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Table Of Contents

August 2010 Doc ID 7512 Rev 7 1/13

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

Summary of content (13 pages)

PAGE 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 TSSOP20 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.
PAGE 2
Contents ST3222B - ST3222C Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 4 Receiver electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application . . . . . . . . . . . . .
PAGE 3
ST3222B - ST3222C Pin configuration 1 Pin configuration Figure 1. Pin connections CS02220 Table 2. Pin descriptions Pin n° Symbol Name and function 1 EN Receiver enable control. Drive low for normal operation. Drive high to force the receivers outputs (R_OUT) into a high-impedance state. 2 C1+ Positive terminal for the first charge pump capacitor 3 V+ 5.5 V Generated by the charge pump.
PAGE 4
Maximum ratings ST3222B - ST3222C 2 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit -0.3 to 6 V VCC Supply voltage V+ Doubled voltage terminal (VCC - 0.3) to 7 V V- Inverted voltage terminal 0.3 to -7 V 13 V -0.3 to 6 V ± 25 V ± 13.2 V -0.3 to (VCC + 0.
PAGE 5
ST3222B - ST3222C Electrical characteristics 3 Electrical characteristics Table 4. Electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter ISUPPLY VCC power supply current No load VCC = 3.3 V SHDN = VCC SHUTDOWN supply current No load VCC = 3.3V SHDN = GND ISHDN Table 5. Symbol Test conditions Parameter Max. Unit TA = 25 °C 0.
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Electrical characteristics ST3222B - ST3222C 3.1 Receiver electrical characteristics Table 7. Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions IOL Output leakage current VRIN Receiver Input voltage operating range VRIL Input threshold low TA = 25 °C, VCC = 3.3 V VRIH Input threshold high TA = 25 °C, VCC = 3.
PAGE 7
ST3222B - ST3222C 4 Application Application Figure 2. Application circuits CS02200 Table 9. Capacitance value (µF) C1 C2 C3 C4 Cbypass 0.1 0.1 0.1 0.1 0.
PAGE 8
Application 4.1 Figure 3. Figure 5. 8/13 ST3222B - ST3222C Typical performance characteristics (unless otherwise specified TJ = 25 °C) Figure 4. Driver voltage transfer characteristics for transmitter inputs Driver voltage transfer characteristics for receiver inputs Output current vs. output low voltage Output current vs. output high voltage Figure 6.
PAGE 9
ST3222B - ST3222C 5 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
PAGE 10
Package mechanical data Table 10. ST3222B - ST3222C TSSOP20 package mechanical data mm. in. Dim. Min. Typ. Max. A Min. Typ. 1.2 A1 0.05 A2 0.8 b Max. 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 6.4 6.5 6.6 0.252 0.256 0.260 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 1 e 0.65 BSC K 0° L 0.45 Figure 7. 0.0256 BSC 0.60 8° 0° 0.75 0.018 8° 0.024 0.
PAGE 11
ST3222B - ST3222C Table 11. Package mechanical data Tape and reel TSSOP20 mechanical data mm. in. Dim. Min. A Typ. Max. Min. Typ. 330 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Max. 0.504 22.4 0.519 0.882 A0 6.8 7 0.268 0.276 B0 6.9 7.1 0.272 0.280 K0 1.7 1.9 0.067 0.075 P0 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 Figure 8.
PAGE 12
Revision history ST3222B - ST3222C 6 Revision history Table 12. Document revision history Date Revision 22-Mar-2006 5 Order codes updated. 21-Jan-2008 6 Modified: Table 3 and added Table 1. 25-Aug-2010 7 Updated Table 4, ECOPACK® text in Section 5: Package mechanical data; reformatted document, minor textual changes.
PAGE 13
ST3222B - ST3222C Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.