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1 ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice doc. no. 1095, rev. h cat34c02 2-kb i 2 c eeprom for ddr2 dimm serial presence detect pin configuration functional symbol features supports standard and fast i 2 c protocol 1.7 v to 5.5 v supply voltage range 16-byte page write buffer hardware write protection for entire memory software write protection for lower 128 bytes schmitt triggers and noise suppression filters on i 2 c bus inputs (scl and sda). low power cmos technology 1,000,000 program/erase cycles 100 year data retention rohs-compliant packages industrial temperature range tssop (y) tdfn (vp2) v cc v ss sd a scl wp cat34c02 a 2 , a 1 , a 0 device description the cat34c02 is a 2-kb serial cmos eeprom, internally organized as 16 pages of 16 bytes each, for a total of 256 bytes of 8 bits each. it features a 16-byte page write buffer and supports both the standard (100 khz) as well as fast (400 khz) i 2 c protocol. write operations can be inhibited by taking the wp pin high (this protects the entire memory) or by setting an internal write protect ?ag via software command (this protects the lower half of the memory). in addition to permanent software write protection, the cat34c02 also features jedec compatible reversible software write protection for ddr2 serial presence detect (spd) applications operating over the 1.7 v to 3.6 v supply voltage range. the cat34c02 is fully backwards compatible with earlier ddr1 spd applications operating over the 1.7 v to 5.5 v supply voltage range. 8 7 6 5 v cc wp scl sda a 2 a 0 a 1 v ss 1 2 3 4 for the location of pin 1, please consult the corresponding package drawing. pin functions a 0 , a 1 , a 2 device address input sda serial data input/output scl serial clock input wp write protect input v cc power supply v ss ground * catalyst carries the i 2 c protocol under a license from the philips corporation. for ordering information details, see page 14.
cat34c02 2 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice absolute maximum ratings* storage temperature -65c to +150c voltage on any pin with respect to ground (1) -0.5 v to +6.5 v * stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this speci?cation is not implied. exposure to any absolute maximum rating for extended periods may af fect device performance and reliability. reliability characteristics (2) symbol parameter min units n end (*) endurance 1,000,000 program/ erase cycles t dr data retention 100 years (*) page mode, v cc = 5 v, 25c d.c. operating characteristics v cc = 1.7 v to 5.5 v, t a = -40c to 85c, unless otherwise speci?ed. symbol parameter test conditions min max units i cc supply current read or write at 400 khz 1 ma i sb standby current all i/o pins at gnd or v cc 2 a i l i/o pin leakage pin at gnd or v cc 2 a v il input low voltage -0.5 v cc x 0.3 v v ih input high voltage v cc x 0.7 v cc + 0.5 v v ol1 output low voltage v cc > 2.5 v, i ol = 3.0 ma 0.4 v v ol2 output low voltage v cc > 1.7 v, i ol = 1.0 ma 0.2 v pin impedance characteristics t a = 25c, f = 400 khz, v cc = 5 v symbol parameter conditions min max units c in (2) sda i/o pin capacitance v in = 0 v 8 pf c in (2) input capacitance (other pins) v in = 0 v 6 pf z wpl wp input low impedance v in < 0.5 v 5 70 k i lwph wp input high leakage v in > v cc x 0.7 2 a note: (1) the dc input voltage on any pin should not be lower than -0.5 v or higher than v cc + 0.5 v. during transitions, the voltage on any pin may undershoot to no less than -1.5 v or overshoot to no more than v cc + 1.5 v, for periods of less than 20 ns. (2) these parameters are tested initially and after a design or process change that affects the parameter according to appropriate aec-q100 and jedec test methods.
cat34c02 3 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice a.c. characteristics (1) v cc = 1.8 v to 5.5 v, t a = -40c to 85c. symbol parameter standard fast units min max min max f scl clock frequency 100 400 khz t hd:sta start condition hold time 4 0.6 s t low low period of scl clock 4.7 1.3 s t high high period of scl clock 4 0.6 s t su:sta start condition setup time 4.7 0.6 s t hd:dat data hold time 0 0 s t su:dat data setup time 250 100 ns t r sda and scl rise time 1000 300 ns t f (2) sda and scl fall time 300 300 ns t su:sto stop condition setup time 4 0.6 s t buf bus free time between stop and start 4.7 1.3 s t aa scl low to sda data out 3.5 0.9 s t dh data out hold time 100 100 ns t i (2) noise pulse filtered at scl and sda inputs 100 100 ns t su:wp wp setup time 0 0 s t hd:wp wp hold time 2.5 2.5 s t wr write cycle time 5 5 ms t pu (2, 3) power-up to ready mode 1 1 ms note: (1) test conditions according to a.c. test conditions table. (2) tested initially and after a design or process change that affects this paramete. (3) t pu is the delay between the time v cc is stable and the device is ready to accept commands. a.c. test conditions input levels 0.2v cc to 0.8v cc input rise and fall times < = 50 ns input reference levels 0.3v cc , 0.7v cc output reference levels 0.5v cc output load current source: i ol = 3ma; c l = 100pf
cat34c02 4 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice power-on reset (por) the cat34c02 incorporates power-on reset (por) circuitry which protects the internal logic against powering up in the wrong state. the cat34c02 will power up into standby mode after v cc exceeds the por trigger level and will power down into reset mode when v cc drops below the por trigger level. this bi-directional por feature protects the device against brown-out failure following a temporary loss of power. pin description scl: the serial clock input pin accepts the serial clock generated by the master. sda: the serial data i/o pin receives input data and transmits data stored in eeprom. in transmit mode, this pin is open drain. data is acquired on the positive edge, and is delivered on the negative edge of scl. a 0 , a 1 and a 2 : the address pins accept the device ad - dress. these pins have on-chip pull-down resistors. wp: the write protect input pin inhibits all write op - erations, when pulled high. this pin has an on-chip pull-down resistor. functional description the cat34c02 supports the inter-integrated circuit (i 2 c) bus data transmission protocol, which de?nes a device that sends data to the bus as a transmitter and a device receiving data as a receiver. data ?ow is controlled by a master device, which generates the serial clock and all start and stop conditions. the cat34c02 acts as a slave device. master and slave alternate as either transmitter or receiver. up to 8 devices may be connected to the bus as determined by the device address inputs a 0 , a 1 , and a 2 . i 2 c bus protocol the i 2 c bus consists of two wires, scl and sda. the two wires are connected to the v cc supply via pull-up resistors. master and slave devices connect to the 2- wire bus via their respective scl and sda pins. the transmitting device pulls down the sda line to transmit a 0 and releases it to transmit a 1. data transfer may be initiated only when the bus is not busy (see a.c. characteristics). during data transfer, the sda line must remain stable while the scl line is high . an sda transition while scl is high will be interpreted as a start or stop condition (figure 1). start the start condition precedes all commands. it consists of a high to low transition on sda while scl is high. the start acts as a wake-up call to all receivers. absent a start, a slave will not respond to commands. stop the stop condition completes all commands. it consists of a low to high transition on sda while scl is high. the stop starts the internal write cycle (when follow - ing a write command) or sends the slave into standby mode (when following a read command). device addressing the master initiates data transfer by creating a start condition on the bus. the master then broadcasts an 8-bit serial slave address. the ?rst 4 bits of the slave address are set to 1010, for normal read/write opera - tions (figure 2). the next 3 bits, a 2 , a 1 and a 0 , select one of 8 possible slave devices. the last bit, r/ w , speci?es whether a read (1) or write (0) operation is to be performed. acknowledge after processing the slave address, the slave responds with an acknowledge (ack) by pulling down the sda line during the 9 th clock cycle (figure 3). the slave will also acknowledge the byte address and every data byte presented in write mode. in read mode the slave shifts out a data byte, and then releases the sda line during the 9 th clock cycle. if the master acknowledges the data, then the slave continues transmitting. the master terminates the session by not acknowledging the last data byte (noack) and by sending a stop to the slave. bus timing is illustrated in figure 4.
cat34c02 5 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice figure 3. acknowledge timing figure 2. slave address bits ac kn ow ledge 1 st ar t scl fr om master 8 9 da ta outpu t fr om transmitter da ta outpu t fr om receiver st ar t bit sd a st op bit scl figure 1. start/stop timing figure 4. bus timing t high scl sda in sda out t low t f t low t r t buf t su:s to t su:d at t hd:d at t hd:s ta t su:s ta t aa t dh 1 0 1 0 device address a 2 a 1 a 0 r/w
cat34c02 6 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice write operations byte write in byte write mode the master sends a start, followed by slave address, byte address and data to be written (figure 5). the slave acknowledges all 3 bytes, and the master then follows up with a stop, which in turn starts the internal write operation (figure 6). during internal write, the slave will not acknowledge any read or write request from the master. page write the cat34c02 contains 256 bytes of data, arranged in 16 pages of 16 bytes each. a page is selected by the 4 most signi?cant bits of the address byte following the slave address, while the 4 least signi?cant bits point to the byte within the page. up to 16 bytes can be written in one write cycle (figure 7). the internal byte address counter is automatically in - cremented after each data byte is loaded. if the master transmits more than 16 data bytes, then earlier bytes will be overwritten by later bytes in a wrap-around fashion (within the selected page). the internal write cycle starts immediately following the stop. acknowledge polling acknowledge polling can be used to determine if the cat34c02 is busy writing or is ready to accept com - mands. polling is implemented by interrogating the device with a selective read command (see read operations). the cat34c02 will not acknowledge the slave address, as long as internal write is in progress. delivery state the cat34c02 is shipped unprotected, i.e. neither swp ?ag is set. the entire 2-kb memory is erased, i.e. all bytes are ffh.
cat34c02 7 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice figure 7. page write timing figure 6. write cycle timing bus ac tivity : master sd a lin e da ta n+ p byte address (n) a c k a c k da ta n a c k s t o p s a c k da ta n+1 a c k s t a r t p sla ve address no te: in this example n = xxxx 0000(b); x = 1 or 0 t wr st op condition st ar t condition address ac k 8 th bi t byte n scl sd a figure 5. byte write timing byte address sla ve address s a c k a c k da ta a c k s t o p p bus ac tivity : master sd a lin e s t a r t figure 8. wp timing 1 8 9 1 8 a 7 a 0 d 7 d 0 t su:w p t hd:w p byte address data scl sda wp
cat34c02 8 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice read operations immediate address read in standby mode, the cat34c02 internal address counter points to the data byte immediately following the last byte accessed by a previous operation. if that previous byte was the last byte in memory, then the address counter will point to the 1 st memory byte, etc. when, following a start, the cat34c02 is presented with a slave address containing a 1 in the r/ w bit position (figure 9), it will acknowledge (ack) in the 9 th clock cycle, and will then transmit data being pointed at by the internal address counter. the master can stop further transmission by issuing a noack, followed by a stop condition. selective read the read operation can also be started at an address different from the one stored in the internal address coun - ter. the address counter can be initialized by performing a dummy write operation (figure 10). here the start is followed by the slave address (with the r/ w bit set to 0) and the desired byte address. instead of follow - ing up with data, the master then issues a 2 nd start, followed by the immediate address read sequence, as described earlier. sequential read if the master acknowledges the 1 st data byte transmitted by the cat34c02, then the device will continue trans - mitting as long as each data byte is acknowledged by the master (figure 11). if the end of memory is reached during sequential read, then the address counter will wrap-around to the beginning of memory, etc. sequential read works with either immediate address read or selective read, the only difference being the starting byte address.
cat34c02 9 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice figure 11. sequential read timing bus ac tivity : master sd a lin e da ta n+x da ta n a c k a c k da ta n+1 a c k s t o p n o a c k da ta n+2 a c k p sla ve address figure 10. selective read timing sla ve address s a c k n o a c k s t o p p bus ac tivity : master sd a lin e s t a r t byte address (n) s a c k da ta n sla ve address a c k s t a r t figure 9. immediate address read timing scl sd a 8 th bit st op no ac k da ta out 8 9 sla ve address s a c k da ta n o a c k s t o p p bus ac tivity : master sd a lin e s t a r t
cat34c02 10 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice software write protection the lower half of memory (?rst 128 bytes) can be protected against write requests by setting one of two software write protection (swp) ?ags. the permanent software write protection (pswp) ?ag can be set or read while all address pins are at regular cmos levels (gnd or v cc ), whereas the very high voltage v hv must be present on address pin a 0 to set, clear or read the reversible software write protection ( rswp ) ?ag. the d.c. operating conditions for rswp operations are shown in table 1. the swp commands are listed in table 2. all commands are preceded by a start and terminated with a stop, following the ack or noack from the cat34c02. all swp related slave addresses use the pre-amble: 0110 (6h), instead of the regular 1010 (ah) used for memory access. for pswp commands, the three address pins can be at any logic level, whereas for rswp commands the address pins must be at pre-assigned logic levels. v hv is interpreted as logic 1. the v hv condition must be established on pin a 0 before the start and maintained just beyond the stop. otherwise an rswp request could be interpreted by the cat34c02 as a pswp request. the swp slave addresses follow the standard i 2 c convention, i.e. to read the state of the swp ?ag, the lsb of the slave address must be 1, and to set or clear a ?ag, it must be 0. for write commands a dummy byte address and dummy data byte must be provided (figure 12). in contrast to a regular memory read, a swp read does not return data. instead the cat34c02 will respond with noack if the ?ag is set and with ack if the ?ag is not set. therefore, the master can immediately follow up with a stop, as there is no meaningful data following the ack interval (figure 13). table 1: rswp d.c. operating conditions (1) symbol parameter test conditions min max units v hv a 0 overdrive (v hv - v cc ) 1.7 v < v cc < 3.6 v 4.8 v i hvd a 0 high voltage detector current 0.1 ma v hv a 0 very high voltage 7 10 v i hv a 0 input current @ v hv 1 ma (1) to prevent damaging the cat34c02 while applying v hv , it is strongly recommended to limit the power delivered to pin a 0 , by inserting a series resistor (> 1.5 k ) between the supply and the input pin. the resistance is only limited by the combination of v hv and maximum i hvd . while the resistor can be omitted if v hv is clamped well below 10 v, it nevertheless provides simple protection against eos events. as an example: v cc = 1.7 v, v hv = 8 v, 1.5 k < r s < 15 k . hardware write protection with the wp pin held high, the entire memory, as well as the swp ?ags are protected against write operations, see memory protection map below. if the wp pin is left ?oating or is grounded, it has no impact on the operation of the cat34c02. the state of the wp pin is strobed on the last falling edge of scl immediately preceding the ?rst data byte (figure 8). if the wp pin is high during the strobe inter - val, the cat34c02 will not acknowledge the data byte and the write request will be rejected. memory protection map softw are wr ite protectab le (by setting the write protect flags ) ffh 00h 7fh hardw are wr ite protectab le (by connecting wp pin to vcc)
cat34c02 11 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice wp a 2 a 1 a 0 pswp rswp b 7 to b 4 b 3 b 2 b 1 b 0 x a 2 a 1 a 0 1 x a 2 a 1 a 0 x no gnd a 2 a 1 a 0 0 x a 2 a 1 a 0 0 yes x yes x yes yes v cc a 2 a 1 a 0 0 x a 2 a 1 a 0 0 yes x yes x no no x a 2 a 1 a 0 0 x a 2 a 1 a 0 1 yes x gnd gnd v hv 1 x 0 0 1 x no x gnd gnd v hv 0 1 0 0 1 x no gnd gnd gnd v hv 0 0 0 0 1 0 yes x yes x yes yes v cc gnd gnd v hv 0 0 0 0 1 0 yes x yes x no no x gnd gnd v hv 0 0 0 0 1 1 yes x gnd v cc v hv 1 x 0 1 1 x no gnd gnd v cc v hv 0 x 0 1 1 0 yes x yes x yes yes v cc gnd v cc v hv 0 x 0 1 1 0 yes x yes x no no x gnd v cc v hv 0 x 0 1 1 1 yes set rswp clear rswp 0110 slave addres s set pswp actio n control pin levels (1 ) flag state (2 ) ack ? write cycle ack ? ack ? address byt e data byt e table 2. swp commands note: (1) here a 2 , a 1 and a 0 are either at v cc or gnd. (2) 1 stands for set, 0 stands for not set, x stands for dont care. figure 12. software write protect (write) figure 13. software write protect (read) byte address sla ve address s a c k a c k da ta s t o p p bus ac tivity : master sd a lin e s t a r t x x x x x x x x x x x x x x x = don't care x x n o a c k or a c k sla ve address s n o a c k or a c k s t o p p bus ac tivity : master sd a lin e s t a r t
cat34c02 12 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice 8-lead tssop (y) 8 5 1 4 e e1 e/ 2 pin #1 ident. d b l 1 e a a1 a2 see detail a see detail a seating plane c gage plane 0.25 symbol a a1 a2 b c d e e1 e l 1 mi n 0.05 0.80 0.09 2.90 6.30 6.4 4.30 0.00 8.00 nom 0.90 0.30 0.19 3.00 4.40 0.60 0.75 0.50 max 1.20 0.15 1.05 0.20 3.10 6.50 4.50 0.65 bs c notes: 1. all dimensions are in millimeters. 2. complies with jedec speci?cation mo-153.
cat34c02 13 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice 8-pad tdfn 2x3 package (vp2) e2 a2 e pin 1 index area l tdfn2x3 ( 03 ) .e ps a3 pin 1 id e b a1 3 x e d2 d a symbol a a1 a2 a3 b d d2 e e2 e l mi n 0.70 0.00 0.45 0.20 1.90 1.30 1.40 2.90 1.20 0.20 0.30 0.40 nom 0.75 0.02 0.55 0.20 re f 0.25 2.00 3.00 0.50 typ max 0.80 0.05 0.65 0.30 2.10 1.50 3.10 1.40 1.30 notes: 1. all dimensions are in millimeters. 2. complies with jedec speci?cation ms-229.
cat34c02 14 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice ordering information notes: ((1) all packages are rohs-compliant (lead-free, halogen-free) (2) the device used in the above example is a cat34c02yi-gt3 (tssop, industrial temperature, nipdau, tape & reel) (3) for additional package and temperature options, please contact your nearest catalyst semiconductor sales of? ce. prefix device # suffix 34c02 y i product number package cat temperature range i = industrial (-40 c to +85 c) company id y: vp2: tssop (lead-free, halogen-free) tdfn (lead-free, halogen-free) t3 C g t: tape & reel 3: 3000/reel lead finish blank: matte-tin g: nipdau lead plating package marking ymgf 3402i y = production year m = production month g = die revision 3402 = device code i = temperature range f = lead finish 4 = nipdau 3 = matte-tin 8-lead tssop 8-lead tdfn e a = device code (nipdau) e v = device code (matte-tin) n = traceability code y = production year m = production month e a n n n n y m notes: (1) the circle on the package marking indicates the location of pin 1.
cat34c02 15 doc no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice revision history date revision comments 09/27/05 a initial issue 09/28/05 b update features update absolute maximum ratings update d.c. operating characteristics update pin impedance characteristics update a.c. characteristics update i 2 c bus protocol - power-on reset (por) 10/03/05 c update power-on reset (por) 11/05/05 d update ordering information add tape and reel speci?cations 12/07/05 e update d.c. operating characteristics update pin impedance characteristics 12/21/05 f update d.c. operating characteristics 05/18/06 g update ordering information 05/22/06 h update pin functions update d.c. operating characteristics update a.c. characteristics add a.c. test conditions update figure 3 and 4 update software write protection update delivery state add table 1: rswp d.c. operating conditions update package marking
cat34c02 16 doc. no. 1095, rev. h ? 2006 by catalyst semiconductor, inc. characteristics subject to change without notice copyrights, trademarks and patents trademarks and registered trademarks of catalyst semiconductor include each of the following: dpp ? ae 2 ? minipot? catalyst semiconductor has been issued u.s. and foreign patents and has patent applications pending that protect its products. catalyst semiconductor makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose, nor that the use of its products will not infringe its intellectual property rights or the rights of third parties with respect to any particular use or application and specifically disclaims any and all liability arising out of any such use or application, including but not limited to, consequential or incidental damages. catalyst semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the catalyst semiconductor product could create a situation where personal injury or death may occur. catalyst semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. products with data sheets labeled advance information or preliminary and other products described herein may not be in production or offered for sale. catalyst semiconductor advises customers to obtain the current version of the relevant product information before placing orders. cir cuit diagrams illustrate typical semiconductor applications and may not be complete.
catalyst semiconductor, inc. corporate headquarters 1250 borregas avenue sunnyvale, ca 94089 phone: 408.542.1000 fax: 408.542.1200 www.catsemi.com publication #: 1095 revison: h issue date: 05/22/06

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