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RS232 to TTL/CMOS Converters

We designed the TTL-25A RS232 to TTL converter to provide error free full-duplex data communications for TTL and CMOS applications using a 3-wire RS232 interface. Connections are provided for Tx, Rx, Gnd, and +5v sigsnals.

The TTL-25A can operate for both DTE and DCE configurations with the addition of a NULL modem converter for DCE applications.

We designed the CMOS-9-5A/CMOS-9-3A  RS232 to CMOS converters to provide error free full-duplex data communications for your CMOS applications using a 3-wire RS232 interface. Connections are provided for Tx, Rx, Gnd, and +5v sigsnals.

The CMOS-9-5A/CMOS-9-3A can operate for both DTE and DCE configurations with the addition of a NULL modem converter for DCE applications.


Model Interface Style Speed Temperature Documentation Price
TTL-25AL RS232 to TTL DB-25 600 bps to 115200 bps -40°C to +85°C $41.75
CMOS-9-5A RS232 to CMOS DB-9 250 KBPS -40°C to +85°C $36.00
CMOS-9-3A RS232 to CMOS DB-9 250 KBPS -40°C to +85°C $36.00
Model TTL-25AL
TTL-25AL

Model CMOS-9-x
CMOS-9-5A/CMOS-9-3A

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Specifications - Standard Grade RS485 Converters
RS232 Connections DB-25 (TTL-25AL)
DB-9 (CMOS-9-5A / CMOS-9-3A)
TTL/CMOS CMOS 5 position 3.5mm terminals VCC, Unreg, GND, RX, TX
TTL 7 position .200" spaced terminals TX, TX, +5V out, GND
Data Rates TTL-25AL 600 bps to 115200 bps
CMOS-9-5A / CMOS-9-3A 250 KBPS
Signal Settings TTL-25AL RTS Controlled
Transmit Turnaround TTL-25AL Less than 2 μs
Protection Reverse polarity diode protection
Status LED's Yellow Power LED, Bi-Color Green/Red Transmit/Recieve
Power Requirements 7.5 VDC to 24 VDC 45 ma nominal (250 ma dead short) Our PS9CST