ST3232EB
ST3232EC
± 15 kV ESD protection 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
■250 kbps minimum guaranteed data rate
■6 V/µs minimum guaranteed slew rate
■Meet EIA/TIA-232 specifications down to 3 V
■Available in SO-16, SO-16 large and TSSOP16
Applications
■Notebook, subnotebook and palmtop computers
■Battery powered equipment
■Hand-held equipment
■Peripherals and printers
SO-16 |
SO-16 Large |
TSSOP16
small 0.1 µF standard external capacitors for operations from 3 V supply.
The ST3232E has two receivers and two drivers.
The device is guaranteed to run at data rates of 250 kbps while maintaining RS-232 output levels.
Description
The ST3232E is a 3 V powered EIA/TIA-232 and V.28/V.24 communication interfaces 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. ST3232E 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
Table 1. |
Device summary |
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Order codes |
Temperature range |
Packages |
Packaging |
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ST3232ECDR |
0 to 70 °C |
SO-16 (tape and reel) |
2500 parts per reel |
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ST3232EBDR |
-40 to 85 °C |
SO-16 (tape and reel) |
2500 parts per reel |
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ST3232ECTR |
0 to 70 °C |
TSSOP16 (tape and reel) |
2500 parts per reel |
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ST3232EBTR |
-40 to 85 °C |
TSSOP16 (tape and reel) |
2500 parts per reel |
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January 2010 |
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Doc ID 8784 Rev 6 |
1/17 |
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www.st.com
Contents |
ST3232EB, ST3232EC |
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Contents
1 |
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 3 |
2 |
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
4 |
3 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
4 |
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
5 |
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
6 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
7 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2/17 |
Doc ID 8784 Rev 6 |
ST3232EB, ST3232EC |
Pin configuration |
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Table 2. |
Pin description |
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Pin n° |
Symbol |
Name and function |
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1 |
C1+ |
Positive terminal for the first charge pump capacitor |
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2 |
V+ |
Doubled voltage terminal |
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3 |
C1- |
Negative Terminal for the first charge pump capacitor |
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4 |
C2+ |
Positive terminal for the second charge pump capacitor |
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5 |
C2- |
Negative terminal for the second charge pump capacitor |
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6 |
V- |
Inverted voltage terminal |
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7 |
T2OUT |
Second transmitter output voltage |
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8 |
R2IN |
Second receiver input voltage |
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9 |
R2OUT |
Second receiver output voltage |
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10 |
T2IN |
Second transmitter input voltage |
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11 |
T1IN |
First transmitter input voltage |
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12 |
R1OUT |
First receiver output voltage |
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13 |
R1IN |
First receiver input voltage |
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14 |
T1OUT |
First transmitter output voltage |
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15 |
GND |
Ground |
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16 |
VCC |
Supply voltage |
Doc ID 8784 Rev 6 |
3/17 |
Absolute maximum ratings |
ST3232EB, ST3232EC |
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2 |
Absolute maximum ratings |
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Table 3. |
Absolute maximum ratings |
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Symbol |
Parameter |
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Value |
Unit |
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VCC |
Supply voltage |
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-0.3 to 6 |
V |
V+ |
Doubled voltage terminal |
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(VCC - 0.3) to 7 |
V |
V- |
Inverted voltage terminal |
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0.3 to -7 |
V |
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V+ +|V-| |
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13 |
V |
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TIN |
Transmitter input voltage range |
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-0.3 to 6 |
V |
RIN |
Receiver input voltage range |
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± 25 |
V |
TOUT |
Transmitter output voltage range |
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± 13.2 |
V |
ROUT |
Receiver output voltage range |
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-0.3 to (VCC + 0.3) |
V |
tSHORT |
Transmitter output short to gnd time |
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Continuous |
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Note: |
Absolute maximum ratings are those values beyond which damage to the device may occur. |
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Functional operation under these condition is not implied. |
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Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V.
Running on internal charge pump, intrinsic self limitation allows exceeding those values without any damage.
Startup voltage sequence (VCC, then V+, then V-) is critical, therefore it is not recommended to use this device using externally applied voltage to V+ and V-.
Figure 2. |
ESD performance: transmitter outputs, receiver inputs |
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Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
Unit |
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ESD |
ESD protection voltage |
Human body model |
±15 |
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kV |
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ESD |
ESD protection voltage |
IEC-1000-4-2 |
±8 |
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kV |
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4/17 |
Doc ID 8784 Rev 6 |
ST3232EB, ST3232EC |
Electrical characteristics |
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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.
Table 4. |
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Electrical characteristics |
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Symbol |
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Parameter |
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Test conditions |
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Min. |
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Typ. |
Max. |
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Unit |
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ISUPPLY |
VCC Power supply current |
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No Load, VCC = 3V or 5V, TA = 25°C |
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0.3 |
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1 |
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mA |
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C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical |
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values are referred to TA = 25 °C. |
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Table 5. |
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Logic input |
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Symbol |
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Parameter |
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Test conditions |
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Min. |
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Typ. |
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Max. |
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Unit |
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VTIL |
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Input logic threshold low |
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T-IN |
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0.8 |
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V |
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VHYS |
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Transmitter input hysteresis |
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0.25 |
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V |
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VTIH |
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Input logic threshold high |
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VCC = 3.3V |
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2 |
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V |
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VCC = 5V |
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2.4 |
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IIL |
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Input leakage current |
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T-IN |
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± 0.01 |
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± 1 |
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µA |
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C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless |
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otherwise specified. Typical values are referred to TA = 25 °C. |
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Table 6. |
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Transmitter |
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Symbol |
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Parameter |
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Test conditions |
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Min. |
Typ. |
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Max. |
Unit |
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VTOUT |
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Output voltage swing |
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All transmitter outputs are loaded with |
± 5 |
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± 5.4 |
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V |
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3kΩ to GND |
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RTOUT |
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Transmitter output |
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VCC = 0V, VOUT = ± 2V |
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300 |
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10M |
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Ω |
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resistance |
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ISC |
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Output short circuit current |
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± 60 |
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mA |
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VCC = 0V or 3.3V to 5.5V |
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ITOL |
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Output leakage current |
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VOUT = ± 12V |
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± 25 |
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µA |
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Transmitters disable |
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Doc ID 8784 Rev 6 |
5/17 |
Electrical characteristics |
ST3232EB, ST3232EC |
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C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C.
Table 7. |
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Receiver |
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Symbol |
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Parameter |
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Test conditions |
Min. |
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Typ. |
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Max. |
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Unit |
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VRIN |
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Receiver input voltage operating |
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-25 |
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25 |
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V |
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range |
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VRIL |
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RS-232 Input threshold low |
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TA = 25°C, VCC = 3.3V |
0.6 |
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1.1 |
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V |
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TA = 25°C, VCC = 5V |
0.8 |
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1.5 |
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VRIH |
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RS-232 Input threshold high |
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TA = 25°C, VCC = 3.3V |
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1.4 |
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2.4 |
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V |
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TA = 25°C, VCC = 5V |
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1.8 |
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2.4 |
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VRIHYS |
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Input hysteresis |
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0.5 |
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V |
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RRIN |
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Input resistance |
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TA = 25°C |
3 |
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5 |
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7 |
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kΩ |
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VROL |
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TTL/CMOS Output voltage low |
IOUT = 1.6mA |
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0.4 |
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V |
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VROH |
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TTL/CMOS Output voltage high |
IOUT = -1mA |
VCC-0.6 |
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VCC-0.1 |
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V |
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C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless |
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otherwise specified. Typical values are referred to TA = 25 °C |
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Table 8. |
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Timing characteristics |
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Symbol |
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Parameter |
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Test conditions |
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Min. |
Typ. |
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Max. |
Unit |
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DR |
Data transfer rate |
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RL = 3KΩ, CL2= 1000pF |
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250 |
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kbps |
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one transmitter switching |
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tPHLR |
Propagation delay input to |
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RXIN = RXOUT, CL = 150pF |
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0.15 |
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µs |
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tPLHR |
output |
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tOER |
Receiver output enable time |
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Normal Operation |
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50 |
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tODR |
Receiver output disable time |
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Normal Operation |
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50 |
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|tPHLT |
Transmitter propagation |
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(1) |
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200 |
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- tTHL| |
delay difference |
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|tPHLR |
Receiver propagation delay |
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50 |
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- tTHR| |
difference |
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TA = 25°C RL = 3kΩ to 7kΩ VCC = 3.3V |
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SRT |
Transition slew rate |
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measured from +3V to -3V or -3V to +3V |
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CL = 150pF to 1000pF |
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6 |
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30 |
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V/µs |
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CL = 150pF to 2500pF |
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4 |
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30 |
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V/µs |
1. Transmitter skew is measured at the transmitter zero cross points.
6/17 |
Doc ID 8784 Rev 6 |