±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.
ST3241EB
ST3241EC
SSOP-28
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, subnotebooks, palmtop computers, battery-powered
equipment, hand-held equipment, peripherals and
printers.
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.
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
September 2010 Doc ID 9066 Rev 5 1/13
www.st.com
1
Contents ST3241EB - ST3241EC
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13 Doc ID 9066 Rev 5
ST3241EB - ST3241EC Pin configuration
1 Pin configuration
Figure 1. Pin configuration
Table 2. Pin description
Pin
number
1C
2C
3 V- –5.5 V generated by the charge pump
4R1
5R2
6R3
7R4
8R5
9T1
10 T2
11 T3
12 T3
13 T2
14 T1
15 R5
16 R4
Symbol Name and function
+ Positive terminal of inverting charge pump capacitor
2
Negative terminal of inverting charge pump capacitor
2
First receiver input voltage
IN
Second receiver input voltage
IN
Third receiver input voltage
IN
Fourth receiver input voltage
IN
Fifth receiver input voltage
IN
OUT
OUT
OUT
OUT
OUT
First transmitter output voltage
Second transmitter output voltage
Third transmitter output voltage
Third transmitter input voltage
IN
Second transmitter input voltage
IN
First transmitter input voltage
IN
Fifth receiver output voltage
Fourth receiver output voltage
CS10800
Doc ID 9066 Rev 5 3/13
Pin configuration ST3241EB - ST3241EC
Table 2. Pin description (continued)
Pin
number
17 R3
18 R2
19 R1
20 R2
21 R1
Symbol Name and function
OUT
OUT
OUT
OUTB
OUTB
Third receiver output voltage
Second receiver output voltage
First receiver output voltage
Non-inverting complementary receiver output, always active for wake-up
Non-inverting complementary receiver output, always active for wake-up
22 SHDN Shutdown control. Active low.
23 EN Receiver enable. Active low
24 C
- Negative terminal of voltage - charge pump capacitor
1
25 GND Ground
26 V
CC
Supply voltage
27 V+ 5.5 V Generated by the charge pump
28 C1+ Positive terminal of voltage - charge pump capacitor
Table 3. Shutdown and enable control truth table
SHDN EN T
0 0 HIGH Z ACTIVE ACTIVE
OUT
R
OUT
R
OUTB
0 1 HIGH Z HIGH Z ACTIVE
1 0 ACTIVE ACTIVE ACTIVE
1 1 ACTIVE HIGH Z ACTIVE
4/13 Doc ID 9066 Rev 5
ST3241EB - ST3241EC Maximum ratings
2 Maximum ratings
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V+ Extra positive voltage (Note: 1)(V
V- Extra negative voltage (Note: 1) 0.3 to –7 V
V+ + |V-| (Note: 1)13V
EN, TINInput voltage –0.3 to 6 V
SHDN,
R
IN
T
OUT
R
OUT ROUTB
INVALID
t
SHORT
T
stg
Supply voltage –0.3 to 6 V
–0.3) to 7 V
CC
Receiver input voltage range ± 25 V
Transmitter output voltage range ± 13.2 V
Receiver output voltage range –0.3 to (VCC + 0.3) V
Short circuit duration on T
Storage temperature range –65 to 150 °C
(one at a time) Continuous
OUT
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Note: 1 V+ and V- can have a maximum magnitude of +7 V, but their absolute addition cannot
exceed 13 V.
Table 5. ESD performance: transmitter outputs, receiver inputs
Symbol Parameter Test conditions Min. Typ. Max. Unit
ESD ESD protection voltage Human body model ± 15 - - kV
ESD ESD protection voltage IEC 1000-4-2 (contact discharge) ± 8- -kV
Doc ID 9066 Rev 5 5/13
Electrical characteristics ST3241EB - ST3241EC
3 Electrical characteristics
Table 6. Electrical characteristics
(C1 - C4 = 0.1 µF, V
Typical values are referred to T
Symbol Parameter Test conditions Min. Typ. Max. Unit
= 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
CC
= 25 °C)
A
I
SUPPLY
I
SHDN
Supply current No load VCC = 3.3V or 5V, TA = 25°C - 0.3 1 mA
Shutdown supply current SHDN = GND, TA = 25°C - 1 10
Table 7. Logic input and receiver output electrical characteristics
(C
- C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
1
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
Input logic threshold low TIN, EN, SHDN 0.8 V
TIL
V
= 3.3V
Input logic threshold high
TIH
Input leakage current TIN, EN, SHDN ± 0.01 ± 1.0
I
IL
CC
VCC = 5V
2
2.4
Table 8. Receiver output electrical characteristics
(C
- C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
1
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
V
V
Output leakage current R
OL
Output voltage low I
OL
Output voltage high I
OH
, EN, receiver disabled - ± 0.05 ± 10
OUT
= 1.6mA - 0.4 V
OUT
= –1mA - VCC–0.6 VCC–0.1 V
OUT
µA
V
V
µA
µA
Table 9. Transmitter electrical characteristics
(C
- C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
1
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
R
V
TOUT
I
Output voltage swing
Output resistance VCC = V+ = V- = 0 V, V
OUT
Output short circuit current ± 35 ± 60 mA
SC
I
Output leakage current
L
Transmitter output voltage
TO
6/13 Doc ID 9066 Rev 5
All transmitter outputs are loaded with
3 kΩ to GND
= ± 2V 300 10M Ω
OUT
V
= 0 to 5.5V, transmitter output =
CC
±12 V, transmitter disabled
T1IN = T2IN = GND, T3IN = V
CC
T3OUT loaded with 3 kΩ to GND
T1OUT and T2OUT loaded with 2.5 mA
each
± 5 ± 5.4 V
± 25 µA
± 5V
ST3241EB - ST3241EC Electrical characteristics
Table 10. Receiver electrical characteristics
(C
- C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
1
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
V
V
RIHYS
R
Receiver input voltage
RIN
operating range
RS-232 Input threshold low
RIL
RS-232 Input threshold high
RIH
= 25 °C, VCC = 3.3 V
T
A
TA = 25 °C, VCC = 5.0 V
T
= 25 °C, VCC = 3.3 V
A
TA = 25 °C, VCC = 5.0 V
–25 25 V
0.6
0.8
1.2
1.5
1.5
1.8
Input hysteresis 0.3 V
Input resistance TA = 25 °C 3 5 7 kΩ
RIN
2.4
2.4
Table 11. Timing characteristics
(C
- C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C, unless otherwise specified.
1
Symbol Parameter Test Conditions Min. Typ. Max. Unit
= 3 kΩ, CL= 1000 pF
R
D
R
t
PHL
tPLH
t
T_SKEW
t
R_SKEW
S
RT
Maximum data rate
Receiver propagation delay RIN to R
L
one transmitter switching
, CL = 150 pF 0.15 µs
OUT
Transmitter skew 100 ns
Receiver skew 300 ns
= 25 °C, RL = 3 k to 7 kΩ, VCC = 3.3 V
T
A
Transition slew rate
measured from +3 V to –3 V or –3 V to +3 V
= 150 pF to 1000 pF
C
L
CL = 150 pF to 2500 pF
250 kbps
6
3030V/µs
4
V
V
V/µs
Doc ID 9066 Rev 5 7/13
Application ST3241EB - ST3241EC
4 Application
Figure 2. Application circuits
Table 12. Required minimum capacitance value (µF)
V
CC
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 0.1
8/13 Doc ID 9066 Rev 5
CS10810
ST3241EB - ST3241EC Package mechanical data
5 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 9066 Rev 5 9/13
Package mechanical data ST3241EB - ST3241EC
SSOP28 mechanical data
.hcni.mm
Dim.
Min. Typ. Max. Min. Typ. Max.
70.02A 9
200.0050.01A
A2 1.65 1.75 1.85 0.065 0.069 0.073
b .022.0 38 0.009 0.015
c 0.09 010.0400.052.0
D 9.9 10.2 10.5 0.390 0.402 0.413
E 7.4 7.88.2 0.291 0.307 0.323
E1 5 5.3 5.6 0.197 0.209 0.220
B 56.0e S B 6520.0C SC
K
L 0.55 0.75 0.95 0.022 0.0300.037
°01°0°01°0
10/13 Doc ID 9066 Rev 5
ST3241EB - ST3241EC Package mechanical data
Tape & reel SSOP28 mechanical data
.hcni.mm
Dim.
Min. Typ. Max. Min. Typ. Max.
A 33 .210992
C12.8 13 15.0405.02.9
7.02.02D95
.206N 362
.04.22T 882
Ao 8.4 8.6 0.33 .01 339
.017.01oB924.0124.09
Ko 2. 39 221.0411.01.
Po 3.9 4.1 0.15
3 0.161
P 11.9 12.1 0.468 0.476
Note: Drawing not to scale
Doc ID 9066 Rev 5 11/13
Revision history ST3241EB - ST3241EC
6 Revision history
Table 13. Document revision history
Date Revision Changes
21-Jun-2004 2 The I
(Output Leakage Current) mA ==> µA in table 8.
L
03-Apr-2006 3 Order code updated.
13-Nov-2007 4 Added Ta b l e 1
28-Sep-2010 5
Removed TSSOP28 package and all references from datasheet; updated
ECOPACK
®
text in Section 5; reformatted document; minor textual updates.
12/13 Doc ID 9066 Rev 5
ST3241EB - ST3241EC
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Doc ID 9066 Rev 5 13/13
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