UNISONIC TECHNOLOGIES CO., LTD
UT3243
+3.0V TO +5.5V POWER
SUPPLY, 235KBPS,
MULTICHANNAEL RS-232 LINE
DRIVERS/RECEIVERS
DESCRIPTION
CMOS IC
The UTC
UT3243
consists of 3 drivers and 5 receivers. It meets
ElA/TIA-232 and V.28/V.24 specifications, it intended for notebook
computer applications. A high-efficiency, dual charge-pumps power
supply and a low-dropout transmitter combine to deliver true RS-232
performance from a single +3.0V ~ +5.5V power supply. A
guaranteed data rate of 120kbps provides compatibility with popular
software for communicating with PCs.
The UTC
UT3243
achieves 1µA supply current in shutdown condition. When the
UT3243
doesn’t detect a valid
signal level on its receiver inputs, the on-board power supply and drivers will shutdown, and when a valid level is
applied to any RS-232 receiver input, then the system turns on again. Therefore, the system saves power without
changes to the existing BIOS or operating system.
The UTC
UT3243
requires only 0.1µF capacitors in 3.3V operation, and can operate from input voltages ranging
from +3.0V ~ +5.5V. It is ideal for 3.3V-only systems, 5.0V-only systems, or mixed 3.3V and 5.0V systems that
require true RS-232 performance.
The UTC
UT3243
includes one complementary always-active receiver that can monitor an external device (such
as a modem) in shutdown, without forward biasing the protection diodes in a UART that may have V
CC
completely
removed.
FEATURES
* External Capacitors (4*0.1µF)
* Accepts 5.0V Logic Input With 3.3V Supply
* Always-Active Non-inverting Receiver Output (R
2OUTB
)
* Serial-Mouse Drivability
* ESD(HBM) Protected ±8KV(MIN.)
* Operates With 3.0V ~ 5.5V Power Supply
* Three Drivers and Five Receivers
* Operates Up To 235 kbps
* Designed to Transmit at a Data Rate of 235 kbps
* Low Standby Current (1uA Typical)
ORDERING INFORMATION
Ordering Number
Lead Free
UT3243L-P28-T
UT3243L-P28-R
UT3243L-R28-T
UT3243L-R28-R
UT3243L-P28-R
Halogen Free
UT3243G-P28-T
UT3243G-P28-R
UT3243G-R28-T
UT3243G-R28-R
Package
TSSOP-28
TSSOP-28
SSOP-28
SSOP-28
Packing
Tube
Tape Reel
Tube
Tape Reel
(1)Packing Type
(2)Package Type
(3)Lead Free
(1) R: Tape Reel
(2) P28: TSSOP-28, R28: SSOP-28
(3) L: Lead Free, G: Halogen Free
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QW-R502-573.F
UT3243
PIN CONFIGURATION
C2+
C2-
V-
R
1IN
R
2IN
R
3IN
R
4IN
R
5IN
T
1OUT
1
2
3
4
5
6
7
8
9
UTC
UT3243
28 C1+
27 V+
26 V
CC
25 GND
24 C1-
23 FORCEON
22 FORCEOFF
21 INVALID
20 R
2OUTB
19 R
1OUT
18 R
2OUT
17 R
3OUT
16 R
4OUT
15 R
5OUT
CMOS IC
T
2OUT
10
T
3OUT
11
T
3IN
12
T
2IN
13
T
1IN
14
PIN DESCRIPTION
PIN NAME
C2+
C2-
V-
R
XIN
T
XOUT
T
XIN
R
XOUT
R
2OUTB
INVALID
PIN NO.
1
2
3
4~8
9~11
12~14
15~19
20
21
22
23
24
25
26
27
28
FORCEOFF
FORCEON
C1-
GND
V
CC
V+
C1+
DESCRIPTION
Positive terminal of inverting charge-pump capacitor
Negative terminal of inverting charge-pump capacitor
-5.5V generated by the charge pump
RS-232 Receiver Inputs
RS-232 Transmitter Outputs
TTL/CMOS Transmitter Inputs
TTL/CMOS Receiver Outputs
Noninverting Receiver Output—active in shutdown
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 (Table 1).
Drive high to override automatic circuitry keeping transmitters on (
FORCEOFF
must
be high) (Table 1).
Negative terminal of the voltage doubler charge-pump capacitor
Ground
+3.0V ~ +5.5V Supply Voltage
+5.5V generated by the charge pump
Positive terminal of the voltage doubler charge-pump capacitor
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QW-R502-573.F
UT3243
BLOCK DIAGRAM
CMOS IC
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QW-R502-573.F
UT3243
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
V
CC
V+
V-
V
PUMP
CMOS IC
RATINGS
UNIT
V
CC
-0.3~+6
V
V+ (Note 2)
-0.3~+7
V
V- (Note 2)
+0.3~-7
V
V+ +|V-| (Note 2)
+13
V
T_IN,
FORCEOFF
, FORCEON
-0.3~+6
V
Input Voltages
V
IN
R_IN
±25
V
T_OUT
±13.2
V
Output Voltages
V
OUT
R_OUT,
INVALID
-0.3~(V
CC
+0.3)
V
Short-Circuit Duration
T_OUT
SC
Continuous
696
mW
Power Dissipation(T
A
= 70°C)
P
D
Derating above T
A
=70°C
8.70
mW/°C
Operating Temperature
T
OPR
-40~+85
°C
Storage Temperature
T
STG
-65~+150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
ELECTRICAL CHARACTERISTICS
MAX UNIT
10
10
1
0.8
µA
µA
mA
V
V
±1.0
±10
0.4
µA
µA
V
V
V
V
V
V
µs
(V
CC
= +3.0V~+5.5V, C1~C4=0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
DC CHARACTERISTICS
All R_IN open,
FORCEOFF
=V
CC
,
1.0
Supply Current, Shutdown
I
SHDN
V
CC
= 3.3V FORCEON = GND
FORCEOFF
= GND
or 5.0V,
1.0
T
A
= 25°C FORCEON =
FORCEOFF
= V
CC
,
Supply Current,
I
CC
0.3
Shutdown Disabled
no load
LOGIC INPUTS AND RECEIVER OUTPUTS
T_IN, FORCEON,
FORCEOFF
Low
V
LGL
Input Logic Threshold
T_IN, EN, FORCEON,
2.0
V
CC
= 3.3V
High
V
LGH
FORCEOFF
V
CC
= 5.0V
2.4
T_IN, EN, FORCEON,
FORCEOFF
Input Leakage Current
I
IN(LK)
±0.01
Output Leakage Current
I
ROUT(LK)
Receivers disabled
±0.05
Low
V
ROUTL
I
OUT
= 1.6mA
Output Voltage
High
V
ROUTH
I
OUT
= -1.0mA
V
CC
- 0.6 V
CC
- 0.1
SHUTDOWN
(FORCEON = GND,
FORCEOFF
= V
CC
)
Receiver Input
Thresholds to
Transmitters
INVALID
Enabled
Disabled
Low
High
V
R(EN)
V
R(DIS)
V
INVL
V
INVH
t
WU
Fig.1
Output
Voltage
Receiver Threshold to
Transmitters Enabled
Positive threshold
Negative threshold
1µA supply current, Fig.1
I
OUT
= 1.6mA
I
OUT
= -1.0mA
2.7
-2.7
-0.3
V
CC
- 0.6
0.3
0.4
250
Fig.2
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QW-R502-573.F
UT3243
ELECTRICAL CHARACTERISTICS(Cont.)
(V
CC
= +3.0V~+5.5V, C1~C4=0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, Unless Otherwise Specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Receiver Positive or
High
t
INVH
Negative Threshold to
Fig.2
Low
t
INVL
INVALID
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
MOUSE DRIVABILITY
Transmitter Output Voltage
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Time
Transmitter Skew
Receiver Skew
Transition-Region Slew Rate
Enable
Disable
DR
t
PHL
t
PLH
t
R(EN)
t
R(DIS)
t
TS
t
RS
SR
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
Receiver input to receiver output,
C
L
= 150pF
Normal operation
|t
PHL
– t
PLH
|
|t
PHL
– t
PLH
|
V
CC
=3.3V, T
A
=25°C,
C
L
= 200pF~2500pF
R
L
= 3kΩ ~ 7kΩ,
measured from +3V
C
L
= 200pF~1000pF
~ -3V or -3V ~ +3V
120
V
RR
V
RINL
V
RINH
T
A
= 25°C
T
A
= 25°C
V
CC
=3.3V
V
CC
=5.0V
V
CC
=3.3V
V
CC
=5.0V
-25
0.6
0.8
CMOS IC
TYP
1
30
MAX UNIT
µs
µs
25
V
V
2.4
2.4
7
V
V
kΩ
V
Ω
±60
±25
mA
µA
V
RINHYS
V
RINRES
T
A
= 25°C
V
TOUTSW
V
TOUTRES
I
TSC
I
TOUT(LK)
V
OUT
=±12V, Transmitters disabled
T
1IN
= T
2IN
= GND, T
3IN
= V
CC
,
T
3OUT
loaded with 3kΩ to GND,
T
1OUT
and T
2OUT
loaded with 2.5mA each
All transmitter outputs loaded with
3kΩ to ground
V
CC
= V+ = V- = 0V,
Transmitter output = ±2V
3
±4.8
300
1.2
1.5
1.5
1.8
0.3
5
±5.4
10M
±35
V
TOUT
±4.8
V
235
0.3
0.3
200
200
200
100
kbps
µs
ns
ns
ns
ns
V/µs
1000
500
30
30
4
6
8.0
Notes: 1. Typical values are at T
A
= 25°C.
2. C1~C4 = 0.1µF, measured at 3.3V ±10%. C1 = 0.047µF, C2~C4 = 0.33µF, measured at 5.0V ±10%.
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QW-R502-573.F
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