HD44750

The HD44750 is designed as the CMOS 4-bit single chip microcomputer which contains ROM, RAM, IO and timer/event counter on single chip. HD44750 is designed to perform efficient controller function as well as arithmetic function for both binary and BCD data. The CMOS technology of it provides the flexibility of microcomputers for battery powered and battery back-up applications.

HD44750 has many features and some are listed here. (1)4-bit architecture. (2)1024 words of program ROM (10bits /word) and 64 words of pattern ROM (10bits /word). (3)80 digits of data RAM (4 bits/digit). (4)32 IO lines and 2 external interrupt lines. (5)Timer/event counter. (6)Instruction cycle time 10us. (7)All instructions except one instruction, single word and single cycle. (8)BCD arithmetic instructions. (9)Pattern generation instructions. (10)Powerful interrupt function. (11)Bit manipulation instructions for both RAM and IO. (12)Option of IO configuration selectable on each pin; pull up MOS or CMOS or open drain. (13)Built-in oscillator. (14)CMOS technology. And so on.

Some absolute maximum ratings of HD44750 have been concluded into several points as follow. (1)Its supply voltage would be from -0.3V to +7.0V. (2)Its pin voltage would be from -0.3v to Vcc+0.3V except for pins specified by V12 and would be from -0.3V to +10V applied to open drain output pins. (3)Its maximum total output current would be 45mA. (4)Its operating temperature range would be from -20°C to +75°C. (5)Its storage temperature range would be from -55°C to +125°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics of HD44750 are concluded as follow. (1)Its input low voltage would be max 1.0V. (2)Its input high voltage would be min Vcc-1.0V and max Vcc. (3)Its output low voltage would be max 0.8V. (4)Its output high voltage would be min 2.4V. (4)Its interrupt input hold time would be min 2Tinst us. (5)Its interrupt input fall time would be max 50us. (6)Its interrupt input rise time would be max 50us. And so on. If you have any question or suggestion or want to know more information about HD44750,  please contact us for details. Thank you!