SGS Thomson Microelectronics ST3237CPR, ST3237CDR, ST3237CD, ST3237BTR, ST3237BPR Datasheet
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1/12May 2002
■ 1µA LOW POWER SHUTDOWN WITH
RECEIVER S ACT I VE
■ 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
■ A VAIL ABL E IN SO-2 8 , SSOP-28 AND
TSSOP28
DESCRIPTION
The ST3237 is a 3V to 5.5V powered EIA/TIA-232
and V.28/V.24 communication interfaces high
data-rat e capabilit ies. ST32 37 is a tra nsceive r (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 whi le maintaning RS-232 output
levels.
ORDERING CODES
(*) Avai l abl e on request
Type
Temperature
Range
Package Comments
ST3237CD 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3237BD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3237CDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3237BDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3237CPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3237BPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3237CTR (*) 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel
ST3237BTR (*) -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel
ST3237
3 TO 5.5V, 250KBPS, RS-232
TRANSCEIVER WITH STAND-BY
SSOP
SOP
TSSOP
ST3237
2/12
PIN DESCRIPTION
PlN N° SYMBOL NAME AND FUNCTION
1
C
2
+ Positive Terminal of Inverting Charge Pump Capacitor
2 GND Ground
3
C
2
- Negative Terminal of Inverting Charge Pump Capacitor
4 V- 5.5V Generated by the Charge Pump
5
T1
OUT
First Transmitter Output Voltage
6
T2
OUT
Second Transmitter Output Voltage
7
T3
OUT
Third Transmitter Output Voltage
8
R1
IN
First Receiver Input Voltage
9
R2
IN
Second Receiver Input Voltage
10
T4
OUT
Fourth Transmitter Output Voltage
11
R3
IN
Third Receiver Input Voltage
12
T5
OUT
Fifth Transmitter Output Voltage
13 EN
Receiver Enable, Active Low
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
R1
OUTB
Non Inverting Complementary Receiver Output. Always Active.
17
T5
IN
Fifth Transmitter Input Voltage
18
R3
OUT
Third Receiver Output Voltage
19
T4
IN
Fourth Transmitter Input Voltage
20
R2
OUT
Second Receiver Output Voltage
21
R1
OUT
First Receiver Output Voltage
22
T3
IN
Third Transmitter Input Voltage
23
T2
IN
Second Transmitter Input Voltage
24
T1
N
First Transmitter Input Voltage
25
C
1
- Negative Terminal of Voltage- Charge Pump Capacitor
26
V
CC
Supply Voltage
27 V+ -5.5V Generated by the Charge Pump
28
C
1
+ Positive Terminal of Voltage- Charge Pump Capacitor
ST3237
3/12
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition i s
not implied. V+ and V- can have a maximum magnitude of +7V, but their absolute addition can not exceed 13 V.
Symbol Parameter Value Unit
V
CC
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-| 13 V
T
IN
Transmitter Input Voltage Range
-0.3 to 6 V
SHDN
, EN -0.3 to 6 V
VHSCI
Very High Speed Control Input -0.3 to (V
CC
+0.3)
V
R
IN
Receiver Input Voltage Range
±
25 V
T
OUT
Transmitter Output Voltage Range
±
13.2 V
R
OUT ROUTB
Receiver Output Voltage Range -0.3 to (VCC + 0.3)
V
t
SHORT
Short Circuit Durtion on T
OUT
(one at a time)
Continuous
T
stg
Storage Temperature Range
-65 to 150 °C
ST3237
4/12
ELECTRICAL CHARACTERISTICS
(C
1
- C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS
(C
1
- C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to T
A
= 25°C)
Note 1: Transmitter input hysteresis is ty pi cally 250mV
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C
1
- 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 T
A
= 25°C)
RECEIVER ELECTRICAL CHARACTERISTICS
(C
1
- 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 T
A
= 25°C)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
SUPPLYVCC
Power Supply Current No Load VCC = 3V or 5.0V TA = 25°C 0.5 2 mA
I
SHDN
Shutdown Supply Current SHDN=GND TA = 25°C 1 10
µ
A
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
TIL
Input Logic Threshold Low
(Note 1)
T-IN, VHSCI, EN, SHDN 0.8 V
V
TIH
Input Logic Threshold High
(Note 1)
VCC = 3.3V
V
CC
= 5V
2
2.4
V
V
I
IL
Input Leakage Current T-IN, VHSCI, EN, SHDN ±
0.01
±
1.0
µ
A
I
OL
Output Leakage Current Receiver Disabled
±
0.05
±
10
µ
A
V
OL
Output Voltage Low I
OUT
= 1.6mA 0.4 V
V
OH
Output Voltage High I
OUT
= -1mA VCC-0.6 VCC-0.1 V
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
TOUT
Output Voltage Swing All Transmitter outputs are loaded with
3KΩ to GND
±
5
±
5.4 V
R
TOUT
Transmitter Output
Resistance
VCC = V+ = V- = 0V V
OUT
= ± 2V 3000
Ω
I
SC
Output Short Circuit Current
±
25
±
60 mA
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
RIN
Receiver Input Voltage
Operating Range
-25 25 V
V
RIL
RS-232 Input Threshold
Low
TA = 25°C VCC = 3.3V
T
A
= 25°C VCC = 5V
0.6
0.8
1.2
1.5
V
V
V
RIH
RS-232 Input Threshold
High
TA = 25°C VCC = 3.3V
T
A
= 25°C VCC = 5V
1.5
1.8
2.4
2.4
V
V
V
RIHYS
Input Hysteresis 0.3 V
R
RIN
Input Resistance TA = 25°C 3 5 7 K
Ω
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