-883, Class B.

TNTENDED FOR MILITARY, aerospace, and relatea  applications,series USC-4820H 8-bit, serial-input, latched drivers combine bipolar Darlington drivers with MOS logic circuitry (BiMOS) to provide an interface flexibility beyond the reach of standard logic buffers and power driver arrays. Except for the maximum allowable driver output-voltage ratings, Types UCS-4821H (50 V), UCS-4822H (80 V), and UCS-4823H (100 V) are identical. Each driver contains a CMOS shift register and associated latches designed for operation over a 5 V to 15 V supply-voltage range. High-impedance inputs cause minimal loading of data lines and are compatible with standard CMOS, PMOS, and NMOS logic.  When used with standard TTL or Schottky TTL, appropriate pull-up resistors may be required to ensure an input-logic high. The CMOS serial-data output allows cascading these devices for interface applications requiring additional drive lines.The eight high-current bipolar outputs can drive multiplexed LED displays, incandescent lamps,thermal print heads, and (with appropriate clamping techniques) relays, solenoids and other high-power inductive loads. Under normal operating conditions, and without heat sinking, these devices can sustain 200 mA per output at 500C at a 42% duty cycle.Other combinations of number of conducting out-puts, temperature, and duty cycle are shown on the following page.

Information present at an input is transferred to its latch when the STROBE is high. A high CLEAR input will set all latches to the output OFF condition regardless of the data or STROBE input levels. A high OUTPUT ENABLE will set all outputs to the OFF condition, regardless of any other input conditions. When the OUTPUT ENABLE is low, the outputs depend on the state of their respective latches.

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