1/18
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, SSOP-28, TSSOP28
AND FLIP-CHIP28 PACKAGES
DESCRIPTION
The ST3243E 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 ST3243E 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.
The Auto-powerdown feature functions when
FORCEON is low and FORCEOFF is high. During
this mode of operation, if the device does not
sense a valid RS-232 signal, the driver outputs are
disabled. If FORCEOFF is set low, both drivers
and receivers (expert R2B) are shut off, and
supply current is reduced to 1
A. Disconnecting
the serial port or turning off the peripheral drives
causes the auto-powerdown condition to occur.
Auto-powerdown
can
be
disabled
when
FORCEON and FORCEOFF are high, and should
be done when driving a serial mouse. With
Auto-powerdown enabled, the device is activated
automatically when a valid signal is applied to any
receiver input.
Typical application are in notebook, subnotebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.
ST3243E
15KV ESD PROTECTED 3 TO 5.5V, 400KBPS,
RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
SSOP
SOP
TSSOP
Flip-Chip28
ST3243E
2/18
ORDERING CODES
PIN DESCRIPTION
Type
Temperature
Range
Package
Comments
ST3243ECD
0 to 70C
SO-28 (Tube)
27parts per tube / 12tube per box
ST3243EBD
-40 to 85C
SO-28 (Tube)
27parts per tube / 12tube per box
ST3243ECDR
0 to 70C
SO-28 (Tape & Reel)
1000 parts per reel
ST3243EBDR
-40 to 85C
SO-28 (Tape & Reel)
1000 parts per reel
ST3243ECPR
0 to 70C
SSOP-28 (Tape & Reel)
1350 parts per reel
ST3243EBPR
-40 to 85C
SSOP-28 (Tape & Reel)
1350 parts per reel
ST3243ECTR
0 to 70C
TSSOP28 (Tape & Reel)
2500 parts per reel
ST3243EBTR
-40 to 85C
TSSOP28 (Tape & Reel)
2500 parts per reel
ST3243ECJ
0 to 70C
FLIP-CHIP28
coming soon
ST3243EBJ
-40 to 85C
FLIP-CHIP28
coming soon
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
INVALID
Output of the valid signal detector. Indicates if a valid RS-232
level is present on receiver inputs logic "1"
22
FORCEOFF
Drive low to shut down transmitters and on-board power
supply. This over-rides all automatic circuitry and FORCEON
23
FORCEON
Drive high to override automatic circuitry keeping transmitters
on (FORCEOFF must be high)
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
ST3243E
3/18
PIN DESCRIPTION
PlN N
SYMBOL
NAME AND FUNCTION
A1
R2
IN
Second Receiver Input Voltage
A2
R3
IN
Third Receiver Input Voltage
A3
R4
IN
Fourth Receiver Input Voltage
A4
R5
IN
Fifth Receiver Input Voltage
A5
T1
OUT
First Transmitter Output Voltage
A6
T2
OUT
Second Transmitter Output Voltage
B1
V-
-5.5V Generated by the Charge Pump
B2
R1
IN
First Receiver Input Voltage
B3
T3
OUT
Third Transmitter Output Voltage
B4
T3
IN
Third Transmitter Input Voltage
B5
T1
IN
First Transmitter Input Voltage
B6
T2
IN
Second Transmitter Input Voltage
C1
C
2
+
Positive Terminal of Inverting Charge Pump Capacitor
C2
C
2
-
Negative Terminal of Inverting Charge Pump Capacitor
C5
R4
OUT
Fourth Receiver Output Voltage
C6
R5
OUT
Fifth Receiver Output Voltage
D1
C
1
+
Positive Terminal of Voltage- Charge Pump Capacitor
D2
V+
5.5V Generated by the Charge Pump
D3
V
CC
Supply Voltage
D4
FORCEON
Drive high to override automatic circuitry keeping transmitters
on (FORCEOFF must be high)
D5
R1
OUT
First Receiver Output Voltage
D6
R3
OUT
Third Receiver Output Voltage
E1
GND
Ground
E2
C
1
-
Negative Terminal of Voltage- Charge Pump Capacitor
E3
FORCEOFF
Drive low to shut down transmitters and on-board power
supply. This over-rides all automatic circuitry and FORCEON
E4
INVALID
Output of the valid signal detector. Indicates if a valid RS-232
level is present on receiver inputs logic "1"
E5
R2
OUTB
Non-inverting Complementary Receiver Output, always active
for wake-up
E6
R2
OUT
Second Receiver Output Voltage
ST3243E
4/18
PIN CONFIGURATION
INVALID TRUTH TABLE
OUTPUT CONTROL TRUTH TABLE
RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT
INVALID OUTPUT
YES
H
NO
L
FORCE
ON
FORCE
OFF
VALID RECEIVER
LEVEL
OPERATION STATUS
T
OUT
R
OUT
R
2OUTB
X
0
X
Shutdown (Force OFF)
HIGH Z
HIGH Z
ACTIVE
1
1
X
Normal Operating (Force
ON)
ACTIVE
ACTIVE
ACTIVE
0
1
YES
Normal Operating
(Auto-powerdown)
ACTIVE
ACTIVE
ACTIVE
0
1
NO
Shutdown
(Auto-powerdown)
HIGH Z
ACTIVE
ACTIVE
SOP, SSOP, TSSOP
(top view)
FLIP-CHIP 6x5
(bottom view, bumps side)
ST3243E
5/18
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.
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)
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
FORCEON,
FORCEOFF,
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
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
ASHDN
Supply Current
Auto-powerdown
FORCEOFF = GNDFORCEON = V
CC
All R_IN open or grounded
1
10
A
I
SUPPLY
Supply Current
FORCEON = FORCEOFF = V
CC
0.3
1
mA
I
SHDN
Shutdown Supply Current
FORCEOFF = GND
1
10
A
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
TIL
Input Logic Threshold Low
T-IN, FORCEON, FORCEOFF
0.8
V
V
TIH
Input Logic Threshold High
T-IN, FORCEON, FORCEOFF
V
CC
= 3.3V
V
CC
= 5V
2
2.4
V
V
V
THYS
Transmitter Input
Hysteresis
0.5
V
I
IL
Input Leakage Current
T-IN, FORCEON, FORCEOFF
0.01
1.0
A
I
OL
Output Leakage Current
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
PDF 
ZIP