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Related Links:

Datasheets:
A6821: DABiC-5 8-Bit Serial Input Latched Sink Drivers (PDF)

Selection Guides:
Power Integrated Circuits,

LED Display Drivers,

Relay/Solenoid Drivers

when this product is updated

Technical Publications:
Product Replacement for the 58xx Family of Serial-Input, Latched Sink Drivers

Press Releases:
A6800 Series: Allegro MicroSystems, Inc. Releases New Latched Sink Drivers

A6821
DABiC-5 8-Bit Serial Input Latched Sink Drivers

Features

• 3.3 V to 5 V logic supply range
• Power on reset (POR)
• To 10 MHz data input rate
• CMOS, TTL compatible
• -40C operation available
• Schmitt trigger inputs for improved noise immunity
• Low-power CMOS logic and latches
• High-voltage current-sink outputs
• Internal pull-up/pull down resistors

Applications

• Multiplexed LED displays
• Incandescent lamps

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. Typical applications include driving multiplexed LED displays or incandescent lamps.

The A6821 has an eight-bit CMOS shift register and CMOS control circuitry, eight CMOS data latches, and eight bipolar current-sinking Darlington output drivers.

The CMOS inputs are compatible with standard CMOS 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.

The A6821SA is furnished in a standard 16-pin plastic DIP. The A6821EA is a 16-pin plastic DIP, capable of operation from -40°C to +85°C. The A6821SLW is a 16-lead wide-body SOIC, for surfacemount applications. These devices are lead (Pb) free, with 100% matte tin plated leadframes.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A6821SA-T	16-pin DIP	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A6821SLW-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A6821SLWTR-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A6821EA-T	16-pin DIP	Yes	view data	-40 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

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.