Part No.	Internal Clock	Input Voltage	System Clock	Program Memory	Data Memory	Data EEPROM	I/O	Timer		RTC
								8-bit	6-bit
HT45F12	910kHz 2MHz 4MHz 8MHz	2.2V~5.5V	32kHz~12MHz	1Kx15	64x8	32x8	18	1	--	--
	A/D	D/A	PWN	PFD	OPA	Comp.	Interface	Stack	Package
	--	--	--	v	2	2	--	4	16NSOP 20/24SSOP

Part No.	Internal Clock	Input Voltage	System Clock	Program Memory	Data Memory	Data EEPROM	I/O	Timer		RTC
								8-bit	6-bit
HT45F23A HT45F43	910kHz 2MHz 4MHz 8MHz	2.2V~5.5V	400kHz~ 12MHz or 32768Hz	128x8	128x8	64x8	22	1	1	v
	A/D	D/A	PWN	PFD	OPA	Comp.	Interface	Stack	Package
	12-bitx6	12-bitx1	8-bitx2	1	v	2	2	SPI/I2C	16NSOP 20/24SSOP

Note: 1.The internal clock in the table is a fully integrated RC oscillator requiring no external components which can be used as system clock.