Ch340 Datasheet (I) 1 usb to Serial Port Chip ch340

CH340 Datasheet (I)
2 
Package 
Body size 
Lead pitch 
Description 
Part No. 
SOP-16 
3.9mm 150mil 1.27mm 50mil 
Small outline 16-pin patch 
CH340G 
SOP-16 
3.9mm 150mil 1.27mm 50mil 
Small outline 16-pin patch 
CH340C 
SOP-16 
3.9mm 150mil 1.27mm 50mil 
Small outline 16-pin patch 
CH340B 
SOP-8 
3.9mm 150mil 1.27mm 50mil 
Small outline 8-pin patch 
CH340N 
ESSOP-10 3.9mm 150mil 1.00mm 39mil 
Shrink Small outline 10-pin patch with 
EPAD 
CH340K 
MSOP-10 3.0mm 118mil 0.50mm 19.7mil 
Micro Small outline 10-pin patch 
CH340E 
MSOP-10 3.0mm 118mil 0.50mm 19.7mil 
Micro Small outline 10-pin patch 
CH340X 
SSOP-20 5.3mm 209mil 0.65mm 25mil 
Shrink Small outline 20-pin patch 
CH340T 
SSOP-20 5.3mm 209mil 0.65mm 25mil 
Shrink Small outline 20-pin patch 
CH340R 
Note:
CH340C, CH340N, CH340K, CH340E, CH340X and CH340B have integrated clock, no external crystal 
required. 
CH340B has integrated EEPROM used to configure serial number, some functions can be customized, etc.
CH340K has 3 built-in diodes to reduce current flow backwards between the I/O pins of the MCU. 
The EPAD of CH340K is 0# pin (GND), which is an optional connection; the 3# pin (GND) is the necessary 
connection. 
CH340X is improved based on CH340E, with 5V tolerant characteristic added when the power supply is 
3.3V. 
6# pin of CH340X can be changed from TNOW to DTR# when an external resistor is connected, see Section 
5.3 for the two configurations. 
CH340C whose batch number begins with 4 and last 3-digit greater than B40, 8# pin can be changed to 
DTR# when a 4.7K
Ω
pull-down resistor is connected. 
CH340R provides reverse polarity TXD and MODEM interface signals, discontinued.
The USB transceiver of CH340 is designed according to the built-in design of USB2.0, and it is 

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