1/11October 2003
■300µA SUPPLY CURRENT
■250Kbps MINIMUM GUARENTEED DATA
RATE
■6V/ms MINIMUM GUARANTEED SLEW
RATE
■MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
■AVAILABLE IN SO-18 AND SSOP20
DESCRIPTION
The ST3384 is a 3V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements and high data-rate
capabilities. ST3384 has a proprietary low dropout
transmitter output stage providing true RS-232
performance from 3 to 3.6V power supplies. The
device requires only four small 0.1mF standard
external capacitors for operating from 3V supply.
The ST3384 has two receivers and two drivers.
The ST3384 features a 1mA shutdown mode that
reduces power consumption and extends battery
life in portable systems. Its receivers can remain
active in shutdown mode, allowing external
devices such as modems to be monitored using
only 1mA supply current.
The device is guaranteed to run at data rates of
250Kbps while maintaining RS-232 output levels.
Typical applications are Notebook, Sub-notebook
and Palmtop Computers, Battery Powered
Equipment, Hand-Held Equipment, Peripherals
and Printers.
ORDERING CODES
Type Temperature
Range Package Comments
ST3384CD 0 to 70 °C SO-18 (Tube) 50 parts per tube / 20 tube per box
ST3384BD -40 to 85 °C SO-18 (Tube) 50 parts per tube / 20 tube per box
ST3384CDR 0 to 70 °C SO-18 (Tape & Reel) 1000 parts per reel
ST3384BDR -40 to 85 °C SO-18 (Tape & Reel) 1000 parts per reel
ST3384CPR 0 to 70 °C SSOP20 (Tape & Reel) 1350 parts per reel
ST3384BPR -40 to 85 °C SSOP20 (Tape & Reel) 1350 parts per reel
ST3384
3 TO 3.6V, LOW POWER, UP TO 250KBPS,
RS-232 DRIVERS AND RECEIVERS
SO-18 SSOP20
ST3384
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
22
C
1
+
Positive Terminal for the first Charge Pump
Capacitor
3 3 V+ 5.5V Generated By The Charge Pump
44
C
1
-
Negative Terminal for the first Charge Pump
Capacitor
55
C
2
+
Positive Terminal for the second Charge Pump
Capacitor
66
C
2
-
Negative Terminal for the second Charge Pump
Capacitor
7 7 V- -5.5V Generated By The Charge Pump
88
T2OUT Second Transmitter Output Voltage
99
R2IN Second Receiver Input Voltage
10 12 R2OUT Second Receiver Output Voltage
11 13 T2IN Second Transmitter Input Voltage
12 14 T1IN First Transmitter Input Voltage
13 15 R1OUT First Receiver Output Voltage
14 16 R1IN First Receiver Input Voltage
15 17 T1OUT First Transmitter Output Voltage
16 18 GND Ground
17 19 VCC 3V to 5.5V Supply Voltage. Connect a 0.1µF
capacitor to GND
18 20 SHDN Active Low Shutdown Control Input. Drive Low To
Shut-down Transmitters, receiver and Charge
Pump
SO-18 SSOP20
ST3384
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
(C1-C
4=0.1µF, VCC = 3V to 5.5V, tested at 3.3V ±10% C1= 0.047µF, C2-C
4= 0.33µFtestedat5V
±10% -40°C < TA< 85°C unless otherwise noted. Typical values are referred to TA= 25°C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS
(C1-C
4=0.1µF, VCC = 3V to 5.5V, tested at 3.3V ±10% C1= 0.047µF, C2-C
4= 0.33µFtestedat5V
±10% -40°C < TA< 85°C unless otherwise noted. Typical values are referred to TA= 25°C)
Symbol Parameter Value Unit
VCC Supply Voltage (VCC to GND) -0.3 to 6 V
V+ Doubled Voltage Terminal (V+ to GND) (Note 1) (VCC -0.3)to7 V
V- Inverted Voltage Terminal (V- to GND) (Note 1) 0.3 to -7 V
V+ +|V-| (Note 1) 13 V
TIN Transmitter Input Voltage -0.3 to 6 V
SHDN Shutdown Input Voltage (SHDN to GND) -0.3 to 6 V
RIN Receiver Input Voltage (RIN to GND) ± 25 V
TOUT Transmitter Output Voltage (TOUT to GND) ± 13.2 V
ROUT Receiver Output Voltage -0.3 to (VCC + 0.3) V
tSHORT 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
ICC VCC Power Supply Current SHDN = NO LOAD 0.3 1 mA
ISHDN SHUTDOWN Supply
Current SHDN =GND 1 10 µA
ESD R-IN, T-OUT Electrostatic
Discharge Immunity Human Body Model ±15 kV
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VIL Input Logic Threshold Low T-IN, SHDN 0.8 V
VIH Input Logic Threshold High T-IN, SHDN VCC = 3.3V 2 V
T-IN, SHDN VCC = 5.0V 2.4
VHYS Transmitter Input
Hysteresis 0.5 V
IIL Input Leakage Current T-IN, SHDN ± 0.01 ± 1µA
ST3384
4/11
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C1-C
4=0.1µF, VCC = 3V to 5.5V, tested at 3.3V ±10% C1= 0.047µF, C2-C
4= 0.33µFtestedat5V
±10% -40°C < TA< 85°C unless otherwise noted. Typical values are referred to TA= 25°C)
RECEIVER DC TARGET ELECTRICAL CHARACTERISTICS
(C1-C
4=0.1µF, VCC = 3V to 5.5V, tested at 3.3V ±10% C1= 0.047µF, C2-C
4= 0.33µFtestedat5V
±10% -40°C < TA< 85°C unless otherwise noted. Typical values are referred to TA= 25°C)
TIMING TARGET ELECTRICAL CHARACTERISTICS
(C1-C
4=0.1µF, VCC = 3V to 5.5V, tested at 3.3V ±10% C1= 0.047µF, C2-C
4= 0.33µFtestedat5V
±10% -40°C < TA< 85°C unless otherwise noted. Typical values are referred to TA= 25°C)
(Note 1) Transmitter Skew is measured at the transmitter zero cross points.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VTOUT Output Voltage Swing All Transmitter outputs loaded with 3 KΩ
to GND ± 5± 5.4 V
RTOUT Transmitter Output
Resistance VCC =V+=V-=0V
Transmitter output = ±2V 300 10M Ω
ITSC Output Short Circuit Current ± 50 mA
ITOL Output Leakage Current VCC = 0V or 3V to 5.5V VOUT =±12V
Transmitters Disabled ± 25 µA
Symbol Parameter Test Conditions Min. Typ. Max. Unit
IOL Output Leakage Current R-OUT, Receiver Disabled ± 0.05 ± 10 µA
VRIN Input Voltage Operating
Range -25 ± 25 V
VRIL Input Threshold Low TA= 25°C VCC = 3.3V 0.6 1.2 V
TA= 25°C VCC = 5.5V 0.8 1.5
VRITH Input Threshold High TA= 25°C VCC = 3.3V 1.5 2.4 V
TA= 25°C VCC = 5.5V 1.8 2.4
VRIH Input Hysteresis 0.5 V
RRIN Input Resistance TA= 25°C 3 5 7 KΩ
VROL TTL/CMOS Output Voltage
Low IOUT = 2 mA 0.4 V
VROH TTL/CMOS Output Voltage
High IOUT =-1mA V
CC-0.6 VCC-0.1 V
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DRMaximum Data Rate RL=3KΩC
L2= 1000pF
one transmitter switching 250 Kbps
tPHLR
tPLHR
Receiver Propagation Delay RXIN to RXOUT CL= 150pF 0.15 µs
|tPHLT
-t
PLHT|Transmitter Propagation
Delay Difference (Note 1) (Note 1) 150 ns
|tPHLR
-t
PLHR|ReceiverPropagationDelay
Difference 100 ns
tEX Time to Exit Shutdown VOUT ≥ 3V, RLOAD at V+ = 3 KΩ20 µs
SRT Transition Slew Rate TA= 25°C RL=3KΩto 7KΩ VCC = 3.3V
Measured from +3V to -3V or -3V to +3V
CL= 150pF to 1000pF
CL= 150pF to 2500pF 6
48
830
30 V/µs
V/µs
ST3384
5/11
TYPICAL OPERATING CIRCUIT
CAPACITANCE VALUE (µF)
C1 C2 C3 C4 Cbypass
0.1 0.1 0.1 0.1 0.1
ST3384
6/11
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj= 25°C)
Figure 1 : Loopback Test Result at 120 kbps
Figure 2 : Loopback Test Result at 250 kbps
Figure 3 : Transmitter Outputs Exiting Shutdown
or Powering Up
V
CC =
3
.
3V
,
C
I-
C
4=
0
.
1
µ
F
V
CC =
3
.
3V
,
C
I-
C
4=
0
.
1
µ
F
V
CC =5
V
,
C
I-
C
4
=
0
.
1
µ
F
ST3384
7/11
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 2.35 2.65 0.092 0.104
A1 0.1 0.3 0.004 0.012
A2 2.55 0.100
B 0.33 0.51 0.013 0.020
C 0.23 0.32 0.009 0.012
D 11.35 11.75 0.447 0.462
E 7.4 7.6 0.291 0.299
e 1.27 0.050
H 10.00 10.65 0.393 0.419
h 0.25 0.75 0.010 0.029
k8 ˚ (max.)
L 0.4 1.27 0.016 0.050
SO-18 MECHANICAL DATA
0070768
Be
A2
A
19
1018
D
LH
A1 C
E
K
h x 45û
SO18
Seating Plane
0.10mm
.004
ST3384
8/11
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 2 0.079
A1 0.05 0.002
A2 1.65 1.75 1.85 0.065 0.069 0.073
b 0.22 0.38 0.009 0.015
c 0.09 0.25 0.004 0.010
D 6.9 7.2 7.5 0.272 0.283 0.295
E 7.4 7.8 8.2 0.291 0.307 0.323
E1 5 5.3 5.6 0.197 0.209 0.220
e 0.65 BSC 0.0256 BSC
K0˚4˚8˚0˚4˚8˚
L 0.55 0.75 0.95 0.022 0.030 0.037
SSOP20 MECHANICAL DATA
cE
b
A2
A
E1
D
1
PIN 1 IDENTIFICATION
A1 L
K
e
0061436C
ST3384
9/11
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 10.8 11.0 0.425 0.433
Bo 11.9 12.1 0.468 0.476
Ko 2.9 3.1 0.114 0.122
Po 3.9 4.1 0.153 0.161
P 11.9 12.1 0.468 0.476
Tape & Reel SO-18 MECHANICAL DATA
ST3384
10/11
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 8.4 8.6 0.331 0.339
Bo 7.7 7.9 0.303 0.311
Ko 2.9 3.1 0.114 0.122
Po 3.9 4.1 0.153 0.161
P 11.9 12.1 0.468 0.476
Tape & Reel SSOP20 MECHANICAL DATA
ST3384
11/11
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
conseq uences of u se of such inform ation nor fo r an y infr ingeme nt of pa tents or oth er righ ts of third part ies whic h may resul t from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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