ST2329QTR STMicroelectronics, ST2329QTR Datasheet - Page 5

• Manufacturer Part Number: ST2329QTR
• Description: IC LEVEL XLATOR 2BIT DUAL 10-QFN
• Manufacturer: STMicroelectronics

Specifications of ST2329QTR

• Logic Function: Translator, Bidirectional, Open Drain
• Number Of Bits: 2
• Input Type: Logic
• Output Type: Logic
• Data Rate: 90Mbps
• Number Of Channels: 2
• Number Of Outputs/channel: 1
• Differential - Input:output: No/No
• Propagation Delay (max): 4ns
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 10-QFN
• Supply Voltage: 1.8 V ~ 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6907-2; ST2329QTR

ST2329
3
3.1
3.2
3.3
3.4
Supplementary notes
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/O
ensure that the driver is able to sink the required amount of current. For example, if the
settings are V
able to sink at least (5.5 V/10 kΩ) + (4.3 V /10 kΩ)
requirements of the ST2329.
Load driving capability
To support the open drain system, the one-shot transistor is turned on only during state
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.
During the translation from V
signal is reflected back as a glitch. This is caused by the architecture of the device (auto-
direction).
When 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.
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.
Truth table
Table 3.
1. High level V
2. High level V
3. Z = high impedance
Enable
H
H
OE
L
Truth table
L
CC
(1)
(1)
CC
power supply referred
power supply referred
= 5.5 V, V
L
= 4.3 V and the pull-up resistor is 10 kΩ , then the driver must be
CC
side to V
I/O
L
H
Z
side, the oscillation might be triggered when the
L
VCC
(3)
(2)
Bidirectional Input/Output
VCC
=
1 mA and still meet the V
and I/O
CC
VL
L
only when the OE pin is low
due to floating gates or
ports, the user needs to
Supplementary notes
I/O
H
Z
L
(3)
(1)
VL
IL
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