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April 2003
s
ESD PROTECTIO FOR RS-232 I/O PINS
15KV HUMAN BODY MODEL
8KV IEC 1000-4-2 CONTACT DISCHARGE
s
300
A SUPPLY CURRENT
s
250Kbps MINIMUM GUARENTEED DATA
RATE
s
6V/
s MINIMUM GUARANTEED SLEW RATE
s
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
s
AVAILABLE IN DIP-16, SO-16, SO-16 LARGE
SSOP16 AND TSSOP16
DESCRIPTION
The ST3232E is a 3V powered EIA/TIA-232 and
V.28/V.24 communication interfaces with low
power requirements, high data-rate capabilities
and enhanced electrostatic discharge (ESD)
protection to 8kV using IEC1000-4-2 Contact
Discharge and 15kV using the Human Body
Model. ST3232E has a proprietary low dropout
transmitter output stage providing true RS-232
performance from 3 to 5V supplies witha a dual
charge pump. The charge pump requires only four
small 0.1
F standard external capacitors for
operations from 3V supply.
The ST3232E has two receivers and two drivers.
The device is guaranteed to run at data rates of
250Kbps while maintaining RS-232 output levels.
Typical applications are Notebook, Subnotebook
and Palmtop Computers, Battery Powered
Equipment, Hand-Held Equipment, Peripherals
and Printers.
ORDERING CODES
Type
Temperature
Range
Package
Comments
ST3232ECN
0 to 70 C
DIP-16
25parts per tube / 40tube per box
ST3232EBN
-40 to 85 C
DIP-16
25parts per tube / 40tube per box
ST3232ECD
0 to 70 C
SO-16 (Tube)
50parts per tube / 20tube per box
ST3232EBD
-40 to 85 C
SO-16 (Tube)
50parts per tube / 20tube per box
ST3232ECDR
0 to 70 C
SO-16 (Tape & Reel)
2500 parts per reel
ST3232EBDR
-40 to 85 C
SO-16 (Tape & Reel)
2500 parts per reel
ST3232ECW
0 to 70 C
SO-16 Large (Tube)
50parts per tube / 20tube per box
ST3232EBW
-40 to 85 C
SO-16 Large (Tube)
50parts per tube / 20tube per box
ST3232ECWR
0 to 70 C
SO-16 Large (Tape & Reel)
1000 parts per reel
ST3232EBWR
-40 to 85 C
SO-16 Large (Tape & Reel)
1000 parts per reel
ST3232ECPR
0 to 70 C
SSOP16 (Tape & Reel)
1350 parts per reel
ST3232EBPR
-40 to 85 C
SSOP16 (Tape & Reel)
1350 parts per reel
ST3232ECTR
0 to 70 C
TSSOP16 (Tape & Reel)
2500 parts per reel
ST3232EBTR
-40 to 85 C
TSSOP16 (Tape & Reel)
2500 parts per reel
ST3232E
15KV ESD-PROTECTED, 3 TO 5.5V, LOW POWER,
UP TO 250KBPS, RS-232 DRIVERS AND RECEIVERS
SOP Large
DIP
SOP
TSSOP
SSOP
ST3232E
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PIN CONFIGURATION
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
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.
PlN N
SYMBOL
NAME AND FUNCTION
1
C
1
+
Positive Terminal for the first Charge Pump Capacitor
2
V+
Doubled Voltage Terminal
3
C
1
-
Negative Terminal for the first Charge Pump Capacitor
4
C
2
+
Positive Terminal for the second Charge Pump Capacitor
5
C
2
-
Negative Terminal for the second Charge Pump Capacitor
6
V-
Inverted Voltage Terminal
7
T2
OUT
Second Transmitter Output Voltage
8
R2
IN
Second Receiver Input Voltage
9
R2
OUT
Second Receiver Output Voltage
10
T2
IN
Second Transmitter Input Voltage
11
T1
IN
First Transmitter Input Voltage
12
R1
OUT
First Receiver Output Voltage
13
R1
IN
First Receiver Input Voltage
14
T1
OUT
First Transmitter Output Voltage
15
GND
Ground
16
V
CC
Supply Voltage
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.3 to 6
V
V+
Doubled Voltage Terminal
(V
CC
- 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
R
IN
Receiver Input Voltage Range
25
V
T
OUT
Transmitter Output Voltage Range
13.2
V
R
OUT
Receiver Output Voltage Range
-0.3 to (V
CC
+ 0.3)
V
t
SHORT
Transmitter Output Short to GND Time
Continuous
ST3232E
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ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, T
A
= -40 to 85C, unless otherwise specified.
Typical values are referred to T
A
= 25C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, T
A
= -40 to 85C, unless otherwise specified.
Typical values are referred to T
A
= 25C)
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F tested at V
CC
= 3V to 5.5V, T
A
= -40 to 85C, unless otherwise specified.
Typical values are referred to T
A
= 25C)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
ESD
ESD Protection Voltage
Human Body Model
15
kV
ESD
ESD Protection Voltage
IEC-1000-4-2
8
kV
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
SUPPLY
V
CC
Power Supply Current
No Load V
CC
= 3V or 5V T
A
= 25C
0.3
1
mA
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
TIL
Input Logic Threshold Low
T-IN
0.8
V
V
HYS
Transmitter Input
Histeresys
0.25
V
V
TIH
Input Logic Threshold High
V
CC
= 3.3V
2
V
V
CC
= 5V
2.4
I
IL
Input Leakage Current
T-IN
0.01
1
A
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
TOUT
Output Voltage Swing
All Transmitter outputs are loaded with
3K
to GND
5
5.4
V
R
TOUT
Transmitter Output
Resistance
V
CC
= V+ = V- = 0V
V
OUT
=
2V
300
10M
I
TSC
Output Short Circuit
Current
60
mA
I
TOL
Output Leakage Current
V
CC
= 0V or 3V to 5.5V V
OUT
=
12V
Transmitters Disable
25
A
ST3232E
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RECEIVER ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F tested at V
CC
= 3V to 5.5V, T
A
= -40 to 85C, unless otherwise specified.
Typical values are referred to T
A
= 25C)
TIMING CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, T
A
= -40 to 85C, unless otherwise specified.
Typical values are referred to T
A
= 25C)
Transmitter Skew is measured at the transmitter zero cross points
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
T
A
= 25C
V
CC
= 3.3V
0.6
1.1
V
T
A
= 25C
V
CC
= 5V
0.8
1.5
V
RIH
RS-232 Input Threshold
High
T
A
= 25C
V
CC
= 3.3V
1.4
2.4
V
T
A
= 25C
V
CC
= 5V
1.8
2.4
V
RIHYS
Input Hysteresis
0.5
V
R
RIN
Input Resistance
T
A
= 25C
3
5
7
K
V
ROL
TTL/CMOS Output Voltage
Low
I
OUT
= 1.6mA
0.4
V
V
ROH
TTL/CMOS Output Voltage
High
I
OUT
= -1mA
V
CC
-0.6 V
CC
-0.1
V
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
D
R
Data Transfer Rate
R
L
= 3K
C
L2
= 1000pF
one trasmitter switching
250
Kbps
t
PHLR
t
PLHR
Propagation Delay Input to
Output
R
XIN
= R
XOUT
C
L
= 150pF
0.15
s
t
OER
Receiver Output Enable
Time
Normal Operation
50
ns
t
ODR
Receiver Output Disable
Time
Normal Operation
50
ns
|t
PHLT
- t
THL
|
Transmitter Propagation
Delay Difference
(Note 1)
200
ns
|t
PHLR
- t
THR
|
Receiver Propagation Delay
Difference
50
ns
S
RT
Trnasition Slew Rate
T
A
= 25C R
L
= 3K
to 7K
V
CC
= 3.3V
measured from +3V to -3V or -3V to +3V
C
L
= 150pF to 1000pF
C
L
= 150pF to 2500pF
6
4
30
30
V/
s
V/
s
ST3232E
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APPLICATION CIRCUITS
CAPACITANCE VALUE (
F)
V
CC
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
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