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PDF ST2329 Data sheet ( Hoja de datos )
| Número de pieza | ST2329 | |
| Descripción | 2-bit dual supply level translator | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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ST2329
2-bit dual supply level translator
without direction control pin
Features
■ 90 Mbps (max) data rate when driven by a
totem pole driver
■ 8 Mbps (max) data rate when driven by an
)open drain pole driver
t(s■ Bidirectional level translation without
cdirection control pin
du■ Wide VL voltage range of 1.65 to 3.6 V
ro■ Wide VCC voltage range of 1.80 to 5.5 V
P■ Power down mode feature – when either
tesupply is off, all I/Os are in high impedance
le■ Low quiescent current (max 12 µA)
o■ Able to be driven by totem pole and open drain
bsdrivers
O■ 5.5 V tolerant enable pin
-■ ESD performance on all pins: ±2 kV HBM
t(s)■ Small package and footprint
QFN10L (1.8 x 1.4 mm) package
roducApplications
P■ Low voltage system level translation
te■ Mobile phones and other mobile devices
le■ I2C level translation
Obso■ UART level translation
QFN10L (1.8 x 1.4 mm)
Description
The ST2329 is a 2-bit dual supply level translator
which provides the level shifting capability to allow
data transfer in a multi-voltage system. Externally
applied voltages, VCC and VL, set the logic levels
on either side of the device. It utilizes
transmission gate-based design that allows
bidirectional level translation without a control pin.
The ST2329 accepts a VL from 1.65 to 3.6 V and
VCC from 1.80 to 5.5 V, making it ideal for data
transfer between low-voltage ASICs/PLD and
higher voltage systems. This device has a tri-state
output mode which can be used to disable all
I/Os.
The ST2329 supports power down mode when
VCC is grounded/floating and the device is
disabled via the OE pin.
Table 1.
Device summary
Order code
ST2329QTR
Package
QFN10L (1.8 x 1.4 mm)
Packaging
Tape and reel (3000 parts per reel)
May 2008
Rev 4
1/21
www.st.com
21
1 page  
ST2329
3 Supplementary notes
Supplementary notes
3.1 Driver requirement
The ST2329 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/OVCC and I/OVL ports, the user needs to
ensure that the driver is able to sink the required amount of current. For example, if the
settings are VCC = 5.5 V, VL = 4.3 V and the pull-up resistor is 10 kΩ, then the driver must be
able to sink at least (5.5 V/10 kΩ) + (4.3 V /10 kΩ) = 1 mA and still meet the VIL
requirements of the ST2329.
ct(s)3.2 Load driving capability
duTo support the open drain system, the one-shot transistor is turned on only during state
rotransition at the output side. When it drives a high state, after the one-shot transistor is
Pturned off, only the pull-up resistor is able to maintain the state. In this case, the resistive
teload is not recommended.
leDuring the translation from VCC side to VL side, the oscillation might be triggered when the
osignal is reflected back as a glitch. This is caused by the architecture of the device (auto-
sdirection).
ObWhen using the ST2329, care need to be taken in the PCB data-track design and output
-loading. It is recommended that the load is less than 25 pf.
ct(s)3.3 Power off feature
duIn some applications where it might be required to turn off one of the power supplies
ropowering up the level translator, the user may turn off the VCC only when the OE pin is low
P(device is disabled). There will be no current consumption in VL due to floating gates or
other causes, and the I/Os are in a high-impedance state in this mode.
solete3.4 Truth table
Ob Table 3. Truth table
Enable
Bidirectional Input/Output
OE
H (1)
H(1)
L
1. High level VL power supply referred
2. High level VCC power supply referred
3. Z = high impedance
I/OVCC
H (2)
L
Z (3)
I/OVL
H(1)
L
Z(3)
5/21
5 Page 
ST2329
Electrical characteristics
5.2
Table 10.
Symbol
AC characteristics (device driven by totem pole driver )
AC characteristics (test conditions: VL = 1.65 −1.8 V (load CL = 15 pF; Rup = 10 kΩ; driver
tr=tf ≤ 2 ns) over temperature range -40 °C to 85 °C)
Parameter
VCCB = 1.8 – 2.5 V VCCB = 2.7 – 3.6 V VCCB = 4.3 – 5.5 V
Unit
Min Max Min Max Min Max
tRVCC Rise time I/OVCC
7 3 4 ns
tFVCC Fall time I/OVCC
7 3 3 ns
tRVL Rise time I/OVL
6 4 5 ns
tFVL Fall time I/OVL
4 4 4 ns
Propagation delay time
t(s)tI/OVL- I/OVL-LH to I/OVCC-LH
tPLH
6
5
4 ns
VCC I/OVL-HL to I/OVCC-HL
tPHL
5
5
5 ns
ductI/OVCC-
roVL
Propagation delay time
I/OVCC-LH to I/OVL-LH
I/OVCC-HL to I/OVL-HL
tPLH
tPHL
6
4.5
5
5.2
4 ns
7 ns
PtPZL tPZH Output enable and
En
10
10
10 ns
tetPLZ tPHZ disable time
Dis
40
40
40 ns
oleDR Data rate(1)
12 32 32 MHz
bs1. The data rate is guaranteed based on the condition that the output I/O signal rise/fall time is less than 15% of the input I/O
signal period; the input I/O signal is at 50% duty cycle and the output I/O signal duty cycle deviation not less than 30%.
) - OTable 11.
duct(sSymbol
AC characteristics (test conditions: VL = 2.5 −2.7 V (load CL = 15 pF; Rup = 10 kΩ; driver
tr = tf ≤2 ns) over temperature range -40 °C to 85 °C)
Parameter
VCC = 2.7 −3.6 V
Min Max
VCC = 4.3 −5.5 V
Min Max
Unit
ProtRVCC
tetFVCC
oletRVL
ObstFVL
Rise time I/OVCC
Fall time I/OVCC
Rise time I/OVL
Fall time I/OVL
6 4 ns
3 3 ns
5 5 ns
3 3 ns
Propagation delay time tPLH
3.5
3
tI/OVL-VCC I/OVCC-LH to I/OVL-LH
I/OVCC-HL to I/OVL-HL
tPHL
4
4 ns
tI/OVCC-VL
Propagation delay time
I/OVCC-LH to I/OVL-LH
I/OVCC-HL to I/OVL-HL
tPLH
tPHL
2.5
4
ns
2.1
ns
ns
4
ns
11/21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ST2329.PDF ] | |
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