STMICROELECTRONICS ST3243C

ST3243
3 TO 5.5V, 400KBPS, RS-232
TRANSCEIVER WITH AUTO-POWERDOWN
■
■
■
■
■
■
■
1µA SUPPLY CURRENT ACHIEVED WHEN
IN AUTO-POWERDOWN
250Kbps MINIMUM GUARANTEED DATA
RATE
GUARANTEED 6V/µs SLEW RATE RANGE
GUARANTEED MOUSE DRIVEABILITY
0.1µF EXTERNAL CAPACITORS
MEET EIA/TIA-232 SPECIFICATIONS DOWN
TO 3V
AVAILABLE IN SO-28, SSOP-28 AND
TSSOP28
DESCRIPTION
The ST3243 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 comunication standards providing high
data rate capability.
The receiver R2 is always active to implement a
wake-up feature for serial port.
The ST3243 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 1mA. Disconnecting
May 2002
SOP
SSOP
TSSOP
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.
1/11
ST3243
ORDERING CODES
Type
Temperature
Range
Package
Comments
ST3243CD
ST3243BD
ST3243CDR
ST3243BDR
ST3243CPR
ST3243BPR
ST3243CTR
ST3243BTR
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
SO-28 (Tube)
SO-28 (Tube)
SO-28 (Tape & Reel)
SO-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
TSSOP28 (Tape & Reel)
TSSOP28 (Tape & Reel)
27parts per tube / 12tube per box
27parts per tube / 12tube per box
1000 parts per reel
1000 parts per reel
1350 parts per reel
1350 parts per reel
2500 parts per reel
2500 parts per reel
PIN DESCRIPTION
PlN N°
SYMBOL
1
C2+
2
C2-
Negative Terminal of Inverting Charge Pump Capacitor
3
4
VR1IN
-5.5V Generated by the Charge Pump
First Receiver Input Voltage
5
R2IN
Second Receiver Input Voltage
6
R3IN
Third Receiver Input Voltage
7
R4IN
Fourth Receiver Input Voltage
8
R5IN
Fifth Receiver Input Voltage
9
T1OUT
First Transmitter Output Voltage
10
T2OUT
Second Transmitter Output Voltage
11
T3OUT
Third Transmitter Output Voltage
12
T3IN
Third Transmitter Input Voltage
13
T2IN
Second Transmitter Input Voltage
14
T1IN
First Transmitter Input Voltage
15
R5OUT
Fifth Receiver Output Voltage
16
R4OUT
Fourth Receiver Output Voltage
17
R3OUT
Third Receiver Output Voltage
18
R2OUT
Second Receiver Output Voltage
19
R1OUT
First Receiver Output Voltage
20
R2OUTB
Non-inverting Complementary Receiver Output, always active
for wake-up
Output of the valid signal detector. Indicates if a valid RS-232
level is present on receiver inputs logic "1"
Drive low to shut down transmitters and on-board power
supply. This over-rides all automatic circuitry and FORCEON
Drive high to override automatic circuitry keeping transmitters
on (FORCEOFF must be high)
Negative Terminal of Voltage- Charge Pump Capacitor
21
22
23
FORCEOFF
FORCEON
24
C1 -
25
GND
VCC
Ground
Supply Voltage
V+
C1+
5.5V Generated by the Charge Pump
Positive Terminal of Voltage- Charge Pump Capacitor
26
27
28
2/11
INVALID
NAME AND FUNCTION
Positive Terminal of Inverting Charge Pump Capacitor
ST3243
PIN CONFIGURATION
TRUTH TABLE
FORCE OFF
TOUT
ROUT
R2OUTB
0
1
HIGH Z
ACTIVE *
HIGH Z
ACTIVE *
ACTIVE *
ACTIVE *
* If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown , if no valid RS-232 levels are present on
all receiver input
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VCC
Supply Voltage
V+
Doubled Voltage Terminal
VInverted Voltage Terminal
V+ +|V-|
FORCEON, Input Voltage
FORCEOFF,
TIN
RIN
TOUT
Receiver Input Voltage Range
Transmitter Output Voltage Range
ROUT ROUTB Receiver Output Voltage Range
INVALID
tSHORT
Short Circuit Duration on TOUT (one at a time)
Tstg
Storage Temperature Range
Value
Unit
-0.3 to 6
V
(VCC -0.3) to 7
V
0.3 to -7
13
V
V
-0.3 to 6
V
± 25
V
± 13.2
V
-0.3 to (VCC + 0.3)
V
Continuous
-65 to 150
°C
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.
(*) The device doesn’t meet 1KV ESD HBM
3/11
ST3243
ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
Parameter
Test Conditions
IASHDN
Supply Current
Auto-powerdown
VCC = 3.3 or 5.0V
All R_IN open
ISHDN
Shutdown Supply Current
ISHDN
Supply Current
Auto-powerdown Disabled
VCC = 3.3 or 5.0V TA = 25°C
All R_IN open
FORCEOFF = GND
VCC = 3.3 or 5.0V TA = 25°C
FORCEON = FORCEOFF = VCCNo Load
Min.
TA = 25°C
FORCEOFF = VCC
Typ.
Max.
Unit
1
10
µA
1
10
µA
0.3
1
mA
Typ.
Max.
Unit
0.8
V
LOGIC INPUT ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
Parameter
Test Conditions
VTIL
Input Logic Threshold Low
T-IN, FORCEON, FORCEOFF
VTIH
Input Logic Threshold High
T-IN, FORCEON, FORCEOFF
VCC = 3.3V
VCC = 5V
Min.
2
2.4
V
V
IIL
Transmitter Input
Hysteresis
Input Leakage Current
T-IN, FORCEON, FORCEOFF
± 0.01
± 1.0
µA
IOL
Output Leakage Current
Receiver Disabled
± 0.05
± 10
µA
VOL
Output Voltage Low
IOUT = 1.6mA
VOH
Output Voltage High
IOUT = -1mA
VTHYS
0.5
V
0.4
VCC-0.6 VCC-0.1
V
V
AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
Parameter
VRITE
Receiver Input Threshold to
Transmitter Enabled
Receiver Input Threshold to
Transmitter Disabled
INVALID Output Voltage
LOW
INVALID Output Voltage
HIGH
Receiver Threshold to
Transmitter Enabled
Receiver Positive or
Negative Threshold to
INVALID HIGH
Receiver Positive or
Negative Threshold to
INVALID LOW
VRITD
VIOL
VIOH
tWU
tinvh
tinvL
4/11
Test Conditions
Positive Threshold
Negative Threshold
1µA Supply Current
Min.
Typ.
2.7
-0.3
VCC-0.6
Max.
Unit
2.7
0.3
V
V
V
0.4
V
V
IOUT = 1.6mA
250
µs
IOUT = -1mA
1
µs
30
µs
ST3243
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
Parameter
VTOUT
Output Voltage Swing
ROUT
Output Resistance
ISC
Output Short Circuit Current
VOT
Transmitter Output Voltage
Test Conditions
All Transmitter outputs are loaded with
3KΩ to GND
VCC = V+ = V- = 0V
VOUT = ± 2V
Min.
Typ.
±5
± 5.4
300
10M
± 35
T1IN = T2IN = GND,
T3IN = VCC
T3OUT loaded with 3KΩ to GND
Max.
Unit
V
Ω
± 60
±5
mA
V
T1OUT and T2OUT loaded with 2.5mA
each
RECEIVER ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
VRIN
VRIL
Parameter
Test Conditions
Receiver Input Voltage
Operating Range
RS-232 Input Threshold
Low
TA = 25°C
TA = 25°C
VCC = 3.3V
VCC = 5.0V
RS-232 Input Threshold
High
TA = 25°C
TA = 25°C
VCC = 3.3V
VCC = 5.0V
Min.
Typ.
-25
0.6
0.8
Max.
Unit
25
V
1.2
1.2
2.4
2.4
V
5
7
KΩ
Min.
Typ.
Max.
Unit
250
400
Kbps
0.15
µs
tT_SKEW Transmitter Skew
100
ns
tR_SKEW Receiver Skew
50
ns
1
µs
30
µs
VRIH
1.5
1.8
V
VRIHYS Input Hysteresis
RRIN
Input Resistance
0.5
TA = 25°C
3
V
TIMING CHARACTERISTICS
(C1 - C4 = 0.1µF, V CC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.
Typical values are referred to TA = 25°C)
Symbol
DR
tPHL
tPLH
tINVH
tINVL
SRT
Parameter
Test Conditions
Maximum Data Rate
RL = 3KΩ
CL= 1000pF
one trasmitter switching
Receiver Propagation Delay RIN to ROUT
CL = 150pF
Receiver Positive or
negative Threshold to
INVALID HIGH
Receiver Positive or
negative Threshold to
INVALID LOW
Transition Slew Rate
TA = 25°C RL = 3K to 7KΩ
VCC = 3.3V
measured from +3V to -3V or -3V to +3V
CL = 150pF to 1000pF
CL = 150pF to 2500pF
6
4
30
30
V/µs
V/µs
5/11
ST3243
APPLICATION CIRCUITS
CAPACITANCE VALUE (µF)
VCC
C1
C2
C3
C4
Cbypass
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
0.1
0.047
0.22
0.1
0.33
1.0
0.1
0.33
1.0
0.1
0.33
1.0
0.1
0.33
0.22
6/11
ST3243
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C)
Figure 1 : INVALID HIGH Threshold Time
Figure 4 : TReceiver Output Enable & Disable
Time
Figure 2 : INVALID LOW Threshold Time
Figure 5 : Output Current vs Output High Voltage
Figure 3 : Receiver Propagation Delay
Figure 6 : Output Current vs Output Low Voltage
7/11
ST3243
SO-28 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
2.65
MAX.
0.104
a1
0.1
0.3
0.004
0.012
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.012
C
0.5
0.020
c1
45° (typ.)
D
17.70
18.10
0.697
0.713
E
10.00
10.65
0.393
0.419
e
1.27
0.050
e3
16.51
0.650
F
7.40
7.60
0.291
0.300
L
0.50
1.27
0.020
0.050
S
8° (max.)
0016023
8/11
ST3243
SSOP28 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
2
A1
0.050
A2
1.65
b
MAX.
0.079
0.002
1.85
0.065
0.22
0.38
0.009
0.015
c
0.09
0.25
0.004
0.010
D
9.9
10.2
10.5
0.390
0.402
0.413
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
1.75
0.65 BSC
K
0°
L
0.55
0.75
0.069
0.073
0.0256 BSC
10°
0°
0.95
0.022
10°
0.030
0.037
9/11
ST3243
TSSOP28 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0089
D
9.6
9.7
9.8
0.378
0.382
0.386
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
e
1
0.65 BSC
K
0°
L
0.45
0.60
0.0256 BSC
8°
0°
0.75
0.018
8°
0.024
0.030
0128292B
10/11
ST3243
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consequences of use of such information nor for any infringement of patents or other rights of third parties which may result 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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11/11