STMicroelectronics ST3243C Datasheet
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ST3243B, ST3243C
±15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver with auto-power-down
Datasheet
-
production data
Order code
ST3243CPR
SSOP-28
Features
• ESD protection for RS-232 I/O pins
– ±8 kV IEC61000-4-2 contact discharge
– ±15 kV IEC61000-4-2 air discharge
• 1 μ A supply current achieved when in autopower-down
• 250 kbps minimum guaranteed data rate
• Guaranteed 6 V/ μ s slew rate range
• Guaranteed mouse drive ability
• 0.1 μ F external capacitors
• Meet EIA/TIA-232 specifications down to 3 V
• Available in SSOP-28 package
Description
The ST3243B/ST3243C devices consist of 3 drivers, 5 receivers and a dual charge pump circuit. The devices meet 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 IEC61000-4-2 contact discharge and ±15 kV IEC61000-4-2 air discharge.
The receiver R2 is always active to implement a wake-up feature for the serial port.
The ST3243B/ST3243C devices have 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 devices are guaranteed to run at data rates of
250 kbps while maintaining RS-232 output levels.
The auto-power-down feature functions when
FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (expert R2B) are shut off, and supply current is reduced to 1 µA.
Disconnecting the serial port or turning off the peripheral drives causes the auto-power-down condition to occur.
Auto-power-down can be disabled when
FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With autopower-down enabled, the device is activated automatically when a valid signal is applied to any receiver input.
Typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals, and printers.
Table 1. Device summary
Temperature range Package
0 to 70 °C SSOP-28 (tape and reel)
Packaging
1350 parts per reel
Note: For new designs, we recommend the use of the ST3243EB and ST3243EC which have a temperature range of -40 to 85 °C and 0 to 70 °C respectively.
October 2014
This is information on a product in full production.
DocID7539 Rev 12 1/18 www.st.com
Contents
Contents
ST3243B, ST3243C
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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ST3243B, ST3243C
Figure 1. Pin configuration
Pin configuration
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18
Pin configuration
Pin no
9
10
11
12
13
14
7
8
5
6
3
4
1
2
15
16
17
18
19
20
21
22
23
24
25
26
27
28
ST3243B, ST3243C
Symbol
Table 2. Pin description
Name and function
C
1
-
GND
V
CC
V+
C
1
+
C
2
+
C
2
-
V-
T2
IN
T1
IN
R5
OUT
R4
OUT
R3
OUT
R2
OUT
R1
OUT
R1
IN
R2
IN
R3
IN
R4
IN
R5
IN
T1
OUT
T2
OUT
T3
OUT
T3
IN
R2
OUTB
INVALID
FORCEOFF
FORCEON
Positive terminal of inverting charge pump capacitor
Negative terminal of inverting charge pump capacitor
- 5.5 V generated by the charge pump
First receiver input voltage
Second receiver input voltage
Third receiver input voltage
Fourth receiver input voltage
Fifth receiver input voltage
First transmitter output voltage
Second transmitter output voltage
Third transmitter output voltage
Third transmitter input voltage
Second transmitter input voltage
First transmitter input voltage
Fifth receiver output voltage
Fourth receiver output voltage
Third receiver output voltage
Second receiver output voltage
First receiver output voltage
Non-inverting complementary receiver output, always active for wakeup
Output of the valid signal detector. Indicates if a valid
RS-232 level is present on receiver inputs logic “1”
Drive low to shut down transmitters and on-board power supply. This overrides all automatic circuitry and
FORCEON
Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high)
Negative terminal of voltage charge pump capacitor
Ground
Supply voltage
5.5 V generated by the charge pump
Positive terminal of voltage charge pump capacitor
4/18 DocID7539 Rev 12
ST3243B, ST3243C Pin configuration
FORCEOFF
0
1
T
OUT
Table 3. Truth table
HIGH Z
ACTIVE
(1)
R
OUT
HIGH Z
ACTIVE
(1)
R
2OUTB
ACTIVE
(1)
ACTIVE
(1)
1. If the part is in auto-power-down mode (FORCEOFF = V if no valid RS-232 levels are present on all receiver input.
, FORCEON = GND) it is shutdown,
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Maximum ratings
2 Maximum ratings
ST3243B, ST3243C
Symbol
Table 4. Absolute maximum ratings
Parameter
V
CC
V+
V-
V+ +|V-|
Supply voltage
Doubled voltage terminal
Inverted voltage terminal
FORCEON,
FORCEOFF, T
IN
R
IN
T
OUT
R
OUT
R
OUTB
INVALID t
SHORT
T
STG
Input voltage
Receiver input voltage range
Transmitter output voltage range
Receiver output voltage range
Short-circuit duration on T
OUT
Storage temperature range
(one at a time)
Value
-0.3 to 6
(V
CC
-0.3) to 7
0.3 to -7
13
-0.3 to 6
± 25
± 13.2
-0.3 to (V
CC
+ 0.3)
Continuous
-65 to 150
Unit
V
°C
Note:
Symbol
ESD
ESD
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied. V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V.
Table 5. ESD performance: transmitter outputs, receiver inputs
Parameter Test conditions Min.
Typ.
Max.
Unit
ESD protection voltage IEC61000-4-2 air discharge ± 15
ESD protection voltage IEC61000-4-2 (contact discharge) ± 8
— — kV
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ST3243B, ST3243C Electrical characteristics
C
1
- C
4
= 0.1 µF, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
Symbol
I
ASHDN
Supply current auto-power-down
I
SHDN
Parameter
Shutdown supply current
I
SUPPLY
Supply current auto-power-down disabled
Table 6. Electrical characteristics
Test conditions
V
CC
= 3.3 or 5.0 V, T
A
= 25 °C
All R_IN open, FORCEOFF = V
CC
V
CC
= 3.3 or 5.0 V, T
A
= 25 °C
All R_IN open, FORCEOFF =
GND
V
CC
= 3.3 or 5.0 V T
A
= 25 °C
FORCEON = FORCEOFF = V
CC no load
Min.
Typ.
1
1
0.3
Max.
Unit
10
10
1
µA mA
C
1
- C
4
= 0.1
µA, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
V
TIH
Symbol
V
TIL
Table 7. Logic input electrical characteristics
Parameter
Input logic threshold low
Test conditions Min.
Input logic threshold high
T-IN, FORCEON, FORCEOFF
T-IN, FORCEON, FORCEOFF
V
V
CC
= 3.3 V
CC
= 5 V
V
THYS
I
IL
I
OL
V
OL
V
OH
Transmitter input hysteresis
Input leakage current
Output leakage current
Output voltage low
Output voltage high
T-IN, FORCEON, FORCEOFF
Receiver disabled
I
OUT
= 1.6 mA
I
OUT
= -1 mA
Typ.
Max.
Unit
0.8
2
2.4
0.5
± 0.01
± 1.0
± 0.05
± 10
0.4
V
CC
- 0.6 V
CC
- 0.1
V
µA
V
DocID7539 Rev 12 7/18
18
Electrical characteristics ST3243B, ST3243C
C
1
- C
4
= 0.1
µF, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
Symbol
V
RITE
V
RITD
V
IOL
V
IOH t
WU t
INVH t
INVL
Table 8. Auto-power-down electrical characteristics
Parameter Test conditions Min.
Receiver input threshold to transmitter enabled
Receiver input threshold to transmitter disabled
INVALID output voltage LOW
INVALID output voltage HIGH
Receiver threshold to transmitter enabled
Receiver positive or negative threshold to INVALID HIGH
Receiver positive or negative threshold to INVALID LOW
Positive threshold
Negative threshold
1 µA supply current
I
OUT
= 1.6 mA
I
OUT
= -1 mA
2.7
-0.3
V
CC
- 0.6
Typ.
Max.
Unit
2.7
250
1
30
0.3
0.4
V
µs
C
1
- C
4
= 0.1
µF, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
Symbol
V
TOUT
R
OUT
I
SC
V
OT
Table 9. Transmitter electrical characteristics
Parameter Test conditions Min.
Output voltage swing
Output resistance
Output short-circuit current
All transmitter outputs are loaded with
3 k Ω to GND
V
CC
= V+ = V- = 0 V, V
OUT
= ± 2 V
± 5
300
Transmitter output voltage
T1IN = T2IN = GND, T3IN = V
CC
T3OUT loaded with 3 k Ω to GND
T1OUT and T2OUT loaded with
2.5 mA each
± 5
Typ.
Max.
Unit
± 5.4
10 M
± 35 ± 60
V
Ω mA
V
8/18 DocID7539 Rev 12
ST3243B, ST3243C Electrical characteristics
C
1
- C
4
= 0.1
µF, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
Symbol
V
RIN
V
RIL
V
RIH
V
RIHYS
R
RIN
Table 10. Receiver electrical characteristics
Parameter Test conditions Min.
Receiver input voltage operating range
-25
RS-232 Input threshold low
RS-232 Input threshold high
T
A
= 25 °C, V
CC
T
A
= 25 °C, V
CC
= 3.3 V
= 5.0 V
T
A
= 25 °C, V
CC
T
A
= 25 °C, V
CC
= 3.3 V
= 5.0 V
0.6
0.8
Input hysteresis
Input resistance T
A
= 25 °C 3
Typ.
Max.
Unit
1.2
1.2
1.5
1.8
0.5
5
25
2.4
2.4
7
V k Ω
C
1
- C
4
= 0.1
µF, V
CC
= 3 V to 5.5 V, T values are referred to T
A
= 25 °C.
A
= -40 to 85 °C, unless otherwise specified. Typical
Symbol Parameter
Table 11. Timing characteristics
Test conditions
D
R
Maximum data rate
R
L
= 3 k Ω , C
L
= 1000 pF one transmitter switching t
PHL t
PLH t
T_SKEW t
R_SKEW
Receiver propagation delay R
IN
to R
OUT
, C
L
= 150 pF
Transmitter skew t t
INVH
INVL
Receiver skew
Receiver positive or negative threshold to
INVALID HIGH
Receiver positive or negative threshold to
INVALID LOW
S
RT
Transition slew rate
T
A
= 25 °C, R
L
= 3 k Ω to 7 k Ω, V
CC
= 3.3 V measured from +3 V to -3 V or -3 V to +3 V
C
L
C
L
= 150 pF to 1000 pF
= 150 pF to 2500 pF
Min.
Typ.
Max.
Unit
250
6
4
400
0.15
100
50
1
30
30
30 kbps
µs ns
µs
V/µs
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Application
4 Application
Figure 2. Application circuit
ST3243B, ST3243C
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$0
ST3243B, ST3243C
V
CC
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
C1
0.1
0.047
0.22
Table 12. Capacitance value (µF)
C2 C3
0.1
0.33
1.0
0.1
0.33
1.0
C4
0.1
0.33
1.0
Application
Cbypass
0.1
0.33
0.22
DocID7539 Rev 12 11/18
18
Typical performance characteristics
5 Typical performance characteristics
Unless otherwise specified T
J
= 25 °C.
Figure 3. INVALID HIGH threshold time
ST3243B, ST3243C
Figure 4. INVALID LOW threshold time
Figure 5. Receiver propagation delay
Figure 6. Receiver output enable and disable time
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ST3243B, ST3243C
Figure 7. Output current vs. output high voltage
Typical performance characteristics
Figure 8. Output current vs. output low voltage
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Package mechanical data
6 Package mechanical data
ST3243B, ST3243C
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.
14/18 DocID7539 Rev 12
ST3243B, ST3243C Package mechanical data
Figure 9. SSOP-28 package mechanical drawing
Table 13. SSOP-28 package mechanical data
Dimensions mm inches Symbol
Min. Typ. Max. Min. Typ. Max.
A 2 0.079
A1 0.050 0.002
0.073
b 0.22
c 0.09
0.015
0.010
E 7.4 7.8
e 0.65 BSC
K 0°
0.0256 BSC
10°
0.037
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Package mechanical data
Figure 10. SSOP-28 tape and reel mechanical drawing (1)
ST3243B, ST3243C
1. Drawing not in scale.
Table 14. SSOP-28 tape and reel mechanical data
Dimensions mm inches Symbol
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8
D 20.2 0.795
0.519
N 60 2.362
T 22.4 0.882
Ao 8.4
Bo 10.7
0.339
0.429
Ko 2.9
Po 3.9
P 11.9
0.122
0.161
0.476
16/18 DocID7539 Rev 12
ST3243B, ST3243C Revision history
Date
19-Sep-2004
31-Mar-2006
12-Nov-2007
21-Oct-2009
07-Oct-2011
15-Feb-2013
02-Oct-2014
Revision
8
9
6
7
10
11
12
Table 15. Document revision history
Changes
Document updating.
Order codes updated.
Added
Modified
Added ST3243B device, document reformatted, updated/added
,
, minor text and typo modifications throughout the document.
Updated title, Features , Description and
(added ESD protection, replaced
“Human body model” by “±15 kV IEC61000-4-2 air discharge”, IEC1000-4-2 replaced by IEC61000-4-2).
Removed Note 2 below Table 4 .
Added
Corrected typ. and max. mm value of E symbol in Table 13 .
Minor corrections throughout document.
Description : Replaced supply current of “1 mA” with “1 µA”
Table 1: Device summary : removed obsolete order code ST3243BPR
Added
Minor text updates throughout document
DocID7539 Rev 12 17/18
18
ST3243B, ST3243C
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© 2014 STMicroelectronics – All rights reserved
18/18 DocID7539 Rev 12
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