Datasheet

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January 2008 Rev 8 1/15

ST3222EB

ST3222EC

± 15 kV ESD protected, 3 to 5.5 V

low power, up to 250 Kbps, RS-232 drivers and receivers

Features

■ ESD protection for RS-232 I/O pins ± 15 kV

human body model, ± 8 kV IEC 1000-4-2

contact discharge

■ 300 µA supply current

■ 250KBps minimum guarantee data rate

■ 6 V/µs minimum guarantee slew rate

■ Meet EIA/TIA-232 specification down to 3 V

■ Available in SSOP20 and TSSOP20

Description

The ST3222E is a 3 V powered EIA/TIA-232 and

V.28/V.24 communications interface with low

power requirements, high data-rate capabilities

and enhanced electrostatic discharge (ESD)

protection to ± 8 kV using IEC1000-4-2 Contact

Discharge and ±15 kV using the Human Body

Model. ST3222E has a proprietary low dropout

transmitter output stage providing true RS-232

performance from 3 to 5 V supplies with a dual

charge pump. The charge pump requires only four

small 0.1 mF external capacitors for operation

form 3 V supply. The device has two receivers and

two drivers. The ST3222E 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 Notebook, Sub-notebook

and Palmtop Computers, Battery Powered

Equipment, Hand-Held Equipment, Peripherals

and Printers.

SSOP

TSSOP

Table 1. Device summary

Order codes

Temperature

range

Package Packaging

ST3222ECPR 0 to 70 °C SSOP20 (tape and reel) 1350 parts per reel

ST3222EBPR -40 to 85 °C SSOP20 (tape and reel) 1350 parts per reel

ST3222ECTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel

ST3222EBTR -40 to 85 °C TSSOP20 (tape and reel) 2500 parts per reel

www.st.com

Summary of content (15 pages)

PAGE 1
ST3222EB ST3222EC ± 15 kV ESD protected, 3 to 5.
PAGE 2
Contents ST3222E Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Typical performance characteristics . . . . . . . . .
PAGE 3
ST3222E Pin configuration 1 Pin configuration Figure 1. Pin connection Table 2. Pin description 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+ 5.5V Generated by the charge pump.
PAGE 4
Absolute maximum ratings ST3222E 2 Absolute 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
ST3222E Electrical characteristics 3 Electrical characteristics Table 6. Electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol ISUPPLY Parameter Table 7. No load, SHDN = VCC, TA = 25°C Typ. Max. Unit 0.3 1 mA 1 10 µA Logic input electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified.
PAGE 6
Electrical characteristics Table 9. Symbol ST3222E Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Parameter IOL Output leakage current VRIN Receiver input voltage operating range VRIL Input threshold low VRIH Input threshold high Test conditions R-OUT, EN = VCC, receiver disabled Unit ± 0.05 ± 10 µA 25 V 0.6 1.2 TA = 25°C, VCC = 5 V 0.8 1.5 V TA = 25°C, VCC = 3.
PAGE 7
ST3222E Application circuits 4 Application circuits Figure 2. Application schematic Table 11. Capacitance value (µF) VCC C1 C2 C3 C4 Cbypass 3.0 to 3.6 0.1 0.1 0.1 0.1 0.1 4.5 to 5.5 0.047 0.33 0.33 0.33 0.33 3.0 to 5.5 0.22 0.1 0.1 0.1 0.
PAGE 8
Typical performance characteristics ST3222E 5 Typical performance characteristics Figure 3. (unless otherwise specified TJ = 25 °C) Output current vs output high Figure 4. voltage Output current vs output high voltage Figure 5. Output current vs output low voltage Output current vs output low voltage Figure 7. Voltage transfer characteristics for Figure 8. transmitter inputs 8/15 Figure 6.
PAGE 9
ST3222E 6 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark.
PAGE 10
Package mechanical data ST3222E SSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. A Min. Typ. Max. 2 A1 0.05 A2 1.65 b 0.079 0.002 1.75 1.85 0.065 0.22 0.38 0.009 0.015 c 0.09 0.25 0.004 0.010 D 6.9 7.2 7.5 0.272 0.283 0.295 E 7.4 7.8 8.2 0.291 0.307 0.323 E1 5 5.3 5.6 0.197 0.209 0.220 e 0.069 0.65 BSC 0.073 0.0256 BSC K 0° 4° 8° 0° 4° 8° L 0.55 0.75 0.95 0.022 0.030 0.
PAGE 11
ST3222E Package mechanical data TSSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. A Min. Typ. Max. 1.2 A1 0.05 A2 0.8 b 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 A 0.0256 BSC 0.60 8° 0° 0.75 0.018 8° 0.024 0.
PAGE 12
Package mechanical data ST3222E Tape & reel SSOP20 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 12/15 Typ. 0.504 22.4 0.519 0.882 Ao 8.4 8.6 0.331 0.339 Bo 7.7 7.9 0.303 0.311 Ko 2.9 3.1 0.114 0.122 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.
PAGE 13
ST3222E Package mechanical data Tape & reel TSSOP20 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 22.4 0.519 0.882 Ao 6.8 7 0.268 0.276 Bo 6.9 7.1 0.272 0.280 Ko 1.7 1.9 0.067 0.075 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.
PAGE 14
Revision history ST3222E 7 Revision history Table 12. Document revision history Date Revision 22-Mar-2006 6 Order codes updated. 23-Aug-2007 7 Added Table 1 in cover page. 21-Jan-2008 8 Added note on Table 3.
PAGE 15
ST3222E 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.