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Related Links:

Datasheets:
5821: BiMOS II 8-Bit Serial-Input, Latched Drivers (PDF)

Selection Guides:
LED Display Drivers,

Relay/Solenoid Drivers

when this product is updated

UCx5821
BiMOS II 8-Bit Serial-Input, Latched Drivers

The UCx5821 has been phased out of production as of October 31, 2005.

For samples and information on the replacement part, please refer to the A6821.

Features

• To 3.3 MHz Data Input Rate
• CMOS, NMOS, TTL Compatible
• Internal Pull-Down Resistors
• Low-Power CMOS Logic and Latches
• High-Voltage Current-Sink Outputs
• Automotive Capable

Description

A merged combination of bipolar and MOS technology gives these devices an interface flexibility beyond the reach of standard logic buffers and power driver arrays. The UCN5821A and UCN5821LW each have an eight-bit CMOS shift register and CMOS control circuitry, eight CMOS data latches, and eight bipolar current-sinking Darlington output drivers.

BiMOS II devices have much higher data-input rates than the original BiMOS circuits. With a 5 V logic supply, they will typically operate at better than 5 MHz. With a 12 V supply, significantly higher speeds are obtained. The CMOS inputs are compatible with standard CMOS and NMOS logic levels. TTL circuits may require the use of appropriate pull-up resistors. By using the serial data output, the drivers can be cascaded for interface applications requiring additional drive lines.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
UCN5821A	16-pin DIP	No	view data	-20 °C to  85 °C	discontinued	samples not available
UCN5821LW	16-lead SOIC	No	view data	-20 °C to  85 °C	discontinued	samples not available
UCN5821LWTR	16-lead SOIC	No	view data	-20 °C to  85 °C	discontinued	samples not available
UCQ5821A	16-pin DIP	No	view data	-40 °C to  85 °C	discontinued	samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.