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* other brands and names are the property of their respective owners. information in this document is provided in connection with intel products. intel assumes no liability whatsoever, including infringement of any patent or copyright, for sale and use of intel products except as provided in intel's terms and conditions of sale for such products. intel retains the right to make changes to these specifications at any time, without notice. microcomputer products may have minor variations to this specification known as errata. december 1995 copyright ? intel corporation, 1995 order number: 272250-006 82527 serial communications controller controller area network protocol automotive y supports can specification 2.0 e standard data and remote frames e extended data and remote frames y programmable global mask e standard message ldentifier e extended message ldentifier y 15 message objects of 8-byte data length e 14 tx/rx buffers e 1 rx buffer with programmable mask y flexible cpu interface e 8-bit multiplexed e 16-bit multiplexed e 8-bit non-multiplexed (synchronous/asynchronous) e serial interface y programmable bit rate y programmable clock output y flexible interrupt structure y flexible status interface y configurable output driver y configurable input comparator y two 8-bit bidirectional i/o ports y 44-lead plcc package y 44-lead qfp package y pinout compatibility with the 82526 the 82527 serial communications controller is a highly integrated device that performs serial communication according to the can protocol. it performs all serial communication functions such as transmission and reception of messages, message filtering, transmit search, and interrupt search with minimal interaction from the host microcontroller, or cpu. the 82527 is intel's first device to support the standard and extended message frames in can specification 2.0 part b. it has the capability to transmit, receive, and perform message filtering on extended message frames. due to the backwardly compatible nature of can specification 2.0, the 82527 also fully supports the standard message frames in can specification 2.0 part a. the 82527 features a powerful cpu interface that offers flexibility to directly interface to many different cpus. it can be configured to interface with cpus using an 8-bit multiplexed, 16-bit multiplexed, or 8-bit non-multi- plexed address/data bus for intel and non-intel architectures. a flexible serial interface (spi) is also available when a parallel cpu interface is not required. the 82527 provides storage for 15 message objects of 8-byte data length. each message object can be configured as either transmit or receive except for the last message object. the last message object is a receive-only buffer with a special mask design to allow select groups of different message identifiers to be received. the 82527 also implements a global masking feature for message filtering. this feature allows the user to globally mask any identifier bits of the incoming message. the programmable global mask can be used for both standard and extended messages. the 82527 plcc offers hardware, or pinout, compatibility with the 82526. it is pin-to-pin compatible with the 82526 except for pins 9, 30, and 44. these pins are used as chip selects on the 82526 and are used as cpu interface mode selection pins on the 82527. the 82527 is fabricated using intel's reliable chmos iii 5v technology and is available in either 44-lead plcc or 44-lead qfp for the automotive temperature range ( b 40 cto a 125 c).
82527 272250 1 figure 1. 82527 block diagram 272250 2 figure 2. 44-pin plcc package 2
82527 272250 15 figure 3. 44-pin qfp package 3
82527 pin description the 82527 pins are described in this section. table 1 presents the legend for interpreting the pin types. table 1. pin type legend symbol description i input only pin o output only pin i/o pin can be either input or output pin descriptions pin name pin type pin description v ss1 ground ground connection must be connected externally to a v ss board plane. provides digital ground. v ss2 ground ground connection must be connected externally to a v ss board plane. provides ground for analog comparator. v cc power power connection must be connected externally to a 5v dc. provides power for entire device. xtal1 i input for an external clock. xtal1 (along with xtal2) are the crystal connections to an internal oscillator. xtal2 o push-pull output from the internal oscillator. xtal2 (along with xtal1) are the crystal connections to an internal oscillator. if an external oscillator is used xtal2 must be floated, or not be connected. xtal2 must not be used as a clock output to drive other cpus. clkout o programmable clock output. this output may be used to drive the oscillator of the host microcontroller. reset y i warm reset: (v cc remains valid while reset y is asserted), reset y must be driven to a valid low level for 1 ms minimum. cold reset: (v cc is driven to a valid level while reset y is asserted), reset y must be driven low for 1 ms minimum measured from a valid v cc level. no falling edge on the reset pin is required during a cold reset event. cs y i a low level on this pin enables cpu access to the 82527 device. int y o the interrupt pin is an open-drain output to the host microcontroller. v cc /2 is the power supply for the iso low speed physical layer. the function of this pin is (v cc /2) o determined by the mux bit in the cpu interface register (address 02h) as follows: mux e 1: pin 24 (plcc) e v cc /2, pin 11 e int y mux e 0: pin 24 (plcc) e int y rx0 i inputs from the can bus line(s) to the input comparator. a recessive level is read when rx0 l rx1. a dominant level is read when rx1 l rx0. when the rx1 i coby bit (bus configuration register) is programmed as a ``1'', the input comparator is bypassed and rx0 is the can bus line input. tx0 o serial data push-pull output to the can bus line. during a recessive bit tx0 is high and tx1 is low. during a dominant bit tx0 is low and tx1 is high. tx1 o 4
82527 pin name pin type pin description ad0/a0/icp i/o-i-i address/data bus in 8-bit multiplexed mode. ad1/a1/cp i/o-i-i address bus in 8-bit non-multiplexed mode. ad2/a2/csas i/o-i-i low byte of a/d bus in 16-bit multiplexed mode. ad3/a3/ste i/o-i in serial interface mode, the following pins have the following meaning: ad4/a4/mosi i/o-i-i ad0: icp idle clock polarity ad5/a5 i/o-i ad1: cp clock phase ad6/a6/sclk i/o-i-i ad2: csas chip select active state ad7/a7 i/o-i ad3: ste sync transmit enable ad6: sclk serial clock input ad4: mosi serial data input ad8/d0/p1.0 i/o-o-i/o high byte of a/d bus in 16-bit multiplexed mode. ad9/d1/p1.1 i/o-o-i/o data bus in 8-bit non-multiplexed mode. ad10/d2/p1.2 i/o-o-i/o low speed i/o port. p1 pins in 8-bit multiplexed mode and serial mode. port pins have weak pullups until the port is configured by writing to 9fh ad11/d3/p1.3 i/o-o-i/o and afh. ad12/d4/p1.4 i/o-o-i/o ad13/d5/p1.5 i/o-o-i/o ad14/d6/p1.6 i/o-o-i/o ad15/d7/p1.7 i/o-o-i/o p2.0 i/o p2 in all modes. p2.1 i/o p2.6 is int y when mux e 1 and is open-drain. p2.2 i/o p2.7 is wrh y in 16-bit multiplexed mode. p2.3 i/o p2.4 i/o p2.5 i/o p2.6/int y i/o-o p2.7/wrh y i/o-i mode0 i these pins select one of the four parallel interfaces. these pins are weakly held low during reset. mode1 i mode1 mode0 0 0 8-bit multiplexed e intel 0 0 serial interface mode entered when rd y e 0, wr y e 0 upon reset. 0 1 16-bit multiplexed e intel 1 0 8-bit multiplexed e non-intel 1 1 8-bit non-multiplexed ale/as i-i ale used for intel modes. as used for non-intel modes, except mode 3 this pin must be tied high. rd y ird y used for intel modes. e i e used for non-intel modes, except mode 3 asynchronous this pin must be tied high. wr y /wrl y iwr y in 8-bit intel mode and wrl y in 16-bit intel mode. r/w y i r/w y used for non-intel modes. ready o ready is an output to synchronize accesses from the host microcontroller to the 82527. ready is an open-drain output to the host miso o microcontroller. miso is the serial data output for the serial interface mode. dsack0 y o dsack0 y is an open-drain output to synchronize accesses from the host microcontroller to the 82527. 5
82527 electrical characteristics absolute maximum ratings * storage temperature b 60 cto a 150 c voltage from any pin to v ss b 0.5v to a 7.0v laboratory testing shows the 82527 will withstand up to 10 ma of injected current into both rx0 and rx1 pins for a total of 20 days without sustaining permanent damage. this high current condition may be the result of shorted signal lines. the 82527 will not function properly if the rx0/rx1 input voltage exceeds v cc a 0.5v. notice: this is a production data sheet. the specifi- cations are subject to change without notice. * warning: stressing the device beyond the ``absolute maximum ratings'' may cause permanent damage. these are stress ratings only. operation beyond the ``operating conditions'' is not recommended and ex- tended exposure beyond the ``operating conditions'' may affect device reliability. d.c. characteristics v cc e 5v g 10%; t a eb 40 cto a 125 c symbol parameter min max conditions v il input low voltage (all except rx0, rx1, b 0.5v 0.8v ad0 ad7 in mode 3) v il1 input low voltage for ad0 ad7 in b 0.5v 0.5v mode 3 v il2 input low voltage (rx0) for comparator 0.5v bypass mode v il3 input low voltage for port 1 and port 2 0.3 v cc pins not used for interface to host cpu v ih input high voltage (all except rx0, rx1, 3.0v v cc a 0.5v reset y ) v ih1 input high voltage (reset y ) 3.0v v cc a 0.5v hysteresis on reset y 200 mv v ih2 input high voltage (rx0) for comparator 4.0v bypass mode v ih3 input high voltage for port 1 and port 2 0.7 v cc pins not used for interface to host cpu v ol output low voltage (all outputs except 0.45v i ol e 1.6 ma tx0, tx1) v oh output high voltage (all outputs except v cc b 0.8v i oh eb 200 m a tx0, tx1, clockout) v ohr1 output high voltage (clockout) 0.8 v cc i oh eb 80 m a i lk input leakage current g 10 m av ss k v in k v cc c in pin capacitance ** 10 pf f xtal e 1 khz 6
82527 d.c. characteristics v cc e 5v g 10%; t a eb 40 cto a 125 c symbol parameter min max conditions i cc supply current (1) 50 ma f xtal e 16 mhz i sleep sleep current (1) with v cc /2 output enabled, no load 700 m a with v cc /2 output disabled 100 m a i pd powerdown current (1) 25 m a xtal1 clocked notes: ** typical value based on characterization data. port pins are weakly held after reset until the port configuration registers are written (9fh, afh). 1. all pins are driven to v ss or v cc including rx0 and rx1. physical layer specifications load condition: 100 pf d.c. characteristics v cc e 5v g 10%; t a eb 40 cto a 125 c rx0/rx1 and tx0/tx1 min max conditions input voltage b 0.5v v cc a 0.5v common mode range v ss a 1v v cc b 1v differential input threshold g 100 mv internal delay 1: sum of the comparator input 60 ns load on tx0, tx1 e delay and the tx0/tx1 output driver delay 100 pf, a 100 mv to b 100 mv rx0/rx1 differential internal delay 2: sum of the rx0 pin delay (if 50 ns load on tx0, tx1 e the comparator is bypassed) and the tx0/tx1 100 pf output driver delay source current on each tx0, tx1 b 10 ma v out e v cc b 1.0v sink current on each tx0, tx1 10 ma v out e 1.0v input hysteresis for rx0/rx1 0v v cc /2 v cc /2 2.38v 2.62v i out s 75 m a, v cc e 5v clockout specifications load condition: 50 pf parameter min max clockout frequency xtal/15 xtal 7
82527 a.c. characteristics for 8/16-bit multiplexed intel modes (modes 0, 1) conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf symbol parameter min max conditions 1/t xtal oscillator frequency 8 mhz 16 mhz 1/t sclk system clock frequency 4 mhz 10 mhz 1/t mclk memory clock frequency 2 mhz 8 mhz t avll address valid to ale low 7.5 ns t llax address hold after ale low 10 ns t lhll ale high time 30 ns t llrl ale low to rd y low 20 ns t clll cs y low to ale low 10 ns t qvwh data setup to wr y high 27 ns t whqx input data hold after wr y high 10 ns t wlwh wr y pulse width 30 ns t whlh wr y high to next ale high 8 ns t whch wr y high to cs y high 0 ns t rlrh rd y pulse width 40 ns this time is long enough to initiate a double read cycle by loading the high speed registers (04h, 05h), but is too short to read from 04h and 05h (see t rldv ) t rldv rd y low to data valid 0 ns 55 ns (only for registers 02h, 04h, 05h) t rldv1 rd y low data to data valid (for registers except 02h, 04h, 05h) for read cycle without a previous write (1) 1.5 t mclk a 100 ns for read cycle with a previous write (1) 3.5 t mclk a 100 ns t rhdz data float after rd y high 0 ns 45 ns t clyv cs y low to ready setup 32 ns v ol e 1.0v condition: load capacitance on the ready 40 ns v ol e 0.45v output: 50 pf t wlyz wr y low to ready float for a write cycle 145 ns if no previous write is pending (2) t whyz end of last write to ready float for a write 2 t mclk a 100 ns cycle if a previous write cycle is active (2) t rlyz rd y low to ready float (for registers except 02h, 04h, 05h) for read cycle without a previous write (1) 2t mclk a 100 ns for read cycle with a previous write (1) 4t mclk a 100 ns 8
82527 a.c. characteristics for 8/16-bit multiplexed intel modes (modes 0, 1) conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf (continued) symbol parameter min max conditions t whdv wr y high to output data valid t mclk 2t mclk a 500 ns on port 1/2 t copo clkout period (cd v a 1) * t osc (3) t chcl clkout high period (cd v a 1) * (/2 t osc b 10 (cd v a 1) * (/2 t osc a 15 notes: references to wr y also pertain to wrh y . 1. definition of ``read cycle without a previous write'': the time between the rising edge of wr y /wrh y (for the previous write cycle) and the falling edge of rd y (for the current read cycle) is greater than 2 t mclk . 2. definition of ``write cycle with a previous write'': the time between the rising edge of wr y /wrh y (for the previous write cycle) and the rising edge of wr y /wrh y (for the current write cycle) is less than 2 t mclk . 3. definition of cd v is the value loaded in the clkout register representing the clkout divisor. a.c. characteristics for 8/16-bit multiplexed intel modes (modes 0, 1) 272250 3 9
82527 a.c. characteristics for 8/16-bit multiplexed intel modes (modes 0, 1) ready output timing for a write cycle if no previous write is pending 272250 4 ready output timing for a write cycle if a previous write cycle is active 272250 5 ready output timing for a read cycle 272250 6 10
82527 a.c. characteristics for 8-bit multiplexed non-intel mode (mode 2) conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf symbol parameter min max 1/t xtal oscillator frequency 8 mhz 16 mhz 1/t sclk system clock frequency 4 mhz 10 mhz 1/t mclk memory clock frequency 2 mhz 8 mhz t avsl address valid to as low 7.5 ns t slax address hold after as low 10 ns t eldz data float after e low 0 ns 45 ns t ehdv e high to data valid for registers 02h, 0 ns 45 ns 04h, 05h for read cycle without a previous write (1) 1.5 t mclk a 100 ns for read cycle with a previous write 3.5 t mclk a 100 ns (for registers except for 02h, 04h, 05h) t qvel data setup to e low 30 ns t elqx input data hold after e low 20 ns t eldv e low to output data valid on port 1/2 t mclk 2t mclk a 500 ns t ehel e high time 45 ns t elel end of previous write (last e low) to e 2 t mclk low for a write cycle t shsl as high time 30 ns t rseh setup time of r/w y to e high 30 ns t sleh as low to e high 20 ns t clsl cs y low to as low 20 ns t elch e low to cs y high 0 ns t copd clkout period (cd v a 1) * t osc (3) t chcl clkout high period (cd v a 1) * (/2 t osc b 10 (cd v a 1) * (/2 t osc a 15 notes: 1. definition of ``read cycle without a previous write'': the time between the falling edge of e (for the previous write cycle) and the rising edge of e (for the current read cycle) is greater than 2 t mclk . 2. definition of ``write cycle with a previous write'': the time between the falling edge of e (for the previous write cycle) and the falling edge of e (for the current write cycle) is less than 2 t mclk . 3. definition of cd v is the value loaded in the clkout register representing the clkout divisor. 11
82527 a.c. characteristics for 8-bit multiplexed non-intel mode (mode 2) 272250 7 12
82527 a.c. characteristics for 8-bit non-multiplexed asynchronous (mode 3) conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf symbol parameter min max 1/t xtal oscillator frequency 8 mhz 16 mhz 1/t sclk system clock frequency 4 mhz 10 mhz 1/t mclk memory clock frequency 2 mhz 8 mhz t avcl address or r/w y valid to cs y low 3 ns setup t cldv cs y low to data valid 0 ns 55 ns for high speed registers (02h, 04h, 05h) for low speed registers 0 ns 1.5 t mclk a 100 ns (read cycle without previous write) (1) for low speed registers 0 ns 3.5 t mclk a 100 ns (read cycle with previous write) (1) t kldv dsack0 y low to output data valid 23 ns for high speed read register for low speed read register k 0ns t chdv 82527 input data hold after cs y high 15 ns t chdh 82527 output data hold after cs y high 0 ns t chdz cs y high to output data float 35 ns t chkh 1 cs y high to dsack0 y e 2.4v (3) 0ns 55ns t chkh 2 cs y high to dsack0 y e 2.8v 150 ns t chkz cs y high to dsack0 y float 0 ns 100 ns t chcl cs y width between successive cycles 25 ns t chai cs y high to address invalid 7 ns t chri cs y high to r/w y invalid 5 ns t clch cs y width low 65 ns t dvch cpu write data valid to cs y high 20 ns t clkl cs y low to dsack0 y low 0ns 67ns for high speed registers and low speed registers write access without previous write (2) t chkl end of previous write (cs y high) to 0 ns 2 t mclk a 145 ns dsack0 y low for a write cycle with a previous write (2) t copd clkout period (cd v a 1) * t osc (4) t chcl clkout high period (cd v a 1) * (/2 t osc b 10 (cd v a 1) * (/2 t osc a 15 notes: e and as must be tied high in this mode. 1. definition of ``read cycle without a previous write'': the time between the rising edge of cs y (for the previous write cycle) and the falling edge of cs y (for the current read cycle) is greater than 2 t mclk . 2. definition of ``write cycle without a previous write'': the time between the rising edge of cs y (for the previous write cycle) and the rising edge of cs y (for the current write cycle) is greater than 2 t mclk . 3. an on-chip pullup will drive dsack0 y to approximately 2.4v. an external pullup is required to drive this signal to a higher voltage. 4. definition of cd v is the value loaded in the clkout register representing the clkout divisor. 13
82527 a.c. characteristics for 8-bit non-multiplexed asynchronous mode (mode 3) timing of the asynchronous mode (read cycle) 272250 10 a.c. characteristics for 8-bit non-multiplexed asynchronous mode (mode 3) timing of the asynchronous mode (write cycle) 272250 11 14
82527 a.c. characteristics for 8-bit non-multiplexed synchronous mode (mode 3) conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf symbol parameter min max 1/t xtal oscillator frequency 8 mhz 16 mhz 1/t sclk system clock frequency 4 mhz 10 mhz 1/t mclk memory clock frequency 2 mhz 8 mhz t ehdv e high to data valid out of high speed 55 ns register (02h, 04h, 05h) read cycle without previous write for 1.5 t mclk a 100 ns low speed registers (1) read cycle with previous write for 3.5 t mclk a 100 ns low speed registers (1) t eldh data hold after e low for a read 5 ns cycle t eldz data float after e low 35 ns t eldv data hold after e low for a write cycle 15 ns t aveh address and r/w y to e setup 25 ns t elav address and r/w y valid after e falls 15 ns t cveh cs y valid to e high 0 ns t elcv cs y valid after e low 0 ns t dvel data setup to e low 55 ns t ehel e active width 100 ns t avav start of a write cycle after a previous 2 t mclk write access t avcl address or r/w y to cs y low setup 3 ns t chai cs y high to address invalid 7 ns t copd clkout period (cd v a 1) * t osc (2) t chcl clkout high period (cd v a 1) * (/2 t osc b 10 (cd v a 1) * (/2 t osc a 15 notes: 1. definition of ``read cycle without a previous write'': the time between the falling edge of e (for the previous write cycle) and the rising edge of e (for the current read cycle) is greater than 2 t mclk . 2. definition of cd v is the value loaded in the clkout register representing the clkout divisor. 15
82527 a.c. characteristics for 8-bit non-multiplexed synchronous mode (mode 3) timing of the synchronous mode (read cycle) 272250 8 a.c. characteristics for 8-bit non-multiplexed synchronous mode (mode 3) timing of the synchronous mode (write cycle) 272250 9 16
82527 a.c. characteristics for serial interface mode conditions: v cc e 5v g 10%, v ss e 0v, t a eb 40 cto a 125 c, c l e 100 pf symbol parameter min max sclk spi clock 0.5 mhz 8 mhz t cyc 1/sclk 125 ns 2000 ns t skhi minimum clock high time 84 ns t sklo minimum clock low time 84 ns t lead enable lead time 70 ns t lag enable lag time 109 ns t acc access time 60 ns t pdo maximum data out delay time 59 ns t ho minimum data out hold time 0 ns t dis maximum data out disable time 665 ns t setup minimum data setup time 35 ns t hold minimum data hold time 84 ns t rise maximum time for input to go 100 ns from v ol to v oh t fall maximum time for input to go 100 ns from v oh to v ol t cs minimum time between 670 ns consecutive cs y assertions t copd clkout period (cd v a 1) * t osc (1) t chcl clkout high period (cd v a 1) * (/2 t osc b 10 (cd v a 1) * (/2 t osc a 15 note: 1. definition of cd v is the value loaded in the clkout register representing the clkout divisor. 17
82527 a.c. characteristics for serial interface mode 272250 12 272250 13 a.c. testing input input, output waveforms 272250 14 note: ac inputs during testing are driven at v cc b 0.5v for a logic ``1'' and 0.1v for a logic ``0''. timing measure- ments are made at v oh min for a logic ``1'' and v ol max for a logic ``0''. data sheet revision history this is the -006 revision of the 82527 data sheet. the following differences exist between the -005 version and the -006 revision. there were no specifi- cation changes between the -004 version and the -005 revision. 1. the 82527 44-ld qfp was added to the product description, the pinmap for the qfp package is also included. 2. the pin numbers were removed from the pin de- scription list to accommodate the new 44-ld qfp package. 18
82527 3. removed xtal1 and xtal2 from the excep- tions for v il spec. xtal1 v il is now specified at min eb 0.5v, max e 0.8v. xtal2 is an output. 4. removed xtal1 and xtal2 from the excep- tions for v ih spec. xtal1 v ih is now specified at min e 3.0v, max e v cc a 0.5v. xtal2 is an output. 5. source and sink current for tx0 and tx1 were corrected from minimum values to maximum val- ues. 6. mode 2; the t avsl specification was decreased to 7.5 ns from 33 ns. 7. mode 2; the t slax specification was decreased to 10 ns from 20 ns. 8. mode 3, asynchronous; the t dvch specification was decreased to 20 ns from 32 ns. 9. all modes; two specifications were added for clkout. these specifications are t copd (clkout period) e (cd v a 1) * t osc , and t chcl (clkout high period) e min (cd v a 1) * (/2 t osc b 10 ns and max (cd v a 1) * (/2 t osc a 15 ns. note: cd v represented the value loaded in the lower nibble of the clkout register (1fh). 10. serial interface mode; the maximum sclk (spi clock) rate was increased to 8 mhz from 4.2 mhz. the minimum t cyc (1/sclk) was set at 125 ns from 238 ns to reflect the increased max- imum spi clock rate. 11. mode0/1, the t whqx specifications was de- creased to 10 ns from 12.5 ns. this is the -004 revision of the 82527 data sheet. the following differences exist between the -003 version and the -004 revision. 1. remove notice on page 1 concerning advance information data sheet. 2. page 4, as pin description, add ``pin tied high in asycnhronous mode 3''. 3. page 4, e pin description, add ``pin tied high in mode 3''. 4. page 5, add v ih e 0.7 v cc and v il e 0.3 v cc for lsio port pins (pins not used to interface to host-cpu). 5. page 6, change differential input threshold from max spec to min spec. 6. page 6, add input hysteresis spec for rx0/rx1 e 0v maximum. 7. page 7, t llax decreased from 20 ns to 10 ns (to interface to 20 mhz c196). 8. page 7, t qvwh decreased from 30 ns to 27 ns (to interface to 20 mhz c196). 9. page 7, t wlwh decreased from 40 ns to 30 ns (to interface to 20 mhz c196). 10. page 7, t rldv increased from 45 ns to 55 ns. 11. page 12, t chkh specification added for v ih e 2.8v e 150 ns. 12. page 12, t chai decreased from 10 ns to 7 ns. 13. page 13, timing diagram for t avcl revised to show common cl low level. 14. page 14, t chai decreased from 10 ns to 7 ns. 19
82527 15. page 7, t clll decreased from 20 ns to 10 ns. 16. page 3, reset y description addition: warm reset: (v cc remains valid while reset y is asserted), reset y must be driven to a valid low level for 1 ms minimum. cold reset: (v cc is driven to a valid level while reset y is asserted, reset y must be driven low for 1 ms minimum measured from a valid v cc level. no falling edge on the reset pin is required during a cold reset event. 17. page 2, figure 2: pin 7 name changed to (wr y /wrl y )/(r/w y ) from wr y /(r/w y ). 18. page 4, pin description name changed to (wr y /wrl y )/(r/w y ) from wr y /(r/w y ) and wr y in 8-bit intel mode and wrl y in 16-bit intel mode replaces the description wr y used for intel modes. 19. page 5, absolute maximum ratings addi- tion: laboratory testing shows the 82527 will withstand up to 10 ma for injected current into both rx0 and rx1 pins for a total of 20 days without sustaining permanent damage. this high current condition may be the result of shorted signal lines. the 82527 will not function properly if the rx0/rx1 input voltage exceeds v cc a 0.5v. 20. page 12, t chdv decreased from 25 ns to 15 ns. 21. page 14, t eldv decreased from 25 ns to 15 ns. 22. page 7, t avll decreased from 20 ns to 7.5 ns. 23. page 7, t whqx decreased from 20 ns to 12.5 ns. this is the -003 revision of the 82527 data sheet. the following differences exist between the -002 version and the -003 revision. 1. the data sheet has been revised to advance from preliminary, indicating the specifica- tions have been verified through electrical tests. 2. absolute maximum ratings have been added. 3. v il no longer applies to the ad0 ad7 pins in cpu interface mode 3. 4. v il1 has been added to specify input low volt- age for ad0 ad7 pins in cpu interface mode 3 as b 0.5v minimum and a 0.5v maximum. 5. i cc supply current has been reduced to 50 ma from 100 ma. 6. note 2 was added stating during i pd testing, all pins are driven to v ss or v cc , including rx0 and rx1. 7. t avll has been decreased to 20 ns from 33 ns. 8. t rldv1 has been decreased to 1.5 t mclk a 100 ns from 2 t mclk a 100 ns for a read cycle without a previous write (modes 0, 1). t rldv1 has been decreased to 3.5 t mclk a 100 ns from 4 t mclk a 100 ns for a read cycle with a previous write (modes 0, 1). 9. t clyv has added the condition of v ol e 1.0v for a 32 ns delay. t clyv is 40 ns for v ol e 0.45 (modes 0, 1). 10. t whyz has been decreased to 2 t mclk a 100 ns from 2 t mclk a 145 ns (modes 0, 1). 11. t ehdv has been decreased to 1.5 t mclk a 100 ns from 2 t mclk a 100 ns for a read cycle without a previous write (mode 2). t ehdv has been decreased to 3.5 t mclk a 100 ns from 4 t mclk a 100 ns for a read cycle with a previous write (mode 2). 12. t elel has been decreased to 2 t mclk from 2t mclk a 145 ns (mode 2). 13. t cldv has been decreased to 55 ns from 65 ns (mode 3). 14. t chkh is specified for v ih e 2.4v, decreased from v ih e 3.0v. note 3 has been added which states an on-chip pullup will drive dsack0 y to approximately 2.4v. an external pullup is re- quired to drive this signal to a higher voltage (mode 3). 15. t chai has been increased to 10 ns from 5 ns. t chai no longer includes cs y high to r/w y invalid (mode 3). 16. t chri e 5 ns has been added to specify cs y high to r/w y invalid (mode 3). 17. t ehdv has been decreased to 55 ns from 65 ns for reads of the high speed registers (mode 3). 18. t ehdv has been decreased to 1.5 t mclk a 100 ns from 2 t mclk a 100 ns for a read cycle without a previous write (mode 3). t ehdv has been decreased to 3.5 t mclk a 100 ns from 4 t mclk a 100 ns for a read cycle with a previous write (mode 3). 19. the t aval specification name has been correct- ed to t avav (mode 3). 20. t chai has been increased to 10 ns from 5 ns (mode 3). 21. the input voltage in the a.c. testing input dia- gram have been revised to v cc b 0.5v from 3.0v (high level) and revised to 0.1v from 0.8v (low level). 20
82527 the following differences exist between the -001 version and the -002 revision. 1. the ram block in figure 1. 82527 block dia- gram was previously called dpram. 2. the int y /(v cc /2) pin in figure 2. 44-pin plcc package and in other descriptions was previ- ously called the int y /(v dd /2) pin. 3. the mode0 and mode1 pin descriptions were modified to include the following note: these pins are weakly held low during reset. 4. the dsack0 y pin description was changed to reflect an open-drain output. 5. v il1 for rx0 in comparator bypass mode was added. 6. v ih1 hysteresis on reset y was added. 7. v ih2 for rx0 in comparator bypass mode was added. 8. i sleep current with v cc /2 output enabled was corrected from 700 m a minimum to 700 m a maximum. 9. i sleep current with v cc /2 output disabled was corrected from 100 m a minimum to 100 m a maximum. 10. i pd current was changed from 10 m a minimum to 25 m a maximum. 11. the following note was added to the electrical characteristics: port pins are weakly held high after reset until the port configuration registers are written (9fh, afh). 12. the following d.c. characteristics specifica- tions have been removed and replaced by the internal delay 1 and internal delay 2 specifica- tions. these specifications reflect the produc- tion test methodology which requires these two delays to be tested together. a. delay dominant to recessive b. delay recessive to dominant c. input delay with comparator bypassed d. rise time e. fall time 13. the following a.c. characteristics for 8-bit/ 16-bit multiplexed intel modes (modes 0,1) have been changed: a. 1/t mclk has been increased to 8 mhz from 5 mhz. b. t llax has been decreased to 20 ns from 22.5 ns. c. t llrl has been increased to 20 ns from 0 ns. d. t clll has been added. e. t whlh has been increased to 8 ns from 0 ns. f. t whch has been added. g. t rldv1 has been added. h. t wlyh has been changed to t wlyz to reflect the ready pin is an open-drain output. i. t whyh has been changed to t whyz to re- flect the ready pin is an open-drain output. j. t rlyh has been changed to t rlyz to reflect the ready pin is an open-drain output. k. t whdv has been increased to 2 t mclk a 250 ns from 2 t mclk a 100 ns. l. the following note was added: references to wr y also pertain to wrh y . m. the following definition was added for a ``read cycle without a previous write'': the time between the rising edge of wr y / wrh y (for the previous write cycle) and the falling edge of rd y (for the current read cy- cle) is greater than 2 t mclk . n. the following definition was added for a ``write cycle with a previous write'': the time between the rising edge of wr y /wrh y (for the previous write cycle) and the next rising edge of wr y /wrh y (for the current write cycle) is less than 2 t mclk . 21
82527 14. the timing diagrams for 8-bit/16-bit multiplexed intel modes (modes 0,1) have been changed to show ale rising before cs y falls. 15. the following a.c. characteristics for 8-bit mul- tiplexed non-intel modes (modes 2) have been changed: a. 1/t mclk has been increased to 8 mhz from 5 mhz. b. t slax has been decreased to 20 ns from 22.5 ns. c. t evdv has been decreased to (2, 4) t mclk a 100 ns from (2, 4) t mclk a 145 ns. d. t eldv minimum has been decreased to t mclk from t mclk a 100 ns. e. t eldv maximum has been increased to 2t mclk a 500 ns from 2 t mclk a 100 ns. f. t ehel for registers except 02h, 04h, 05h has been renamed to t elel and the specifi- cation has been decreased to 2 t mclk a 145 ns from 4 t mclk a 145 ns. g. t sleh has been increased to 20 ns from 0 ns. h. t clsl has been added. i. t elch has been added. j. the following definition was added for a ``read cycle without a previous write'': the time between the falling edge of e (for the previous write cycle) and the rising edge of e (for the current read cycle) is greater than 2t mclk . k. the following definition was added for a ``write cycle with a previous write'': the time between the falling edge of e (for the previ- ous write cycle) and the next falling edge of e (for the current write cycle) is less than 2t mclk . 16. the following a.c. characteristics for 8-bit non- multiplexed asynchronous mode (mode 3) have been changed: a. 1/t mclk has been increased to 8 mhz from 5 mhz. b. t cldv has been decreased for low speed registers to (2, 4) t mclk a 100 ns from (2, 4) t mclk a 145 ns. c. t chkh comment ``with 3.3 k x pullup and 100 pf load'' has been removed since t chkh is tested with a current source. d. t clkl for a write access with a previous write has been renamed to t chkl . e. the note ``e and as must be tied high in this mode'' has been added. f. the following definition was added for a ``read cycle without a previous write'': the time between the rising edge of cs y (for the previous write cycle) and the falling edge of cs y (for the current read cycle) is great- er than 2 t mclk . g. the following definition was added for a ``write cycle with a previous write'': the time between the rising edge of cs y (for the pre- vious write cycle) and the next rising edge of cs y (for the current write cycle) is less than 2t mclk . 17. the following a.c. characteristics for 8-bit non- multiplexed synchronous mode (mode 3) have been changed: a. 1/t mclk has been increased to 8 mhz from 5 mhz. b. t eldz minimum has been removed. c. t avcl has been added. d. t chai has been added. e. the following definition was added for a ``read cycle without a previous write'': the time between the falling edge of e (for the previous write cycle) and the rising edge of e (for the current read cycle) is greater than 2t mclk . f. the following definition was added for a ``write cycle with a previous write'': the time between the falling edge of e (for the previ- ous write cycle) and the next falling edge of e (for the current write cycle) is less than 2t mclk . 18. the following a.c. characteristics for serial in- terface mode have been changed: a. t skhi has been decreased to 84 ns from 119 ns. b. t sklo has been decreased to 84 ns from 119 ns. c. t pdo has been decreased to 59 ns from 84 ns. d. t setup has been decreased to 35 ns from 59 ns. e. t hold has been decreased to 84 ns from 109 ns. 19. the note in the a.c. testing input diagram refer- enced v oh was previously named v ih . 22

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