DESCRIPTION
The SM5K3/5K4/5K5 are CMOS 4-bit single-chip microcomputers incorporating 4-bit parallel processing function, ROM, RAM, 10-bit A/D converter and timer/counters.
It provides three kinds of interrupts and 4 levels subroutine stack. Being fabricated through CMOS process, the chip requires less power and available in a small package : best suitable for Low power controlling, compact equipment like a precision charger.

FEATURES
• ROM capacity : 2 048 x 8 bits
• RAM capacity : 128 x 4 bits
• Instruction sets : 50
• Subroutine nesting : 4 levels
• I/O port :
    Input 8
    Output 4
    Input/output 12 (36QFP/32SOP)
                        11 (30SDIP)
                          8 (28SOP)
    • Interrupts :
    Internal interrupt x 1 (timer)
    External interrupt x 2 (2 external interrupt inputs)
• A/D converter :
    Resolution 10 bits
    Channels 4
• Timer/counter : 8-bit x 1
• Built-in main clock oscillator for system clock
    Ceramic/crystal oscillator (SM5K3/5K5)
    CR oscillator (SM5K4)
• Signal generation for real time clock∗ (SM5K3/5K5)
• Built-in 15 stages divider (for real time clock∗ : SM5K3/5K5)
• Instruction cycle time :
    1 µs (MIN.) (2 MHz, at 5 V ± 10%) (SM5K3/5K5)
    2 µs (MIN.) (1 MHz, at 2.2 to 5.5 V) (SM5K3/5K5)
    1 µs (MIN.) (1.67 MHz ± 20%, at 5 V ± 10%) (SM5K4)
• Large current output pins (LED direct drive) : 15mA (TYP.) x 4 (sink current)
• Supply voltages :
    2.2 to 5.5 V (SM5K3/5K5)
    2.7 to 5.5 V (SM5K4)
• Packages :
    30-pin SDIP (SDIP030-P-0400)
    32-pin SOP (SOP032-P-0525)
    36-pin QFP (QFP036-P-1010)
    28-pin SOP (SOP028-P-0450) (SM5K3/5K5)
    24-pin SSOP (SSOP024-P-0275) (SM5K4)