CH340N
USB to Serial Bridge ICThe CH340N is a usb to serial bridge ic from WCH. View the full CH340N datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
Official CH340N datasheet (PDF) — the source this page was extracted from.
CH340N Key Specifications
| Parameter | Value |
|---|---|
| Clock | Built-in, no external crystal required |
| Baud Rate | 50bps to 2Mbps |
| Pin Count | 8 |
| Pin Pitch | 1.27mm |
| Body Width | 3.9mm |
| USB Interface | Full-speed USB 2.0 device |
| Supply Voltage | 3.3V or 5V |
| Serial Interface | UART, hardware full-duplex |
| Handshake Signals | RTS, DTR (SOP-8 pinout) |
| Receive Baud Rate Error | ~2% |
| Transmit Baud Rate Error | <1.8% |
CH340N Overview
Part: W25Q80BV — Winbond
Type: Serial Flash Memory
Description: 8M-bit (1M-byte) Serial Flash memory with Dual and Quad SPI support, operating from 2.7V to 3.6V, featuring 80MHz clock speeds for up to 320MHz equivalent Quad I/O performance, and a wide operating temperature range for automotive and industrial applications.
Operating Conditions:
- Supply voltage: 2.7V to 3.6V
- Operating temperature: -40°C to +85/105/125°C
- SPI clock frequency: Up to 80MHz
Absolute Maximum Ratings:
Key Specs:
- Memory capacity: 8M-bit (1,048,576 bytes)
- Page size: 256 bytes
- Erase/Program cycles: >100,000 (Industrial temp), >10,000 (AEC-Q100 compliant)
- Data retention: >20 years
- Active current: 4mA
- Power-down current: <1μA
- Continuous data transfer rate: 40MB/S
Features:
- Standard, Dual, and Quad SPI interfaces
- Flexible architecture with 4KB sectors
- Uniform Sector/Block Erase (4/32/64K-bytes)
- Erase/Program Suspend & Resume
- Software and Hardware Write-Protect
- 64-Bit Unique Serial Number
- Discoverable Parameters (SFDP) Register
- 3x256-Byte Security Registers with OTP locks
Applications:
- Code shadowing to RAM
- Executing code directly from Dual/Quad SPI (XIP)
- Storing voice, text and data
- Automotive & Industrial Plus Grades
Package:
- 8-pin SOIC 150-mil (SN)
- 8-pin SOIC 208-mil (SS)
- 8-pad WSON 6x5-mm (ZP)
- 8-pad USON 2x3-mm (UX)
CH340N Features
- Family of SpiFlash Memories
- W25Q80BV: 8M-bit/1M-byte (1,048,576)
- 256-byte per programmable page
- Standard SPI: CLK, /CS, DI, DO, /WP, /Hold
- Dual SPI: CLK, /CS, IO0, IO1, /WP, /Hold
- Quad SPI: CLK, /CS, IO0, IO1, IO2, IO3
CH340N Pin Configuration
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | UD+ | USB Signal | Directly connected to the D+ data line of the USB bus, do not connect series resistors |
| 2 | UD- | USB Signal | Directly connected to the D- data line of the USB bus, do not connect series resistors |
| 3 | GND | Power | Common ground, directly connected to the ground line of the USB bus |
| 4 | RTS# | Output | MODEM handshake output signal, Request To Send, active low (high) |
| 5 | VCC | Power | Positive power supply input, requires external 0.1μF power decoupling capacitor |
| 6 | TXD | Output | Serial data output (CH340R model is inverted output) |
| 7 | RXD | Input | Serial data input, built-in controllable pull-up and pull-down resistors |
| 8 | V3 | Power | Connect to VCC input external power supply when using 3.3V power voltage, connect external 0.1μF decoupling capacitor when using 5V power voltage |
CH340N Electrical Characteristics
| PARAMETER | SYMBOL | CONDITIONS | SPEC | SPEC | SPEC | UNIT |
|---|---|---|---|---|---|---|
| PARAMETER | SYMBOL | CONDITIONS | MIN | TYP | MAX | UNIT |
| Input Capacitance | CIN (1) | VIN = 0V (1) | 6 | pF | ||
| Output Capacitance | Cout (1) | VOUT = 0V (1) | 8 | pF | ||
| Input Leakage | I LI | ±2 | μA | |||
| I/O Leakage | ILO | ±2 | μA | |||
| Standby Current | ICC1 | /CS = VCC, VIN = GND or VCC | 25 | 50 | μA | |
| Power-down Current | ICC2 | /CS = VCC, VIN = GND or VCC | 1 | 10 | μA | |
| Current Read Data / Dual /Quad 1MHz (2) | ICC3 | C = 0.1 VCC / 0.9 VCC DO = Open | 4/5/6 | 10 | mA | |
| Current Read Data / Dual /Quad 33MHz (2) | ICC3 | C = 0.1 VCC / 0.9 VCC DO = Open | 6/7/8 | 12 | mA | |
| Current Read Data / Dual /Quad 50MHz (2) | ICC3 | C = 0.1 VCC / 0.9 VCC DO = Open | 7/8/9 | 14 | mA | |
| Current Read Data / Dual Output Read/Quad Output Read 80MHz (2) | ICC3 | C = 0.1 VCC / 0.9 VCC DO = Open | 10/11/12 | 18 | mA | |
| Current Write Status Register | ICC4 | /CS = VCC | 8 | 15 | mA | |
| Current Page Program | ICC5 | /CS = VCC | 20 | 30 | mA | |
| Current Sector/Block Erase | ICC6 | /CS = VCC | 20 | 30 | mA | |
| Current Chip Erase | ICC7 | /CS = VCC | 20 | 30 | mA | |
| Input Low Voltage | VIL | VCC x 0.3 | V | |||
| Input High Voltage | VIH | VCC x 0.7 | V | |||
| Output Low Voltage | VOL | IOL = 100 μA | 0.2 | V | ||
| Output High Voltage | VOH | IOH = -100 μA | VCC - 0.2 | V |
-
Tested on sample basis and specified through design and characterization data. TA = 25° C, VCC = 3V.
-
Checker Board Pattern.
CH340N Absolute Maximum Ratings
| PARAMETERS | SYMBOL | CONDITIONS | RANGE | UNIT |
|---|---|---|---|---|
| Supply Voltage | VCC | -0.6 to +4.6 | V | |
| Voltage Applied to Any Pin | VIO | Relative to Ground | -0.6 to VCC+0.4 | V |
| Transient Voltage on any Pin | VIOT | <20nS Transient Relative to Ground | -2.0V to VCC+2.0V | V |
| Storage Temperature | TSTG | -65 to +150 | ° C | |
| Lead Temperature | TLEAD | See Note (2) | ° C | |
| Electrostatic Discharge Voltage | VESD | Human Body Model (3) | -2000 to +2000 | V |
- This device has been designed and tested for the specified operation ranges. Proper operation outside of these levels is not guaranteed. Exposure to absolute maximum ratings may affect device reliability. Exposure beyond absolute maximum ratings may cause permanent damage.
- Compliant with JEDEC Standard J-STD-20C for small body Sn-Pb or Pb-free (Green) assembly and the European directive on restrictions on hazardous substances (RoHS) 2002/95/EU.
- JEDEC Std JESD22-A114A (C1=100pF, R1=1500 ohms, R2=500 ohms).
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Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.
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