ST3237
3 TO 5.5V, 250KBPS, RS-232
TRANSCEIVER WITH STAND-BY
s
s
s
s
s
s
s
s
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
500µA LOW SUPPLY CURRENT
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
AVAILABLE IN SO-28, SSOP-28 AND
TSSOP28
SSOP
SOP
DESCRIPTION
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
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
ORDERING CODES
Type
ST3237CD
ST3237BD
ST3237CDR
ST3237BDR
ST3237CPR
ST3237BPR
ST3237CTR (*)
ST3237BTR (*)
(*) Available on request
TSSOP
operation mode and 1Mbps in the very high speed
operation mode while maintaning RS-232 output
levels.
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
0 to 70 °C
-40 to 85 °C
Package
SO-28 (Tube)
SO-28 (Tube)
SO-28 (Tape & Reel)
SO-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
TSSOP28 (Tape & Reel)
TSSOP28 (Tape & Reel)
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
2500 parts per reel
2500 parts per reel
May 2002
1/12
ST3237
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. Connect to GND for normal
operation; connect 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- Charge Pump Capacitor
Supply Voltage
-5.5V Generated by the Charge Pump
Positive Terminal of Voltage- Charge Pump Capacitor
2/12
ST3237
PIN CONFIGURATION
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 Durtion 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.
3/12
ST3237
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
No Load
Shutdown Supply Current
Test Conditions
V
CC
= 3V or 5.0V
T
A
= 25°C
SHDN=GND T
A
= 25°C
Min.
Typ.
0.5
1
Max.
2
10
Unit
mA
µA
I
SUPPLY
V
CC
Power Supply Current
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
Parameter
Input Logic Threshold Low
(Note 1)
Input Logic Threshold High
(Note 1)
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
Test Conditions
T-IN, VHSCI, EN, SHDN
V
CC
= 3.3V
V
CC
= 5V
T-IN, VHSCI, EN, SHDN
Receiver Disabled
I
OUT
= 1.6mA
I
OUT
= -1mA
V
CC
-0.6 V
CC
-0.1
2
2.4
Min.
Typ.
Max.
0.8
Unit
V
V
V
±
0.01
±
0.05
±
1.0
±
10
0.4
µA
µA
V
V
I
OL
V
OL
V
OH
Note 1: Transmitter input hysteresis is typically 250mV
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
Parameter
Output Voltage Swing
Transmitter Output
Resistance
Output Short Circuit Current
Test Conditions
All Transmitter outputs are loaded with
3KΩ to GND
V
CC
= V+ = V- = 0V
V
OUT
=
±
2V
Min.
±
5
Typ.
±
5.4
3000
±
25
±
60
Max.
Unit
V
Ω
mA
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
V
RIN
V
RIL
V
RIH
Parameter
Receiver Input Voltage
Operating Range
RS-232 Input Threshold
Low
RS-232 Input Threshold
High
Test Conditions
Min.
-25
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
V
CC
= 3.3V
V
CC
= 5V
V
CC
= 3.3V
V
CC
= 5V
3
0.6
0.8
1.2
1.5
1.5
1.8
0.3
5
7
2.4
2.4
Typ.
Max.
25
Unit
V
V
V
V
V
V
KΩ
V
RIHYS
Input Hysteresis
R
RIN
Input Resistance
4/12
ST3237
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 trasmitter switching VHSCI=GND
R
L
= 3KΩ
C
L
= 250pF
one trasmitter switching VHSCI=V
CC
V
CC
= 3 to 5.55V
R
IN
to R
OUT
|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
VHSCI=GND
VHSCI=V
CC
Min.
250
100
Typ.
Max.
Unit
Kbps
Kbps
t
PHLR
t
PLHR
Propagation Delay Input to
Output
0.15
100
60
50
80
130
µs
ns
ns
ns
ns
ns
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
5/12
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