ST3241EB, ST3241EC
±15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver
with auto power-down
Datasheet - production data
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.
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/µs slew rate range
Guaranteed mouse drive ability
0.1 µF external capacitors
Meets EIA/TIA-232 specifications down to
3V
Available in SSOP 28 package
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.
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 the serial port.
March 2017
DocID9066 Rev 6
This is information on a product in full production.
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www.st.com
Contents
ST3241EB, ST3241EC
Contents
1
Pin information ................................................................................ 3
2
Absolute maximum ratings and ESD performance ....................... 5
3
4
Electrical characteristics ................................................................ 6
Application ....................................................................................... 8
5
Package information ....................................................................... 9
5.1
SSOP 28 package information ........................................................ 10
5.2
SSOP 28 tape and reel package information .................................. 11
6
Ordering information..................................................................... 12
7
Revision history ............................................................................ 13
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ST3241EB, ST3241EC
1
Pin information
Pin information
Figure 1: Pin connections (top view)
Table 1: Pin description
Pin number
Symbol
Name and function
1
C2+
Positive terminal of inverting charge pump capacitor
2
C2
Negative terminal of inverting charge pump capacitor
3
V-
–5.5 V generated by the charge pump
4
R1IN
First receiver input voltage
5
R2IN
Second receiver input voltage
6
R3IN
Third receiver input voltage
7
R4IN
Fourth receiver input voltage
8
R5IN
Fifth receiver input voltage
9
T1OUT
First transmitter output voltage
10
T2OUT
Second transmitter output voltage
11
T3OUT
Third transmitter output voltage
12
T3IN
Third transmitter input voltage
13
T2IN
Second transmitter input voltage
14
T1IN
First transmitter input voltage
15
R5OUT
Fifth receiver output voltage
16
R4OUT
Fourth receiver output voltage
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
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Pin information
ST3241EB, ST3241EC
Pin number
Symbol
Name and function
21
R1OUTB
Non-inverting complementary receiver output, always active for wake-up
22
SHDN
Shutdown control, active low
23
EN
Receiver enable, active low
24
C1-
Negative terminal of voltage - charge pump capacitor
25
GND
Ground
26
VCC
Supply voltage
27
V+
5.5 V generated by the charge pump
28
C1+
Positive terminal of voltage - charge pump capacitor
Table 2: Shutdown and enable control truth table
SHDN
EN
TOUT
0
0
ROUT
TOUTB
Active
High Z
1
High Z
0
Active
Active
1
Active
1
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High Z
ST3241EB, ST3241EC
2
Absolute maximum ratings and ESD
performance
Absolute maximum ratings and ESD performance
Absolute maximum ratings are those values beyond which damage to the device may
occur. Functional operation under these conditions is not implied.
Table 3: Absolute maximum ratings
Symbol
Parameter
Value
Unit
–0.3 to 6
VCC
Supply voltage
V+
Extra positive voltage (1)
(VCC – 0.3) to 7
V-
Extra negative voltage (1)
0.3 to -7
(1)
V+ + IV-I
SHDN , EN , TIN
RIN
V
-0.3 to 6
± 25
Transmitter output voltage range
ROUT, ROUTB, INVALID
Tstg
Input voltage
Receiver input voltage range
TOUT
tSHORT
13
Receiver output voltage range
± 13.2
–0.3 to (VCC + 0.3)
Short circuit duration on TOUT (one at a time)
Continuous
Storage temperature range
–65 to 150
°C
Notes:
(1)V+
and V- can have a maximum magnitude of 7 V, but their absolute addition cannot exceed 13 V
Table 4: ESD performance: transmitter outputs, receiver inputs
Symbol
Parameter
ESD
ESD protection voltage
Test conditions
Min.
Human body model
± 15
IEC 1000-4-2 (contact discharge)
±8
DocID9066 Rev 6
Typ.
—
Max.
Unit
—
kV
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Electrical characteristics
3
ST3241EB, ST3241EC
Electrical characteristics
Table 5: 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
Parameter
Test conditions
ISUPPLY
Supply current
No load VCC = 3.3 V or 5 V,
TA = 25 °C
ISHDN
Shutdown supply current
Min.
Typ.
Max.
Unit
0.3
1
mA
1
10
µA
—
SHDN = GND, TA = 25 °C
Table 6: Logic input and receiver output electrical characteristics, C1 - C4 = 0.1 µF, VCC = 3 V
to 5.5 V, TA = –40 to 85 °C, unless otherwise specified
Symbol
Parameter
VTIL
Input logic threshold low
VTIH
Input logic threshold high
IIL
Test conditions
Input leakage current
Min.
Typ.
TIN, EN , SHDN
Max.
Unit
0.8
V
VCC = 3.3 V
2
VCC = 5 V
2.4
TIN, EN , SHDN
± 0.01
± 1.0
µA
Table 7: Receiver output electrical characteristics, C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V,
TA = –40 to 85 °C, unless otherwise specified
Symbol
Parameter
Test conditions
IOL
Output leakage
current
ROUT, EN , receiver
VOL
Output voltage low
IOUT = 1.6 mA
VOH
Output voltage high
IOUT = -1 mA
Min.
Typ.
Max.
Unit
± 0.05
± 10
µA
disabled
—
0.4
VCC –
0.6
VCC –
0.1
V
Table 8: Transmitter electrical characteristics, C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V,
TA = –40 to 85 °C, unless otherwise specified
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Symbol
Parameter
Test conditions
Min.
Typ.
VTOUT
Output voltage
swing
All transmitter outputs are loaded with
3 kΩ to GND
±5
± 5.4
V
ROUT
Output
resistance
VCC = V+ = V- = 0 V, VOUT = ± 2 V
300
10 M
Ω
ISC
Output short
circuit current
IL
Output leakage
current
VCC = 0 to 5.5 V, transmitter output
= ±12 V, transmitter disabled
VTO
Transmitter
output voltage
T1IN = T2IN = GND, T3IN = VCC, T3OUT
loaded with 3 kΩ to GND, T1OUT and
T2OUT loaded with 2.5 mA each
± 35
DocID9066 Rev 6
±5
Max.
Unit
± 60
mA
± 25
µA
V
ST3241EB, ST3241EC
Electrical characteristics
Table 9: Receiver electrical characteristics, C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V,
TA = –40 to 85 °C, unless otherwise specified
Symbol
Parameter
VRIN
Receiver input voltage operating
range
VRIL
RS-232 Input threshold low
VRIH
Test conditions
Min.
Typ.
-25
Max.
Unit
25
TA = 25 °C, VCC = 3.3 V
0.6
1.2
TA = 25 °C, VCC = 5.0 V
0.8
1.5
V
TA = 25 °C, VCC = 3.3 V
1.5
2.4
TA = 25 °C, VCC = 5.0 V
1.8
2.4
RS-232 Input threshold high
VRIHYS
Input hysteresis
RRIN
Input resistance
0.3
TA = 25 °C
3
5
kΩ
7
Table 10: Timing characteristics, C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = –40 to 85 °C,
unless otherwise specified
Symbol
Parameter
Test conditions
Min.
Typ.
DR
Maximum data
rate
RL = 3 kΩ, CL= 1000 pF one transmitter
switching
250
tPHL,
tPLH
Receiver
propagation delay
RIN to ROUT, CL = 150 pF
tT_SKEW
Transmitter skew
100
tR_SKEW
Receiver skew
300
Max.
Unit
kbps
0.15
µs
ns
SRT
Transition slew
rate
TA = 25 °C, RL = 3 k to 7 kΩ, VCC = 3.3
V measured from 3 V to –3 V or –3 V
to
3 V, CL = 150 pF to 1000 pF
TA = 25 °C, RL = 3 k to 7 kΩ, VCC = 3.3
V measured from 3 V to –3 V or –3 V
to
3 V, CL = 150 pF to 2500 pF
DocID9066 Rev 6
6
30
V/µs
4
30
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Application
4
ST3241EB, ST3241EC
Application
Figure 2: Application circuits
Table 11: Required minimum capacitance value (µF)
8/14
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
0.1
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ST3241EB, ST3241EC
5
Package information
Package information
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.
DocID9066 Rev 6
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Package information
5.1
ST3241EB, ST3241EC
SSOP 28 package information
Figure 3: SSOP 28 package outline
Table 12: SSOP 28 mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Max.
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
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Inches
1.75
0.65
K
0°
L
0.55
0.75
0.069
0.073
0.0256
10 °
0°
0.95
0.022
DocID9066 Rev 6
10 °
0.030
0.037
ST3241EB, ST3241EC
5.2
Package information
SSOP 28 tape and reel package information
Figure 4: SSOP 28 tape and reel package outline
1.
Drawing is not to scale
Table 13: SSOP 28 tape and reel mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Inches
Max.
Min.
Typ.
330
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
Ao
8.4
Bo
13.2
—
Max.
0.504
22.4
0.519
—
0.882
8.6
0.331
10.7
10.9
0.421
0.429
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
0.476
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Ordering information
6
ST3241EB, ST3241EC
Ordering information
Table 14: Order codes
12/14
Order code
Temperature range
ST3241EBPR
-40 to 85 °C
ST3241ECPR
0 to 70 °C
Package
Packaging
SSOP 28 (tape and reel)
1350 parts per reel
DocID9066 Rev 6
Marking
ST3241EB
ST3241EC
ST3241EB, ST3241EC
7
Revision history
Revision history
Table 15: 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.
6
Features: updated units of slew rate change (from 6 V/ms to 6 V/µs)
Moved "Device summary" table to Section 6: "Ordering information" and
added "Marking".
Table 12: removed "BSC" from "e" dimension
08-Mar-2017
Changes
DocID9066 Rev 6
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ST3241EB, ST3241EC
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