Datasheet

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September 2010 Doc ID 9066 Rev 5 1/13

ST3241EB

ST3241EC

±15 kV ESD protected 3 to 5.5 V, 400 kbps,

RS-232 transceiver with auto-power-down

Features

■ ESD protection for RS-232 I/O pins:

±8 kV IEC 1000-4-2 contact discharge

±15 kV human body model

■ 1 µA supply current achieved when in auto-

power-down

■ 250 kbps minimum guaranteed data rate

■ Guaranteed 6 V/ms slew rate range

■ Guaranteed mouse drive ability

■ 0.1 µF external capacitors

■ Meets EIA/TIA-232 specifications down to 3 V

■ Available in SSOP-28 package

Description

The ST3241E device consists of 3 drivers, 5

receivers and a dual charge-pump circuit. The

device meets the requirements of EIA/TIA and

V.28/V.24 communication standards providing

high data rate capability and enhanced

electrostatic discharge (ESD) protection. All

transmitter outputs and receiver inputs are

protected to ±8 kV using IEC 1000-4-2 contact

discharge and ±15 kV using the human body

model. The receiver R2 is always active to

implement a wake-up feature for serial port.

The ST3241E has a proprietary low-dropout

transmitter output stage enabling true RS-232

performance from a 3.0 V to 5.5 V supply with a

dual charge pump. The device is guaranteed to

run at data rates of 250 kbps while maintaining

RS-232 output levels.

It is a complete serial port (3 drivers, 5 receivers)

intended for notebook or sub-notebook

computers. Receivers R1 and R2 have extra

outputs in addition to their standard outputs.

These extra outputs are always active.

Typical applications are in notebooks, sub-

notebooks, palmtop computers, battery-powered

equipment, hand-held equipment, peripherals and

printers.

SSOP-28

Table 1. Device summary

Order code Temperature range Package Packaging

ST3241ECPR 0 to 70°C SSOP-28 (tape and reel) 1350 parts per reel

ST3241EBPR –40 to 85°C SSOP-28 (tape and reel) 1350 parts per reel

www.st.com

Summary of content (13 pages)

PAGE 1
ST3241EB ST3241EC ±15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver with auto-power-down Features ■ ESD protection for RS-232 I/O pins: ±8 kV IEC 1000-4-2 contact discharge ±15 kV human body model ■ 1 µA supply current achieved when in autopower-down ■ 250 kbps minimum guaranteed data rate ■ Guaranteed 6 V/ms slew rate range ■ Guaranteed mouse drive ability ■ 0.
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Contents ST3241EB - ST3241EC Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ST3241EB - ST3241EC 1 Pin configuration Pin configuration Figure 1. Pin configuration CS10800 Table 2. Pin description Pin number Symbol 1 C2+ Positive terminal of inverting charge pump capacitor 2 C2 Negative terminal of inverting charge pump capacitor 3 V- –5.
PAGE 4
Pin configuration ST3241EB - ST3241EC Table 2. Pin number Symbol 17 R3OUT Third receiver output voltage 18 R2OUT Second receiver output voltage 19 R1OUT First receiver output voltage 20 R2OUTB Non-inverting complementary receiver output, always active for wake-up 21 R1OUTB Non-inverting complementary receiver output, always active for wake-up 22 SHDN 23 EN Receiver enable.
PAGE 5
ST3241EB - ST3241EC Maximum ratings 2 Maximum ratings Table 4. Absolute maximum ratings Symbol Parameter Value Unit –0.3 to 6 V VCC Supply voltage V+ Extra positive voltage (Note: 1) (VCC –0.3) to 7 V V- Extra negative voltage (Note: 1) 0.3 to –7 V 13 V –0.3 to 6 V ± 25 V ± 13.2 V –0.3 to (VCC + 0.
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Electrical characteristics ST3241EB - ST3241EC 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 ISHDN Table 7. Symbol Parameter Test conditions 0.3 1 mA Shutdown supply current SHDN = GND, TA = 25°C - 1 10 µA Logic input and receiver output electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.
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ST3241EB - ST3241EC Table 10. Symbol Electrical characteristics Receiver electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified. Parameter Test conditions VRIN Receiver input voltage operating range VRIL RS-232 Input threshold low TA = 25 °C, VCC = 3.3 V TA = 25 °C, VCC = 5.0 V VRIH RS-232 Input threshold high TA = 25 °C, VCC = 3.3 V TA = 25 °C, VCC = 5.0 V VRIHYS Input hysteresis RRIN Input resistance Table 11. Symbol Min. Typ.
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Application 4 ST3241EB - ST3241EC Application Figure 2. Application circuits CS10810 Table 12. 8/13 Required minimum 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 0.1 3.0 to 5.5 0.1 0.47 0.47 0.47 0.
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ST3241EB - ST3241EC 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.
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Package mechanical data ST3241EB - ST3241EC SSOP28 mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 2 A1 0.050 A2 1.65 b Max. 0.079 0.002 1.85 0.065 0.22 0.38 0.009 0.015 c 0.09 0.25 0.004 0.010 D 9.9 10.2 10.5 0.390 0.402 0.413 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 10/13 Max. 1.75 0 .65 BSC K 0° L 0.55 0.75 0.069 0.073 0.0256 BSC 10° 0° 0.95 0.022 Doc ID 9066 Rev 5 10° 0.030 0.
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ST3241EB - ST3241EC Package mechanical data Tape & reel SSOP28 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 0.519 22.4 0.882 Ao 8.4 8.6 0.331 0.339 Bo 10.7 10.9 0.421 0.42 9 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.
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Revision history ST3241EB - ST3241EC 6 Revision history Table 13. Document revision history Date Revision 21-Jun-2004 2 The IL (Output Leakage Current) mA ==> µA in table 8. 03-Apr-2006 3 Order code updated. 13-Nov-2007 4 Added Table 1 28-Sep-2010 5 Removed TSSOP28 package and all references from datasheet; updated ECOPACK® text in Section 5; reformatted document; minor textual updates.
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ST3241EB - ST3241EC 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.