ST ST2349A User Manual
Features
■ 18 Mbps (max) data rate when driven by a
totem pole driver
■ 6.8 Mbps (max) data rate when driven by an
open drain pole driver
■ Bi-directional level translation without
direction control pin
■ Wide V
■ Wide V
■ Power down mode feature – when either
voltage range of 1.65 to 3.6 V
L
voltage range of 1.80 to 5.5 V
CC
supply is off, all I/Os are in high impedance
■ Low quiescent current (max 8 µA)
■ Able to be driven by totem pole and open drain
drivers
■ 5.5 V tolerant enable pin
■ ESD performance on all pins: ±2 kV HBM
■ Small package and footprint
QFN16 (2.6 x 1.8 mm) package
Applications
■ Low voltage system level translation
■ Mobile phones and other mobile devices
2
■ I
C level translation
■ UART level translation
ST2349A
4-bit dual supply level translator
without direction control pin
QFN16
(2.6x1.8mm)
Description
The ST2349A is a 4-bit dual supply level
translator which provides the level shifting
capability to allow data transfer in a multi-voltage
system. Externally applied voltages, V
set the logic levels on either side of the device. It
utilizes transmission gate-based design that
allows bi-directional level translation without a
control pin.
The ST2349A accepts a V
and V
from 1.80 to 5.5 V, making it ideal for
CC
from 1.65 to 3.6 V
L
data transfer between low-voltage ASICs/PLD
and higher voltage systems. This device has a tristate output mode which can be used to disable
all I/Os.
The ST2349A supports power down mode when
V
is grounded/floating and the device is
CC
disabled via the OE pin.
and VL,
CC
Table 1. Device summary
Order code Package Packaging
ST2349AQTR QFN16 (2.6 x 1.8 mm) Tape and reel (3000 parts per reel)
June 2009 Doc ID 14908 Rev 2 1/20
www.st.com
20
Contents ST2349A
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Device block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Supplementary notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Driver requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Load driving capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Power off feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2.1 Device driven by open drain driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2.2 Device driven by totem pole driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20 Doc ID 14908 Rev 2
ST2349A Pin settings
1 Pin settings
1.1 Pin connection
Figure 1. ST2349A pin connection (top through view)
)/
I/O
)/
1.2 Pin description
Table 2. ST2349A pin description
Pin number Symbol Name and function
1I/O
2 OE Output enable
3I/O
4I/O
5 NC No connection
6V
7V
8 NC No connection
9 I/O
10 I/O
11 GND Ground
6,
/%
6,
6,
6,
)/
6,6##)/
,
6
.#
6##
)/
.#
##
'.$
)/
/)
6##
6##
6##
6
VL2
VL3
VL4
L
CC
VCC4
VCC3
Data input/output
Data input/output
Data input/output
Supply voltage
Supply voltage
Data input/output
Data input/output
12 I/O
13 I/O
14 V
15 V
16 I/O
VCC2
VCC1
CC
L
VL1
Data input/output
Data input/output
Supply voltage
Supply voltage
Data input/output
Doc ID 14908 Rev 2 3/20
Device block diagrams ST2349A
2 Device block diagrams
Figure 2. ST2349A block diagram
Figure 3. Application block diagram
V
V
L
0.1
μ
F
VL
system
controller
V
V
V
L VL
L
L
V
L
I/O
VL1
I/O
VL2
I/O
VL3
I/O
VL4
OE
V
I/O
I/O
I/O
I/O
CC
VCC1
VCC2
VCC3
VCC4
VCCVCCVCCV
CC
CC
V
system
controller
0.1 μF
CC
1μF
CD00023
4/20 Doc ID 14908 Rev 2
ST2349A Supplementary notes
3 Supplementary notes
3.1 Driver requirement
The ST2349A may be driven by an open drain or totem pole driver and the nature of the
device’s output is “open drain”. It must not be used to drive a pull-down resistor since the
impedance of the output at HIGH state depends on the pull-up resistor placed at the I/Os.
As the device has pull-up resistors on both the I/O
ensure that the driver is able to sink the required amount of current. For example, if the
settings are V
=5.5V, VL= 4.3 V and the pull-up resistor is 10 kΩ, then the driver must be
CC
able to sink at least (5.5 V/10 kΩ) + (4.3 V/10 kΩ)
requirements of the ST2349A.
3.2 Load driving capability
To support the open drain system, the one-shot transistor is turned on only during high
transition at the output side. When it drives a high state, after the one-shot transistor is
turned off, only the pull-up resistor is able to maintain the state. In this case, the resistive
load is not recommended.
3.3 Power off feature
In some applications where it might be required to turn off one of the power supplies
powering up the level translator, the user may turn off the V
(device is disabled). There will be no current consumption in V
other causes, and the I/Os are in a high-impedance state in this mode.
3.4 Truth table
and I/OVL ports, the user needs to
VCC
= 1 mA and still meet the V
only when the OE pin is low
CC
due to floating gates or
L
IL
Table 3. Truth table
Enable Bi-directional Input/Output
OE I/O
(1)
H
(1)
H
L Z
1. High level VL power supply referred
2. High level VCC power supply referred
3. Z = high impedance
VCC
(2)
H
L L
(3)
I/O
H
Z
(1)
(3)
VL
Doc ID 14908 Rev 2 5/20
Maximum rating ST2349A
4 Maximum rating
Stressing the device above the rating listed in the “Absolute maximum ratings” table may
cause permanent damage to the device. These are stress ratings only, and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
Supply voltage -0.3 to 4.6 V
L
V
V
V
I/OVL
V
I/OVCC
I
I/OVL
I
I/OVCC
I
SCTOUT
P
T
ESD Electrostatic discharge protection (HBM) ±2 kV
Supply voltage -0.3 to 6.5 V
CC
DC control input voltage -0.3 to 6.5 V
OE
DC I/OVL input voltage (OE = GND or VL) -0.3 to VL + 0.3 V
DC I/O
DC input diode current -20 mA
I
IK
input voltage (OE = GND or VL) -0.3 to VCC + 0.3 V
VCC
DC output current ±25 mA
DC output current ±258 mA
Short circuit duration, continuous 40 mA
Power dissipation
D
Storage temperature -65 to 150
STG
(1)
500 mW
TL Lead temperature (10 seconds) 300
o
C
o
C
1. 500mW: 65oC derated to 300 mW by 10W/oC: 65oC to 85oC
4.1 Recommended operating conditions
Table 5. Recommended operating conditions
Symbol Parameter Min Typ Max Unit
V
V
CC
V
VI/O
VI/O
T
dt/dV Input rise and fall time 0 1 ns/V
1. VCC must be greater than VL.
6/20 Doc ID 14908 Rev 2
Supply voltage 1.65 3.6 V
L
(1)
Supply voltage 1.8 5.5 V
Input voltage
OE
(OE output enable pin, VL power supply referred)
I/OVL voltage 0 V
VL
I/O
VCC
op
voltage 0 V
VCC
Operating temperature -40 85
03.6V
L
CC
V
V
o
C
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