1/13
March 2004
s
ESD PROTECTION FOR RS-232 I/O PINS:
8KV IEC 1000-4-2 CONTACT DISCHARGE
15KV HUMAN BODY MODEL
s
1
A SUPPLY CURRENT ACHIEVED WHEN
IN AUTO-POWERDOWN
s
250Kbps MINIMUM GUARANTEED DATA
RATE
s
GUARANTEED 6V/
s SLEW RATE RANGE
s
GUARANTEED MOUSE DRIVEABILITY
s
0.1
F EXTERNAL CAPACITORS
s
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
s
AVAILABLE IN SO-28, SSOP28 AND
TSSOP28 PACKAGES
DESCRIPTION
The ST3241E device consists of 3 drivers, 5
receivers and a dual charge-pump circuit. The
device meets the requirements of EIA/TIA and
V.28/V.24 communication standards providing
high
data
rate
capability
and
enhanced
electrostatic
discharge
(ESD)
protection.
All
transmitter
outputs
and
receiver
input
are
protected to 8KV USING IEC 1000-4-2 contact
discharge and 15KV using the Human Body
Model. The receiver R2 is always active to
implement a wake-up feature for serial port.
The ST3241E has a proprietary low-dropout
transmitter output stage enabling true RS-232
performance from a 3.0V to 5.5V supply with a
dual charge pump. The device is guaranteed to
run at data rates of 250kbps while maintaining
RS-232 output levels.
It is a complete serial port (3 drivers, 5 receivers)
intended for notebook or subnotebook computers.
Receivers R1 and R2 have extra outputs in
addition to their standard outputs. These extra
output are always active.
Typical application are in notebook, subnotebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.
ST3241E
15KV ESD PROTECTED 3 TO 5.5V, 400KBPS,
RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
SSOP
SOP
TSSOP
ST3241E
2/13
ORDERING CODES
PIN DESCRIPTION
Type
Temperature
Range
Package
Comments
ST3241ECD
0 to 70C
SO-28 (Tube)
27parts per tube / 12tube per box
ST3241EBD
-40 to 85C
SO-28 (Tube)
27parts per tube / 12tube per box
ST3241ECDR
0 to 70C
SO-28 (Tape & Reel)
1000 parts per reel
ST3241EBDR
-40 to 85C
SO-28 (Tape & Reel)
1000 parts per reel
ST3241ECPR
0 to 70C
SSOP-28 (Tape & Reel)
1350 parts per reel
ST3241EBPR
-40 to 85C
SSOP-28 (Tape & Reel)
1350 parts per reel
ST3241ECTR
0 to 70C
TSSOP28 (Tape & Reel)
2500 parts per reel
ST3241EBTR
-40 to 85C
TSSOP28 (Tape & Reel)
2500 parts per reel
PlN N
SYMBOL
NAME AND FUNCTION
1
C
2
+
Positive Terminal of Inverting Charge Pump Capacitor
2
C
2
-
Negative Terminal of Inverting Charge Pump Capacitor
3
V-
-5.5V Generated by the Charge Pump
4
R1
IN
First Receiver Input Voltage
5
R2
IN
Second Receiver Input Voltage
6
R3
IN
Third Receiver Input Voltage
7
R4
IN
Fourth Receiver Input Voltage
8
R5
IN
Fifth Receiver Input Voltage
9
T1
OUT
First Transmitter Output Voltage
10
T2
OUT
Second Transmitter Output Voltage
11
T3
OUT
Third Transmitter Output Voltage
12
T3
IN
Third Transmitter Input Voltage
13
T2
IN
Second Transmitter Input Voltage
14
T1
IN
First Transmitter Input Voltage
15
R5
OUT
Fifth Receiver Output Voltage
16
R4
OUT
Fourth Receiver Output Voltage
17
R3
OUT
Third Receiver Output Voltage
18
R2
OUT
Second Receiver Output Voltage
19
R1
OUT
First Receiver Output Voltage
20
R2
OUTB
Non-inverting Complementary Receiver Output, always active
for wake-up
21
R1
OUTB
Non-inverting Complementary Receiver Output, always active
for wake-up
22
SHDN
Shutdown Control. Active Low.
23
EN
Receiver Enable. Active Low
24
C
1
-
Negative Terminal of Voltage- Charge Pump Capacitor
25
GND
Ground
26
V
CC
Supply Voltage
27
V+
5.5V Generated by the Charge Pump
28
C
1
+
Positive Terminal of Voltage- Charge Pump Capacitor
ST3241E
3/13
PIN CONFIGURATION
SHUTDOWN AND ENABLE CONTROL TRUTH TABLE
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.
Note 1: V+ and V- can have magnitude of 7V, but their absolute difference cannot exceed 13V
SHDN
EN
T
OUT
R
OUT
R
OUTB
0
0
HIGH Z
ACTIVE
ACTIVE
0
1
HIGH Z
HIGH Z
ACTIVE
1
0
ACTIVE
ACTIVE
ACTIVE
1
1
ACTIVE
HIGH Z
ACTIVE
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.3 to 6
V
V+
Extra Positive Voltage (Note 1)
(V
CC
-0.3) to 7
V
V-
Extra negative Voltage (Note 1)
0.3 to -7
V
V+ +|V-|
(Note 1)
13
V
SHDN, EN,
T
IN
Input Voltage
-0.3 to 6
V
R
IN
Receiver Input Voltage Range
25
V
T
OUT
Transmitter Output Voltage Range
13.2
V
R
OUT
R
OUTB
INVALID
Receiver Output Voltage Range
-0.3 to (V
CC
+ 0.3)
V
t
SHORT
Short Circuit Duration on T
OUT
(one at a time)
Continuous
T
stg
Storage Temperature Range
-65 to 150
C
ST3241E
4/13
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 AND RECEIVER OUTPUT 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)
RECEIVER OUTPUT 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, 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 (Contact Discharge)
8
KV
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
SUPPLY
Supply Current
No load V
CC
= 3.3V or 5V, T
A
= 25C
0.3
1
mA
I
SHDN
Shutdown Supply Current
SHDN = GND, T
A
= 25C
1
10
A
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
TIL
Input Logic Threshold Low
T
IN
, EN, SHDN
0.8
V
V
TIH
Input Logic Threshold High
V
CC
= 3.3V
V
CC
= 5V
2
2.4
V
V
I
IL
Input Leakage Current
T
IN
, EN, SHDN
0.01
1.0
A
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
OL
Output Leakage Current
R
OUT
, EN, Receiver Disabled
0.05
10
A
V
OL
Output Voltage Low
I
OUT
= 1.6mA
0.4
V
V
OH
Output Voltage High
I
OUT
= -1mA
V
CC
-0.6 V
CC
-0.1
V
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
OUT
Output Resistance
V
CC
= V+ = V- = 0V
V
OUT
=
2V
300
10M
I
SC
Output Short Circuit Current V
CC
= 3.3V
35
60
mA
I
L
Output Leakage Current
V
CC
= 0 to 5.5V, transmitter output =12V,
transmitter disabled
25
A
V
TO
Transmitter Output Voltage
T1IN = T2IN = GND,
T3IN = V
CC
T3OUT loaded with 3K
to GND
T1OUT and T2OUT loaded with 2.5mA
each
5
V
ST3241E
5/13
RECEIVER 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)
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)
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
T
A
= 25C
V
CC
= 5.0V
0.6
0.8
1.2
1.5
V
V
RIH
RS-232 Input Threshold
High
T
A
= 25C
V
CC
= 3.3V
T
A
= 25C
V
CC
= 5.0V
1.5
1.8
2.4
2.4
V
V
RIHYS
Input Hysteresis
0.3
V
R
RIN
Input Resistance
T
A
= 25C
3
5
7
K
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
D
R
Maximum Data Rate
R
L
= 3K
C
L
= 1000pF
one transmitter switching
250
Kbps
t
PHL
t
PLH
Receiver Propagation Delay R
IN
to R
OUT
C
L
= 150pF
0.15
s
t
T_SKEW
Transmitter Skew
100
ns
t
R_SKEW
Receiver Skew
300
ns
S
RT
Transition 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
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