The BU34440 is a single-chip 4-bit microcontroller designed for CD-DA and contains parallel I/O, serial I/O, timer/counter, and all other functions required for CD control in a single compact package.
The BU34440 is a single-chip 4-bit microcontroller specifically designed for portable CD-DA devices and stereos. It integrates parallel I/O, serial I/O, timer/counter functions, and all other necessary components for CD control into a compact package.
Key features include low-voltage high-speed operation (2.3V to 5.5V) at up to 4.4MHz, 4k bytes of ROM, and 256 nibbles of RAM. The device supports an internal 8-bit SIO for LSB-first communication and includes programmable pull-up inputs and outputs.
| Operating voltage range | 2.3 ~ 5.5 V |
|---|---|
| ROM size | 4k byte (4096 x 8 bits) |
| RAM size | 256 nibbles (256 x 4 bits) |
| Operating temperature range | -25 ~ +75 C |
| Instruction execution time (1 cycle) | 1.5 usec at 4MHz |
The device operates on a single power supply ranging from 2.3V to 5.5V.
Yes, it contains 4k bytes of ROM and 256 nibbles of RAM.