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