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INTEGRATED CIRCUITS
PCA9515 I2C bus repeater
Product data Supersedes data of 2002 Mar 01 2002 May 13
Philips Semiconductors
Philips Semiconductors
Product data
I2C bus repeater
PCA9515
PIN CONFIGURATION
NC 1 SCL0 SDA0 GND 2 3 4
8 7 6 5
VCC SCL1 SDA1 EN
DESCRIPTION
The PCA9515 is a BiCMOS integrated circuit intended for application in I2C and SMBus systems. While retaining all the operating modes and features of the I2C system it permits extension of the I2C-bus by buffering both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. The capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9515 enables the system designer to isolate two halves of a bus, thus more devices or longer length can be accommodated. It can also be used to run two buses, one at 5 V and the other at 3.3 V or a 400 kHz and 100 kHz bus, where the 100 kHz bus is isolated when 400 kHz operation of the other is required. I2C-bus
SU01322
Figure 1. Pin configuration
PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 SYMBOL NC SCL0 SDA0 GND EN SDA1 SCL1 VCC FUNCTION No connection Serial clock bus 0 Serial data bus 0 Supply ground Active high repeater enable input Serial data bus 1 Serial clock bus 1 Supply power
FEATURES
* 2 channel, bi-directional buffer * I2C-bus and SMBus compatible * Active high repeater enable input * Open-drain input/outputs * Lock-up free operation * Supports arbitration and clock stretching across the repeater * Accommodates standard mode and fast mode I2C devices and * Powered-off high impedance I2C pins * Operating supply voltage range of 3.0 V to 3.6 V * 5 V tolerant I2C and enable pins * 0 to 400 kHz clock frequency1 * ESD protection exceeds 2000 V HBM per JESD22-A114, * Latch-up testing is done to JEDEC Standard JESD78 which * Package offerings: SO and TSSOP
ORDERING INFORMATION
PACKAGES 8-pin plastic SO 8-pin plastic TSSOP exceeds 100 mA. 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101. multiple masters
TEMPERATURE RANGE -40 to +85 C -40 to +85 C
ORDER CODE PCA9515D PCA9515DP
DRAWING NUMBER SOT96-1 SOT505-1
Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.
1.
The maximum system operating frequency may be less than 400 KHz because of the delays added by the repeater.
2002 May 13
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853-2223 28185
Philips Semiconductors
Product data
I2C bus repeater
PCA9515
VCC
PCA9515
SDA0 SDA1
SCL0
SCL1
PULL-UP RESISTOR EN
GND
SU01323
Figure 2. Block Diagram: PCA9515 The output pull-down of each internal buffer is set for approximately 0.5 V, while the input threshold of each internal buffer is set about 0.07 V lower, when the output is internally driven low. This prevents a lock-up condition from occurring.
I2C Systems
As with the standard I2C system, pull-up resistors are required to provide the logic HIGH levels on the Buffered bus. (Standard open-collector configuration of the I2C-bus). The size of these pull-up resistors depends on the system, but each side of the repeater must have a pull-up resistor. This part designed to work with standard mode and fast mode I2C devices in addition to SMBus devices. Standard mode I2C devices only specify 3 mA output drive, this limits the termination current to 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. Please see Application Note AN255 "I 2C & SMBus Repeaters, Hubs and Expanders" for additional information on sizing resistors and precautions when using more than one PCA9515/PCA9516 in a system or using the PCA9515/16 in conjunction with the P82B96.
FUNCTIONAL DESCRIPTION
The PCA9515 BiCMOS integrated circuit contains two identical buffer circuits which enable I2C and similar bus systems to be extended without degradation of system performance. The PCA9515 BiCMOS integrated circuit contains two bi-directional, open drain buffers specifically designed to support the standard low-level-contention arbitration of the I2C-bus. Except during arbitration or clock stretching, the PCA9515 acts like a pair of non-inverting, open drain buffers, one for SDA and one for SCL.
Enable
The EN pin is active high with an internal pull up and allows the user to select when the repeater is active. This can be used to isolate a badly behaved slave on power up until after the system power up reset. It should never change state during an I2C operation because disabling during a bus operation will hang the bus and enabling part way through a bus cycle could confuse the I2C parts being enabled. The enable pin should only change state when the global bus and the repeater port are in an idle state to prevent system failures.
2002 May 13
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Philips Semiconductors
Product data
I2C bus repeater
PCA9515
APPLICATION INFORMATION
A typical application is shown in Figure 3. In this example, the system master is running on a 3.3 V I2C-bus while the slave is connected to a 5 V bus. Both buses run at 100 kHz unless the slave bus is isolated and then the master bus can run at 400 kHz. Master devices can be placed on either bus. The PCA9515 is 5 V tolerant so it does not require any additional circuitry to translate between the different bus voltages. When one side of the PCA9515 is pulled low by a device on the I2C-bus, a CMOS hysteresis type input detects the falling edge and causes an internal driver on the other side to turn on, thus causing the other side to also go low. The side driven low by the PCA9515 will typically be at VOL = 0.5 V. In order to illustrate what would be seen in a typical application, refer to Figure 4 and 5. If the bus master in Figure 3 were to write to the slave through the PCA9515, we would see the waveform shown in Figure 4 on Bus 0. This looks like a normal I2C transmission until the falling edge of the 8th clock pulse. At that point, the master releases the data line (SDA) while the slave pulls it low through the PCA9515. Because the VOL of the PCA9515 is typically around 0.5 V, a step in the SDA will be seen. After the master has transmitted the 9th clock pulse, the slave releases the data line.
3.3 V
5V
SDA SCL BUS MASTER 400 kHz
SDA0 SCL0
SDA1 SCL1
SDA SCL SLAVE 100 kHz
PCA9515 EN
BUS0
BUS1
SW00867
Figure 3. Typical application
2 V/DIV 9th CLOCK PULSE
VOL OF PCA9515
VOL OF MASTER
SW00866
Figure 4. Bus 0 waveform
2002 May 13
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Philips Semiconductors
Product data
I2C bus repeater
PCA9515
On the Bus 1 side of the PCA9515, the clock and data lines would have a positive offset from ground equal to the VOL of the PCA9515. After the 8th clock pulse, the data line will be pulled to the VOL of the slave device that is very close to ground in our example.
It is important to note that any arbitration or clock stretching events on Bus 1 require that the VOL of the devices on Bus 1 be 70 mV below the VOL of the PCA9515 (see VOL - Vilc in the DC Characteristics section) to be recognized by the PCA9515 and then transmitted to Bus 0.
9th CLOCK PULSE
2 V/DIV
VOL OF PCA9515
VOL OF SLAVE
SW00865
Figure 5. Bus 1 waveform
2002 May 13
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Philips Semiconductors
Product data
I2C bus repeater
PCA9515
ABSOLUTE MAXIMUM RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134). Voltages with respect to pin GND. LIMITS SYMBOL VCC to GND Vbus I Ptot Tstg Tamb Supply voltage range VCC Voltage range I2C-bus, SCL or SDA DC current (any pin) Power dissipation Storage temperature range Operating ambient temperature range PARAMETER MIN. -0.5 -0.5 -- -- -55 -40 MAX. +7 +7 50 100 +125 +85 UNIT V V mA mW C C
DC ELECTRICAL CHARACTERISTICS
VCC = 3.0 to 3.6 V; GND = 0 V; Tamb = -40 to +85 C; unless otherwise specified. SYMBOL Supplies VCC ICCH ICCL DC supply voltage Quiescent supply current, both channels HIGH Quiescent supply current, both channels LOW Quiescent supply current in contention VCC = 3.6 V; SDAn = SCLn = VCC VCC = 3.6 V; one SDA and one SCL = GND, other SDA and SCL open VCC = 3.6 V; SDAn = SCLn = GND 3.0 -- -- 3.3 2.3 2.3 3.6 5 5 V mA mA PARAMETER TEST CONDITIONS LIMITS MIN. TYP. MAX. UNIT
ICCLc
--
2.1
5
mA
Input SCL; input/output SDA VIH VIL VILc VIK II IIL VOL VOL-VILc IOH CI Enable VIL VIH IIL ILI CI LOW level input voltage HIGH level input voltage Input current LOW, EN Input leakage current Input capacitance VI = 3.0 V or 0 V VI = 0.2 V, EN -0.5 2.0 -- -1 -- -- -- 10 -- 6 0.8 5.5 30 1 7 V V A A pF High-level input voltage Low-level input voltage (Note 1) Low-level input voltage contention (Note 1) Input clamp voltage Input leakage current Input current LOW, SDA, SCL Low level output Low level input voltage below output low level voltage Output high level leakage current Input capacitance II = -18 mA VI = 3.6 V VI = 0.2 V, SDA, SCL IOL = 0 or 6 mA Guaranteed by design VO = 3.6 V VI = 3 V or 0 V 0.7 VCC -0.5 -0.5 -- -- -- 0.47 -- -- -- -- -- -- -- -- -- 0.52 -- -- 6 5.5 0.3 VCC 0.4 -1.2 1 10 0.6 70 10 7 V V V V A A V mV A pF
NOTE: 1. VIL specification is for enable input and the first low level seen by the SDAx/SCLx lines. VILc is for the second and subsequent low levels seen by the SDAx/SCLx lines.
2002 May 13
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Philips Semiconductors
Product data
I2C bus repeater
PCA9515
AC ELECTRICAL CHARACTERISTICS
SYMBOL tPHL tPLH tTHL tTLH tSET tHOLD PARAMETER Propagation delay Propagation delay Transition time Transition time Enable to Start condition Enable after Stop condition TEST CONDITIONS Waveform 1 Waveform 1 Waveform 1 Waveform 1; Note 1 LIMITS MIN. 57 33 -- -- 100 100 TYP. 98 55 67 135 -- -- MAX. 170 78 -- -- -- -- UNIT ns ns ns ns ns ns
NOTE: 1. The tTLH transition time is specified with loads of 1.35 k pull-up resistance and 7 pF load capacitance, plus an additional 50 pF load capacitance. Different load resistance and capacitance will alter the RC time constant, thereby changing the propagation delay and transition times.
AC WAVEFORMS
3.3 V INPUT 1.5 V 1.5 V 0.1 V tPHL 80% OUTPUT 1.5 V 20% tTHL 1.5 V 20% VOL tTLH tPLH 3.3 V 80%
TEST CIRCUIT
VCC VCC
VIN PULSE GENERATOR RT D.U.T.
VOUT
RL
CL
Test Circuit for Open Drain Outputs
SW00646
DEFINITIONS
RL = Load resistor; 1.35 k CL = Load capacitance includes jig and probe capacitance; 7 pF RT = Termination resistance should be equal to ZOUT of pulse generators.
SW00792
Waveform 1.
2002 May 13
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Philips Semiconductors
Product data
I2C bus repeater
PCA9515
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
2002 May 13
8
Philips Semiconductors
Product data
I2C bus repeater
PCA9515
TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm
SOT505-1
2002 May 13
9
Philips Semiconductors
Product data
I2C bus repeater
PCA9515
Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specifications defined by Philips. This specification can be ordered using the code 9398 393 40011.
Data sheet status
Data sheet status [1] Objective data Preliminary data Product status [2] Development Qualification Definitions This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 05-02
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 09814
Philips Semiconductors
2002 May 13 10

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