UM3211P
Bidirectional voltage level translator for open-drain and
push-pull applications
UM3211P
SOT363
General Description
The UM3211P is a bidirectional voltage level translator operational from 1.0V to 3.6V (V
CCA
) and
1.8V to 5.5V (V
CCB
), which allows bidirectional voltage translations between 1.0V and 5V
without the need for a direction pin in open-drain or push-pull applications. The UM3211P is a
1-bit level translator. Its transmission speeds are below 33MHz for an open-drain system with a
50pF capacitance and a pull-up resistor of 197Ω.
The low ON-state resistance (R
on
) of the switch allows connections to be made with minimal
propagation delay. When EN is high, the translator switch is ON, and the A I/O is connected to
the B I/O, allowing bidirectional data flow between ports. When EN is low, the translator switch
is off, and a high-impedance state exists between ports.
The translators provide excellent ESD protection to lower voltage devices, and at the same time
protect less ESD-resistant devices.
Applications
SPI, MICROWIRE, and I
2
C Level
Translation
Low-Voltage ASIC Level Translation
Smart Card Readers
Cell-phone Cradles
Portable POS Systems
Portable Communication Devices
Low-Cost Serial Interfaces
Cell-Phones
GPS
Telecommunications Equipment
Consumer Electronics
Household Appliances
Features
Provides bidirectional voltage translation
with no direction pin
Less than 1.5 ns maximum propagation
delay
Low 3.5Ω ON-state connection between
input and output ports provides less signal
distortion
5V tolerant I/O ports to support
mixed-mode signal operation
High-impedance A and B pins for
EN = LOW
Latch up free operation
Flow through pinout for ease of
printed-circuit board trace routing
ESD protection exceeds:
4kV HBM per JESD22-A114
Package offered: SOT363
Pin Configurations
(Top View)
Top View
M: Month Code
UM3211P SOT363
________________________________________________________________________
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UM3211P
Pin Description
Pin Number
1
2
3
4
5
6
Symbol
A
VCCA
GND
EN
VCCB
B
Function
Low-voltage side; connected to VCCA through a pull-up
resistor
Low-voltage side reference supply voltage for A
Ground (0V)
Switch enable input; connected to VCCB and pulled-up
through a high resistor
High-voltage side reference supply voltage for B
High-voltage side; connected to VCCB through a pull-up
resistor
Ordering Information
Part Number
UM3211P
Packaging Type
SOT363
Marking Code
UA3
Shipping Qty
3000pcs/7Inch
Tape & Reel
Absolute Maximum Ratings (Note 1)
Over operating free-air temperature range (unless otherwise noted)
Symbol
Parameter
V
CCA
Reference Voltage (A)
V
CCB
Reference Voltage (B)
V
I
V
I/O
I
ch
I
IK
T
stg
Input Voltage
Voltage on an input/output pin
Channel Current (DC)
Input Clamp Current
Storage Temperature
V
I
＜0V
Value
-0.5 to +6
-0.5 to +6
-0.5(Note 2) to +6
-0.5(Note 2) to +6
+128
-50
-65 to +150
Unit
V
V
V
V
mA
mA
°C
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 under "recommended
operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for
extended periods may affect device reliability.
Note 2: The input and input/output negative voltage ratings may be exceeded if the input and
input/output clamp current ratings are observed.
________________________________________________________________________
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UM3211P
Recommended Operating Conditions
Symbol
V
I/O
V
CCA
(Note 3)
V
CCB
(Note 3)
V
I(EN)
I
sw(pass)
T
amb
Parameter
Voltage on an input/output pin
Reference Voltage (A)
Reference Voltage (B)
Input Voltage on pin EN
Pass Switch Current
Ambient Temperature
Operating in free-air
-40
Conditions
A, B
VCCA
VCCB
Min
0
0
0
0
Max
5.5
5.5
5.5
5.5
64
+85
Unit
V
V
V
V
mA
°C
Note 3: V
CCA
≤
V
CCB
−1
V for best results in level shifting applications.
Electrical Characteristics
T
amb
=
−40
°C to +85 °C, unless otherwise specified.
Symbol
V
IK
I
IH
C
i(EN)
Parameter
Input Clamping
Voltage
HIGH-level
Input Current
Input
Capacitance on
pin EN
Off-state
input/output
capacitance
On-state
input/output
capacitance
Conditions
I
I
=
−18mA;
V
I(EN)
= 0V
V
I
= 5V;
V
I(EN)
= 0V
V
I
= 0V or 3V
12
Min
Typ
(Note 4)
Max
-1.2
5
Unit
V
uA
pF
A, B;
C
io(off)
V
O
= 0V or 3V ;
10
12
pF
V
I(EN)
= 0V
A, B;
12.5
C
io(on)
V
O
= 0V or 3V ;
8
pF
(Note 5)
V
I(EN)
= 3V
A, B;
V
I
= 0V; I
O
= 64mA;
1
2.5
5.0
ON-state
V
I(EN)
= 4.5V(Note 7)
R
on
resistance
Ω
A, B;
(Note 6)
V
I
= 2.4V; I
O
= 15mA;
4.5
7.5
V
I(EN)
= 4.5V
Note 4: All typical values are at T
amb
= 25°C.
Note 5: Not production tested, maximum value based on characterization data of typical parts.
Note 6: Measured by the voltage drop between the A and B terminals at the indicated current
through the switch. ON-state resistance is determined by the lowest voltage of the two
terminals.
Note 7: Guaranteed by design.
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UM3211P
Switching Characteristics (translating down)
Over recommended operating free-air temperature range(unless otherwise noted). Values
guaranteed by design.
C
L
=50pF
C
L
=30pF
C
L
=15pF
Test
Symbol
Parameter
Unit
Conditions
Min Max Min Max Min Max
V
I(EN)
= 3.3V; V
IH
= 3.3V; V
IL
= 0V; V
M
=1.15V(see Figure 1).
t
PLH
LOW to
HIGH
propagation
delay
HIGH to
LOW
propagation
delay
LOW to
HIGH
propagation
delay
HIGH to
LOW
propagation
delay
0
from (input)
B to (output)
A
0
3.5
0
3.0
0
2.3
ns
3.5
0
2.7
0
2.2
ns
t
PHL
V
I(EN)
=2.5V; V
IH
= 2.5V; V
IL
= 0V; V
M
= 0.75V (see Figure 1).
t
PLH
0
from (input)
B to (output)
A
0
4.0
0
3.0
0
2.3
ns
3.5
0
2.7
0
2.2
ns
t
PHL
Switching Characteristics (translating up)
Over recommended operating free-air temperature range(unless otherwise noted). Values
guaranteed by design.
C
L
=50pF
C
L
=30pF
C
L
=15pF
Test
Symbol
Parameter
Unit
Conditions
Min
Max Min
Max Min Max
V
I(EN)
= 3.3V; V
IH
= 2.3V; V
IL
= 0V; V
TT
= 3.3V; V
M
= 1.15V; R
L
= 300Ω(see Figure 1).
t
PLH
LOW to
HIGH
propagation
delay
HIGH to
LOW
propagation
delay
LOW to
HIGH
propagation
delay
HIGH to
LOW
propagation
delay
0
from (input)
A to (output)
B.
0
4.35
0
3.25
0
2.4
ns
3.35
0
2.5
0
2.0
ns
t
PHL
V
I(EN)
=2.5V; V
IH
= 1.5V; V
IL
= 0V; V
TT
= 2.5V; V
M
= 0.75V; R
L
= 300Ω (see Figure 1).
t
PLH
0
from (input)
A to (output)
B.
0
4.5
0
3.5
0
2.5
ns
3.35
0
2.5
0
2.0
ns
t
PHL
________________________________________________________________________
http://www.union-ic.com Rev.01 Dec.2013
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UM3211P
Applications Information
Detail Description
The UM3211P is a bidirectional voltage level translator operational from 1.0V to 3.6V (V
CCA
) and
1.8V to 5.5V (V
CCB
), which allows bidirectional voltage translations between 1.0V and 5V
without the need for a direction pin in open-drain or push-pull applications.
When the A or B port is LOW, the clamp is in the ON-state and a low resistance connection exists
between the A and B ports. The low ON-state resistance (R
on
) of the switch allows connections to
be made with minimal propagation delay. Assuming the higher voltage is on the B port when the
B port is HIGH, the voltage on the A port is limited to the voltage set by V
CCA
. When the A port is
HIGH, the B port is pulled to the drain pull-up supply voltage (V
pu(D)
) by the pull-up resistors.
This functionality allows a seamless translation between higher and lower voltages selected by the
user without the need for directional control.
When EN is HIGH, the translator switch is on, and the A I/O is connected to the B I/O, allowing
bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a
high-impedance state exists between ports. The EN input circuit is designed to be supplied by
V
CCB
. To ensure the high-impedance state during power-up or power-down, EN must be LOW.
All channels have the same electrical characteristics and there is minimal deviation from one
output to another in voltage or propagation delay. This is a benefit over discrete transistor voltage
translation solutions, since the fabrication of the switch is symmetrical.
________________________________________________________________________
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