August 2010 Doc ID 7512 Rev 7 1/13
1
ST3222B
ST3222C
3 to 3.6 V, low power, up to 400 kbps
RS-232 drivers and receivers
Features
■ 300 µA supply current
■ 250 kbps minimum guarantee data rate
■ 6 V/µs minimum guarantee slew rate
■ Meet EIA/TIA-232 specification down to 3 V
Description
The ST3222 is a 3 V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements and high data-rate
capabilities. ST3222 has a proprietary low
dropout transmitter output stage providing true
RS-232 performance from 3 to 3.6 V power
supplies. The device requires only four small 0.1
mF standard external capacitors for operating
from 3 V supply. The ST3222 has two receivers
and two drivers. The ST3222 features a 1 mA
shutdown mode that reduces power consumption
and extends battery life in portable systems. Its
receivers can remain active in shutdown mode,
allowing external devices such as modems to be
monitored using only 1 mA supply current. The
device is guaranteed to run at data rates of
250 Kbps while maintaining RS-232 output levels.
Typical applications are notebooks, sub-
notebooks and palmtop computers, battery
powered equipment, hand-held equipment,
peripherals and printers.
TSSOP20
Table 1. Device summary
Order codes
Temperature
range
Package Packaging
ST3222CTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel
ST3222BTR -40 to 85 °C TSSOP20 (tape and reel) 2500 parts per reel
www.st.com
