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RLC-3: USB to TTL level serial interface converter.

Like a standard USB serial adapter, the RLC-3 is connected to your PC via the standard USB connector, and driver software is installed to make it appear as a new serial port; accessible by any PC software which can talk to a com# port. Com port drivers are automatically installed with Windows XP / Vista (Microsoft WHQL certified) and are available for Macintosh OSX, Linux, WinCE, and Windows 2k / 2k3 / 7.

TTL compatible input / output: Unlike a standard USB serial adapter, the output lines of the RLC-3 are already converted from the RS232 +/- 12 volt level signals to TTL compatible signal levels, making it ideal for communications with microcontrollers like those embedded in ham radios, monitors, and other devices or for your own projects where a PC must "talk" to a microcontroller like the BASIC STAMP, PIC, SX, etc...

Any format: Data formats of 5, 6, 7 and 8 data bits* with 1, 1.5* or 2 stop bits and odd, even, mark, space, or no parity are supported. *at 1M baud, only 7 and 8 data bits are supported *only 5 bit data supported with 1.5 stop bits

Any speed: Baud rate from 300 to 1M (including 300 / 600 / 1200 / 2400 / 4800 / 9600 / 14,400 / 19,200 / 28,800 / 38,400 / 57,600 / 115,200 / 576,000 / 921,600) with a 576 byte receive buffer and a 640 byte transmit buffer promote fast and smooth data transfer. USB 2.0 compliance provides full speed data transfer on the USB side.

Handshaking: Support for X-On/X-OFF. (RTS / CTS pins not accessible)

No power needed: The unit is self powered from the USB port, and can actually supply a small amount of current for a target circuit (500mA at 5V or 26mA at 3.3V).



The pin order on the TTL connector is easy to change. Just slightly pry up the little plastic locking tab, and first push in, then pull out the connector by the wire.

As noted in the table below, plugging things in backwards such that the +5 supply is grounded or so that a data pin is receiving a negative voltage can stress this unit past the point of damage. Please be certain of the signals on the pins of the device you are connected before you plug it in. We recommend a few quick measurements with a multi-meter (commonly available for about the price of the RLC3) with the meters ground lead on what you believe is your devices ground pin, and the meter set to measure low voltages. Then the TX pin of your device should read either 0 or close to +5 volts while the RX pin should "float" or change it's reading especially if you touch the pin with your finger. If you read a negative voltage at any point, then you don't have the ground pin.

Pins 5 and 6 are not supported by the cable, but are present on the device. Pin 5 exposes a Reset signal which will restart the device if pulled low for more than 15uS. Pin 6 provides 3.3 Volts at up to 26mA. Custom units with a 6 pin cable are available. RTS and CTS are not available on this unit at this time.

Absolute Maximum Ratings





Ambient temperature under bias –55 125 °C
Storage Temperature –65 150 °C
Voltage on any I/O Pin or RST with respect to GND –0.3 5.8 Volts
Voltage on VDD with respect to GND –0.3 4.2 Volts
Maximum Total current through VDD and GND 500 mA
Maximum output current sunk by RST or any I/O pin 100 mA
Note: Stresses above those listed here may cause permanent damage to the device. This is a stress rating only,
and functional operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods may affect device reliability.

Global DC Electrical Characteristics







Supply Voltage 3.0 3.3 3.6 V
Supply Current1 Normal Operation;
VREG Enabled
20 26 mA
Supply Current1 Suspended:
VREG Enabled
80 100 ìA
Supply Current - USB Pull-up2 200 228 ìA
Specified Operating Temperature Range –40 +85 °C
Notes: VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified.
1. USB Pull-up Current should be added for total supply current.
2. The USB Pull-up supply current values are calculated values based on USB specifications.

UART and Suspend I/O DC Electrical Characteristics







Output High Voltage IOH = –3 mA
IOH = –10 ìA
IOH = –10 mA
VDD – 0.7
VDD – 0.1

VDD – 0.8

Output Low Voltage IOL = 8.5 mA
IOL = 10 ìA
IOL = 25 mA

Input High Voltage 2.0 V
Input Low Voltage 0.8 V
Input Leakage Current 25 50 ìA
VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified.



file: /Techref/io/serial/RLC3.htm, 12KB, , updated: 2020/12/3 00:44, local time: 2024/7/23 05:39,

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