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Bus Repeater. PCA9517 Datasheet

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Bus Repeater. PCA9517 Datasheet






PCA9517 Repeater. Datasheet pdf. Equivalent




PCA9517 Repeater. Datasheet pdf. Equivalent





Part

PCA9517

Description

Level-Translating I2C Bus Repeater



Feature


Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9517 SCPS157E – DECEMBE R 2007 – REVISED JUNE 2014 PCA9517 Le vel-Translating I2C Bus Repeater Not Re commended for New Designs 1 Features β €’1 Two-Channel Bidirectional Buffer β€ ’ I2C Bus and SMBus Compatible β€’ Oper ating Supply Voltage Range of 0.9 V to 5.5 V on A Side β€’ Operating .
Manufacture

Texas Instruments

Datasheet
Download PCA9517 Datasheet


Texas Instruments PCA9517

PCA9517; Supply Voltage Range of 2.7 V to 5.5 V o n B Side β€’ Voltage-Level Translation From 0.9 V to 5.5 V and 2.7 V to 5.5 V β€’ Footprint and Function Replacement for PCA9515A β€’ Active-High Repeater-E nable Input β€’ Open-Drain I2C I/O β€’ 5.5-V Tolerant I2C and Enable Input Sup port Mixed-Mode Signal Operation β€’ Lo ckup-Free Operation β€’ Accommodates St andard Mode and Fast Mode I2C De.


Texas Instruments PCA9517

vices and Multiple Masters β€’ Powered-O ff High-Impedance I2C Pins β€’ 400-kHz Fast I2C Bus β€’ Latch-Up Performance E xceeds 100 mA Per JESD 78, Class II β€’ ESD Protection Exceeds JESD 22 – 200 0-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Char ged-Device Model (C101) 2 Description This dual bidirectional I2C buffer is o perational at 2.7 V to 5.5 V. Th.


Texas Instruments PCA9517

e PCA9517 is a BiCMOS integrated circuit intended for I2C bus and SMBus systems . It can also provide bidirectional vol tage-level translation (uptranslation/d own-translation) between low voltages ( down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-mode applications . This device enables I2C and similar b us systems to be extended, without degr adation of perform.

Part

PCA9517

Description

Level-Translating I2C Bus Repeater



Feature


Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9517 SCPS157E – DECEMBE R 2007 – REVISED JUNE 2014 PCA9517 Le vel-Translating I2C Bus Repeater Not Re commended for New Designs 1 Features β €’1 Two-Channel Bidirectional Buffer β€ ’ I2C Bus and SMBus Compatible β€’ Oper ating Supply Voltage Range of 0.9 V to 5.5 V on A Side β€’ Operating .
Manufacture

Texas Instruments

Datasheet
Download PCA9517 Datasheet




 PCA9517
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
PCA9517
SCPS157E – DECEMBER 2007 – REVISED JUNE 2014
PCA9517 Level-Translating I2C Bus Repeater
Not Recommended for New Designs
1 Features
β€’1 Two-Channel Bidirectional Buffer
β€’ I2C Bus and SMBus Compatible
β€’ Operating Supply Voltage Range of 0.9 V to 5.5 V
on A Side
β€’ Operating Supply Voltage Range of 2.7 V to 5.5 V
on B Side
β€’ Voltage-Level Translation From 0.9 V to 5.5 V and
2.7 V to 5.5 V
β€’ Footprint and Function Replacement for
PCA9515A
β€’ Active-High Repeater-Enable Input
β€’ Open-Drain I2C I/O
β€’ 5.5-V Tolerant I2C and Enable Input Support
Mixed-Mode Signal Operation
β€’ Lockup-Free Operation
β€’ Accommodates Standard Mode and Fast Mode
I2C Devices and Multiple Masters
β€’ Powered-Off High-Impedance I2C Pins
β€’ 400-kHz Fast I2C Bus
β€’ Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
β€’ ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
2 Description
This dual bidirectional I2C buffer is operational at
2.7 V to 5.5 V.
The PCA9517 is a BiCMOS integrated circuit
intended for I2C bus and SMBus systems. It can also
provide bidirectional voltage-level translation (up-
translation/down-translation) between low voltages
(down to 0.9 V) and higher voltages (2.7 V to 5.5 V)
in mixed-mode applications. This device enables I2C
and similar bus systems to be extended, without
degradation of performance even during level shifting.
The PCA9517 buffers both the serial data (SDA) and
the serial clock (SCL) signals on the I2C bus, thus
allowing two buses of 400-pF bus capacitance to be
connected in an I2C application. This device can also
be used to isolate two halves of a bus for voltage and
capacitance.
The PCA9517 has two types of driversβ€”A-side
drivers and B-side drivers. All inputs and I/Os are
overvoltage tolerant to 5.5 V, even when the device is
unpowered (VCCB and/or VCCA = 0 V).
The PCA9517 doesnot support clock stretching and
arbitration across the repeater.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PCA9517
SOIC (8)
VSSOP (8)
4.90 mm Γ— 3.91 mm
3.00 mm Γ— 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
VCCA
SCLA
SDAA
GND
D PACKAGE
(TOP VIEW)
18
27
36
45
VCCB
SCLB
SDAB
EN
DGK PACKAGE
(TOP VIEW)
VCCA
SCLA
SDAA
GND
1
2
3
4
8 VCCB
7 SCLB
6 SDAB
5 EN
1
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.




 PCA9517
Not Recommended for New Designs
PCA9517
SCPS157E – DECEMBER 2007 – REVISED JUNE 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Description ............................................................. 1
3 Revision History..................................................... 2
4 Description (Continued) ........................................ 3
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 6
6.6 Timing Requirements ................................................ 6
6.7 I2C Interface Timing Requirements........................... 7
7 Parameter Measurement Information .................. 8
8 Detailed Description .............................................. 9
8.1 Functional Block Diagram ......................................... 9
8.2 Feature Description................................................. 10
8.3 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 12
9.1 Typical Application ................................................. 12
10 Device and Documentation Support ................. 15
10.1 Trademarks ........................................................... 15
10.2 Electrostatic Discharge Caution ............................ 15
10.3 Glossary ................................................................ 15
11 Mechanical, Packaging, and Orderable
Information ........................................................... 15
3 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (March 2012) to Revision E
Page
β€’ Added Clock Stretching Errata section. ............................................................................................................................... 10
β€’ Added Load Dependent Undershoot Errata section............................................................................................................. 10
β€’ Added Glitch/Noise Susceptibility Errata section.................................................................................................................. 11
β€’ Added Load Susceptibility Errata section. ............................................................................................................................ 11
Changes from Revision B (May 2010) to Revision C
Page
β€’ Deleted all references to arbitration and clock stretching support. This does not effect min/max specifications. ................ 1
2 Submit Documentation Feedback
Product Folder Links: PCA9517
Copyright Β© 2007–2014, Texas Instruments Incorporated




 PCA9517
Not Recommended for New Designs
www.ti.com
PCA9517
SCPS157E – DECEMBER 2007 – REVISED JUNE 2014
4 Description (Continued)
The B-side drivers operate from 2.7 V to 5.5 V and behave like the drivers in the PCA9515A. The output low
level for this internal buffer is approximately 0.5 V, but the input voltage must be 70 mV or more below the output
low level when the output internally is driven low. The higher-voltage low signal is called a buffered low. When
the B-side I/O is driven low internally, the low is not recognized as a low by the input. This feature prevents a
lockup condition from occurring when the input low condition is released.
This type of design on the B side prevents it from being used in series with the PCA9515A and another
PCA9517 (B side). This is because these devices do not recognize buffered low signals as a valid low and do
not propagate it as a buffered low again.
The A-side drivers operate from 0.9 V to 5.5 V and drive more current. They do not require the buffered low
feature (or the static offset voltage). This means that a low signal on the B side translates to a nearly 0-V low on
the A side, which accommodates smaller voltage swings of lower-voltage logic. The output pulldown on the
A side drives a hard low, and the input level is set at 0.3 VCCA to accommodate the need for a lower low level in
systems where the low-voltage-side supply voltage is as low as 0.9 V.
The A side of two or more PCA9517s can be connected together to allow a star topography, with the A side on
the common bus. Also, the A side can be connected directly to any other buffer with static- or dynamic-offset
voltage. Multiple PCA9517s can be connected in series, A side to B side, with no buildup in offset voltage and
with only time-of-flight delays to consider.
The PCA9517 drivers are enabled when VCCA is above 0.8 V and VCCB is above 2.5 V.
The PCA9517 has an active-high enable (EN) input with an internal pullup to VCCB, which allows the user to
select when the repeater is active. This can be used to isolate a badly behaved slave on power-up reset. It
should never change state during an I2C operation, because disabling during a bus operation hangs the bus, and
enabling part way through a bus cycle could confuse the I2C parts being enabled. The EN input should change
state only when the global bus and repeater port are in an idle state, to prevent system failures.
The PCA9517 includes a power-up circuit that keeps the output drivers turned off until VCCB is above 2.5 V and
the VCCA is above 0.8 V. VCCB and VCCA can be applied in any sequence at power up. After power up and with
the EN high, a low level on the A side (below 0.3 VCCA) turns the corresponding B-side driver (either SDA or
SCL) on and drives the B side down to approximately 0.5 V. When the A side rises above 0.3 VCCA, the B-side
pulldown driver is turned off and the external pullup resistor pulls the pin high. When the B side falls first and
goes below 0.3 VCCB, the A-side driver is turned on and the A side pulls down to 0 V. The B-side pulldown is not
enabled unless the B-side voltage goes below 0.4 V. If the B-side low voltage does not go below 0.5 V, the A-
side driver turns off when the B-side voltage is above 0.7 VCCB. If the B-side low voltage goes below 0.4 V, the B-
side pulldown driver is enabled, and the B side is able to rise to only 0.5 V until the A side rises above 0.3 VCCA.
Then the B side continues to rise, being pulled up by the external pullup resistor. VCCA is only used to provide the
0.3 VCCA reference to the A-side input comparators and for the power-good-detect circuit. The PCA9517 logic
and all I/Os are powered by the VCCB pin.
As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the buffered
bus. The PCA9517 has standard open-collector configuration of the I2C 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 masters are possible.
Under certain conditions, higher termination currents can be used.
Copyright Β© 2007–2014, Texas Instruments Incorporated
Product Folder Links: PCA9517
Submit Documentation Feedback
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