LA7480 Single-Chip 8-Bit CMOS Microcomputer 5V 7mA IC SDIP-42 Wide
The LA7480 / 7480 family is a compact, low-power single-chip 8-bit CMOS microcomputer intended for embedded control tasks. It combines an 8-bit CPU core with on-chip program/data memory space and multiple built-in peripherals — making it well suited for control panels, timers, sensor interfacing and other small-system automation tasks where cost, board space and power consumption are important. The device supports a crystal/clock input, on-chip I/O ports and internal peripherals required to run control firmware without many external components.
Variants in the 7480/7481 group differ by memory type/size and package but keep the same core peripheral set (timers, serial I/O, A-D converter and watchdog timer), so designers can select the memory/package variant that fits their production needs. Because the family was designed as a CMOS single-chip solution, it offers very low power dissipation (Single-digit mA range under normal clock and supply conditions) and straightforward integration into through-hole SDIP-42 / DIP-42 wide boards used in legacy and repair markets.
Features:
- LA7480 8-bit CMOS CPU core, mask/ROM or ROM less variants available.
- Built-in multi-function I/O ports for simple peripheral interfacing.
- Internal timers and watchdog for reliable embedded control.
- Built-in serial communication interface (UART/clock-synchronized modes).
- On-chip ADC (device variants provide multi-channel A-D).
- Low-power CMOS design suitable for battery-powered and always-on systems.
- Offered in through-hole SDIP-42 (wide) package and other package options.
Specifications:
| Parameter | Specification |
|---|---|
| Architecture | 8-bit single-chip CMOS microcomputer (LA7480 family). |
| Maximum clock | Up to 8 MHz (maximum at VCC = 5.0V). |
| A-D converter | 4 channels (LA7480 group — some family members). |
| Timers | Two 8-bit timers. |
| Serial I/O | 1 × 8-bit serial interface (UART or clock-synchronized). |
| Supply voltage (VCC) | 2.7V to 5.5V (note: some operating modes/clock ranges specify narrower ranges). |
| Power dissipation | ≈ 35mW (measured at 8MHz clock and VCC = 5V). |
| Operating current | ≈ 7mA at 8MHz, VCC = 5V (derived from power dissipation). |
| Package / Pin count | SDIP-42 (wide) / 42-pin DIP variants (through-hole). |
| Operating temperature | See manufacturer datasheet for specific grade — commercial ranges in original. |
| Power-on / reset | External reset input and recommended power sequencing per. |
Pinout:
| Pin | Mode | Name | Input/Output | Function |
|---|---|---|---|---|
| VCC, VSS, AVSS (Note 1) | Single-chip/EPROM | Power source | – | Apply a voltage of 2.7 to 5.5 V to Vcc and 0 V to Vss and AVss. |
| VREF | Single-chip | Reference power input | Input | Reference voltage input pin for A-D converter. |
| EPROM | Mode input | Input | Used as CE input pin. | |
| RESET | Single-chip | Reset input | Input | Reset input pin. |
| EPROM | Reset input | Input | Connect to Vss. | |
| XIN | Single-chip/EPROM | Clock input | Input | These are I/O pins of internal clock generating circuit for the main clock. To control generating frequency, an external ceramic resonator is connected between Xin and Xout pins. If an external clock is used, the clock oscillation source should be connected to the Xin pin, and the Xout pin should be left open. Feedback resistor is connected between Xin and Xout. |
| XOUT | Single-chip/EPROM | Clock output | Output | |
| P00 – P07 | Single-chip | I/O port P0 | I/O | 8-bit I/O port. The output structure is CMOS output. When this port is selected for input, a pull-up transistor can be connected in units of 1 bit, and a key-on wake-up function is provided. |
| EPROM | Data 8-bit (D0 to D7) | I/O | Data 8-bit (D0 to D7) I/O pins | |
| P10 – P17 | Single-chip | I/O port P1 | I/O | 8-bit I/O port. The output structure is CMOS output. When this port is selected for input, a pull-up transistor can be connected in units of 4 bits. P12 and P13 are in common with timer output pins T0 and T1. P14, P15, P16 and P17 are in common with serial I/O pins RxD, TxD, SCLK and SRDY. |
| EPROM | Address input A4 – A10 | Input | P11 to P17 are address (A4 to A10) input pins. Leave P10 open. | |
| P20 – P27 (Note 2) | Single-chip | Input port P2 | Input | 8-bit input port. This port is in common with analog input pins IN0 to IN7 (IN0 to IN3 for the 7480 group). |
| EPROM | Address input A0 – A3 | Input | P20 to P23 are address (A0 to A3) input pins. Leave P24 to P27 open. | |
| P30 – P33 | Single-chip | Input port P3 | Input | 4-bit input port. P30 and P31 are in common with external interrupt input pins INT0 and INT1. |
| EPROM | Address input A11, A12, mode input, VPP input | Input | P30 and P31 are address (A11, A12) input pins. P32 is used for OE input. P33 is VPP input. Apply VPP in the program and program verify modes. | |
| P40 – P43 (Note 3) | Single-chip | I/O port P4 | I/O | 4-bit I/O port. The output structure is N-channel open drain output, having built-in clamp diode. P40 and P41 are in common with timer input pins CNTR0 and CNTR1. |
| EPROM | Address input A13, A14 | Input | P40 and P41 are address (A13, A14) input pins. Leave P42 and P43 open. | |
| P50 – P53 (Note 4) | Single-chip | I/O port P5 | I/O | 4-bit I/O port. The output structure is N-channel open drain output, having a built-in clamp diode. |
| EPROM | Loaded data P6 | Load | Leave these pins open. |
Applications:
- Automotive control modules (non-safety critical functions).
- Home appliances (timers, user interfaces, motor control sub-systems).
- Office automation and small industrial controllers.
- Legacy system repair / retrofitting where through-hole SDIP-42 parts are used.
- Educational and hobbyist embedded projects that require simple MCU features.
Packages:
- 1x LA7480 Single-Chip 8-Bit CMOS Microcomputer 5V 7mA IC SDIP-42 Wide.
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