General Description
The DM134B、DM135B are constant current drivers specifically designed for LED display applications. The value of constant current can be varied using an external resistor. The devices include a 16-bit shift register, latches, and constant current drivers on a single Silicon CMOS chip.

FEATUREs
• 3.3V~5V CMOS Compatible Input
• Maximum Clock Frequency: 25MHz (Cascade Operation)
• Maximum Output Voltage: 17V
• Package: DIP24, SOP24, SSOP24, QFN32
• Package and Pin Layout: Pin layout and functionality are similar to those of the ST2221C.
                    (Each characteristic value is different.)
• Constant Current Matching: (Ta = 25°C、VDD = 5.0V)
                                         Chip-to-Chip: ± 10.0%
                                         Bit-to-Bit:
                                             DM134B:± 4.0% @ IOUT = 30 ~ 90mA
                                                         ± 6.0% @ IOUT = 20 ~ 30mA
                                             DM135B:± 4.0% @ IOUT = 20 ~ 60mA
                                                         ± 6.0% @ IOUT = 5 ~ 20mA