ST2221C Datasheet | SiTI

Description The ST2221C 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 a 16-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 : DIP24 , SOP24, SSOP24 z Constant Current Matching: (Ta = 25°C、VDD = 5.0V) Bit-to-Bit: ± 6.0%、Chip-to-Chip : ± 10.0%、 @ IOUT = 5 ~ 90m A 16-Bit Constant Current LED Drivers -1- Version：A.004 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 OUT4 OUT5 OUT6 OUT7 1 2 3 4 5 6 7 8 9 10 11 12 24 VDD 23 R-EXT 22 SERIAL-OUT 21 ENABLE 20 OUT15 19 OUT14 18 OUT13 17 OUT12 16 OUT11 15 OUT10 14 OUT9 13 OUT8 Block Diagram R-EXT OUT0 OUT1 I-REG. OUT15 ENABLE LATCH SERIAL-IN CLOCK Q ST D Q ST D DQ CK DQ CK Q ST D DQ CK DQ CK SERIAL-OUT 16-Bit Constant Current LED Drivers -2- Version：A.004 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Timing...