MIC5821/5822 8-Bit Serial-Input Latched Drivers - Micrel - #1

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February 2005 1 MIC5821/5822 MIC5821/5822 Micrel, Inc. MIC5821/5822 8-Bit Serial-Input Latched Drivers Final Information General Description BiCMOS technology gives the MIC5821/5822 family flexibility beyond the reach of standard logic buffers and power driver arrays. These devices each have an eight-bit CMOS shift register, CMOS control circuitry, eight CMOS data latches, and eight bipolar current-sink Darlington output drivers. The 500mA outputs are suitable for use with incandescent bulbs and other moderate to high current loads. The drivers can be operated with a split supply where the negative supply is down to –20V. Except for maximum driver output voltage ratings, the MIC5821 and MIC5822 are identical. These devices have greatly improved data-input rates. With a 5V logic supply they will typically operate faster than 5 MHz. With a 12V supply significantly higher speeds are obtained. The CMOS inputs are compatible with standard CMOS, PMOS, and NMOS logic levels. TTL and DTL 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. Features • 3.3 MHz Minimum Data-Input Rate • CMOS, PMOS, NMOS, TTL Compatible • Internal Pull-Down or Pull-Up Resistors • Low-Power CMOS Logic and Latches • High-Voltage Current-Sink Outputs • Single or Split Supply Operation 8-BIT SERIAL-PARALLEL SHIFT REGISTER 5 SERIAL DATA OUT CLK 1 2 3 SERIAL DATA IN VSS 9 VDD STROBE OUTPUT ENABLE (ACTIVE LOW) Bipolar MOS LATCHES OUT8 16 15 14 13 12 11 10 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 4 6 7 Sub GND VEE 8 Functional Diagram Pin Configuration 1 2 3 4 5 6 7 12 11 10 9 VDD OUT1 OUT2 OUT3 OUT4 CLOCK SERIAL DATA OUT VSS 8 13 14 15 OUT5 OUT6 OUT7 OUT8 SERIAL DATA IN STROBE OUTPUT ENABLE SUB VEE 16 LATCHES SHIFT REGISTER (Plastic DIP) Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com Ordering Information Part Number Standard Pb-Free Temp Range Package MIC5821BN MIC5821YN –40°C to +85°C 16-Pin Plastic DIP MIC5822BN MIC5822YN –40°C to +85°C 16-Pin Plastic DIP