ST2221A Datasheet | SiTI

Description The ST2221A is specifically designed for LED and LED DISPLAY constant current drivers. The value of constant current can be varied using an external resistor (Iout = 5 ~90m A). The devices include an 8-bit shift registers, latches, and constant current drivers on a single Silicon CMOS chip. Features z Constant Current Output : Current with one resistor for 5m A to 90m A z Maximum Clock Frequency : 25MHz (Cascade Operation) z 5V CMOS patible Input z Package : PDIP16,SOP16,SSOP16 z Constant Current Matching: (Ta = 25°C、VDD = 5.0V) Bit-to-Bit : ± 6%、Chip-to-Chip : ± 10%、 @ IOUT = 5 ~ 40m A Bit-to-Bit : ± 6%、Chip-to-Chip : ± 10%、 @ IOUT = 40 ~ 90m A 8-BIT CONSTANT CURRENT LED DRIVERS Version:A.036 Page: 1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Pin Connection (Top view) GND SERIAL-IN CLOCK LATCH OUT0 OUT1 OUT2 OUT3 1 2 3 4 5 6 7 8 16 VDD 15 R-EXT 14 SERIAL-OUT 13 ENABLE 12 OUT7 11 OUT6 10 OUT5 9 OUT4 Block Diagram R-EXT OUT0 OUT1 I-REG. ENABLE LATCH SERIAL-IN CLOCK Q ST D Q ST D DQ CK DQ CK OUT7 Q ST D DQ CK DQ CK SERIAL-OUT 8-BIT CONSTANT CURRENT LED DRIVERS Version:A.036 Page: 2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Timing...