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I2C HUB. PCA9518 Datasheet

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I2C HUB. PCA9518 Datasheet






PCA9518 HUB. Datasheet pdf. Equivalent




PCA9518 HUB. Datasheet pdf. Equivalent





Part

PCA9518

Description

Expandable Five-Channel I2C HUB



Feature


Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9518 SCPS132C – JUNE 20 06 – REVISED JUNE 2014 PCA9518 Expand able Five-Channel I2C HUB 1 Features 1 Expandable Five-Channel Bidirection al Buffer • 400-kHz Fast I2C Bus • Operating VCC Range of 3 V to 3.6 V • 5-V Tolerant I2C and Enable Input Pins to Support Mixed-Mode Signal .
Manufacture

Texas Instruments

Datasheet
Download PCA9518 Datasheet


Texas Instruments PCA9518

PCA9518; Operation • Active-High Individual Rep eater Enable Inputs • Open-Drain Inpu t/Outputs • Lockup-Free Operation • Supports Multiple Masters • Powered- Off High-Impedance I2C Pins • I2C Bus and SMBus Compatible • Latchup Perfo rmance Exceeds 100 mA Per JESD 78 • E SD Protection Exceeds JESD 22 – 2000- V Human-Body Model (A114-A) – 200-V M achine Model (A115-A) – 1000-V Charged.


Texas Instruments PCA9518

-Device Model (C101) 2 Description The PCA9518 is an expandable five-channel b idirectional buffer for I2C and SMBus a pplications. The I2C protocol requires a maximum bus capacitance of 400 pF, wh ich is derived from the number of devic es on the I2C bus and the bus length. T he PCA9518 overcomes this restriction b y separating and buffering the I2C data (SDA) and clock (.


Texas Instruments PCA9518

SCL) lines into multiple groups of 400-p F segments. Any segment-to-segment tran sition sees only one repeater delay. Ea ch PCA9518 can communicate with other P CA9518 hubs through a 4wire inter-hub e xpansion bus. Using multiple PCA9518 pa rts, any width hub (in multiples of fiv e) can be implemented using the expansi on pins, with only one repeater delay a nd no functional d.

Part

PCA9518

Description

Expandable Five-Channel I2C HUB



Feature


Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9518 SCPS132C – JUNE 20 06 – REVISED JUNE 2014 PCA9518 Expand able Five-Channel I2C HUB 1 Features 1 Expandable Five-Channel Bidirection al Buffer • 400-kHz Fast I2C Bus • Operating VCC Range of 3 V to 3.6 V • 5-V Tolerant I2C and Enable Input Pins to Support Mixed-Mode Signal .
Manufacture

Texas Instruments

Datasheet
Download PCA9518 Datasheet




 PCA9518
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
PCA9518
SCPS132C – JUNE 2006 – REVISED JUNE 2014
PCA9518 Expandable Five-Channel I2C HUB
1 Features
1 Expandable Five-Channel Bidirectional Buffer
• 400-kHz Fast I2C Bus
• Operating VCC Range of 3 V to 3.6 V
• 5-V Tolerant I2C and Enable Input Pins to Support
Mixed-Mode Signal Operation
• Active-High Individual Repeater Enable Inputs
• Open-Drain Input/Outputs
• Lockup-Free Operation
• Supports Multiple Masters
• Powered-Off High-Impedance I2C Pins
• I2C Bus and SMBus Compatible
• Latchup Performance Exceeds 100 mA Per JESD
78
• 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
The PCA9518 is an expandable five-channel
bidirectional buffer for I2C and SMBus applications.
The I2C protocol requires a maximum bus
capacitance of 400 pF, which is derived from the
number of devices on the I2C bus and the bus length.
The PCA9518 overcomes this restriction by
separating and buffering the I2C data (SDA) and
clock (SCL) lines into multiple groups of 400-pF
segments. Any segment-to-segment transition sees
only one repeater delay. Each PCA9518 can
communicate with other PCA9518 hubs through a 4-
wire inter-hub expansion bus. Using multiple
PCA9518 parts, any width hub (in multiples of five)
can be implemented using the expansion pins, with
only one repeater delay and no functional
degradation of the system performance.
The PCA9518 does not support clock stretching
across the repeater.
PART NUMBER
PCA9518
Device Information(1)
PACKAGE
BODY SIZE (NOM)
SSOP (20)
7.20 mm × 5.30 mm
SOIC (20)
12.80 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
DB, DBQ, DW, OR PW PACKAGE
(TOP VIEW)
EXPSCL1
EXPSCL2
SCL0
SDA0
SCL1
SDA1
EN1
SCL2
SDA2
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 EXPSDA2
18 EXPSDA1
17 EN4
16 SDA4
15 SCL4
14 EN3
13 SDA3
12 SCL3
11 EN2
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.




 PCA9518
PCA9518
SCPS132C – JUNE 2006 – 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......................................................... 5
6.1 Absolute Maximum Ratings .................................... 5
6.2 Handling Ratings ...................................................... 5
6.3 Recommended Operating Conditions....................... 6
6.4 Electrical Characteristics........................................... 6
6.5 Timing Requirements............................................... 7
6.6 Switching Characteristics......................................... 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........................................ 11
9 Application and Implementation ........................ 12
9.1 Typical Application ................................................. 12
10 Device and Documentation Support ................. 14
10.1 Trademarks ........................................................... 14
10.2 Electrostatic Discharge Caution ............................ 14
10.3 Glossary ................................................................ 14
11 Mechanical, Packaging, and Orderable
Information ........................................................... 14
3 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (October 2010) to Revision C
Page
• Added Clock Stretching Errata section................................................................................................................................. 10
Changes from Revision A (June 2010) to Revision B
Page
• Deleted any references to clock stretching in the data sheet. This does not effect min/max specifications. ........................ 1
2 Submit Documentation Feedback
Product Folder Links: PCA9518
Copyright © 2006–2014, Texas Instruments Incorporated




 PCA9518
www.ti.com
PCA9518
SCPS132C – JUNE 2006 – REVISED JUNE 2014
4 Description (Continued)
The device is designed for 3-V to 3.6-V VCC operation, but it has 5-V tolerant I2C and enable (EN) input pins.
This feature allows for translation from 3 V to 5 V between a master and slave. The enable pin also can be used
to electrically isolate a repeater segment from the I2C bus. This is useful in cases where one segment needs to
run at 100 kHz while the rest of the system is at 400 kHz. If the master is running at 400 kHz, the maximum
system operating frequency may be less than 400 kHz, because of the delays added by the repeater.
The output low levels for each internal buffer are approximately 0.5 V, but the input voltage of each internal
buffer must be 70 mV or more below the output low level, when the output internally is driven low. This prevents
a lockup condition from occurring when the input low condition is released.
A PCA9518 cluster cannot be put in series with a repeater such as the PCA9515 or another PCA9518 cluster, as
the design does not allow this configuration. Multiple PCA9518 devices can be grouped with other PCA9518
devices into any size cluster using the EXPxxxx pins that allow the I2C signals to be sent or received from one
PCA9518 to another PCA9518 within the cluster. Because there is no direction pin, slightly different valid low
voltage levels are used to avoid lockup conditions between the input and the output of individual repeaters in the
cluster. A valid low applied at the input of any of the PCA9518 devices is propagated as a buffered low, with a
slightly higher value, to all enabled outputs in the PCA9518 cluster. When this buffered low is applied to another
repeater or separate PCA9518 cluster (not connected via the EXPxxxx pins) in series, the second repeater or
PCA9518 cluster does not recognize it as a regular low and does not propagate it as a buffered low again. For
this reason, the PCA9518 should not be put in series with other repeater or PCA9518 clusters.
The PCA9518 has five multidirectional open-drain buffers designed to support the standard low-level-contention
arbitration of the I2C bus. Except during arbitration, the PCA9518 acts like a pair of noninverting open-drain
buffers, one for SDA and one for SCL.
There is an internal power-on-reset circuit (VPOR) that allows for an initial condition and the ramping of VCC to set
the internal logic.
As with the standard I2C system, pullup resistors are required on each SDAn and SCLn to provide the logic high
levels on the buffered bus. The size of these pullup resistors depends on the system, but it is essential that each
side of the repeater 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.
Copyright © 2006–2014, Texas Instruments Incorporated
Product Folder Links: PCA9518
Submit Documentation Feedback
3



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