ST3237
3 to 5.5V, 250Kbps, RS-232
Transceiver with stand-by
Feature summary
■
1µA low power shutdown with receivers active
■
Guaranteed data rate
– 250Kbps (normal operation)
– 1Mbps (very high speed operation)
■
Guaranteed slew rate range
– 6V/µs (normal operation)
– 24V/µs (very high speed operation)
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0.1µF external capacitors
■
Flow-through pinout
■
500uA low supply current
■
Meet EIA/TIA-232 specifications down to 3V
■
Available in SSOP-28
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Description
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SSOP
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performance from a 3V to 5.5V supply using a
dual charge pump. The device is guaranteed to
run at data rates of 250Kbps in the normal
operation mode and 1Mbps in the very high
speed operation mode while maintaining RS-232
output levels.
The ST3237 is a 3V to 5.5V powered EIA/TIA-232
and V.28/V.24 communication interfaces high
data-rate capabilities. ST3237 is a transceiver (5
drivers, 3 receivers) for fast modem applications.
The device has a proprietary low-dropout
transmitter output stage providing true RS-232
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Order codes
Part number
Temperature
range
Package
Packaging
ST3237BPR
-40 to 85 °C
SSOP-28 (Tape & Reel)
1350 parts per reel
January 2007
Rev 8
1/15
www.st.com
15
Contents
ST3237
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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ST3237
Pin configuration
1
Pin configuration
Figure 1.
Pin description
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Table 1.
Pin description
PlN N°
SYMBOL
1
C2+
2
GND
C2-
4
5
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7
9
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11
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V-
T1OUT
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T2OUT
T3OUT
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Positive Terminal of Inverting Charge Pump Capacitor
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Ground
Negative Terminal of Inverting Charge Pump Capacitor
5.5V Generated by the Charge Pump
(t s)
First Transmitter Output Voltage
Second Transmitter Output Voltage
Third Transmitter Output Voltage
First Receiver Input Voltage
R2IN
Second Receiver Input Voltage
R3IN
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NAME AND FUNCTION
R1IN
T4OUT
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Fourth Transmitter Output Voltage
Third Receiver Input Voltage
12
T5OUT
13
EN
14
SHDN
Shutdown Control, Active Low
15
VHSCI
Very High Speed Control Input. Connect to GND for normal
operation; connect to VCC for 1Mbps transmission rates.
16
R1OUTB
Non Inverting Complementary Receiver Output. Always Active.
17
T5IN
Fifth Transmitter Input Voltage
18
R3OUT
Third Receiver Output Voltage
Fifth Transmitter Output Voltage
Receiver Enable, Active Low
3/15
Pin configuration
Table 1.
ST3237
Pin description
PlN N°
SYMBOL
NAME AND FUNCTION
19
T4IN
Fourth Transmitter Input Voltage
20
R2OUT
Second Receiver Output Voltage
21
R1OUT
First Receiver Output Voltage
22
T3IN
Third Transmitter Input Voltage
23
T2IN
Second Transmitter Input Voltage
24
T1N
First Transmitter Input Voltage
25
C1-
Negative Terminal of Voltage- Charge Pump Capacitor
26
VCC
Supply Voltage
27
V+
-5.5V Generated by the Charge Pump
28
C1+
Positive Terminal of Voltage- Charge Pump Capacitor
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ST3237
Absolute maximum ratings
2
Absolute maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VCC
Supply voltage
-0.3 to 6
V
V+
Doubled voltage terminal
-0.3 to 7
V
V-
Inverted voltage terminal
0.3 to -7
V
V+ +|V-|
TIN
Transmitter Input voltage range
Very high speed control input
RIN
Receiver input voltage range
od
-0.3 to (VCC +0.3)
Transmitter output voltage range
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ROUT ROUTB Receiver output voltage range
TSTG
so
Short circuit duration on TOUT (one at a time)
Storage temperature range
)
(s
Note:
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-0.3 to 6
VHSCI
tSHORT
V
-0.3 to 6
SHDN, EN
TOUT
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13
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± 25
V
V
V
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± 13.2
V
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-0.3 to (VCC + 0.3)
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Continuous
-65 to 150
P
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let
°C
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 +7V, but their absolute addition can not exceed 13 V.
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5/15
Electrical characteristics
ST3237
3
Electrical characteristics
Table 3.
Electrical characteristics (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless
otherwise specified. Typical values are referred to TA = 25°C)
Symbol
Parameter
Test conditions
VCC = 3V or 5.0V
ISUPPLY
VCC power supply current
No load
25°C
ISHDN
Shutdown supply current
SHDN=GNDTA = 25°C
Table 4.
Min.
TA =
Typ.
Max.
Unit
0.5
2
mA
1
10
µA
)
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Logic input (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise
specified. Typical values are referred to TA = 25°C)
Symbol
Parameter
VTIL
Input logic threshold low
Test Conditions
T-IN, VHSCI, EN, SHDN
(1)
Input logic threshold high VCC = 3.3V
(1)
VCC = 5V
VTIH
Input leakage current
T-IN, VHSCI, EN, SHDN
IOL
Output leakage current
Receiver disabled
VOL
Output voltage low
IOUT = 1.6mA
VOH
Output voltage high
IOUT = -1mA
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1. Transmitter input hysteresis is typically 250mV
Table 5.
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Typ.
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2.4
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VCC0.6
Unit
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Max.
V
V
V
± 0.01
± 1.0
µA
± 0.05
± 10
µA
0.4
V
VCC0.1
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Transmitter (C1 - C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C,
unless otherwise specified. Typical values are referred to TA = 25°C)
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Min.
Test conditions
Min.
Typ.
Output voltage swing
All transmitter outputs are loaded with
3KΩ to GND
±5
± 5.4
V
RTOUT
Transmitter output
resistance
VCC = V+ = V- = 0VVOUT = ± 2V
3000
W
ISC
Output short circuit
current
so
VTOUT
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6/15
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Parameter
± 25
Max.
± 60
Unit
mA
ST3237
Table 6.
Electrical characteristics
Receiver (C1 - C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C, unless
otherwise specified. Typical values are referred to TA = 25°C)
Symbol
Parameter
Test Conditions
VRIN
Receiver input voltage
operating range
VRIL
RS-232 input threshold
low
TA = 25°C, VCC = 3.3V
TA = 25°C, VCC = 5V
VRIH
RS-232 input threshold
high
TA = 25°C, VCC = 3.3V
TA = 25°C, VCC = 5V
VRIHYS
Input hysteresis
RRIN
Input resistance
Table 7.
Min.
-25
0.6
0.8
TA = 25°C
Parameter
3
tR_SKEW
Receiver skew
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RL = 3KΩCL= 250pF
one transmitter switching, VHSCI=VCC
VCC= 3 to 5.55V
)-
2.4
2.4
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7
KΩ
Pr
tODR
Receiver output disable
time
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Transition slew rate
Typ.
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Max.
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1000
Unit
Kbps
Kbps
µs
100
ns
|tPHL - tTLH|, VHSCI=VCC
60
ns
|tPHL - tTLH|
50
ns
Normal operation
80
ns
Normal operation
130
ns
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|tPHL - tTLH|, VHSCI=GND
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Receiver output enable
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Test Conditions
Propagation delay input to
RIN to ROUT, CL = 150pF
output
Transmitter skew
Note:
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tT_SKEW
SRT
25
0.3
Maximum data rate
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Unit
1.2
1.5
1.5
1.8
RL = 3KΩCL= 1000pF
one transmitter switching, VHSCI=GND
tPHLR
tPLHR
Max.
Timing characteristics (C1 - C4 = 0.1mF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40
to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C)
Symbol
DR
Typ.
VCC =
TA = 25°C RL = 3 to 7KΩ
3.3V
measured from +3V to -3V or -3V to +3V
CL = 150pF to 1000pF, VHSCI=GND
CL = 150pF to 1000pF, VHSCI=VCC
CL = 150pF to 2500pF, VHSCI=GND
6
24
4
30
150
30
V/µs
V/µs
V/µs
Transmitter Skew is measured at the transmitter zero cross points
7/15
Application circuit
ST3237
4
Application circuit
Figure 2.
Application circuits
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Table 8.
8/15
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
0.1
ST3237
Typical performance characteristics
5
Typical performance characteristics
Figure 3.
(unless otherwise specified TJ = 25°C)
Input voltage range TJ =25°C
Figure 4.
Transfer characteristics for
transmitter
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Figure 5.
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Transfer characteristics for receiver Figure 6.
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Figure 7.
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Output current vs output high
voltage
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Transfer characteristics for
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Figure 8.
Output current vs output low
voltage
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9/15
Typical performance characteristics
Figure 9.
ST3237
Receiver input resistance
ZZZ
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ST3237
Package mechanical data
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in
ECOPACK® packages. These packages have a Lead-free second level
interconnect. The category of second level interconnect is marked on the package
and on the inner box label, in compliance with JEDEC Standard JESD97. The
maximum ratings related to soldering conditions are also marked on the inner box
label. ECOPACK is an ST trademark. ECOPACK specifications are available at:
www.st.com.
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11/15
Package mechanical data
ST3237
SSOP28 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MIN.
A1
0.050
A2
1.65
b
0.002
0.065
0.22
0.38
0.009
c
0.09
0.25
0.004
D
9.9
10.2
10.5
0.390
E
7.4
7.8
8.2
0.291
E1
5
5.3
5.6
1.75
0˚
bs
L
0.55
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10˚
0.95
0.069
0.022
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0.402
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0.307
0.010
0.413
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0.209
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0.220
0.0256 BSC
P
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0˚
0.073
0.015
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0.197
0.65 BSC
K
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MAX.
0.079
1.85
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TYP.
2
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12/15
MAX.
0.030
10˚
0.037
ST3237
Package mechanical data
Tape & Reel SSOP28 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
A
MIN.
MAX.
330
13.2
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
0.504
0.519
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22.4
Ao
8.4
8.6
0.331
Bo
10.7
10.9
0.421
Ko
2.9
3.1
0.114
Po
3.9
4.1
0.153
P
11.9
12.1
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0.882
0.339
0.429
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0.161
0.476
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13/15
Revision history
ST3237
7
Revision history
Table 9.
Revision history
Date
Revision
Description of Changes
21-Mar-2005
5
TSSOP has been removed.
24-Mar-2006
6
Order codes has been updated and new template.
25-Oct-2006
7
Order codes has been updated.
16-Jan-2007
8
The DR min. value on Table 7. has been corrected: 100kbps ==> 1000kbps.
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ST3237
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Please Read Carefully:
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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.
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All ST products are sold pursuant to ST’s terms and conditions of sale.
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Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
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No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
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UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
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Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
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ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
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