Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UT3223
Preliminary
CMOS IC
+3.0V TO +5.5V POWER SUPPLY,
250KBPS, MULTICHANNAEL
RS-232 LINE
DRIVERS/RECEIVERS

DESCRIPTION
The UTC UT3223 consists of 2 drivers and 2 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
250kbps provides compatibility with popular software for communicating
with PCs.
The UTC UT3223 achieves 1µA supply current in shutdown condition.
When the UT3223 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 UT3223 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.

FEATURES
* Operates With 3.0V~5.5V Power Supply
* Two Drivers and Two Receivers
* Operates Up To 250 kbps
* Designed to Transmit at a Data Rate of 250 kbps
* Low Standby Current (1µA Typical)
* External Capacitors (4*0.1µF)
* Accepts 5.0V Logic Input With 3.3V Supply
* Serial-Mouse Drivability
* Exceeds ±8KV ESD Protection(HBM) for RS-232 I/O Pins

ORDERING INFORMATION
Ordering Number
UT3223G-P20-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
TSSOP-20
Packing
Tape Reel
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UT3223
Preliminary
■
MARKING

PIN CONFIGURATION

CMOS IC
EN
1
20
FORCEOFF
C1+
2
19
VCC
V+
3
18
GND
17
T1OUT
16
R1IN
15
R1OUT
C1-
4
C2+
5
C2V-
6
7
14
FORCEON
T2OUT
8
13
T1IN
R2IN
9
12
T2IN
R2OUT
10
11
INVALID
UTC
UT3223
PIN DESCRIPTION
PIN NO.
PIN NAME
1
EN
2
3
4
5
6
7
8
9
10
C1+
V+
C1C2+
C2VT2OUT
R2IN
R2OUT
11
INVALID
12
13
T2IN
T1IN
14
FORCEON
15
16
17
18
19
R1OUT
R1IN
T1OUT
GND
VCC
20
FORCEOFF
DESCRIPTION
Receiver Enable Control. Drive low for normal operation. Drive high to force the
receiver outputs (R_OUT) into a high-impedance state.
Positive terminal of the voltage doubler charge-pump capacitor.
+5.5V generated by the charge pump.
Negative terminal of the voltage doubler charge-pump capacitor.
Positive terminal of inverting charge-pump capacitor.
Negative terminal of inverting charge-pump capacitor.
-5.5V generated by the charge pump.
RS-232 Transmitter 2 Output.
RS-232 Receiver 2 Input.
TTL/CMOS Receiver 2 Output.
Output of the valid signal detector. Indicates if a valid RS-232 level is present on
receiver inputs logic “1”.
TTL/CMOS Transmitter 2 Input.
TTL/CMOS Transmitter 1 Input.
Drive high to override automatic circuitry keeping transmitters on ( FORCEOFF must
be high) (Table 2).
TTL/CMOS Receiver 1 Output.
RS-232 Receiver 1 Input.
RS-232 Transmitter 1 Output.
Ground.
+3.0V ~ +5.5V Supply Voltage.
Drive low to shut down transmitters and on-board power supply. This over-rides all
automatic circuitry and FORCEON (Table 2).
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UT3223

Preliminary
CMOS IC
BLOCK DIAGRAM
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UT3223

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VCC
V+
VVPUMP
VCC
V+ (Note 2)
V- (Note 2)
V+ +|V-| (Note 2)
T_IN, FORCEOFF ,
FORCEON, EN
R_IN
T_OUT
Input Voltages
Output Voltages
R_OUT, INVALID
T_OUT
VIN
VOUT
RATINGS
-0.3~+6.0
-0.3~+7.0
+0.3~-7.0
+13.0
UNIT
V
V
V
V
-0.3~+6.0
V
±25
±13.2
V
V
-0.3~(VCC+0.3)
V
Short-Circuit Duration
SC
Continuous
Power Dissipation(TA=25°C)
PD
870
mW
Operating Temperature
TOPR
-40~+85
°C
Storage Temperature
TSTG
-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 7.0V, but their absolute difference cannot exceed 13.0V.

ELECTRICAL CHARACTERISTICS
(VCC=+3.0V~+5.5V, C1~C4=0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
DC CHARACTERISTICS
All R_IN open,
Supply Current, Shutdown
ISHDN
Supply Current,
Shutdown Disabled
FORCEOFF =VCC,
FORCEON=GND
VCC=3.3V
or 5.0V,
FORCEOFF =GND,
TA= 25°C All R_IN=GND
FORCEON= FORCEOFF =VCC,
no load
ICC
TYP
MAX UNIT
1.0
10
µA
1.0
10
µA
0.3
1.0
mA
0.8
V
LOGIC INPUTS
Low
Input Logic Threshold
High
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Low
Output Voltage
High
VLGL
EN ,T_IN, FORCEON, FORCEOFF
VLGH
EN ,T_IN, EN, FORCEON, VCC = 3.3V
VCC = 5.0V
FORCEOFF
IIN(LK)
T_IN, EN , FORCEON, FORCEOFF
±0.01 ±1.0
µA
Receivers disabled
IOUT = 1.6mA
IOUT = -1.0mA
±0.05
±10
0.4
µA
V
V
2.7
V
0.3
0.4
V
V
V
IROUT(LK)
VROUTL
VROUTH
2.0
V
2.4
VCC - 0.6 VCC - 0.1
AUTOSHUTDOWN (FORCEON=GND, FORCEOFF =VCC)
Receiver Input
Thresholds to
Transmitters
INVALID
Output
Voltage
Receiver Threshold to
Transmitters Enabled
Enabled
VR(EN)
Disabled
Low
High
VR(DIS)
VINVL
VINVH
tWU
Positive threshold
Negative threshold
1µA supply current, Fig.1
IOUT=1.6mA
IOUT=-1.0mA
Fig.1
Fig.2
UNISONIC TECHNOLOGIES CO., LTD
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-2.7
-0.3
VCC - 0.6
100
µs
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
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
(VCC=+3.0V~+5.5V, C1~C4=0.1µF (Note 2), TA = TMIN to TMAX, Unless Otherwise Specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Receiver Positive or
High
tINVH
Negative Threshold to
Fig.2
Low
tINVL
INVALID
RECEIVER INPUTS
Input Voltage Range
VRR
Input Threshold Low
VRINL
TA=25°C
Input Threshold High
VRINH
TA=25°C
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
VRINHYS
VRINRES TA=25°C
Output Voltage Swing
VTOUTSW
Output Resistance
VTOUTRES
Output Short-Circuit Current
Output Leakage Current
VCC=3.3V
VCC=5.0V
VCC=3.3V
VCC=5.0V
-25
0.6
0.8
3
All transmitter outputs loaded with 3kΩ to
±5.0
ground
VCC= V+=V-=0V,
300
Transmitter output=±2V
ITSC
ITOUT(LK)
TYP
MAX UNIT
1.0
µs
30
µs
25
1.2
1.5
1.5
1.8
0.5
5
V
V
2.4
2.4
7
V
V
kΩ
±5.4
V
10M
Ω
±35
VCC=3.0V~5.0V, VOUT=±12V,
Transmitters disabled
±60
mA
±25
µA
TIMING CHARACTERISTICS
Maximum Data Rate
DR
Receiver Propagation Delay
Receiver Output Time
Enable
Disable
Transmitter Skew
Receiver Skew
Transition-Region Slew Rate
tPHL
tPLH
tR(EN)
tR(DIS)
tTS
tRS
SR
RL=3kΩ, CL=1000pF, one transmitter
250
switching
Receiver input to receiver output,
CL=150pF
Normal operation
|tPHL – tPLH|
|tPHL – tPLH|
VCC=3.3V, TA=25°C,
RL=3kΩ~7kΩ,
CL=220pF~1000pF
measured from +3V
~ -3V or -3V~+3V
kbps
0.15
0.15
200
200
100
50
µs
ns
ns
ns
ns
5
35
V/µs
Notes: 1. Typical values are at TA=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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UT3223

Preliminary
CMOS IC
DETAILED DESCRIPTION
Charge-Pump Voltage Converter
The UTC UT3223 consists of a regulated dual charge pumps that provide output voltages of +5.5V and -5.5V,
regardless of the input voltage (VCC) changing from +3.0V to +5.5V.
The charge pumps operate in a discontinuous mode: if the output voltages are less than 5.5V, the charge pumps
are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled.
Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and
V- supplies, refer to application circuit.
RS-232 Transmitters
UTC UT3223’s transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232
levels. They guarantee a 250kbps data rate with worst-case loads of 3kΩ in parallel with 1000pF, providing
compatibility with PC-to-PC communication software.
Transmitters can be paralleled to drive multiple receivers or mouse. When FORCEOFF is driven to ground, or
shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs
are forced into a high-impedance state.
RS-232 Receivers
The UTC UT3223’s receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one
inverting three-state output. In shutdown or in autoshutdown, the UT3223’s receivers are active. Drive EN high to
place the receiver in a high-impedance state.
Table 1. EN Control Truth Table
R_OUT
Active
High-Z
EN
0
1
Shutdown Function
A 1µA supply current is achieved with shutdown feature, which operates when FORCEON is low and
FORCEOFF is high. When the UTC UT3223 senses no valid signal levels on all receiver inputs for 30µs, the
on-board power supply and drivers are shut off, reducing supply current to 1µA. This occurs if the RS-232 cable is
disconnected or the connected peripheral transmitters are turned off. The system turns on again when a valid level is
applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or
operating system. INVALID indicates the receiver inputs’ condition, when using shutdown function, the INVALID
output is high when the device is on and low when the device is shut down.
Table 2. Shutdown Logic Control Truth Table
OPERATION STATUS
Normal Operation (Forced On)
Normal Operation (AutoShutdown)
Normal Operation (AutoShutdown)
Shutdown (Forced Off)
FORCEOFF
INPUT
H
H
H
L
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FORCEON
INPUT
H
L
L
X
INVALID
OUTPUT
X
H
L
X
T_OUT
Active
Active
High-Z
High-Z
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
Preliminary
CMOS IC
DETAILED DESCRIPTION(Cont.)
Table 2 summarizes the UTC UT3223 operating modes. FORCEON and FORCEOFF override the automatic
circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither
control is asserted, the IC selects between these states automatically based on receiver input levels.
Transmitters Enabled, INVALID High
+2.7V
Indeterminate
+0.3V
0V
Shutdown, Transmitters Disabled,
1µA Supply Current, INVALID Low
-0.3V
Indeterminate
-2.7V
Transmitters Enabled, INVALID High
Fig.1 Shutdown Input Levels
When shutdown, the UTC UT3223’s charge pumps are turned off, V+ decays to VCC, V- decays to ground, the
transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs.
Fig.2 Shutdown Input Timing
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UT3223

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
3.0V~5.5V
CBYPASS
VCC
V+
C1+
C1
C3
UTC
UT3223
C1C2+
V-
C2
C4
C2T1IN
LOGIC
INPUTS
T1OUT
T1
T2IN
T2OUT
T2
RS-232
OUTPUTS
T3OUT
VCC
GND
GND
FORCEOFF
FORCEON
EN
R1OUT
LOGIC
OUTPUTS
INVALID
SHUTDOWN
R1IN
R1
5kΩ
R2OUT
TO POWER
MANAGEMENT
UNIT
R2IN
R2
RS-232
INPUTS
5kΩ
GND
Fig.3 Application Circuit
Table 3. Required Capacitor Value
VCC (V)
3.0~3.6
3.15~3.6
4.5~5.5
3.0~5.5
C1 (µF)
0.22
0.1
0.047
0.22
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C2, C3, C4 (µF)
0.22
0.1
0.33
1.0
CBYPASS (µF)
0.22
0.1
0.047
0.22
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Preliminary
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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