CH341A Datasheet – USB Bus Convert Chip (SOP 28)

This is one of the Convert Chip types.

Part Number : CH341A

Function  : USB Bus Convert Chip

Package : SOP 28 Pin

Manufactures : Jiangsu QinHeng ( )


CH341A USB Bus Convert Chip


CH341 is a USBbus convert chip, providing UART, printerport, parallel and synchronous serial with 2-wire or4-wire through USBbus. In UART mode, CH341 provides alternant rate control signals such as serial transfer enable, serial receive in ready etc. It also supplies common MODEM communication signal in order to expand UART for computer orupgrade common synchronous interface device to USB bus directly.

In printer port mode, CH341 supplies standard USB printerport which compounds USB relevant protocol and Windows operate system used toupgrade ordinary parallel printer to USB bus directly. In parallel mode, CH341 gives out8-bit parallel in EPP or MEM mode. It canbe used to input/output data directly without MCU/DSP.

CH341A Pinout

CH341A datasheet pdf


1. Full speed USB device interface, conforms to USB Specification Version2.0, only needs crystal and capacitance external.

2. Optional:define Vender ID, production ID and listnumber through external low-cost serial EEPROM.

3. Supports5V and3.3Vpower source.

4. Low-cost, directly convert serial peripheral equipment, parallel printer and parallel peripheral

CH341A Datasheet


SDA2121-2 Datasheet PDF – PLL WITH I2C BUS

Part Number : SDA2121-2


Package : DIP-20, DSO-20 Type

Manufacturers : Siemens AG

Pinouts :

SDA2121-2 datasheet


Description :

The SDA2121-2 is an integrated circuit in CMOS technoloty which has been especially designed for application in radio equipment.

1. High input sensitivity ( 50 mVrms on FM and 30 mVrms on AM )
2. High input frequencies ( 150 MHz on FM and 25 MHz on AM )
3. Extremely fast phase detector with very short anti-backlash pulses
4. I2C bus
5. Switchable phase detector polarity
6. Open drain switching outputs for 10 V

Block Diagram

Other data sheets within the file : Q67100-H5025, Q67100-H5026, SDA2121-2X

SDA2121-2 Datasheet PDF Download

SDA2121-2 pdf