PCA9306
SCPS113N – OCTOBER 2004 – REVISED OCTOBER 2021
PCA9306 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
1 Features
2 Applications
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2-Bit bidirectional translator for SDA and SCL lines
in mixed-mode I2C Applications
I2C and SMBus compatible
Less than 1.5-ns maximum propagation delay to
accommodate standard-mode and fast-mode I2C
devices and multiple controllers
Allows voltage-level translation between
– 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V,
or 5-V VREF2
– 1.8-V VREF1 and 2.5-V, 3.3-V, or 5-V VREF2
– 2.5-V VREF1 and 3.3-V or 5-V VREF2
– 3.3-V VREF1 and 5-V VREF2
Provides bidirectional voltage translation with no
direction pin
Low 3.5-Ω ON-state resistance between input and
output ports provides less signal distortion
Open-drain I2C I/O ports (SCL1, SDA1, SCL2, and
SDA2)
5-V Tolerant I2C 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-circuitboard trace routing
Latch-up performance exceeds 100 mA Per JESD
78, class II
ESD protection exceeds JESD 22
– 2000-V Human-body model (A114-A)
– 1000-V Charged-device model (C101)
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I2C, 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 PCA9306 device is a dual bidirectional I2C and
SMBus voltage-level translator with an enable (EN)
input, and is operational from 1.2-V to 3.3-V VREF1
and 1.8-V to 5.5-V VREF2.
The PCA9306 device allows bidirectional voltage
translations between 1.2 V and 5 V, without the use
of a direction pin. The low ON-state resistance (RON)
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 PCA9306 device
can be used to isolate a 400-kHz bus from a 100-kHz
bus by controlling the EN pin to disconnect the slower
bus during fast-mode communication.
Device Information
PART NUMBER
PCA9306
(1)
PACKAGE(1)
BODY SIZE (NOM)
SSOP (8)
2.95 mm x 2.80 mm
VSSOP (8)
2.30 mm x 2.00 mm
X2SON (8)
1.40 mm x 1.00 mm
DSBGA (8)
1.98 mm x 0.98 mm
For all available packages, see the orderable addendum at
the end of the datasheet.
200 NŸ
VREF2
VREF1
EN
PCA9306
I2C or SMBus
controller
(processor)
SCL1
SCL2
SDA1
SDA2
I2C target devices
GND
Simplified Application Diagram
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. PRODUCTION DATA.
PCA9306
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SCPS113N – OCTOBER 2004 – REVISED OCTOBER 2021
Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................4
6 Specifications.................................................................. 5
6.1 Absolute Maximum Ratings........................................ 5
6.2 ESD Ratings............................................................... 5
6.3 Recommended Operating Conditions.........................5
6.4 Thermal Information....................................................6
6.5 Electrical Characteristics.............................................6
6.6 Switching Characteristics AC Performance
(Translating Down) (EN = 3.3 V)................................... 7
6.7 Switching Characteristics AC Performance
(Translating Down) (EN = 2.5 V)................................... 7
6.8 Switching Characteristics AC Performance
(Translating Up) (EN = 3.3 V)........................................7
6.9 Switching Characteristics AC Performance
(Translating Up) (EN = 2.5 V)........................................7
6.10 Typical Characteristics.............................................. 8
7 Parameter Measurement Information............................ 9
8 Detailed Description......................................................10
8.1 Overview................................................................... 10
8.2 Functional Block Diagram......................................... 15
8.3 Feature Description...................................................15
8.4 Device Functional Modes..........................................15
9 Application and Implementation.................................. 16
9.1 Application Information............................................. 16
9.2 Typical Application.................................................... 16
10 Power Supply Recommendations..............................20
11 Layout........................................................................... 21
11.1 Layout Guidelines................................................... 21
11.2 Layout Example...................................................... 21
12 Device and Documentation Support..........................22
12.1 Receiving Notification of Documentation Updates..22
12.2 Support Resources................................................. 22
12.3 Trademarks............................................................. 22
12.4 Electrostatic Discharge Caution..............................22
12.5 Glossary..................................................................22
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision M (April 2019) to Revision N (October 2021)
Page
• Globally changed instances of legacy terminology to controller and target where I2C is mentioned................. 1
• Changed the Thermal Information table values for the DCT and DCU packages.............................................. 6
• Changed the MIN and MAX values of VIK in the Electrical Characteristics table............................................... 6
• Changed tPHL to show the package values in the Switching Characteristics AC Performance (Translating
Down) (EN = 3.3 V) table....................................................................................................................................7
• Changed tPHL to show the package values in the Switching Characteristics AC Performance (Translating
Down) (EN = 2.5 V) table....................................................................................................................................7
• Changed tPHL to show the package values in the Switching Characteristics AC Performance (Translating Up)
(EN = 3.3 V) table............................................................................................................................................... 7
• Changed tPHL to show the package values in the Switching Characteristics AC Performance (Translating Up)
(EN = 2.5 V) table............................................................................................................................................... 7
Changes from Revision L (April 2016) to Revision M (April 2019)
Page
• Changed the DQE package family From: VSSON to X2SON............................................................................ 4
• Added new section to Overview ...................................................................................................................... 10
• Changed the labels in Figure 9-4. The red curve is > 2 V, the black curve is ≤ 2 V. ........................................19
Changes from Revision K (October 2014) to Revision L (April 2016)
Page
• Changed "ON-State Connection " to "ON-state Resistance"..............................................................................1
• Deleted machine model ESD rating ...................................................................................................................1
• Added "bus" following "100-kHz" in the last sentence of the Description section...............................................1
• Changed body-size dimensions in the Device Information table ....................................................................... 1
• Replaced pinout diagrams.................................................................................................................................. 4
• Added I/O column to the Pin Functions table .................................................................................................... 4
• Deleted RVH package from Pin Configuration and Functions section .............................................................. 4
• Moved Tstg from Handling Ratings to Absolute Maximum Ratings ....................................................................5
• Added a note following the Electrical Characteristics table................................................................................ 6
• Added Figure 7-1 to the Parameter Measurement Information section..............................................................9
2
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SCPS113N – OCTOBER 2004 – REVISED OCTOBER 2021
Changed Figure 7-2 ...........................................................................................................................................9
Changed "repeater" to "level shifter" in second paragraph of the Overview section ....................................... 10
Deleted the last row of the Design Requirements table. ..................................................................................17
Corrected equation from fknee= 0.5 / RT (10%–80%) to fknee= 0.5 / RT (10%–90%)........................................ 18
Changes from Revision J (October 2010) to Revision K (December 2012)
Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ............................................................................................................................................................... 1
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5 Pin Configuration and Functions
GND
GND
1
8
EN
2
7
V
1
8
EN
2
7
V
SCL1
3
6
SCL2
SDA1
4
5
SDA2
V
V
REF1
REF2
SCL1
3
6
SCL2
SDA1
4
5
SDA2
REF1
REF2
Figure 5-2. DCU Package 8-Pin VSSOP Top View
Figure 5-1. DCT Package 8-Pin SSOP Top View
A
GND
1
8
EN
2
7
V
SCL1
3
6
SCL2
SDA1
4
5
SDA2
V
REF1
REF2
1
2
GND
EN
B
Figure 5-3. DQE Package 8-Pin X2SON Top View
V
REF1
!
V
REF2
C
SCL1
SCL2
D
SDA1
SDA2
!
Figure 5-4. YZT Package 8-Pin DSBGA Top View
Table 5-1. Pin Functions
PIN
NO.
4
I/O
DESCRIPTION
DCT,
DCU,
DQE
YZT
EN
8
A2
I
GND
1
A1
—
Ground, 0 V
SCL1
3
C1
I/O
Serial clock, low-voltage side
SCL2
6
C2
I/O
Serial clock, high-voltage side
SDA1
4
D1
I/O
Serial data, low-voltage side
SDA2
5
D2
I/O
Serial data, high-voltage side
VREF1
2
B1
I
Low-voltage-side reference supply voltage for SCL1 and SDA1
VREF2
7
B2
I
High-voltage-side reference supply voltage for SCL2 and SDA2
NAME
Switch enable input
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6 Specifications
6.1 Absolute Maximum Ratings
over operating ambient temperature range (unless otherwise noted) see (1)
MIN
MAX
VREF1 DC reference voltage range
–0.5
7
V
VREF2 DC reference bias voltage range
–0.5
7
V
–0.5
7
V
Input voltage range(2)
VI
VI/O
Input/output voltage
range(2)
–0.5
Continuous channel current
IIK
Input clamp current
VI < 0
Tj(max) Maximum junction temperature
Tstg
(1)
(2)
Storage temperature range
–65
7
UNIT
V
128
mA
–50
mA
125
°C
150
°C
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute maximum ratings do not imply
functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions.
If briefly operating outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not
sustain damage, but it may not be fully functional. Operating the device in this manner may affect device reliability, functionality,
performance, and shorten the device lifetime.
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
V(ESD)
(1)
(2)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1)
±2000
Charged device model (CDM), per ANSI/ESDA/JEDEC JS-0011, all
pins(2)
±1000
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
MAX
UNIT
VI/O
Input/output voltage
0
5.5
V
VREF1 (1)
Reference voltage
0
5.5
V
(1)
VREF2
SCL1, SDA1, SCL2, SDA2
MIN
Reference voltage
0
5.5
V
EN
Enable input voltage
0
5.5
V
IPASS
Pass switch current
64
mA
TA
Operating ambient temperature
85
°C
(1)
–40
To support translation, VREF1 supports 1.2 V to VREF2 - 0.6 V. VREF2 must be between VREF1 + 0.6 V to 5.5 V. See Section 9.2 for more
information.
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6.4 Thermal Information
PCA9306
THERMAL
RθJA
METRIC(1)
DCU
DQE
YZT
8 PINS
8 PINS
8 PINS
UNIT
254.1
275.5
246.5
125.5
°C/W
RθJC(top) Junction-to-case (top) thermal resistance
148.6
127.1
149.1
1
°C/W
RθJB
Junction-to-board thermal resistance
168.8
186.9
100
62.7
°C/W
ψJT
Junction-to-top characterization parameter
70.1
65.7
17.1
3.4
°C/W
ψJB
Junction-to-board characterization parameter
167.4
185.9
99.8
62.7
°C/W
(1)
Junction-to-ambient thermal resistance
DCT
8 PINS
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Electrical Characteristics
over recommended operating ambient temperature range (unless otherwise noted)
PARAMETER
MIN
-1.2
VIK
Input clamp voltage
II = –18 mA,
EN = 0 V
IIH
Input leakage current
VI = 5 V,
EN = 0 V
Ci (EN)
Input capacitance
Cio(off)
Off capacitance
SCLn, SDAn
VO = 3 V or 0,
EN = 0 V
Cio(on)
On capacitance
SCLn, SDAn
VO = 3 V or 0,
EN = 3 V
VI = 3 V or 0
VI = 0
RON (2)
(1)
(2)
(3)
6
TEST CONDITIONS
On-state resistance
SCLn, SDAn
VI = 0
TYP(1)
MAX
0
V
5
μA
11
IO = 64 mA
IO = 15 mA
VI = 2.4 V(3)
IO = 15 mA
VI = 1.7 V(3)
IO = 15 mA
pF
4
6
pF
pF
10.5
12.5
EN = 4.5 V
3.5
5.5
EN = 3 V
4.7
7
EN = 2.3 V
6.3
9.5
EN = 1.5 V
25.5
32
1
6
15
EN = 3 V
20
60
140
EN = 2.3 V
20
60
140
EN = 4.5 V
UNIT
Ω
All typical values are at TA = 25°C.
Measured by the voltage drop between the SCL1 and SCL2, or SDA1 and SDA2 terminals, at the indicated current through the switch.
Minimum ON-state resistance is determined by the lowest voltage of the two terminals.
Measured in current sink configuration only (See Figure 7-1)
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6.6 Switching Characteristics AC Performance (Translating Down) (EN = 3.3 V)
over recommended operating ambient temperature range, EN = 3.3 V, VIH = 3.3 V, VIL = 0, VM = 1.15 V (unless otherwise
noted) (see Figure 7-1).
PARAMETER(1)
FROM
(INPUT)
TO
(OUTPUT)
Package
SCL1 or SDA1
YZT, DQE
tPLH
tPHL
(1)
CL = 50 pF
MIN MAX
0
SCL2 or SDA2
DCU, DCT
0
0.8
1.2
CL = 30 pF
MIN MAX
0
0.6
0
1
CL = 15 pF
MIN MAX
0
0
UNIT
0.3
0.5
ns
0.75
Translating down: the high-voltage side driving toward the low-voltage side
6.7 Switching Characteristics AC Performance (Translating Down) (EN = 2.5 V)
over recommended operating ambient temperature range, EN = 2.5 V, VIH = 3.3 V, VIL = 0, VM = 0.75 V (unless otherwise
noted) (see Figure 7-1).
PARAMETER(1)
FROM
(INPUT)
TO
(OUTPUT)
Package
tPLH
tPHL
(1)
SCL2 or SDA2
SCL1 or SDA1
YZT, DQE
DCT, DCU
CL = 50 pF
MIN MAX
CL = 30 pF
MIN MAX
CL = 15 pF
MIN MAX
0
1
0
0.7
0
0
1.3
0
1
0
UNIT
0.4
0.6
ns
0.75
Translating down: the high-voltage side driving toward the low-voltage side
6.8 Switching Characteristics AC Performance (Translating Up) (EN = 3.3 V)
over recommended operating ambient temperature range, EN = 3.3 V, VIH = 2.3 V, VIL = 0, VT = 3.3 V, VM = 1.15 V, RL = 300
Ω (unless otherwise noted) (see Figure 7-1).
PARAMETER(1)
FROM
(INPUT)
TO
(OUTPUT)
Packages
tPLH
tPHL
(1)
CL = 50 pF
MIN MAX
0
SCL1 or SDA1
SCL2 or SDA2
YZT, DQE
DCU, DCT
0
0.9
1.4
1.7
CL = 30 pF
MIN MAX
0
0
0.6
1.1
1.4
CL = 15 pF
MIN MAX
0
0
UNIT
0.4
0.7
ns
1.0
Translating up: the low-voltage side driving toward the high-voltage side
6.9 Switching Characteristics AC Performance (Translating Up) (EN = 2.5 V)
over recommended operating ambient temperature range, EN = 2.5 V, VIH = 2.3 V, VIL = 0, VT = 3.3 V, VM = 0.75 V, RL = 300
Ω (unless otherwise noted) (see Figure 7-1).
PARAMETER(1)
FROM
(INPUT)
TO
(OUTPUT)
Packages
SCL1 or SDA1
SCL2 or SDA2
YZT, DQE
tPLH
tPHL
(1)
CL = 50 pF
MIN MAX
0
DCT, DCU
0
1
1.3
2.1
CL = 30 pF
MIN MAX
0
0
0.6
1.3
1.7
CL = 15 pF
MIN MAX
0
0
UNIT
0.4
0.8
ns
1.3
Translating up: the low-voltage side driving toward the high-voltage side
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6.10 Typical Characteristics
100
300
25qC (Room Temp.)
85qC
-40qC
90
250
80
70
RON (:)
RON (:)
200
150
100
60
50
40
30
20
25qC (Room Temp.)
85qC
-40qC
50
10
0
0
0
0.5
1
1.5
2
2.5
3
VSDA1 or VSCL1 (V)
VEN = 1.5 V
3.5
4
4.5
0
0.5
1
D001
II = 15 mA
1.5
2
2.5
3
VSDA1 or VSCL1 (V)
VEN = 4.5 V
Figure 6-1. On-Resistance (RON) vs Input Voltage (VSDA1 or
VSCL1)
3.5
4
4.5
D001
II = 15 mA
Figure 6-2. On-Resistance (RON) vs Input Voltage (VSDA1 or
VSCL1)
0
Bandwidth (dB)
-2
-4
-6
-8
-10
100x103
1x106
10x106
Frequency (Hz)
100x106
VEN = 2.5 V
1x109
D001
VBIAS = GND
Figure 6-3. Typical Bandwidth of PCA9306
8
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7 Parameter Measurement Information
VEN
VEN
IO
Source
Current
VI + IO*RON
VI
VI - IO*RON
VI
a) Current Source Configuration
IO
Sink
Current
b) Current Sink Configuration
Figure 7-1. Current Source and Current Sink Configurations for RON Measurements
SWITCH
USAGE
S1
Translating up
S2
Translating down
VT
RL
S1
VIH
Open
From Output
under Test
VM
S2
VM
Input
CL
(see Note A)
VIL
tPLH
VOH
VM
Load Circuit
tPHL
Output
VM
VOL
NOTES: A. CL includes probe and jig capacitance
B. All input pulses are supplied by generators having the following characteristics: WZZ G 10 MHz, ZO = 50 Q , tr G 2 ns, tf G 2 ns.
C. The outputs are measured one at a time, with one transition per measurement.
Figure 7-2. Load Circuit for Outputs
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8 Detailed Description
8.1 Overview
The PCA9306 device is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input
and operates without use of a direction pin. The voltage supply range for VREF1 is 1.2 V to 3.3 V and the supply
range for VREF2 is 1.8 V to 5.5 V.
The PCA9306 device can also be used to run two buses, one at 400-kHz operating frequency and the other at
100-kHz operating frequency. If the two buses are operating at different frequencies, the 100-kHz bus must be
disconnected by using the EN pin when the 400-kHz operation of the main bus is required. If the controller is
running at 400 kHz, the maximum system operating frequency may be less than 400 kHz because of the delays
added by the level shifter.
In I2C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. The
capacitive load on both sides of the PCA9306 device must be taken into account when approximating the total
load of the system, ensuring the sum of both sides is under 400 pF.
Both the SDA and SCL channels of the PCA9306 device 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 discretetransistor voltage-translation solutions, because the fabrication of the switch is symmetrical. The translator
provides excellent ESD protection to lower-voltage devices and at the same time protects less-ESD-resistant
devices.
8.1.1 Definition of threshold voltage
This document references a threshold voltage denoted as Vth, which appears multiple times throughout this
document when discussing the NFET between VREF1 and VREF2. The value of Vth is approximately 0.6 V at room
temperature.
8.1.2 Correct Device Set Up
In a normal set up shown in Figure 8-1, the enable pin and VREF2 are shorted together and tied to a 200-kΩ
resistor, and a reference voltage equal to VREF1 plus the FET threshold voltage is established. This reference
voltage is used to help pass lows from one side to another more effectively while still separating the different pull
up voltages on both sides.
VCC2 = +3.3 V
Normal Setup
VCC1 < VCC2
200 kŸ
VCC1 = +1.8 V
EN
+1.8 V + VTH
RPU
RPU
RPU
RPU
+
Vgs
VREF1
-
VREF2
IREF2 = 4 µA
SDA1
SDA2
SCL1
SCL2
Figure 8-1. Normal Setup
Care should be taken to ensure VREF2 has an external resistor tied between it and VCC2. If VREF2 is tied
directly to the VCC2 rail without a resistor, then there is no external resistance from the VCC2 to VCC1 to limit
the current such as in Figure 8-2. This effectively looks like a low impedance path for current to travel through
and potentially break the pass FET if the current flowing through the pass FET is larger than the absolute
10
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maximum continuous channel current specified in section 6.1. The continuous channel current is larger with a
higher voltage difference between VCC1 and VCC2.
Figure 8-2 shows an improper set up. If VCC2 is larger than VCC1 but less than Vth, the impedance between VCC1
and VCC2 is high resulting in a low drain to source current, which does not cause damage to the device. Concern
arises when VCC2 becomes larger than VCC1 by Vth. During this event, the NFET turns on and begin to conduct
current. This current is dependent on the gate to source voltage and drain to source voltage.
VCC2 = +3.3 V
Abnormal Setup
VCC1 < VCC2
200k Ÿ
VCC1 = +1.8 V
EN
RPU
RPU
RPU
RPU
+
Vgs
VREF1
-
VREF2
SDA1
SDA2
SCL1
SCL2
Figure 8-2. Abnormal Setup
8.1.3 Disconnecting an I2C target from the Main I2C Bus Using the EN Pin
PCA9306 can be used as a switch to disconnect one side of the device from the main I2C bus. This can be
advantageous in multiple situations. One instance of this situation is if there are devices on the I2C bus which
only supports fast mode (400 kHz) while other devices on the bus support fast mode plus (1 MHz). An example
of this is displayed in Figure 8-3.
3.3 V I2C bus
(1 MHz)
PCA9306
EN
3.3 V I2C bus
(400 kHz)
GPIO
Note: GPIO logic high must not
exceed 3.3 V +Vth in this example
Figure 8-3. Example of an I2C bus with multiple supported frequencies
In this situation, if the controller is on the 1 MHz side then communicating at 1 MHz should not be attempted
if PCA9306 were enabled. It needs to be disabled for PCA9306 to avoid possibly glitching state machines
in devices which were designed to operate correctly at 400 kHz or slower. When PCA9306 is disabled, the
controller can communicate with the 1 MHz devices without disturbing the 400 kHz bus. When the PCA9306 is
enabled, communication across both sides at 400 kHz is acceptable.
8.1.4 Supporting Remote Board Insertion to Backplane with PCA9306
Another situation where PCA9306 is advantageous when using its enable feature is when a remote board with
I2C lines needs to be attached to a main board (backplane) with an I2C bus such as in Figure 8-4. If connecting
a remote board to a backplane is not done properly, the connection could result in data corruption during a
transaction or the insertion could generate an unintended pulse on the SCL line. Which could glitch an I2C
device state machine causing the I2C bus to get stuck.
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Main Board
3.3 V I2C bus
Remote Board
3.3 V I2C bus
PCA9306
EN
GPIO
Note: GPIO logic high must not
exceed 3.3 V +Vth in this example
Figure 8-4. An example of connecting a remote board to a main board (backplane)
PCA9306 can be used to support this application because it can be disabled while making the connection. Then
it is enabled once the remote board is powered on and the buses on both sides are IDLE.
8.1.5 Switch Configuration
PCA9306 has the capability of being used with its VREF1 voltage equal to VREF2. This essentially turns the device
from a translator to a device which can be used as a switch, and in some situations this can be useful. The
switch configuration is shown in Figure 8-5 and translation mode is shown in Figure 8-6.
VCC2
GPIO: high logic does not
exceed Vref2 + Vth
VCC1
200 k
Where Vcc2 = Vcc1
VCC1 VCC1
R
Vref1
Vref2
VCC2 VCC2
EN
R
R
PCA9306
SCL1
SCL2
SDA1
SDA2
Switch Configuration: Vref1 = Vref2 and
Enable is controlled by a GPIO
Figure 8-5. Switch Configuration
VCC2
VCC1
200 k
VCC1 VCC1
R
Vref1
Vref2
VCC2 VCC2
EN
R
R
PCA9306
SCL1
SCL2
SDA1
SDA2
Translation Configuration
where Vcc2 >= Vref1 + 0.7 V
Figure 8-6. Translation Configuration
When PCA9306 is in the switch configuration (VREF1 = VREF2), the propagation delays are different compared
to the translator configuration. Taking a look at the propagation delays, if the pull up resistance and capacitance
on both sides of the bus are equal, then in switch mode the PCA9306 has the same propagation delay from
side one to two and side two to one. The propagation delays become lower when VCC1/VCC2 is larger. For
12
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example, the propagation delay at 1.8 V is longer than at 5 V in the switching configuration. When PCA9306 is
in translation mode, side one propagate lows to side two faster than side two can propagate lows to side 1. This
time difference becomes larger the larger the difference between VCC2 and VCC1 becomes.
8.1.6 Controller on Side 1 or Side 2 of Device
I2C and SMBus are bidirectional protocol meaning devices on the bus can both transmit and receive data.
PCA9306 was designed to allow for signals to be able to be transmitted from either side, thus allowing for the
controller to be able to placed on either side of the device. Figure 8-7 shows the controller on side two as
opposed to the diagram on page 1 of this data sheet.
VCC2
VCC1
200 k
Vref1
Vref2
EN
PCA9306
SCL1
SCL2
SDA1
SDA2
I2C or SMBus
controller (processor)
I2C target devices
Figure 8-7. Controller on side 2 of PCA9306
8.1.7 LDO and PCA9306 Concerns
The VREF1 pin can be supplied by a low-dropout regulator (LDO), but in some cases the LDO may lose its
regulation because of the bias current from VREF2 to VREF1. If the LDO cannot sink the bias current, then the
current has no other paths to ground and instead charges up the capacitance on the VREF1 node (both external
and parasitic). This results in an increase in voltage on the VREF1 node. If no other paths for current to flow are
established (such as back biasing of body diodes or clamping diodes through other devices on the VREF1 node),
then the VREF1 voltage ends up stabilizing when Vgs of the pass FET is equal to Vth. This means VREF1 node
voltage is VCC2 - Vth. Note that any targets/controllers running off of the LDO now see the VCC2 - Vth voltage
which may cause damage to those targets/controllers if they are not rated to handle the increased voltage.
Translator Setup with Vref1
provided by LDO and no path
for bias current
VCC2 = +3.3 V
200 kŸ
VCC1 < VCC2
EN
Ven = Vref1 + VTH
PCA9306
LDO
Vout
+
+
Vgs
VREF1 = Vcc2 - Vth
VREF1
pin
VREF2
pin
Ibias = (Vcc2 ± Ven) / 200 k
CREF1
Figure 8-8. Example of no leakage current path when using LDO
To make sure the LDO does not lose regulation due to the bias current of PCA9306, a weak pull down resistor
can be placed on VREF1 to ground to provide a path for the bias current to travel. The recommended pull down
resistor is calculated by Equation 4 where 0.75 gives about 25% margin for error incase bias current increases
during operation.
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VCC2 = +3.3 V
Translator Setup
200 kŸ
VCC1 < VCC2
EN
Ven = Vref1 + VTH
PCA9306
LDO
Vgs
-
Vout = +1.8 V
+
VREF1
VREF2
Rpulldown
CREF1
Ibias = (Vcc2 ± Ven) / 200 k
Figure 8-9. Example with Leakage current path when using an LDO
Ven = VREF1 + Vth
(1)
where
•
Vth is approximately 0.6 V
Ibias = (VCC2 - Ven)/200k
(2)
Rpulldown = VOUT/Ibias
(3)
Recommended Rpulldown = Rpulldown x 0.75
(4)
8.1.8 Current Limiting Resistance on VREF2
The resistor is used to limit the current between VREF2 and VREF1 (denoted as RCC) and helps to establish the
reference voltage on the enable pin. The 200k resistor can be changed to a lower value; however, the bias
current proportionally increases as the resistor decreases.
Ibias = (VCC2 - Ven)/RCC : Ven = VREF1 + Vth
(5)
where
•
Vth is approximately 0.6V
Keep in mind RCC should not be sized low enough that ICC exceeds the absolute maximum continuous channel
current specified in section 6.1 which is described in Equation 6.
RCC(min) ≥ (VCC2 - Ven)/0.128 : Ven = VREF1 + Vth
(6)
where
•
14
Vth is approximately 0.6V
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8.2 Functional Block Diagram
Figure 8-10. Block Diagram of PCA9306
8.3 Feature Description
8.3.1 Enable (EN) Pin
The PCA9306 device is a double-pole, single-throw switch in which the gate of the transistors is controlled by the
voltage on the EN pin. In Figure 9-1, the PCA9306 device is always enabled when power is applied to VREF2. In
Figure 9-2, the device is enabled when a control signal from a processor is in a logic-high state.
8.3.2 Voltage Translation
The primary feature of the PCA9306 device is translating voltage from an I2C bus referenced to VREF1 up to
an I2C bus referenced to VDPU, to which VREF2 is connected through a 200-kΩ pullup resistor. Translation on a
standard, open-drain I2C bus is achieved by simply connecting pullup resistors from SCL1 and SDA1 to VREF1
and connecting pullup resistors from SCL2 and SDA2 to VDPU. Information on sizing the pullup resistors can be
found in the Sizing Pullup Resistors section.
8.4 Device Functional Modes
(1)
INPUT
EN(1)
TRANSLATOR FUNCTION
H
Logic Lows are propagated from one side to the other, Logic Highs blocked (independent
pull up resistors passively drive the line high)
L
Disconnect
The SCL switch conducts if EN is ≥ 0.6 V higher than SCL1 or SCL2. The same is true of SDA.
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9 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification,
and TI does not warrant its accuracy or completeness. TI’s customers are responsible for
determining suitability of components for their purposes, as well as validating and testing their design
implementation to confirm system functionality.
9.1 Application Information
9.1.1 General Applications of I2C
As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the translator
bus. The size of these pullup resistors depends on the system, but each side of the repeater must have a pullup
resistor. The device is designed to work with standard-mode and fast-mode I2C devices in addition to SMBus
devices. Standard-mode I2C devices only specify 3 mA in a generic I2C system where standard-mode devices
and multiple controllers are possible. Under certain conditions, high termination currents can be used. When
the SDA1 or SDA2 port is low, the clamp is in the ON state, and a low-resistance connection exists between
the SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port when the SDA2 port is high,
the voltage on the SDA1 port is limited to the voltage set by VREF1. When the SDA1 port is high, the SDA2
port is pulled to the pullup supply voltage of the drain (VDPU) by the pullup resistors. This functionality allows a
seamless translation between higher and lower voltages selected by the user, without the need for directional
control. The SCL1-SCL2 channel also functions in the same way as the SDA1-SDA2 channel.
9.2 Typical Application
Figure 9-1 and Figure 9-2 show how these pullup resistors are connected in a typical application, as well as two
options for connecting the EN pin.
VDPU = 3.3 V
200 kΩ
PCA9306
VREF1 = 1.8 V
EN 8
RPU
2
VREF1
RPU
VCC
VREF2
RPU
3
SCL
RPU
7
SCL1
SCL2
VCC
6
SCL
SW
2
I C Bus
Controller
2
I C Bus
Device
4
SDA
GND
SDA2
SDA1
5
SDA
SW
GND
GND
1
Figure 9-1. Typical Application Circuit (Switch Always Enabled)
16
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VDPU = 3.3 V
3.3-V Enable Signal
On
Off
200 k Ω
PCA9306
EN
VREF1 = 1.8 V
RPU
2
VREF2
VREF1
RPU
8
RPU
7
RPU
VCC
3
SCL
SCL1
VCC
SW
SCL2
6
SCL
I2C Bus
Device
I2C Bus
Controller
4
SDA
SDA1
SW
SDA2
5
SDA
GND
GND
GND
1
Figure 9-2. Typical Application Circuit (Switch Enable Control)
9.2.1 Design Requirements
MIN TYP(1)
MAX
UNIT
VREF2
Reference voltage
VREF1 + 0.6
2.1
EN
Enable input voltage
VREF1 + 0.6
VREF1
Reference voltage
1.2
IPASS
Pass switch current
6
mA
IREF
Reference-transistor current
5
μA
(1)
5
V
2.1
5
V
1.5
4.4
V
All typical values are at TA = 25°C.
9.2.2 Detailed Design Procedure
9.2.2.1 Bidirectional Voltage Translation
For the bidirectional clamping configuration (higher voltage to lower voltage or lower voltage to higher voltage),
the EN input must be connected to VREF2 and both pins pulled to high-side VDPU through a pullup resistor
(typically 200 kΩ). This allows VREF2 to regulate the EN input. A 100-pF filter capacitor connected to VREF2 is
recommended. The I2C bus controller output can be push-pull or open-drain (pullup resistors may be required)
and the I2C bus device output can be open-drain (pullup resistors are required to pull the SCL2 and SDA2
outputs to VDPU). However, if either output is push-pull, data must be unidirectional or the outputs must be
3-state capable and be controlled by some direction-control mechanism to prevent high-to-low contentions in
either direction. If both outputs are open-drain, no direction control is needed.
9.2.2.2 Sizing Pullup Resistors
To get an estimate for the range of values that can be used for the pullup resistor, please refer to the application
note SLVA689. Figure 9-3 and Figure 9-4 respectively show the maximum and minimum pullup resistance
allowable by the I2C specification for standard-mode (100 kHz) and fast-mode (400 kHz) operation.
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9.2.2.3 PCA9306 Bandwidth
The maximum frequency of the PCA9306 device depends on the application. The device can operate at speeds
of > 100 MHz given the correct conditions. The maximum frequency is dependent upon the loading of the
application.
Figure 6-3 shows a bandwidth measurement of the PCA9306 device using a two-port network analyzer.
However, this is an analog type of measurement. For digital applications, the signal should not degrade up to the
fifth harmonic of the digital signal. As a rule of thumb, the frequency bandwidth should be at least five times the
maximum digital clock rate. This component of the signal is very important in determining the overall shape of
the digital signal. In the case of the PCA9306 device, digital clock frequency of >100 MHz can be achieved.
The PCA9306 device does not provide any drive capability like the PCA9515 or PCA9517 series of devices.
Therefore, higher-frequency applications require higher drive strength from the host side. No pullup resistor is
needed on the host side (3.3 V) if the PCA9306 device is being driven by standard CMOS push-pull output
driver. Ideally, it is best to minimize the trace length from the PCA9306 device on the sink side (1.8 V) to
minimize signal degradation.
You can then use a simple formula to compute the maximum practical frequency component or the knee
frequency (fknee). All fast edges have an infinite spectrum of frequency components. However, there is an
inflection (or knee) in the frequency spectrum of fast edges where frequency components higher than fknee are
insignificant in determining the shape of the signal.
To calculate fknee:
fknee= 0.5 / RT (10%–90%)
(7)
fknee = 0.4 / RT (20%–80%)
(8)
For signals with rise-time characteristics based on 10- to 90-percent thresholds, fknee is equal to 0.5 divided by
the rise time of the signal. For signals with rise-time characteristics based on 20- to 80-percent thresholds, which
is very common in many current device specifications, fknee is equal to 0.4 divided by the rise time of the signal.
Some guidelines to follow that help maximize the performance of the device:
• Keep trace length to a minimum by placing the PCA9306 device close to the I2C output of the processor.
• The trace length should be less than half the time of flight to reduce ringing and line reflections or nonmonotonic behavior in the switching region.
• To reduce overshoots, a pullup resistor can be added on the 1.8 V side; be aware that a slower fall time is to
be expected.
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9.2.3 Application Curve
25
Standard-mode
Fast-mode
Rp(max) (kOhm)
20
15
10
5
VDPUX < 2 V
VDPUX > 2 V
0
0
50
100
150
200
250
Cb (pF)
Standard mode
(fSCL = 100 kHz, tr = 1 μs)
300
350
400
450
D008
Fast mode
(fSCL = 400 kHz, tr = 300 ns)
Figure 9-3. Maximum Pullup Resistance (Rp(max))
vs Bus Capacitance (Cb)
VOL = 0.2 x VDPUX , IOL = 2 mA when VDPUX ≤ 2 V
VOL = 0.4 V, IOL = 3 mA when VDPUX > 2 V
Figure 9-4. Minimum Pullup Resistance (Rp(min)) vs
Pullup Reference Voltage (VDPUX)
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10 Power Supply Recommendations
For supplying power to the PCA9306 device, the VREF1 pin can be connected directly to a power supply.
The VREF2 pin must be connected to the VDPU power supply through a 200-kΩ resistor. Failure to have a
high-impedance resistor between VREF2 and VDPU results in excessive current draw and unreliable device
operation. It is also worth noting, that in order to support voltage translation, the PCA9306 must have the EN and
VREF2 pins shorted and then pulled up to VDPU through a high-impedance resistor.
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11 Layout
11.1 Layout Guidelines
For printed-circuit board (PCB) layout of the PCA9306 device, common PCB layout practices should be followed,
but additional concerns related to high-speed data transfer such as matched impedances and differential pairs
are not a concern for I2C signal speeds.
In all PCB layouts, it is a best practice to avoid right angles in signal traces, to fan out signal traces away from
each other on leaving the vicinity of an integrated circuit (IC), and to use thicker trace widths to carry higher
amounts of current that commonly pass through power and ground traces. The 100-pF filter capacitor should be
placed as close to VREF2 as possible. A larger decoupling capacitor can also be used, but a longer time constant
of two capacitors and the 200-kΩ resistor results in longer turnon and turnoff times for the PCA9306 device.
These best practices are shown in Figure 11-1.
For the layout example provided in Figure 11-1, it would be possible to fabricate a PCB with only two layers by
using the top layer for signal routing and the bottom layer as a split plane for power (VCC) and ground (GND).
However, a four-layer board is preferable for boards with higher-density signal routing. On a four-layer PCB,
it is common to route signals on the top and bottom layer, dedicate one internal layer to a ground plane, and
dedicate the other internal layer to a power plane. In a board layout using planes or split planes for power and
ground, vias are placed directly next to the surface-mount component pad, which must attach to VCC or GND,
and the via is connected electrically to the internal layer or the other side of the board. Vias are also used when
a signal trace must be routed to the opposite side of the board, but this technique is not demonstrated in Figure
11-1.
11.2 Layout Example
Figure 11-1. PCA9306 Layout Example
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12 Device and Documentation Support
12.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.2 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do
not necessarily reflect TI's views; see TI's Terms of Use.
12.3 Trademarks
TI E2E™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
12.4 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled
with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
12.5 Glossary
TI Glossary
This glossary lists and explains terms, acronyms, and definitions.
Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the mostcurrent data available for the designated device. This data is subject to change without notice and without
revision of this document. For browser-based versions of this data sheet, see the left-hand navigation pane.
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PACKAGE OPTION ADDENDUM
www.ti.com
2-Aug-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
PCA9306DCTR
ACTIVE
SM8
DCT
8
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCTRE4
LIFEBUY
SM8
DCT
8
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCTRG4
LIFEBUY
SM8
DCT
8
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCTT
ACTIVE
SM8
DCT
8
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCTTE4
LIFEBUY
SM8
DCT
8
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCTTG4
LIFEBUY
SM8
DCT
8
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BD
(G, S, Y)
PCA9306DCUR
ACTIVE
VSSOP
DCU
8
3000
RoHS & Green
NIPDAU | SN
| NIPDAUAG
Level-1-260C-UNLIM
-40 to 85
(29O4, 7BDP, 7BDS,
7BDY)
Samples
Samples
Samples
PCA9306DCURE4
LIFEBUY
VSSOP
DCU
8
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BDS
PCA9306DCURG4
LIFEBUY
VSSOP
DCU
8
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BDS
PCA9306DCUT
ACTIVE
VSSOP
DCU
8
250
RoHS & Green
NIPDAU | SN
| NIPDAUAG
Level-1-260C-UNLIM
-40 to 85
(29O4, 7BDP, 7BDS,
7BDY)
PCA9306DCUTE4
LIFEBUY
VSSOP
DCU
8
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BDS
PCA9306DCUTG4
LIFEBUY
VSSOP
DCU
8
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
7BDS
PCA9306DQER
ACTIVE
X2SON
DQE
8
5000
RoHS & Green NIPDAU | NIPDAUAG
Level-1-260C-UNLIM
-40 to 85
(3M, 7F)
Samples
PCA9306YZTR
ACTIVE
DSBGA
YZT
8
3000
RoHS & Green
Level-1-260C-UNLIM
-40 to 85
7F
Samples
SNAGCU
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
2-Aug-2022
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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