W74 - Brand New Texas Instruments IC Chips
In Stock:2075 ,Ready for Immediate Shipping
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In Stock:
2075,
Ready for Immediate Shipping
Brand:Texas Instruments
Category:IC Chips
Chipdatas Part No.:CD91-W74
Manufacturer Part No.:W74
Datecode:09+
Package:SM-8
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Description
The W74 is a high-performance 4-bit microcontroller (mC) that features a built-in 640-dot LCD driver. It offers a 4-bit ALU, two 8-bit timers, two dividers in dual-clock operation, a 40 ´ 16 LCD driver, ten 4-bit I/O ports (including 2 output ports for LED driving), a multiple frequency output, and one channel DTMF generator. With low power consumption, it also includes three power reduction modes: hold mode, stop mode, and slow mode.
Specifications and features
- Operating Voltage: 2.4V – 5.5V for mask type, 2.4V – 4.8V for electrical erasable EPROM type
- Dual-clock Operation
- Main Oscillator: 3.58 MHz or 400 KHz can be selected by code option, Crystal or RC oscillator can be selected by code option
- Sub-oscillator: Connect to 32.768 KHz crystal only
- Memory:
- 16384(16K) x 16 bit program ROM (including 64K x 4 bit look-up table)
- 5120(5K) x 4 bit data RAM (including 16 nibbles x 16 pages working registers)
- 40 x 16 LCD data RAM
- 40 Input/Output Pins:
- Port for input only: 3 ports/12 pins
- Input/output ports: 3 ports/12 pins
- High sink current output port for LED driving: 2 port /8 pins
- DC output port: 2 ports/ 8 pins (selected by code option)
- Power-down Mode:
- Hold mode: no operation (main oscillator and sub-oscillator still operate)
- Stop mode: no operation (main oscillator and sub-oscillator are stopped)
- Slow mode: main oscillator is stopped, system is operated by the sub-oscillator (32.768 KHz)
- Eleven Interrupt Sources:
- Four internal interrupts (Divider0, Divider1, Timer 0, Timer 1)
- Seven external interrupts (RC.0-3, P1.2 (INT0), Serial Port, P1.3 (INT1))
- LCD Driver Output:
- 40 segments x 16 commons
- 1/8 or 1/16 duty (selected by code option) 1/5 bias driving mode
- Clock source should be the sub-oscillator clock in the dual-clock operation mode
- 8 level software LCD contrast adjusting
- LCD operating voltage source could come from VDD or VLCD1 pin input
- MFP Output Pin:
- Output is software controlled to generate modulating or nonmodulating frequency
- Works as frequency output specified by Timer 1
- Key tone generator
- DTMF Output pin: Output is one channel Dual Tone Multi-Frequency signal for dialling
- 8-bit Serial I/O Interface: 8-bit transmit/receive mode by internal or external clock source
- Two Built-in 14-bit Frequency Dividers:
- Divider0: the clock source is the main oscillator (Fosc)
- Divider1: the clock source is the sub-oscillator (Fs)
- Two Built-in 8-bit Programmable Countdown Timers:
- Timer 0: one of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected
- Timer 1: with auto-reload function and one of two internal clock frequencies (FOSC or FOSC/64 or Fs) can be selected (signal output through MFP pin)
- Built-in 18/15-bit Watchdog Timer Selectable for System Reset, Enable/Disable by Code Option
- Powerful Instruction Set
- 16-level Stack Buffer
- Packaged in 100-pin QFP
Application Scenarios
The W74 microcontroller can be used in various applications, including but not limited to:
- Consumer Electronics
- Industrial Automation
- Home Appliances
- Smart Grid Systems
Comparison
Advantages:
- High-performance 4-bit microcontroller with built-in 640-dot LCD driver
- Low power consumption with three power reduction modes
- Multiple frequency output and channel DTMF generator
- Various input/output pins for versatile connectivity
- Flexible clock options and memory capabilities
Disadvantages:
- Limited to 4-bit architecture
- 100-pin QFP package may require specialized PCB design
- Not suitable for applications requiring higher processing power
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Additional Information
- Datasheet: Download W74
- Chipdatas Part: CD91-W74
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
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- Last Updated: 2024/06/03 16:19 +0800
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