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cmos ic ordering number : enn6488 42800tn (ot) no. 6488-1/14 lc72720y, 72720YV sanyo electric co.,ltd. semiconductor company tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan overview the lc72720y and lc72720YV are single-chip system ics that implement the signal processing required by the european broadcasting union rds (radio data system) standard and by the us nrsc (national radio system committee) rdbs (radio broadcast data system) standard. these ics include band-pass filter, demodulator, synchronization, and error correction circuits as well as data buffer ram on chip and perform effective error correction using a soft-decision error correction technique. functions ? band-pass filter: switched capacitor filter (scf) ? demodulator: rds data clock regeneration and demodulated data reliability information ? synchronization: block synchronization detection (with variable backward and forward protection conditions) ? error correction: soft-decision/hard-decision error correction ? buffer ram: adequate for 24 blocks of data (about 500 ms) and flag memory ? data i/o: ccb interface (power on reset) features ? error correction capability improved by soft-decision error correction. ? the load on the control microprocessor can be reduced by storing decoded data in the on-chip data buffer ram. ? two synchronization detection circuits provide continuous and stable detection of the synchronization timing. ? data can be read out starting with the backward- protection block data after a synchronization reset. ? fully adjustment free. ? low voltage (supply voltage: 3.0 v min) type. ? operating power-supply voltage: 3.0 to 3.6 v ? operating temperature: ?40 to +85c ? package: dip24s, ssop30 ? ccb is a trademark of sanyo electric co., ltd. ? ccb is sanyo?s original bus format and all the bus addresses are controlled by sanyo. single-chip rds signal-processing system ic any and all sanyo products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft?s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo representative nearest you before using any sanyo products described or contained herein in such applications. sanyo assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo products described or contained herein. www.datasheet.co.kr datasheet pdf - http://www..net/
pin assignment block diagram no. 6488-2/14 lc72720y, 72720YV a13195 124 v ref syr 223 mpxin ce 322 vdda di 421 vssa cl 520 flout do 619 cin lc72720y top view rds-id 718 t1 sync 817 t2 t7(correc/ari-id/beo) 916 t3(rdcl) t6(error/57k/be1) 10 15 t4(rdda) vssd 11 14 t5(rsft) vddd 12 13 x out x in a13196 130 v ref syr 229 mpxin ce 328 vdda di 427 nc nc 526 vssa cl 625 flout lc72720YV top view do 724 cin rds-id 823 nc nc 922 t1 sync 10 21 t2 t7(correc/ari-id/beo) 11 20 t3(rdcl) nc t4(rdda) t5(rsft) t6(error/57k/be1) nc vssd vddd 12 19 13 18 14 17 15 16 x out x in reference voltage antialiasing filter smoothing filter 57khz bpf (scf) test ? + pll (57khz) v ref clock recovery (1187.5hz) data decoder sync detect-2 sync detect-1 osc/divider memory control clk(4.332mhz) +3.3v +3.3v vdda vssa mpxin t2 t3 to t7 t1 ccb di ce cl ram (24 block data) error correction (soft decision) sync/ec controller do x in x out syr sync rds-id vssd vddd cin flout v ref a13197 0.48 (3.25) 3.3 3.9max 0.51min 21.0 (0.71) 1.78 0.25 7.62 6.4 1 12 24 13 0.95 0.9 sanyo: dip24s [lc72720y] 115 16 7.6 0.65 9.75 0.5 5.6 0.1 1.5max 30 0.22 (0.33) 0.15 (1.3) sanyo: ssop30 [lc72720YV] package dimensions unit: mm 3067a-dip24s unit: mm 3191a-ssop30 www.datasheet.co.kr datasheet pdf - http://www..net/
pin functions no. 6488-3/14 lc72720y, 72720YV pin no. pin name function i/o pin circuit 1 vref reference voltage output (vdda/2) output 2 mpxin baseband (multiplexed) signal input input 5 / 6 flout subcarrier output (filter output) output 6 / 7 cin subcarrier input (comparator input) input 3 vdda analog system power supply (+3.3 v) ? ? 4 / 5 vssa analog system ground ? ? 12 / 15 xout crystal oscillator output (4.332/8.664 mhz) output 13 / 16 xin crystal oscillator input (external reference signal input) 7 / 9 t1 test input (this pin must always be connected to ground.) input 8 / 10 t2 test input (standby control) 0: normal operation, 1: standby state (crystal oscillator stopped) 9 / 11 t3 (rdcl) test i/o (rds clock output) 10 / 13 t4 (rdda) test i/o (rds data output) 11 / 14 t5 (rsft) test i/o (soft-decision control data output) 16 / 20 t6 (error/57k/be1) test i/o (error status output, regenerated carrier output, error block count i/o * output) 17 / 21 t7 (correc/ari-id/be0) test i/o (error correction status output, sk detection output, error block count output) 18 / 22 sync block synchronization detection output 19 / 24 rds-id rds detection output output 20 / 25 do data output 21 / 26 cl clock input 22 / 28 di data input input 23 / 29 ce chip enable 24 / 30 syr synchronization and ram address reset (active high) 14 / 17 vddd digital system power supply (+3.3 v) ? ? 15 / 18 vssd digital system ground ? ? note: * normally function as an output pin. used as an i/o pin in test mode, which is not available to user applications. pins 4, 8, 12, 19, 23, 27 are nc (no connect) pins for the ssop package version. serial data interface (ccb) vdda vssa a13198 vdda vssa a13199 a13200 + ? vdda v ref vssa a13201 + ? vddd vssd a13202 x out x in a13203 vssd s a13204 vssd a13205 vssd a13206 vssd s www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-4/14 lc72720y, 72720YV parameter symbol conditions ratings unit maximum supply voltage v dd max vddd, vdda ?0.3 to +7.0 v v in 1 max cl, di, ce, syr, t1, t2, t3, t4, t5, t6, t7, sync ?0.3 to +7.0 v maximum input voltage v in 2 max xin ?0.3 to vddd +0.3 v v in 3 max mpxin, cin ?0.3 to vdda +0.3 v v o 1 max do, sync, rds-id, t3, t4, t5, t6, t7 ?0.3 to +7.0 v maximum output voltage v o 2 max xout ?0.3 to vddd +0.3 v v o 3 max flout ?0.3 to vdda +0.3 v i o 1 max do, t3, t4, t5, t6, t7 6.0 ma maximum output current i o 2 max xout, flout 3.0 ma i o 3 max sync, rds-id 20.0 ma allowable power dissipation pd max ta 85c dip24s: 350 mw ssop30: 150 mw operating temperature topr ?40 to +85 c storage temperature tstg ?55 to +125 c specifications absolute maximum ratings at ta = 25c, vssd = vssa = 0 v parameter symbol conditions ratings unit min typ max supply voltage v dd 1 vddd, vdda 3.0 3.6 v v dd 2 vddd: serial data hold voltage 2.0 v input high-level voltage v ih cl, di, ce, syr, t1, t2 0.7 vddd 6.5 v input low-level voltage v il cl, di, ce, syr, t1, t2 0 0.3 vddd v output voltage v o do, sync, rds-id, t3, t4, t5, t6, t7 6.5 v v in 1 mpxin : f = 57 2 khz 50 mvrms input amplitude v in 2 mpxin : 100% modulation composite 100 mvrms v xin xin 400 1500 mvrms guaranteed crystal oscillator frequencies xtal xin, xout : ci 120 (xs = 0) 4.332 mhz xin, xout : ci 70 (xs = 1) 8.664 mhz crystal oscillator frequency deviation txtal xin, xout : f o = 4.332 mhz, 8.664 mhz 100 ppm data setup time t su di, cl 0.75 s data hold time t hd di, cl 0.75 s clock low-level time t cl cl 0.75 s clock high-level time t ch cl 0.75 s ce wait time t el ce, cl 0.75 s ce setup time t es ce, cl 0.75 s ce hold time t eh ce, cl 0.75 s ce high-level time t ce ce 20 ms data latch change time t lc 1.15 s t dc do, cl: differs depending on the value of the 0.46 s data output time pull-up resistor used. t dh do, ce: differs depending on the value of the 0.46 s pull-up resistor used. allowable operating ranges at ta = ?40 to +85c, vssd = vssa = 0 v parameter symbol conditions ratings unit min typ max input resistance rmpxin mpxin?vssa : f = 57 khz 23 k internal feedback resistance rf xin 1.5 m center frequency fc flout 56.5 57.0 57.5 khz ?3 db bandwidth bw ? 3 db flout 2.5 3.0 3.5 khz gain gain mpxin?floout : f = 57 khz 28 31 34 db att1 flout : f = 7 khz 30 db stop band attenuation att2 flout : f < 45 khz, f > 70 khz 40 db att3 flout : f < 20 khz 50 db electrical characteristics at ta = ?40 to +85c, vssd = vssa = 0 v continued on next page. www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-5/14 lc72720y, 72720YV parameter symbol conditions ratings unit min typ max group delay deviation g-delay flout: f = 57 1.2 khz 2.0 s reference voltage output vref vref : vdda = 3.3 v 1.65 v hysteresis v his cl, di, ce, syr, t1, t2 0.1 vddd v output low-level voltage v ol 1 do, t3, t4, t5, t6, t7 : i = 2 ma 0.5 v v ol 2 sync, rds-id : i = 8 ma 0.5 v input high-level current i ih 1 cl, di, ce, syr, t1, t2 : v i = vddd 5.0 a i ih 2 xin : v i = vddd 0.9 4.0 a input low-level current i il 1 cl, di, ce, syr, t1, t2 : v i = 0 v 5.0 a i il 2 xin : v i = 0 v 0.9 4.0 a output off leakage current i off do, sync, rds-id, t3, t4, t5, t6, t7 : 5.0 a v o = 6.5 v current drain i dd vddd + vdda, vddd = vdda = 3.3 v 6 ma continued from preceding page. ccb output data format ? each block of output data consists of 32 bits (4 bytes), of which 2 bytes are rds data and 2 bytes are flag data. ? any number of 32-bit output data blocks can be output consecutively. ? when there is no data that can be read out in the internal memory, the system outputs blocks of all-zero data consecutively. ? if data readout is interrupted, the next read operation starts with the 32-bit data block whose readout was interrupted. however, if only the last bit is remaining to be read, it will not be possible to reread that whole block. ? the check bits (10 bits) are not output. ? the data valid / invalid decision is made by referencing the error information flag (e0 to e2) but the offset word detection flag (owd) must not be referred to. ? when the first leading bits are not ?1010?, the read in data is invalid, and the read operation is cancelled. (1) offset word detection flag (1 bit): owd owd offset word detection 1 detected 0 not detected (protection function operating) di do a13207 0 1010 owd b2 b1 b0 re rf1 rf0 ari syc e2 e1 e0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 0 b1 b0 1 b2 1 b3 0 a0 1 a1 1 a2 0 a3 ccb address 6c output data/first bit last bit (8) rds data (7) error information flags (6) synchronization established flag (5) ari (sk) detection flag (4) ram data remaining flags (3) consecutive ram read out possible flag (2) offset word information flags (1) offset word detection flag fixed pattern (1010) www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-6/14 lc72720y, 72720YV (3) consecutive ram readout possible flag (1 bit): re re ram data information 1 the next data to be read out is in ram. 0 this data item is the last item in ram, and the next data is not present. ari sk signal 1 detected 0 not detected (4) ram data remaining flag (2 bits): rf0, rf1 caution: this value is only meaningful when re is 1. when re is 0, there is no data in ram, even if rf is 0. if a synchronization reset was applied using syr, then the backward protection block data that was written to memory is also co unted in this value. caution: this flag indicates the synchronization state of the circuit at the point where the data block being output was receive d. on the other hand, the sync pin (pin 18 / 22) output indicates the current synchronization state of the circuit. caution: if the number of errors exceeds the value of the ec0 to ec2 setting (see the section on the ccb input format), the erro r information flags will be set to the ?correction not possible? value. when the error flags ec0 to ec2 are 011 (indicating that correction is not possible ) the data must be handled as invalid data. rf1 rf0 remaining data in ram (number of blocks) 0 0 1 to 7 0 1 8 to 15 1 0 16 to 23 11 24 (5) ari (sk) detection flag (1 bit): ari syc synchronization detection 1 synchronized 0 not synchronized (6) synchronization established flag (1 bit): syc (7) error information flags (3 bits): e0 to e2 (8) rds data (16 bits): d0 to d15 this data is output with the msb first and the lsb last. caution: when error correction was not possible, the input data is output without change. e e e number of 2 1 0 bits corrected 0 0 0 0 (no errors) 001 1 010 2 011 3 100 4 101 5 1 1 0 correction not possible 1 1 1 unused (2) offset word information flag (3 bits): b0 to b2 bbb offset word 210 000 a 001 b 010 c 011 c? 100 d 101 e 1 1 0 unused 1 1 1 unused www.datasheet.co.kr datasheet pdf - http://www..net/
ccb input data format caution: the bits labeled with an asterisk must be set to 0. (1) synchronization protection (forward protection) method setting (4 bits): fs0 to fs3 fs3 = 0: if offset words in the correct order could not be detected continuously during the number of blocks specified by fs0 to fs2, take that to be a lost synchronization state. fs3 = 1: if blocks with uncorrectable errors were received consecutively during the number of blocks specified by fs0 to fs2, take that to be a lost synchronization state. no. 6488-7/14 lc72720y, 72720YV initial value: fs0 = 0, fs1 = 1, fs2 = 0, fs3 = 0 initial value: bs = 0 fff s s s condition for detecting lost synchronization 012 0 0 0 if 3 consecutive blocks matching the fs3 condition are received. 1 0 0 if 4 consecutive blocks matching the fs3 condition are received. 0 1 0 if 5 consecutive blocks matching the fs3 condition are received. 1 1 0 if 6 consecutive blocks matching the fs3 condition are received. 0 0 1 if 8 consecutive blocks matching the fs3 condition are received. 1 0 1 if 10 consecutive blocks matching the fs3 condition are received. 0 1 1 if 12 consecutive blocks matching the fs3 condition are received. 1 1 1 if 16 consecutive blocks matching the fs3 condition are received. (2) synchronization detection method setting (1 bit): bs bs synchronization detection conditions 0 if during 3 blocks, 2 blocks of offset words were detected in the correct order. 1 if the offset words were detected in the correct order in 2 consecutive blocks. di a13208 0 b0 1 b1 0 b2 1 b3 0 a0 1 a1 1 a2 0 a3 fs0fs1fs2fs3 bs syr * *** * ** owe ec0 ec1 ec2 ec3 ec4 ct0 di a13209 1 b0 1 b1 0 b2 1 b3 0 a0 1 a1 1 a2 0 a3 ct1 xs pl0 pl1 rm pt0 pt1 pt2 ts0 ts1 ts2 ts3 [1] ccb address 6a [2] ccb address 6b in1 data, first bit in2 data, first bit (11) circuit control (5) error correction method setting (4) ram write control (3) synchronization and ram address reset (2) synchronization detection method setting (1) synchronization protection method setting (10) test mode settings (9) output pin settings (8) rds/rbds selection (7) demodulation circuit phase control (6) crystal oscillator frequency selection (11) circuit control www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-8/14 lc72720y, 72720YV (3) synchronization and ram address reset (1 bit): syr initial value: syr =0 caution: 1. to apply a synchronization reset, set syr to 1 temporarily using the ccb, and then set it back to 0 again using the c cb. the circuit will start synchronization capture operation at the point syr is set to 0. 2. the syr pin (pin 24 / 30) also provides an identical reset control operation. applications can use either method. however, th e control method that is not used must be set to 0 at all times. any pulse with a width of over 250 ns will suffice. 3. a reset must be applied immediately after the reception channel is changed. if a reset is not applied, reception data from th e previous channel may remain in memory. 4. data read out after a synchronization reset is read out starting with the backward protection block data preceding the establ ishment of synchronization. syr synchronization detection circuit ram 0 normal operation (reset cleared) normal write (see the description of the owe bit.) 1 forced to the unsynchronized state (synchronization reset) after the reset is cleared, start writing from the data prior to the establishment of synchronization, i.e. the data in backward protection. initial value: owe = 0 initial values: ec0 = 0, ec1 = 1, ec2 = 0, ec3 = 0, ec4 = 1 caution: 1. if soft-decision a or soft-decision b is specified, soft-decision control will be performed even if the number of bit s corrected is set to 0 (error detection only). with these settings, data will be output for blocks with no errors. 2. as opposed to soft-decision b, the soft-decision a setting suppresses soft decision error correction. (4) ram write control (1 bit): owe (5) error correction method setting (5 bits): ec0 to ec4 owe ram write conditions 0 only data for which synchronization had been established is written. 1 data for which synchronization not has been established (unsynchronized data) is also written. (however, this applies when syr = 0.) eee number of ccc bits corrected 012 0 0 0 0 (error detection only) 1 0 0 1 or fewer bits 0 1 0 2 or fewer bits 1 1 0 3 or fewer bits 0 0 1 4 or fewer bits 1 0 1 5 or fewer bits 0 1 1 illegal value 1 1 1 illegal value ee c c soft-decision setting 34 0 0 mode 0: hard decision 1 0 mode 1: soft decision a 0 1 mode 2: soft decision b 1 1 illegal value (6) crystal oscillator frequency selection (1 bit): xs xs = 0: 4.332 mhz xs = 1: 8.664 mhz initial value: xs = 0 (7) demodulation circuit phase control (2 bits): pl0, pl1 initial values: pl0 = 0, pl1 = 1 caution: 1. when pl0 is 0 (normal operation), the ic detects the presence or absence of the ari signal and reproduces the rds dat a by automatically controlling the demodulation phase with respect to the reproduced carrier. however, the initial phase following a synchronizati on reset is set by pl1. 2. if pl0 is set to 1, the demodulation circuit phase is locked according to the pl1 setting at either 90 (pl1 = 0) or 0 (pl1 = 1), allowing rds data to be reproduced. when ari is not present, pl1 should be set to 0, since the rds data is reproduced by detecting at a phas e of 90 with respect to the reproduced carrier. when ari is present, pl1 should be set to 1, since detection is at 0. in cases where t he ari presence is known in advance, more stable reproduction can be achieved by fixing the demodulation phase in this manner. pl0 pl1 demodulation circuit phase control 0 0/1 when ari presence or absence is unclear. 1 0 if the circuit determines that the ari signal is absent: 90 phase 1 if the circuit determines that the ari signal is present: 0 phase www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-9/14 lc72720y, 72720YV (8) rds/rbds (mmbs) selection (1 bit): rm initial value: rm = 0 ?: open, : output enabled ( = reverse polarity) initial values: pt0 = 1, pt1 = 1, pt2 = 0 (mode 3) caution: 1. when pt2 is set to 1, the polarity of the t3 (rdcl), t6 (error/57k), t7 (correc/ari-id) sync, and rds-id pins changes to active high. 2. the output pins (t3 to t7, sync, and rds-id) are all open-drain pins, and require external pull-up resistors to output data. these pins indicate the number of blocks in a set of 48 blocks that had errors before correction. the output polarity of these pins is fixed at the values listed in the table. rm rbds support decoding method 0 none only rds data is decoded correctly (offset word e is not detected.) 1 provided rds and mmbs data is decoded correctly (offset word e is also detected.) (9) output pin settings (3 bits): pt0 to pt2 these bits control the t3, t4, t5, t6, t7, sync, and rds-id pins. ppp t3 t4 t5 t6 t7 mode t t t 0 1 2 rdcl rdda rsft error 57k be1 correc ari-id be0 0000????????? 1100 ?????? 6011 ? ?? ? 7111 ?? ?? item pin t3 (rdcl) pt2 = 0 data (rdda and rsft) changes on this pin?s rising edge. pt2 = 1 data (rdda and rsft) changes on this pin?s falling edge. mode 2 (pt2 = 0) pin t7 (ari-id) no sk high (1) sk present low (0) mode 3 (pt2 = 0) pin t6 (error) pin t7 (correc) correction not possible low (0) low (0) errors corrected high (1) low (0) no errors high (1) high (1) mode 4 pin t6 (be1) pin t7 (be0) number of error blocks (b) b = 0 low (0) low (0) 1 b 20 low (0) high (1) 20 < b 40 high (1) low (0) 40 < b 48 high (1) high (1) www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-10/14 lc72720y, 72720YV caution: the output indicates the synchronization state for the previous block. mode (pt2 = 0) the sync pin 0 to 2 when synchronized: low (0). when unsynchronized: high (1) when synchronized: goes high for a fixed period (421 s) at 3 the start of a block and then goes low. when unsynchronized: high (1) when pt2 = 0 the rds-id pin no rds high (1) rds present low (0) (10) test mode settings (4 bits): ts0 to ts3 initial values: ts0 = 0, ts1 = 0, ts2 = 0, ts3 = 0 (applications must set these bits to the above values.) notes: the t1 and t2 pins (pins 7 and 8) are related to test mode as follows: the t1 pin must be tied to v ss (0 v). initial values: ct0 = 0, ct1 = 0 pin t1 pin t2 ic operation notes 0 0 normal operating mode these states are user settable 0 1 standby mode (crystal oscillator stopped) 1 0/1 ic test mode users cannot use this state (11) circuit control (2 bits): ct0 and ct1 rdcl/rdda/rsft and error/correc/sync output timing timing 1 (modes 1 to 3, pt2 = 0) timing 2 (mode 3, pt2 = 0) item control ct0 rsft control when set to 1, soft-decision control data (rsft) is easier to generate. ct1 rds-id detection condition when set to 1, the rds-id detection conditions are made more restrictive. tp1 421 s 421 s 842 s 421 s a13210 a13211 tp1 tp1 rdcl output rdda output rsft output input data error crrection sync output error output correc output sync ng sync ng sync ng sync ok sync ok sync ok sync ok sync ok data corrected data corrected no errors no errors uncorrectable uncorrectable note: when pt2 = 0, rdda and rsft must be aquired on the falling edge of rdcl. www.datasheet.co.kr datasheet pdf - http://www..net/
serial data input and output methods data is input and output using the ccb (computer control bus), which is the sanyo audio ic serial bus format. this ic adopts an 8-bit address ccb format. serial data input (in1, in2) t su , t hd , t el , t es , t eh 0.75 s t lc < 1.15 s t ce < 20 ms cl: normal high cl: normal low no. 6488-11/14 lc72720y, 72720YV i/o mode (lsb) address (msb) comment b0 b1 b2 b3 a0 a1 a2 a3 1 in1 (6a) 01010110 control data input mode, also referred to as ?serial data input? mode. this is a 16-bit data input mode. 2 in2 (6b) 11010110 control data input mode, also referred to as ?serial data input? mode. this is a 16-bit data input mode. 3 out (6c) 00110110 data output mode, also referred to as ?serial data output? mode. the data for multiple blocks can be output sequentially in this mode. ce cl di do b0 b1 b2 b3 a0 a1 a2 a3 first data in1/2 first data out first data out a13212 1 2 1 2 t su t hd t el t es t eh t lc t ce b0 b1 b2 b3 a0 a1 a2 a3 fs0 ct1 fs1 0 fs2 0 fs3 0 ec3 ts0 ec4 ts1 ct0 ts2 0 ts3 ce cl di a13213 t su t hd t el t es t eh t lc t ce b0 b1 b2 b3 a0 a1 a2 a3 fs1 0 fs0 ct1 fs2 0 fs3 0 ec3 ts0 ec4 ts1 ct0 ts2 0 ts3 ce cl di a13214 i/o mode determined ? for the cl normal high state ? for the cl normal low state internal data internal data www.datasheet.co.kr datasheet pdf - http://www..net/
no. 6488-12/14 lc72720y, 72720YV serial data output (out) t su , t hd , t el , t es , t eh 0.75 s t dc , t dh < 0.46 s t ce < 20 ms cl: normal high cl: normal low serial data timing cl: normal high cl: normal low caution: 1. since the do pin is an n-channel open-drain output, the transition times (t dc , t dh ) will differ according to the value of the pull-up resistor used. 2. the ce, cl, di, and do pins can be connected to the corresponding pins on other ics that use the ccb interface. (however, we recommend connecting the do and ce pins separately if the number of available microcontroller ports allows it.) 3. serial data i/o becomes possible after the crystal oscillator starts oscillation. t su t hd t el t es t eh t dc t dc t ce b0 b1 b2 b3 a0 a1 a2 a3 1010 d3d2d1d0 ce cl di do a13215 t dh t su t hd t dc t dc b0 b1 b2 b3 a0 a1 a2 a3 1010 d3d2d1d0 ce cl di do a13216 t dh t el t es t eh t ce t ce v ih v il v ih v il t eh t dh t lc t es t dc t el t cl t ch t su t hd v ih v il v ih v il v ih v il v ih ce cl di do a13217 t ce v ih v il v il v ih v il t eh t dh t lc t es t dc t dc t el t cl t ch t su t hd v ih v il v ih v il v ih v il v il ce cl di do a13218 intenal data latch intenal data latch old old new new www.datasheet.co.kr datasheet pdf - http://www..net/
parameter symbol conditions ratings unit min typ max data setup time t su di, cl 0.75 s data hold time t hd di, cl 0.75 s clock low-level time t cl cl 0.75 s clock high-level time t ch cl 0.75 s ce wait time t el ce, cl 0.75 s ce setup time t es ce, cl 0.75 s ce hold time t eh ce, cl 0.75 s ce high-level time t ce ce 20 ms data latch transition time t lc 1.15 s data output time t dc do, cl 0.46 s t dh do, ce 0.46 s no. 6488-13/14 lc72720y, 72720YV differs with the value of the pull-up resistor used. do pin operation this ic incorporates a ram data buffer that can hold up to 24 blocks of data. at the point where one block of data is written to this ram, the ic issues a read request by switching the do pin from high to low. the do pin always goes high for a fixed period (tdo = 265 s) after a readout and ce goes low. when all the data in the data buffer has been read out, the do pin is held in the high state until a new block of data has been written to the ram. if there is data that has not yet been read remaining in the data buffer, the do pin goes low after the tdo time has elapsed. after a synchronization reset, the do pin is held high until synchronization is established. it goes low at the point where the ic synchronizes. 1. when the do pin is high following the 265 s period (tdo) after data is read out here, the buffer is in the empty state, i.e. the state where new data has not been written. after this, when the do pin goes low, applications are guaranteed to be able to read out that data without it being overwritten by new data if they start a readout operation within 480 ms of do going low. 2. when do goes low 265 s after data is read out here, there is data that has not been read out remaining in the data buffer. in this case, applications are guaranteed to be able to read out that data without it being overwritten by new data if they start a readout operation within 20 ms of do going low. (note that this is the worst case condition.) notes: 1. although an application can determine whether or not there is data remaining in the buffer by checking the do level with the above timing, checking the re and rf flags in the serial data is a preferable method. 2. applications are not limited to reading out one block of data at a time, but rather can read out multiple blocks of data continuously as described above. when using this method, if an application references the re and rf flags in the data while reading out data, it can determine the amount of data remaining. however, the length of the period for data readout (the period the ce pin remains high) must be kept under 20 ms. 3. if the do pin is shared with other ics that use the ccb interface, the application must identify which ic issued the readout request. one method is to read out data from the lc72720y and either check whether meaningful data has been read (if the lc72720y is not requesting a read, data consisting of all zeros will be read out) or check whether the do level goes low within the 265 s following the completion of the read (if the do pin goes low, then the request was from another ic). t tdo a13219 t tdo a13220 ce pin do pin ce pin do pin (last data) - 1 last data new data (last data) - 2 (last data) - 1 last data do check (tdo < t) do check (tdo < t) www.datasheet.co.kr datasheet pdf - http://www..net/
ps no. 6488-14/14 lc72720y, 72720YV sample application circuit (lc72720y) notes: 1. determine the value of the do pin pull-up resistor based on the required serial data transfer speed. 2. a 100-k bias resistor must be connected between the cin pin and the vref pin. 3. if the syr pin is unused, it must be connected to ground. + 124 v ref syr syr 223 mpxin ce 322 vdda di 421 vssa cl 520 flout do 619 cin rds-id 718 t1 sync 12 13 x out x in 10 f mpxin vdda vssa 8 t2 vssd 9 t3 nc nc nc nc nc 10 t4 11 t5 vssd vssd 330pf 560pf 16pf 16pf 17 t7 16 t6 vssd vssd vddd 0.1 f 15 vssd 14 vddd 0.1 f vssa 4.332mhz di ce cl do vddd 10k vddd 10k rds-id sync vddd 10k 100k a13221 specifications of any and all sanyo products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer?s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer?s products or equipment. sanyo electric co., ltd. strives to supply high-quality high-reliability products. however, any and all semiconductor products fail with some probability. it is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo products (including technical data, services) described or contained herein are contr olled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of sanyo electric co., ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equipment, refer to the ?delivery specification? for the sanyo product that you intend to use. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. this catalog provides information as of april, 2000. specifications and information herein are subject to change without notice. www.datasheet.co.kr datasheet pdf - http://www..net/

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