Part No. VDD System
Clock		 Program Memory Data Memory Data EEPROM I/O

RTC

 Interrupt  
Ext. Int.
HT46F21* 2.2V~
5.5V		 400kHz~
12MHz or 32768Hz		 1Kx14 64x8 32x8 18 v 2 9  

HT46F22*

 2.2V~
5.5V		 400kHz~
12MHz or 32768Hz		 2Kx14 96x8 64x8 22 v 2 9  
HT46F22U*
HT46F23* 2.2V~
5.5V		 400kHz~
12MHz or 32768Hz		 4Kx15 192x8 128x8 42 v 2 9  to continue ...
HT46F23U*

HT46F24*

 2.2V~
5.5V		 400kHz~
12MHz or 32768Hz		 8Kx16 384x8 256x8 42 v 2 9  
HT46F24U*
HT46F25* 2.2V~
5.5V		 400kHz~
12MHz or 32768Hz		 12Kx16 576x8 256x8 50 v 4 11  
HT46F25U*
  Part No. A/D TPU PFD Comp. Interface Stack Package
  HT46F21* 12-bitx8 10-bit STPUx1,
10-bit GTPUx1		 v 2 SPI/I2C 4 16DIP/NSOP/SSOP,
20DIP/SOP/SSOP
 

HT46F22*

 12-bitx8 10-bit STPUx1,
10-bit ETPUx1		 v 2 SPI/I2C 4 16DIP/NSOP/SSOP,
20DIP/SOP/SSOP,
24SKDIP/SOP/SSOP
HT46F22U* UART
 to continue ... HT46F23* 12-bitx8 10-bit STPUx1,
10-bit ETPUx1,
16-bit GTPUx1		 v 2 SPI/I2C 8 24/28SKDIP/SOP/SSOP,
44QFP,
32/40/48QFN
HT46F23U* UART 44QFP,
40/48QFN
 

HT46F24*

 12-bitx8 10-bit STPUx2,
10-bit ETPUx1,
16-bit GTPUx1		 v 2 SPI/I2C 8 28SKDIP/SOP/SSOP,
44QFP,
40/48QFN
HT46F24U* UART 44QFP,
48QFN
  HT46F25* 12-bitx12 10-bit STPUx2,
10-bit ETPUx1,
16-bit GTPUx1		 v 2 SPI/I2C 12 44/52QFP,
40/48QFN
HT46F25U* UART

* Under development, available in 1Q, 2009.
Note: Part number with an "U" suffix have a UART interface.