UM3221E/UM3222E/UM3232E
Fail-Safe, Single Supply RS-232 Transceivers
UM3221E/UM3222E/UM3232E
General Description
The UM3221E/UM3222E/UM3232E series are 3.3V powered RS-232 transceivers intended for
portable or hand-held applications. The UM3221E has one driver/one receiver while the
UM3222E/UM3232E has two drivers/two receivers. The device features low power consumption,
high data-rate capability and enhanced ESD protection. The ESD rating of all transmitter outputs
and receiver inputs is ±15kV for both human body mode and IEC61000-4-2 air discharge methods,
and over ±8kV for IEC61000-4-2 contact discharge methods. The logic I/O pins are protected to
±2kV for human body mode.
Small footprint, low profile package and the use of small 0.1μF capacitors ensure board space
savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. This
family is fully compatible with 3.3V-only systems, mixed 1.8V and 3.3V systems, mixed 3.3V and
5.0V systems and 5.0V-only systems.
The UM3221E/UM3222E has a low-power shutdown mode where the devices’ driver outputs and
charge pumps are disabled. During shutdown, the supply current falls to less than 1μA that
reduces power consumption in battery-powered portable systems or other low power consumption
systems. The UM3221E/UM3222E receivers remain active in shutdown mode, allowing
monitoring of external signals.
The UM3221E/UM3222E and UM3232E are pin, package, and functionally compatible with the
industry standard MAX242 and MAX 232, respectively.
Applications
Industrial Automation Equipments
Battery-Powered Equipments
Hand-Held Equipments
POS Terminals
Features
Meets True EIA/TIA-232-F Standards from a +3.0V to +5.5V Power Supply
Meets EIA/TIA-562 Levels of ±3.7V with Supply Voltages as Low as 2.7V
Enhanced ESD Specifications:
±15kV Human Body Mode
±15kV IEC61000-4-2 Air Discharge Mode
±8kV IEC61000-4-2 Contact Discharge Mode
1μA Low Power Shutdown (UM3221E/UM3222E)
250kbps Minimum Transmission Rate
Guaranteed 30V/μs Max Slew Rate
Latch-Up Performance Exceeds 200mA
Hot Swap and Fail-Safe
I/O Logic Compatible with 1.8V Logic @ Vcc=3.3V
________________________________________________________________________
http://www.union-ic.com Rev.06 Dec.2013
1/15
UM3221E/UM3222E/UM3232E
Ordering Information
Part Number
UM3221EEAE
UM3221EEUE
UM3222EEUE
UM3232EESE
UM3232EEPE
UM3232EEUE
UM3232EEAE
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package Type
SSOP16
TSSOP16
TSSOP20
SOP16
DIP16
TSSOP16
SSOP16
Absolute Maximum Ratings (Note 1)
Symbol
V
CC
V
+
V
-
T_IN
R_IN
T_OUT
R_OUT
Parameter
Supply Voltage on V
CC
Voltage on V
+
Voltage on V
-
Voltage on T_IN
Voltage on R_IN
Voltage on T_OUT
Voltage on R_OUT
Short-Circuit Duration, T_OUT
SSOP16
P
D
Continuous Power Dissipation
at T
A
= 70°C
TSSOP20
SOP16
DIP16
TSSOP16
T
A
T
STG
T
L
Operating Temperature Range
Storage Temperature Range
Maximum Lead Temperature for soldering
10 seconds
Value
-0.3 to +6
(V
CC
- 0.3) to +7.5
-7.5 to +0.3
-0.3 to (V
CC
+ 0.3)
±30
(V
-
- 0.3) to (V
+
+ 0.3)
-0.3 to (V
CC
+ 0.3)
Continuous
775
879
696
842
754
-40 to +85
-65 to +165
+300
°C
°C
°C
mW
Unit
V
V
V
V
V
V
V
Note 1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
________________________________________________________________________
http://www.union-ic.com Rev.06 Dec.2013
2/15
UM3221E/UM3222E/UM3232E
Electrical Characteristics
(V
CC
=+3.0V to +5.5V, C1- C4=0.1μF, T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
=25℃)
Parameter
Symbol
Conditions
DC CHARACTERISTICS
( V
CC
=+3.3V or +5V, T
A
=25℃)
V
CC
Supply Current
I
CC
/SHDN= V
CC
, No load
Shutdown Supply
I
SHDN
/SHDN= GND
Current
LOGIC INPUTS
Input Leakage Current
T_IN, /SHDN, /EN
Input Threshold Low
Input Threshold High
Transmitter
Input Hysteresis
RECEIVER OUTPUTS
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Short-Circuit
Current
T
A
= +25°C
T
A
= +25°C
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
V
OL
V
OH
V
CC
= 3.3V, I
OUT
= 10mA
V
CC
= 5.0V, I
OUT
= 10mA
V
CC
= 3.3V, I
OUT
= -3.0mA
V
CC
= 5.0V, I
OUT
= -3.0mA
0.8
0.8
2.8
4.4
-30
0.8
0.8
30
1.15
1.55
1.35
1.75
0.2
5
±6.0
±30
±40
±60
±60
V
V
V
V
2
2
7
V
V
kΩ
V
mA
mA
V
IL
V
IH
T_IN,
/SHDN, /EN
T_IN,
/SHDN, /EN
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
1.6
2.2
0.2
0.15
Min
Typ
0.3
Max
1
1
±1
0.8
0.8
Unit
mA
μA
μA
V
V
V
V
CC
= 3.3V
V
CC
= 5.0V
T
A
= +25°C
All drivers loaded with 3kΩ
to ground
Short to
V
CC
, GND
or other TXD
pin
V
CC
= 3.3V
V
CC
= 5.0V
3
±5.0
________________________________________________________________________
http://www.union-ic.com Rev.06 Dec.2013
3/15
UM3221E/UM3222E/UM3232E
Electrical Characteristics (Continued)
(V
CC
=+3.0V to +5.5V, C1- C4=0.1μF, T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
=25℃)
Parameter
Symbol
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation
Delay
Receiver Skew
Transmitter
Propagation Delay
Transmitter Skew
t
PLH
, t
PHL
|t
PHL
-t
PLH
|
t
PLH
, t
PHL
|t
PHL
-t
PLH
|
3
15
R
L
= 3kΩ,
C
L
= 2500pF,
all transmitters loaded
Figure 1
0.9
0.1
Conditions
R
L
= 3kΩ to 7kΩ,
C
L
= 50pF to 1000pF,
one transmitter switching
All parts,
C
L
= 150pF
normal
Figure 1
operation
Min
Typ
250
0.15
0.1
Max
Unit
kbps
μs
μs
μs
μs
T
A
= +25°C, V
CC
= 3.3V,
R
L
= 3kΩ to 7kΩ, C
L
= 50pF
Transition-Region
to 1000pF, measured from
Slew Rate
-3V to +3V or +3V to -3V,
Figure 1
ESD AND LATCH UP PERFORMANCE
Human Body Model
R_IN, T_OUT
IEC61000-4-2,
ESD-Protection
Contact Discharge
Voltage
IEC61000-4-2,
Air-Gap Discharge
Logic Pin
Human Body Model
ESD-Protection
Voltage
Latch Up Performance
JEDEC Standard No.78D
30
V/μs
±15
±8
±15
±2
±200
kV
mA
kV
________________________________________________________________________
http://www.union-ic.com Rev.06 Dec.2013
4/15
UM3221E/UM3222E/UM3232E
Pin Configurations
SSOP16/TSSOP16
TSSOP20
SOP16/DIP16/TSSOP16/SSOP16
Pin Description
Pin No.
UM3222E
1
2
3
4
5
6
7
8, 17
9, 16
10, 15
12, 13
18
19
20
Pin Name
______
UM3221E
1
2
3
4
5
6
7
13
8
9
11
14
15
16
UM3232E
-
1
2
3
4
5
6
7, 14
8, 13
9, 12
10, 11
15
16
-
Function
Receiver Enable. Active low.
Positive terminals of voltage-doubler
charge pump capacitor
Positive voltage generated by the charge
pump
Negative terminals of voltage-doubler
charge pump capacitor
Positive terminals of inverting charge
pump capacitor
Negative terminals of inverting charge
pump capacitor
Negative voltage generated by the
charge pump
RS-232 Driver Outputs
RS-232 Receiver Inputs
RS-232 Receiver Outputs
RS-232 Driver Inputs
Ground
+3.0V to +5.5V Supply Voltage Input
Shut off pump power and transmitters.
Active low.
EN
C1+
V+
C1-
C2+
C2-
V-
T_OUT
R_IN
R_OUT
T_IN
GND
V
CC
____________
SHDN
________________________________________________________________________
http://www.union-ic.com Rev.06 Dec.2013
5/15
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
