1/11
July 2003
s
ESD PROTECTIO FOR RS-232 I/O PINS
15KV (HUMAN BODY MODEL)
s
LATCHUP FREE
s
1A LOW POWER SHUTDOWN
s
300
A SUPPLY CURRENT
s
250Kbps GUARENTEED DATA RATE
s
20
s TYPICAL TIME TO EXIT SHUTDOWN
s
6V/s GUARANTEED SLEW RATE
s
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
s
PACKAGES: SO-18 AND SSOP-20
DESCRIPTION
The ST3384E is a 3V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements, high data-rate capabilities
and enhanced electrostatic discharge (ESD)
protection. All transmitter outputs and receiver
inputs are protected to 15kV using the Human
Body Model. The ST3384E has a proprietary low
dropout transmitter output stage enabling true
RS-232 performance from 3 to 5.5V supplies with
a dual charge pump. The charge pump require
only four small 0.1F external capacitors for
operation from a 3.3V supply.
The device is guaranteed to run at data rates of
250Kbps while maintaining RS-232 output levels.
The ST3384E has two receivers and two drivers. It
features a 1A shutdown mode that reduces
power consumption and extends battery life in
portable systems.
Typical
applications
are
in
Notebook,
Sub-notebook, and Palmtop Computers, Battery
Powered
Equipment,
Hand-Held
Equipment,
Peripherals, Printers.
ORDERING CODES
Type
Temperature
Range
Package
Comments
ST3384ECD
0 to 70 C
SO-18 (Tube)
50 parts per tube / 20 tube per box
ST3384EBD
-40 to 85 C
SO-18 (Tube)
50 parts per tube / 20 tube per box
ST3384ECDR
0 to 70 C
SO-18 (Tape & Reel)
1000 parts per reel
ST3384EBDR
-40 to 85 C
SO-18 (Tape & Reel)
1000 parts per reel
ST3384ECPR
0 to 70 C
SSOP20 (Tape & Reel)
1350 parts per reel
ST3384EBPR
-40 to 85 C
SSOP20 (Tape & Reel)
1350 parts per reel
ST3384E
15KV ESD-PROTECTED, 3 TO 5.5V, LOW POWER,
UP TO 250KBPS, RS-232 TRANSCEIVER
SO-18
SSOP20
ST3384E
2/11
PIN CONFIGURATION
PIN DESCRIPTION
PlN N
(SO-18)
PlN N
(SSOP20)
SYMBOL
NAME AND FUNCTION
1
1, 10, 11
N.C.
Not Connected
2
2
C
1
+
Positive Terminal for the first Charge Pump
Capacitor
3
3
V+
5.5V Generated By The Charge Pump
4
4
C
1
-
Negative Terminal for the first Charge Pump
Capacitor
5
5
C
2
+
Positive Terminal for the second Charge Pump
Capacitor
6
6
C
2
-
Negative Terminal for the second Charge Pump
Capacitor
7
7
V-
-5.5V Generated By The Charge Pump
8
8
T2
OUT
Second Transmitter Output Voltage
9
9
R2
IN
Second Receiver Input Voltage
10
12
R2
OUT
Second Receiver Output Voltage
11
13
T2
IN
Second Transmitter Input Voltage
12
14
T1
IN
First Transmitter Input Voltage
13
15
R1
OUT
First Receiver Output Voltage
14
16
R1
IN
First Receiver Input Voltage
15
17
T1
OUT
First Transmitter Output Voltage
16
18
GND
Ground
17
19
V
CC
3V to 5.5V Supply Voltage. Connect a 0.1F
capacitor to GND
18
20
SHDN
Active Low Shutdown Control Input. Drive Low To
Shut-down Transmitters, receiver and Charge
Pump
SO-18
SSOP20
ST3384E
3/11
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 cannot exceed 13 V.
Note 1: V+ and V- can have maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
SHUTDOWN TRUTH TABLE
ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, tested at 3.3V 10% C
1
= 0.047F, C
2
- C
4
= 0.33
F tested at 5V
10% -40C < T
A
< 85C unless otherwise noted. 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, tested at 3.3V 10% C
1
= 0.047F, C
2
- C
4
= 0.33
F tested at 5V
10% -40C < T
A
< 85C unless otherwise noted. Typical values are referred to T
A
= 25C)
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage (V
CC
to GND)
-0.3 to 6
V
V+
Doubled Voltage Terminal (V+ to GND) (Note 1)
(V
CC
- 0.3) to 7
V
V-
Inverted Voltage Terminal (V- to GND) (Note 1)
0.3 to -7
V
V+ +|V-|
(Note 1)
13
V
T
IN
Transmitter Input Voltage
-0.3 to 6
V
SHDN
Shutdown Input Voltage (SHDN to GND)
-0.3 to 6
V
R
IN
Receiver Input Voltage (R
IN
to GND)
25
V
T
OUT
Transmitter Output Voltage (T
OUT
to GND)
13.2
V
R
OUT
Receiver Output Voltage
-0.3 to (V
CC
+ 0.3)
V
t
SHORT
Transmitter Output Short to GND Time
Continuous
SHDN
T-OUT
R-OUT
L
High Z
High Z
H
Active
Active
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
CC
V
CC
Power Supply Current
SHDN = NO LOAD
0.3
1
mA
I
SHDN
SHUTDOWN Supply
Current
SHDN = GND
1
10
A
ESD
R-IN, T-OUT Electrostatic
Discharge Immunity
Human Body Model
15
kV
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
IL
Input Logic Threshold Low
T-IN, SHDN
0.8
V
V
IH
Input Logic Threshold High
T-IN, SHDN
V
CC
= 3.3V
2
V
T-IN, SHDN
V
CC
= 5.0V
2.4
V
HYS
Transmitter Input
Hysteresis
0.5
V
I
IL
Input Leakage Current
T-IN, SHDN
0.01
1
A
ST3384E
4/11
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, tested at 3.3V 10% C
1
= 0.047F, C
2
- C
4
= 0.33
F tested at 5V
10% -40C < T
A
< 85C unless otherwise noted. Typical values are referred to T
A
= 25C)
RECEIVER DC TARGET ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, tested at 3.3V 10% C
1
= 0.047F, C
2
- C
4
= 0.33
F tested at 5V
10% -40C < T
A
< 85C unless otherwise noted. Typical values are referred to T
A
= 25C)
TIMING TARGET ELECTRICAL CHARACTERISTICS
(C
1
- C
4
= 0.1
F, V
CC
= 3V to 5.5V, tested at 3.3V 10% C
1
= 0.047F, C
2
- C
4
= 0.33
F tested at 5V
10% -40C < T
A
< 85C unless otherwise noted. Typical values are referred to T
A
= 25C)
(Note 1) Transmitter Skew is measured at the transmitter zero cross points.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
TOUT
Output Voltage Swing
All Transmitter outputs loaded with 3 K
to GND
5
5.4
V
R
TOUT
Transmitter Output
Resistance
V
CC
= V+ = V- = 0V
Transmitter output =
2V
300
10M
I
TSC
Output Short Circuit Current
50
mA
I
TOL
Output Leakage Current
V
CC
= 0V or 3V to 5.5V
V
OUT
=
12V
Transmitters Disabled
25
A
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
OL
Output Leakage Current
R-OUT, Receiver Disabled
0.05
10
A
V
RIN
Input Voltage Operating
Range
-25
25
V
V
RIL
Input Threshold Low
T
A
= 25C
V
CC
= 3.3V
0.6
1.2
V
T
A
= 25C
V
CC
= 5.5V
0.8
1.5
V
RITH
Input Threshold High
T
A
= 25C
V
CC
= 3.3V
1.5
2.4
V
T
A
= 25C
V
CC
= 5.5V
1.8
2.4
V
RIH
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
= 2 mA
0.4
V
V
ROH
TTL/CMOS Output Voltage
High
I
OUT
= -1 mA
V
CC
-0.6 V
CC
-0.1
V
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
D
R
Maximum Data Rate
R
L
= 3 K
C
L2
= 1000pF
one transmitter switching
250
Kbps
t
PHLR
t
PLHR
Receiver Propagation Delay R
XIN
to R
XOUT
C
L
= 150pF
0.15
s
|t
PHLT
- t
PLHT
|
Transmitter Propagation
Delay Difference (Note 1)
(Note 1)
150
ns
|t
PHLR
- t
PLHR
|
Receiver Propagation Delay
Difference
100
ns
t
EX
Time to Exit Shutdown
V
OUT
3V, R
LOAD
at V+ = 3 K
20
s
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
8
8
30
30
V/
s
V/
s
ST3384E
5/11
TYPICAL OPERATING CIRCUIT
CAPACITANCE VALUE (
F)
C1
C2
C3
C4
Cbypass
0.1
0.1
0.1
0.1
0.1
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