This document introduces the serial-in / parallel-out driver series products from ROHM, which incorporates a built-in shift register and a latch circuit to control a maximum of 24 LEDs through a 4-line interface connected to a microcontroller. The products feature direct LED driving, maximum 24-bit parallel output, operation on low voltage, and cascade connection capability, making them suitable for AV equipment such as audio stereo sets, videos and TV sets, PCs, and control microcontroller mounted equipment.
The ROHM serial‑in/parallel‑out driver series provides a built‑in shift register and latch circuit to control up to 24 LEDs via a 4‑line interface. The devices operate from low supply voltages (2.7 V‑5.5 V) and support constant‑current LED driving.
Key features include direct LED drive, up to 24 parallel output bits, low‑voltage operation, and optional cascade connections (except for BU2050F, BU2092F, BU2092FV). Typical applications are audio‑visual equipment, PCs and other microcontroller‑based systems.
| Maximum output current | 25 mA (most models) / 50 mA (BD7851FP) |
|---|---|
| Number of parallel output lines | 8, 12, 12, 12, 16, 24 |
| Power supply voltage range | 2.7 V to 5.5 V |
| Operating temperature range | -40 °C to +85 °C |
| Power dissipation (SOP package) | up to 450 mW |
The BD7851FP can source up to 50 mA of output current.
The BU2152FS provides 24 parallel output lines.
They are specified to operate from –40 °C up to +85 °C.
Cascade connection is possible, but not for the BU2050F, BU2092F and BU2092FV models.