ST3237E
±15KV ESD-PROTECTED, 1µA, 3 TO 5.5V, 250KBPS,
RS-232 TRANSCEIVER WITH STAND-BY
I
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I
I
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EDS PROTECTION FOR RS-232 I/O PINS:
±15KV HUMAN BODY MODEL
±8KV IEC 1000-4-2 CONTACT DISCHARGE
1µA LOW POWER SHUTDOWN WITH
RECEIVERS ACTIVE
GUARENTEED DATA RATE
250Kbps (Normal Operation)
1Mbps (Very High Speed Operation)
GUARANTEED SLEW RATE RANGE
6V/µs (Normal Operation)
24V/µs (Very High Speed Operation)
0.1µF EXTERNAL CAPACITORS
FLOW-THROUGH PINOUT
AVAILABLE IN SO-28 AND SSOP-28
LOW SUPPLY CURRENT 300µA
SSOP
SOP
DESCRIPTION
The ST3237E is a 3V to 5.5V powered EIA/
TIA-232 and V.28/V.24 communication interfaces
high data-rate capability and enhanced
electrostatic discharge (ESD) protection at ±8KV
using IEC1000-4-2 contact discharge and ±15kV
using Human Body Model (HBM). The other pins
are protected with standard ESD protection at
Table 1: Order Codes
Type
ST3237ECD
ST3237EBD
ST3237ECDR
ST3237EBDR
ST3237ECPR
ST3237EBPR
Temperature
Range
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
Package
±2kV using HBM method. The ST3237C 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
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.
Comments
27parts per tube / 12tube per box
27parts per tube / 12tube per box
1000 parts per reel
1000 parts per reel
1350 parts per reel
1350 parts per reel
SO-28 (Tube)
SO-28 (Tube)
SO-28 (Tape & Reel)
SO-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
March 2005
Rev. 5
1/15
ST3237E
Table 2: Pin Description
PlN N°
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SYMBOL
C
2
+
GND
C
2
-
V-
T1
OUT
T2
OUT
T3
OUT
R1
IN
R2
IN
T4
OUT
R3
IN
T5
OUT
EN
SHDN
VHSCI
R1
OUTB
T5
IN
R3
OUT
T4
IN
R2
OUT
R1
OUT
T3
IN
T2
IN
T1
N
C
1
-
V
CC
V+
C
1
+
NAME AND FUNCTION
Positive Terminal of Inverting Charge Pump Capacitor
Ground
Negative Terminal of Inverting Charge Pump Capacitor
-5.5V Generated by the Charge Pump
First Transmitter Output Voltage
Second Transmitter Output Voltage
Third Transmitter Output Voltage
First Receiver Input Voltage
Second Receiver Input Voltage
Fourth Transmitter Output Voltage
Third Receiver Input Voltage
Fifth Transmitter Output Voltage
Receiver Enable, Active Low
Shutdown Control, Active Low
Very High Speed Control Input. Connected to GND for normal
operation; connected to VCC for 1Mbps transmission rates.
Non Inverting Complementary Receiver Output. Always Active.
Fifth Transmitter Input Voltage
Third Receiver Output Voltage
Fourth Transmitter Input Voltage
Second Receiver Output Voltage
First Receiver Output Voltage
Third Transmitter Input Voltage
Second Transmitter Input Voltage
First Transmitter Input Voltage
Negative Terminal of Voltage-Doubler Charge Pump Capacitor
Supply Voltage
5.5V Generated by the Charge Pump
Positive Terminal of Voltage-Doubler Charge Pump Capacitor
2/15
ST3237E
Figure 1: Pin Configuration
Table 3: Absolute Maximum Ratings
Symbol
V
CC
V+
V-
V+ +|V-|
T
IN
SHDN, EN
VHSCI
R
IN
T
OUT
t
SHORT
T
stg
Very High Speed Control Input
Receiver Input Voltage Range
Transmitter Output Voltage Range
Short Circuit Duration on T
OUT
(one at a time)
Storage Temperature Range
Supply Voltage
Doubled Voltage Terminal
Inverted Voltage Terminal
Transmitter Input Voltage Range
Parameter
Value
-0.3 to 6
-0.3 to 7
0.3 to -7
13
-0.3 to 6
-0.3 to 6
-0.3 to (V
CC
+0.3)
±
25
±
13.2
-0.3 to (V
CC
+ 0.3)
Continuous
-65 to 150
°C
Unit
V
V
V
V
V
V
V
V
V
V
R
OUT
, R
OUTB
Receiver Output Voltage Range
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.
Table 4: Shutdown And Enable Control Truth Table
SHDN
0
0
1
1
EN
0
1
0
1
T-OUT
High Z
High Z
Active
Active
R-OUT
Active
High Z
Active
High Z
R-OUTB
Active
Active
Active
Active
Table 5: ESD Performance: Transmitter Outputs, Receiver Inputs
Symbol
ESD
ESD
Parameter
ESD Protection Voltage
ESD Protection Voltage
Test Conditions
Human Body Model
IEC-1000-4-2 Contact Discharge
Min.
±15
±8
Typ.
Max.
Unit
kV
kV
3/15
ST3237E
Table 6: Electrical Characteristics
(C
1
- C
4
= 0.1µF, V
CC
= 3V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Symbol
I
SHDN
Parameter
SHDN=V
CC
Shutdown Supply Current
Test Conditions
No Load
SHDN=GNDV
T_IN
=GND or V
CC
Min.
Typ.
0.3
1
Max.
1
5
Unit
mA
µA
I
SUPPLY
V
CC
Power Supply Current
Table 7: Logic Input Electrical Characteristics
(C
1
- C
4
= 0.1µF, V
CC
= 3V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Symbol
V
TIL
V
TIH
I
IL
V
HYS
Parameter
Input Logic Threshold Low
(Note 1)
Input Logic Threshold High
Input Leakage Current
Transmitter Input
Hysteresis
Test Conditions
T-IN, VHSCI, EN, SHDN
T-IN, VHSCI, EN, SHDN
T-IN, VHSCI, EN, SHDN
0.25
V
CC
= 3.3V
V
CC
= 5V
2
2.4
±
1.0
µA
V
Min.
Typ.
Max.
0.8
Unit
V
V
Note 1: Transmitter input hysteresis is typically 250mV
Table 8: Transmitter Electrical Characteristics
(C
1
- C
4
= 0.1µF tested at 3.3V±10%, V
CC
= 3V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Symbol
V
TOUT
R
TOUT
I
SC
I
TOL
Parameter
Output Voltage Swing
Test Conditions
Min.
±
5
300
Typ.
±
5.4
10M
±
60
V
CC
= 0V or 3.3V to 5.5V V
OUT
=
±
12V
Transmitters Disable
±
25
Max.
Unit
V
Ω
mA
µA
All Transmitter outputs are loaded with
3KΩ to GND
Transmitter Output Resistance V
CC
= 0V
V
OUT
=
±
2V
Output Short Circuit Current
Output Leakage Current
Table 9: Receiver Electrical Characteristics
(C
1
- C
4
= 0.1µF tested at 3.3V±10%, V
CC
= 3V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Symbol
I
OL
V
OL
V
OH
V
RIN
V
RIL
V
RIH
Parameter
Output Leakage Current
Output Voltage Low
Output Voltage High
Receiver Input Voltage
Operating Range
RS-232 Input Threshold
Low
RS-232 Input Threshold
High
I
OUT
= 1mA
I
OUT
= -1mA
V
CC
-0. V
CC
-0.1
6
-25
0.6
0.8
1.1
1.5
1.5
1.2
0.3
T
A
= 25°C
3
5
7
2.4
2.4
V
KΩ
V
Test Conditions
Receiver Disabled
EN = V
CC
Min.
Typ.
±
0.05
Max.
±
10
0.4
Unit
µA
V
V
25
V
V
T
A
= 25°C V
CC
= 3.3V
T
A
= 25°C V
CC
= 5V
T
A
= 25°C V
CC
= 3.3V
T
A
= 25°C V
CC
= 5V
V
RIHYS
Input Hysteresis
R
RIN
4/15
Input Resistance
ST3237E
Table 10: Timing Characteristics
(C
1
- C
4
= 0.1µF tested at 3.3V±10%, V
CC
= 3V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Symbol
D
R
Parameter
Maximum Data Rate
Test Conditions
R
L
= 3KΩ C
L
= 1000pF
one transmitter switching
VHSCI=GND
R
L
= 3KΩ C
L
= 250pF
one transmitter switching
VHSCI=V
CC
V
CC
= 3 to 4.5V
R
L
= 3KΩ C
L
= 1000pF
one transmitter switching
VHSCI=V
CC
V
CC
= 4.5 to 5.5V
t
PHLR
t
PLHR
t
PHLR
t
PLHR
Propagation Delay Input to
Output
Propagation Delay Input to
Output
R
IN
to R
OUT
R
L
= 3kΩ
VHSCI=V
CC
VHSCI=GND
|t
PHL
- t
TLH
|
|t
PHL
- t
TLH
|
t
R_SKEW
Receiver Skew
t
OER
t
ODR
S
RT
Receiver Output Enable
Time
Receiver Output Disable
Time
Transition Slew Rate
|t
PHL
- t
TLH
|
Normal Operation
Normal Operation
T
A
= 25°C R
L
= 3 to 7KΩ
V
CC
= 3.3V
measured from +3V to -3V or -3V to +3V
C
L
= 150pF to 1000pF
VHSCI=GND
C
L
= 150pF to 1000pF
VHSCI=V
CC
C
L
= 150pF to 2500pF
VHSCI=GND
C
L
= 150pF
C
L
= 1000pF
400
1000
VHSCI=GND
VHSCI=V
CC
300
50
100
50
120
ns
ns
ns
ns
ns
ns
ns
Min.
250
Typ.
Max.
Unit
Kbps
1000
Kbps
1000
Kbps
0.15
µs
t
T_SKEW
Transmitter Skew
6
24
4
30
150
30
V/µs
V/µs
V/µs
Transmitter Skew is measured at the transmitter zero cross points
5/15
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