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TI-TCA39306-Q1.pdf
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TCA39306-Q1 Dual Bidirectional I
2
C Bus and SMBus Voltage-Level Translator
1 Features
• 2-Bit bidirectional translator for SDA and SCL lines
in mixed-mode I
2
C applications
• Standard-mode, fast-mode, and fast-mode plus
I
2
C and SMBus compatible
• I
3
C compatible (12.5 MHz supported)
• Allows voltage-level translation between
– 0.9-V V
REF1
and 1.8-V, 2.5-V, 3.3-V,
or 5-V V
REF2
– 1.2-V V
REF1
and 1.8-V, 2.5-V, 3.3-V,
or 5-V V
REF2
– 1.8-V V
REF1
and 2.5-V, 3.3-V, or 5-V V
REF2
– 2.5-V V
REF1
and 3.3-V or 5-V V
REF2
– 3.3-V V
REF1
and 5-V V
REF2
• Provides bidirectional voltage translation with no
direction Pin
• Low ON-state resistance between input and output
ports provides less signal distortion
• Open-drain I
2
C I/O ports (SCL1, SDA1, SCL2, and
SDA2)
• 5-V Tolerant I
2
C I/O ports to support mixed-mode
signal operation
• High-impedance SCL1, SDA1, SCL2, and SDA2
pins for EN = Low
• Lockup-free operation for isolation when EN = Low
• Flow-through pinout for ease of printed-circuit-
board trace routing
• ESD lrotection Exceeds JESD 22
– 2000-V human-body model (A114-A)
– 1000-V charged-device model (C101)
2 Applications
• I
2
C, SMBus, PMBus, MDIO, UART, low-speed
SDIO, GPIO, and other two-signal interfaces
• Servers
• Routers (telecom switching equipment)
• Personal computers
• Industrial automation
3 Description
The TCA39306-Q1 is a dual bidirectional voltage-level
translator compatible with I
2
C, SMBus, and I
3
C with
an enable (EN) input, and is operational from 0.9-V to
3.3-V V
REF1
and 1.8-V to 5.5-V V
REF2
.
The device allows bidirectional voltage translations
between 0.85 V and 5 V, without the use of a
direction pin. 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 SCL1 and SDA1
I/O are connected to the SCL2 and SDA2 I/O,
respectively, allowing bidirectional data flow between
ports. When EN is low, the translator switch is off, and
a high-impedance state exists between ports.
In addition to voltage translation, the TCA39306-
Q1 can be used to isolate a higher speed bus
from a lower speed bus by controlling the EN
pin to disconnect the slower bus during fast-mode
communication.
Device Information
PART NUMBER PACKAGE
(1)
BODY SIZE (NOM)
TCA39306-Q1 VSSOP (8) 2.30 mm x 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
TCA39306I2C, SMBus, or
I3C Controller
Responder
devices
SCL1
SDA1
SCL1
SDA1
VREF2VREF1
EN
200kΩ
Simplified Application Diagram
ADVANCE INFORMATION
TCA39306-Q1
SCPS239 – JUNE 2021
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change
without notice.
Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
6 Specifications.................................................................. 4
6.1 Absolute Maximum Ratings ....................................... 4
6.2 ESD Ratings .............................................................. 4
6.3 Recommended Operating Conditions ........................4
6.4 Thermal Information ...................................................5
6.5 Electrical Characteristics ............................................5
6.6 Switching Characteristics (Translating Down) ............6
6.7 Switching Characteristics (Translating Up) ................ 7
6.8 Switching Characteristics ...........................................8
7 Parameter Measurement Information............................ 9
8 Detailed Description......................................................12
8.1 Overview................................................................... 12
8.2 Functional Block Diagram......................................... 17
8.3 Feature Description...................................................17
8.4 Device Functional Modes..........................................17
9 Application and Implementation.................................. 18
9.1 Application Information............................................. 18
9.2 Typical Application.................................................... 18
9.3 Systems Examples: I3C Usage Considerations....... 20
10 Power Supply Recommendations..............................23
11 Layout........................................................................... 24
11.1 Layout Guidelines................................................... 24
11.2 Layout Example...................................................... 24
12 Device and Documentation Support..........................25
12.1 Receiving Notification of Documentation Updates..25
12.2 Support Resources................................................. 25
12.3 Trademarks............................................................. 25
12.4 Electrostatic Discharge Caution..............................25
12.5 Glossary..................................................................25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES
June 2021 * Initial Release
TCA39306-Q1
SCPS239 – JUNE 2021
www.ti.com
ADVANCE INFORMATION
2 Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: TCA39306-Q1
5 Pin Configuration and Functions
1GND 8 EN
2V
REF1
7 V
REF2
3SCL1 6 SCL2
4SDA1 5 SDA2
Figure 5-1. DCU Package, 8-Pin VSSOP, Top View
Table 5-1. Pin Functions
PIN
I/O DESCRIPTION
NAME
NO.
DCU
EN 8 I Switch enable input
GND 1 — Ground, 0 V
SCL1 3 I/O Serial clock, low-voltage side
SCL2 6 I/O Serial clock, high-voltage side
SDA1 4 I/O Serial data, low-voltage side
SDA2 5 I/O Serial data, high-voltage side
V
REF1
2 I Low-voltage-side reference supply voltage for SCL1 and SDA1
V
REF2
7 I High-voltage-side reference supply voltage for SCL2 and SDA2
www.ti.com
TCA39306-Q1
SCPS239 – JUNE 2021
ADVANCE INFORMATION
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
3
Product Folder Links: TCA39306-Q1
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1)
MIN MAX UNIT
V
REF1
DC reference voltage range –0.5 7 V
V
REF2
DC reference bias voltage range –0.5 7 V
V
I
Input voltage range
(2)
–0.5 7 V
V
I/O
Input-output voltage range
(2)
–0.5 7 V
Continuous channel current 128 mA
I
IK
Input Clamp Current (V
I
< 0 ) –50 mA
T
J(Max)
Junction temperature 150 °C
T
stg
Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the device. These are stress
ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated
under Recommended Operating Condition. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
(2) The input and input-output negative voltage ratings may be exceeded if the input and output current ratings are observed.
6.2 ESD Ratings
VALUE UNIT
V
(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/
JEDEC JS-001, all pins
(1)
±2000
V
Charged device model (CDM), per JEDEC
specification JS-002, all pins
(2)
±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
I/O
Input-output voltage
SCL1, SDA1, SCL2,
SDA2
0 5.5 V
V
REF1
(1)
Reference Voltage 0 5.5 V
V
REF2
(1)
Reference Voltage 0 5.5 V
EN-
Switch
(2)
Switch mode enable voltage (Switch mode enable voltage) 1.5 5.5 V
EN Enable input voltage 0 5.5 V
I
PASS
Pass switch current 64 mA
T
A
Ambient temperature –40 125 °C
(1) To support translation, V
REF1
supports 0.85 V to VREF2 - 0.6 V. V
REF2
must be between VREF1 + 0.6 V to 5.5 V. See Typical
Application for more information.
(2) To support switching, V
REF1
and V
REF2
Do not need to be connected. EN pin should use a voltage not less than 1.5V when the switch
mode is to be enabled. Enabled voltage on this pin should be equal to 1.5V or I/O supply voltage, whichever is higher.
TCA39306-Q1
SCPS239 – JUNE 2021
www.ti.com
ADVANCE INFORMATION
4 Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: TCA39306-Q1
6.4 Thermal Information
THERMAL METRIC
(1)
TCA39306
UNITDCU
8 PINS
R
θJA
Junction-to-ambient thermal resistance 275.5 °C/W
R
θJC(top)
Junction-to-case (top) thermal resistance 127.1 °C/W
R
θJB
Junction-to-board thermal resistance 186.9 °C/W
Ψ
JT
Junction-to-top characterization parameter 65.7 °C/W
Ψ
JB
Junction-to-board characterization parameter 185.9 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN
TYP
(1)
MAX UNIT
V
IK
Input clamp voltage I
I
= -18 mA EN = 0 V -1.2 0 V
I
IH
Input leakage current
V
I
= 5 V, V
O
= 0V
EN = 0 V 5 µA
V
T
Threshold voltage I
O
= 500 µA
V
I
= 0.1 V, V
O
= 0 V, Find
V
EN
where IO = 500 µA
0.7 1.0 V
C
I(EN)
Input capacitance
V
I
= 3 V or 0
V
11 pF
C
IO(off)
Off capacitance SCLn, SDAn
V
O
= 3 V or 0
V
EN = 0 V 4 6 pF
C
IO(on)
On capacitance SCLn, SDAn
V
O
= 3 V or 0
V
EN = 3 V 10.5 12.5 pF
R
ON
(2)
On-state resistance
SCLn, SDAn (-40 to
85C)
V
I
= 0 V
(3)
I
O
= 64 mA EN = 4.5 V 3.5 5.5 Ω
V
I
= 0 V
(3)
I
O
= 64 mA EN = 3 V 4.7 7 Ω
V
I
= 0 V
(3)
I
O
= 64 mA EN = 2.3 V 6.3 9.5 Ω
V
I
= 0 V
(3)
I
O
= 15 mA EN = 1.5 V 25.5 32 Ω
V
I
= 2.4 V
(4)
I
O
= 15 mA EN = 4.5 V 1 6 15 Ω
V
I
= 1.7 V
(4)
I
O
= 15 mA EN = 2.3 V 20 60 140 Ω
V
I
= 2.4 V
(4)
I
O
= 15 mA EN = 3 V 20 60 140 Ω
R
ON
(2)
On-state resistance
SCLn, SDAn (-40 to
125C)
V
I
= 0 V
(3)
I
O
= 64 mA EN = 4.5 V 3.5 5.5 Ω
V
I
= 0 V
(3)
I
O
= 64 mA EN = 3 V 4.7 7 Ω
V
I
= 0 V
(3)
I
O
= 64 mA EN = 2.3 V 6.3 9.5 Ω
V
I
= 0 V
(3)
I
O
= 15 mA EN = 1.5 V 25.5 32 Ω
V
I
= 2.4 V
(4)
I
O
= 15 mA EN = 4.5 V 1 6 15 Ω
V
I
= 2.4 V
(4)
I
O
= 15 mA EN = 3 V 20 60 140 Ω
V
I
= 1.7 V
(4)
I
O
= 15 mA EN = 2.3 V 20 60 140 Ω
www.ti.com
TCA39306-Q1
SCPS239 – JUNE 2021
ADVANCE INFORMATION
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
5
Product Folder Links: TCA39306-Q1
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