INTEGRATED CIRCUITS PCA9515 I2C-bus repeater Product data sheet Supersedes data of 2003 Nov 10 Philips Semiconductors 2004 Jun 24 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 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 I2C-bus 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. PIN CONFIGURATION n.c. 1 Two or more PCA9515s cannot be put in series. The PCA9515 design does not allow this configuration. Since there is no direction pin, slightly different “legal” low voltage levels are used to avoid lock-up conditions between the input and the output. A “regular low” applied at the input of a PCA9515 will be propagated as a “buffered low” with a slightly higher value. When this “buffered low” is applied to another PCA9515, PCA9516, or PCA9518 in series, the second PCA9515, PCA9516, or PCA9518 will not recognize it as a “regular low” and will not propagate it as a “buffered low” again. The PCA9511/9513/9514 and PCA9512 cannot be used in series with the PCA9515, PCA9516, or PCA9518 but can be used in series with themselves since they use shifting instead of static offsets to avoid lock-up conditions. 8 VCC SCL0 2 7 SCL1 SDA0 3 6 SDA1 GND 4 5 EN SU01322 Figure 1. Pin configuration PIN DESCRIPTION PIN 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 SYMBOL FUNCTION 1 n.c. No connection 2 SCL0 Serial clock bus 0 3 SDA0 Serial data bus 0 4 GND Supply ground 5 EN Active high repeater enable input 6 SDA1 Serial data bus 1 7 SCL1 Serial clock bus 1 8 VCC Supply power multiple masters • Powered-off high impedance I2C pins • Operating supply voltage range of 3.0 V to 3.6 V • 5.5 V tolerant I2C and enable pins • 0 to 400 kHz clock frequency1 • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101. • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA. • Package offerings: SO and TSSOP ORDERING INFORMATION TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DRAWING NUMBER 8-pin plastic SO PACKAGES –40 °C to +85 °C PCA9515D PCA9515 SOT96-1 8-pin plastic TSSOP –40 °C to +85 °C PCA9515DP 9515 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. 2004 Jun 24 2 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 VCC PCA9515 SDA0 SDA1 SCL0 SCL1 PULL-UP RESISTOR EN SU01323 GND Figure 2. PCA9515 block diagram I2C Systems 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. 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. 2004 Jun 24 3 Philips Semiconductors Product data sheet 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. 3.3 V SDA SCL BUS MASTER 400 kHz 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. 5V SDA0 SDA1 SDA SCL0 SCL1 SCL In order to illustrate what would be seen in a typical application, refer to Figures 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. 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 2004 Jun 24 4 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 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. 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. 2 V/DIV 9th CLOCK PULSE VOL OF PCA9515 VOL OF SLAVE SW00865 Figure 5. Bus 1 waveform 2004 Jun 24 5 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 ABSOLUTE MAXIMUM RATINGS Limiting values in accordance with the Absolute Maximum System (IEC 134). Voltages with respect to pin GND. SYMBOL LIMITS PARAMETER MIN. MAX. UNIT VCC to GND Supply voltage range VCC –0.5 +7 Vbus Voltage range I2C-bus, SCL or SDA –0.5 +7 V V I DC current (any pin) — 50 mA Ptot Power dissipation — 100 mW Tstg Storage temperature range –55 +125 °C Tamb Operating ambient temperature range –40 +85 °C DC ELECTRICAL CHARACTERISTICS VCC = 3.0 to 3.6 V; GND = 0 V; Tamb = –40 to +85 °C; unless otherwise specified. SYMBOL PARAMETER TEST CONDITIONS LIMITS MIN. TYP. MAX. UNIT Supplies VCC DC supply voltage 3.0 3.3 3.6 V ICCH Quiescent supply current, both channels HIGH VCC = 3.6 V; SDAn = SCLn = VCC — 2.3 5 mA ICCL Quiescent supply current, both channels LOW VCC = 3.6 V; one SDA and one SCL = GND, other SDA and SCL open — 2.3 5 mA ICCLc Quiescent supply current in contention VCC = 3.6 V; SDAn = SCLn = GND — 2.1 5 mA 0.7 VCC — 5.5 V Input SCL; input/output SDA VIH HIGH-level input voltage VIL LOW-level input voltage (Note 1) –0.5 — 0.3 VCC V VILc LOW-level input voltage contention (Note 1) –0.5 — 0.4 V VIK Input clamp voltage II = –18 mA — — –1.2 V II Input leakage current VI = 3.6 V — — ±1 µA IIL Input current LOW, SDA, SCL VI = 0.2 V, SDA, SCL µA LOW-level output voltage IOL = 0 or 6 mA LOW-level input voltage below output low level voltage IOH CI VOL VOL–VILc — — 10 0.47 0.52 0.6 V Guaranteed by design — — 70 mV Output HIGH level leakage current VO = 3.6 V — — 10 µA Input capacitance VI = 3 V or 0 V — 6 72 pF V Enable VIL LOW-level input voltage –0.5 — 0.8 VIH HIGH-level input voltage 2.0 — 5.5 V IIL Input current LOW, EN — 10 30 µA ILI Input leakage current –1 — 1 µA CI Input capacitance — 6 7 pF VI = 0.2 V, EN VI = 3.0 V or 0 V NOTE: 1. VIL specification is for 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. 2. The SCL/SDA CI is about 200 pF whe VCC = 0 V. The PCA9515A should be used in applications where power is secured to the repeater but an active bus remains on either set of SCL/SDA pins. 2004 Jun 24 6 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 AC ELECTRICAL CHARACTERISTICS — PCA9515 SYMBOL PARAMETER LIMITS TEST CONDITIONS MIN. TYP. MAX. UNIT tPHL Propagation delay Waveform 1 57 98 170 ns tPLH Propagation delay Waveform 1 33 55 78 ns tTHL Transition time Waveform 1 — 67 — ns tTLH Transition time Waveform 1; Note 1 — 135 — ns tSET Enable to Start condition 100 — — ns tHOLD Enable after Stop condition 100 — — ns NOTE: 1. The tTLH transition time is specified with loads of 1.35 kΩ 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 TEST CIRCUIT VCC 3.3 V INPUT 1.5 V 1.5 V 0.1 V tPHL VIN D.U.T. 3.3 V 80% RT 80% 1.5 V 20% RL VOUT PULSE GENERATOR tPLH OUTPUT VCC CL 1.5 V 20% VOL tTHL tTLH Test Circuit for Open Drain Outputs DEFINITIONS SW00646 RL = Load resistor; 1.35 kΩ Waveform 1. CL = Load capacitance includes jig and probe capacitance; 7 pF RT = Termination resistance should be equal to ZOUT of pulse generators. SW00792 2004 Jun 24 7 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 SO8: plastic small outline package; 8 leads; body width 3.9 mm 2004 Jun 24 8 SOT96-1 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm 2004 Jun 24 9 SOT505-1 Philips Semiconductors Product data sheet I2C-bus repeater PCA9515 REVISION HISTORY Rev Date Description _7 20040624 Product data sheet (9397 750 12875). Supersedes data of 2003 November 10 (9397 750 12294). Modifications: • Features section, tenth bullet: from “5 V tolerant ...” to “5.5 V tolerant ...” • DC electrical characteristics section: – Note 1: from “VIL specification is for enable input and the first low level seen ... ” to “VIL specification is for the first low level seen ... ”. – Add Note 2. _6 20031110 Product data (9397 750 12294); ECN 853-2223 30410 dated 03 October 2003. Supersedes data of 2002 May 13 (9397 750 09814). _5 20020513 Product data (9397 750 09814); ECN: 853-2223 28185 dated 2002 May 13. 2004 Jun 24 10 Philips Semiconductors Product data sheet 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 Level Data sheet status [1] Product status [2] [3] Definitions I Objective data Development 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. II Preliminary data Qualification 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. III Product data Production 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. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). [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. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status. 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 in the products—including circuits, standard cells, and/or software—described or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). 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. Koninklijke Philips Electronics N.V. 2004 All rights reserved. Printed in U.S.A. Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 Date of release: 06-04 For sales offices addresses send e-mail to: [email protected]. Document order number: Philips Semiconductors 2004 Jun 24 11 9397 750 12875