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shanghai belling corp., ltd BL93C56/bl93c66 1 BL93C56/bl93c66 2k bits (256 x 8 or 128 x 16)/ 4k bits (512 x 8 or 256 x 16) three-wire serial eeprom features three-wire serial interface v cc = 1.8v to 5.5v sequential read operation 2 mhz clock rate (5v) compatibility self-timed write cycle (5 ms max) 1 million write cycles guaranteed data retention > 100 years 8-lead pdip, 8-lead jedec soic and 8-lead tssop pac kages description the BL93C56/66 provides 2048/4096 bits of serial el ectrically erasable programmable read only memory (eeprom) organized as 128/256 words of 16 bits each , when the org pin is connected to vcc and 256/512 words of 8 bits each when it is tied to ground. the BL93C56/66 is available in space-saving 8-lead pdip , 8-lead tssop and 8-lead jedec soic packages. the bl9 3c56/66 is enabled through the chip select pin (cs), and accessed via a 3-wire serial interface co nsisting of data input (di), data output (do), and shift clock (sk). upon receiving a read instruction at di , the address is decoded and the data is clocked ou t serially on the data output pin do. the write cycle is completely self-timed and no separate erase cycl e is required before write. the write cycle is only enab led when it is in the erase/write enable state. when cs is brought high following the initiation of a write cycle, the do pin outputs the ready/busy status. order information partnumber package shipping BL93C56/66dip pdip8 tube BL93C56/66sop sop8 tube 2500pcs/tape&reel BL93C56/66tssop tssop8 tube 3000pcs/tape&reel
shanghai belling corp., ltd BL93C56/bl93c66 2 pin descriptions block diagram
shanghai belling corp., ltd BL93C56/bl93c66 3 electrical characteristics
shanghai belling corp., ltd BL93C56/bl93c66 4 ac electrical characteristics
shanghai belling corp., ltd BL93C56/bl93c66 5 functional description the BL93C56/66 is accessed via a simple and versati le three-wire serial communication interface. devic e operation is controlled by seven instructions issue d by the host processor. a valid instruction starts with a rising edge of cs and consists of a start bit (logi c1) followed by the appropriate op code and the d esired memory address location. read (read): the read (read) instruction contains the address c ode for the memory location to be read. after the instruction and address are decoded, data from the selected memory location is available at the serial output pin do. output data changes are synch ronized with the rising edges of serial clock sk. it should be noted that a dummy bit (logic 0) precedes the 8- or 16-bit data output string.the BL93C56/66 suppo rts sequential read operations.the device will automati cally increment the internal address pointer and cl ock out the next memory location as long as chip select (cs) is held high .in this case ,the dummy bit (logic 0)will not be clocked out between memory locations,thus allowi ng for a continuous steam of data to be read. erase/write (ewen): to assure data integrity, the part automatically g oes into the erase/write disable (ewds) state when power is first applied. an erase/w rite enable(ewen) instruction must be executed first before any programming instructions can be carried out. please note that once in the ewen state, programming remains enabled until an ewds instructi on is executed or vcc power is removed from the part . erase (erase): the erase (erase) instruction programs all bits in the specified memory location to the logical 1 state. the self-timed erase cycle start s once the erase instruction and address are decoded. the do pin outputs the ready/busy status of the part if cs is brought high after being kept low for a minim um of 250 ns (tcs). a logic 1 at pin do indicates that the selected memory location has been erased, and t he part is ready for another instruction. write (write): the write (write) instruction contains the 8 or 16 bits of data to be written into the specified memory location. the self-timed programmi ng cycle, twp, starts after the last bit of data is received at serial data input pin di. the do pin outputs the ready/busy status of the part if cs is brought high after being kept low for a minimum of 250 ns (tcs). a logi c 0 at do indicates that programming is still in progress. a logic 1 indicates that the memory location at t he specified address has been written with the data pattern contained in the instruction and the part is ready for further instructions. a ready/busy status cannot be obtained if the cs is brought high after the end of the selftimed programming cycle, twp.
shanghai belling corp., ltd BL93C56/bl93c66 6 erase all (eral): the erase all (eral) instruction programs every bi t in the memory array to the logic 1 state and is primarily used for testing purposes. t he do pin outputs the ready/busy status of the part if cs is brought high after being kept low for a minimum of 250 ns (tcs). the eral instruction is valid only at v cc = 5.0v 10%. write all (wral): the write all (wral) instruction programs all memo ry locations with the data patterns specified in the instruction. the do pin outputs th e ready/busy status of the part if cs is brought hi gh after being kept low for a minimum of 250 ns (tcs). the wr al instruction is valid only at vcc = 5.0v 10%. erase/write disable (ewds): to protect against accidental data disturb, the era se/write disable (ewds) instruction disables all programming modes a nd should be executed after all programming operations. the operation of the read instruction i s independent of both the ewen and ewds instructions and can be executed at any time. timing diagrams table6.organizationkeyfortimingdiagrams BL93C56(2k) bl93c66(4k) i/o x8 x16 x8 x16 an a8(1) a7(2) a8 a7 dn d7 d15 d7 d15 note:1a8isadon , tcarevalue,buttheextraclockisrequired 2a7isadon , tcarevalue,buttheextraclockisrequired
shanghai belling corp., ltd BL93C56/bl93c66 7
shanghai belling corp., ltd BL93C56/bl93c66 8
shanghai belling corp., ltd BL93C56/bl93c66 9 package information 8-lead pdip outline dimensions millimeter symbol min nom max a 3.60 3.80 4.00 a2 3.10 3.30 3.50 b 0.44 0.53 b1 1.52bsc c 0.25 0.31 c1 0.24 0.25 0.26 d 9.05 9.25 9.45 e1 6.15 6.35 6.55 e 2.54bsc ea 7.62bsc l 3.00
shanghai belling corp., ltd BL93C56/bl93c66 10 8leadsoicoutlinedimensions millimeter symbol min nom max a 1.77 a1 0.08 0.18 0.28 b 0.44 0.53 c 0.21 0.26 d 4.70 4.90 5.10 e 5.80 6.00 6.20 e1 3.70 3.90 4.10 e 1.27bsc 0 8
shanghai belling corp., ltd BL93C56/bl93c66 11 8-lead tssop outline dimensions millimeter symbol min nom max a 1.20 a1 0.05 0.15 a2 0.90 1.00 1.05 a3 0.34 0.44 0.54 b 0.20 0.28 b1 0.20 0.22 0.24 c 0.10 0.19 c1 0.10 0.13 0.15 d 2.83 2.93 3.03 e 6.20 6.40 6.60
shanghai belling corp., ltd BL93C56/bl93c66 12 e1 4.30 4.40 4.50 e 0.65bsc l 0.45 0.60 0.75 l1 1.00ref l2 0.25bsc r 0.09 r1 0.09 s 0.20 1 0 8 2 10 12 14 3 10 12 14

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