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1 features ? low-voltage and standard-voltage operation ? 2.7 (v cc = 2.7v to 5.5v) ? 2.5 (v cc = 2.5v to 5.5v) 3-wire serial interface schmitt trigger, filtered inputs for noise suppression 2 mhz clock rate (5v) self-timed write cycle (10 ms max) high reliability ? endurance: 1 million write cycles ? data retention: 100 years automotive grade and extended temperature devices available 8-lead pdip and 8-lead jedec soic packages description the at93c46c provides 1024 bits of serial electrically-erasable programmable read only memory (eeprom) organized as 64 words of 16 bits each. the device is opti- mized for use in many industrial and co mmercial applications where low-power and low-voltage operation are essential. the at93c46c is available in space-saving 8- lead pdip and 8-lead jedec soic packages. the at93c46c is enabled through the chip select pin (cs) and accessed via a 3-wire serial interface consisting 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 out serially on the do pin. the write cycle is completely self-timed and no separate erase cycle is required before write. the write cycle is only enabled when the part is in the erase/write enable state. when cs is brought ?high? fol- lowing the initiation of a write cycle, the do pin outputs the ready/busy status of the part. the at93c46c is available in 2.7v to 5.5v and 2.5v to 5.5v versions. table 1. pin configurations pin name function cs chip select sk serial data clock di serial data input do serial data output gnd ground vcc power supply nc no connect dc don?t connect 3-wire serial eeprom 1k (64 x 16) at93c46c rev. 1122f?seepr?8/05 8-lead pdip 1 2 3 4 8 7 6 5 cs sk di do vcc dc nc gnd 8-lead soic 1 2 3 4 8 7 6 5 cs sk di do vcc dc nc gnd
2 at93c46c 1122f?seepr?8/05 figure 1. block diagram absolute maximum ratings* operating temperature.................................. -55 c to +125 c *notice: stresses beyond those listed under ?absolute maximum ratings? may cause permanent dam- age to the device. this is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. storage temperature ..................................... -65 c to +150 c voltage on any pin with respect to ground .....................................-1.0v to +7.0v maximum operating voltage .......................................... 6.25v dc output current........................................................ 5.0 ma
3 at93c46c 1122f?seepr?8/05 note: 1. this parameter is characterized and is not 100% tested. note: 1. v il min and v ih max are reference only and are not tested. table 2. pin capacitance (1) applicable over recommended operating range from t a = 25c, f = 1.0 mhz, v cc = +5.0v (unless otherwise noted) symbol test conditions max units conditions c out output capacitance (do) 5 pf v out = 0v c in input capacitance (cs, sk, di) 5 pf v in = 0v table 3. dc characteristics applicable over recommended operating range from: t ai = -40c to +85c, v cc = +2.5v to +5.5v, t ac = 0c to +70c, v cc = +2.5v to +5.5v (unless otherwise noted) symbol parameter test condition min typ max units v cc1 supply voltage 2.5 5.5 v v cc2 supply voltage 2.7 5.5 v v cc3 supply voltage 4.5 5.5 v i cc supply current v cc = 5.0v read at 1.0 mhz 0.5 2.0 ma write at 1.0 mhz 0.5 2.0 ma i sb1 standby current v cc = 2.5v cs = 0v 14.0 20.0 a i sb2 standby current v cc = 2.7v cs = 0v 14.0 20.0 a i sb3 standby current v cc = 5.0v cs = 0v 35.0 50.0 a i il input leakage v in = 0v to v cc 0.1 1.0 a i ol output leakage v in = 0v to v cc 0.1 1.0 a v il1 (1) v ih1 (1) input low voltage input high voltage 2.5v v cc 5.5v ? 0.6 v cc x 0.7 v cc x 0.3 v cc + 1 v v ol1 v oh1 output low voltage output high voltage 4.5v v cc 5.5v i ol = 2.1 ma 0.4 v i oh = ? 0.4 ma 2.4 v v ol2 v oh2 output low voltage output high voltage 2.5v v cc 2.7v i ol = 0.15 ma 0.2 v i oh = ? 100 av cc ? 0.2 v
4 at93c46c 1122f?seepr?8/05 note: 1. this parameter is characterized and is not 100% tested. table 4. ac characteristics applicable over recommended operating range from t a = ? 40c to + 85c, v cc = +2.5v to + 5.5v, cl = 1 ttl gate and 100 pf (unless otherwise noted) symbol parameter test condition min typ max units f sk sk clock frequency 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 0 0 0 2 1 0.5 mhz t skh sk high time 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t skl sk low time 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t cs minimum cs low time 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t css cs setup time relative to sk 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 50 50 100 ns t dis di setup time relative to sk 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 100 100 200 ns t csh cs hold time relative to sk 0 ns t dih di hold time relative to sk 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 100 100 200 ns t pd1 output delay to ?1? ac test 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t pd0 output delay to ?0? ac test 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t sv cs to status valid ac test 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 250 250 500 ns t df cs to do in high impedance ac test cs = v il 4.5v v cc 5.5v 2.7v v cc 5.5v 2.5v v cc 5.5v 100 100 200 ns t wp write cycle time 10 ms 4.5v v cc 5.5v 0.1 3 ms endurance (1) 5.0v, 25 c, page mode 1 m write cycle
5 at93c46c 1122f?seepr?8/05 functional description the at93c46c is accessed via a simple and versatile 3-wire serial communication interface. device operation is controlled by seven instructions issued by the host pro- cessor. a valid instruction starts with a rising edge of cs and consists of a start bit (logic ?1?) followed by the appropriate op code and the desired memory address location. read (read): the read (read) instruction contains the address code for the mem- ory 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 synchronized with the rising edges of serial clock sk. it should be noted that a dummy bit (logic ?0?) precedes the 16-bit data output string. erase/write (ewen): to assure data integrity, the part automatically goes into the erase/write disable (ewds) st ate when power is first applied. an erase/write 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 instruction is executed or v cc 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 starts once the erase instruction and address are decoded. the do pin outputs the ready/busy sta- tus of the part if cs is brought high after being kept low for a minimum of 250 ns (t cs ). a logic ?1? at pin do indicates that the selected memory location has been erased, and the part is ready for another instruction. write (write): the write (write) instruction contains the 16 bits of data to be writ- ten into the specified memory location. the self-timed programming cycle t wp 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 brou ght high after being kept low for a minimum of 250 ns (t cs ). a logic ?0? at do indicates that prog ramming is still in progress. a logic ?1? indicates that the memory location at the 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 self-timed programming cycle t wp . erase all (eral): the erase all (eral) instruction programs every bit in the mem- ory array to the logic ?1? state and is primarily used for testing purposes. 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 (t cs ). the eral instructio n is valid only at v cc = 5.0v 10%. table 5. instruction set for the at93c46c instruction sb op code address comments x 16 read 1 10 a 5 ? a 0 reads data stored in memory, at specified address ewen 1 00 11xxxx write enable must precede all programming modes erase 1 11 a 5 ? a 0 erase memory location a n ? a 0 write 1 01 a 5 ? a 0 writes memory location a n ? a 0 eral 1 00 10xxxx erases all memory locations. valid only at v cc = 4.5v to 5.5v wral 1 00 01xxxx writes all memory locations. valid only at v cc = 4.5v to 5.5v ewds 1 00 00xxxx disables all programming instructions
6 at93c46c 1122f?seepr?8/05 write all (wral): the write all (wral) instruction programs all memory locations with the data patterns specified in the instruction. 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 (t cs ). the wral instruction is valid only at v cc = 5.0v 10%. erase/write disable (ewds): to protect against accidental data disturb, the erase/write disable (ewds) instruction disables all programming modes and should be executed after all programming operations. the operation of the read instruction is independent of both the ewen and ewds instructions and can be executed at any time.
7 at93c46c 1122f?seepr?8/05 timing diagrams figure 2. synchronous data timing note: this is the minimum sk period.
8 at93c46c 1122f?seepr?8/05 figure 3. read timing figure 4. ewen timing (1) note: 1. requires a minimum of nine clock cycles. figure 5. ewds timing (1) note: 1. requires a minimum of nine clock cycles. table 6. organization key for timing diagrams i/o at93c46c x 16 a n a 5 d n d 15 high impedance t cs cs 11 ... 00 1 sk di t cs cs t cs sk di 1 0 000 ...
9 at93c46c 1122f?seepr?8/05 figure 6. write timing figure 7. wral timing (1)(2) notes: 1. valid only at v cc = 4.5v to 5.5v 2. requires a minimum of nine clock cycles. figure 8. erase timing sk cs t cs t wp 11 a n d n 0a0d0 ... ... di do high impedance busy ready cs sk di do high impedance busy ready 1 0 0 1 ... d n t cs t wp ... d0 0 sk 1 1 ... 1 cs di a n t cs t sv t df t wp a n-1 a n-2 a0 check status standby ready busy do high impedance high impedance
10 at93c46c 1122f?seepr?8/05 figure 9. eral timing (1) note: 1. valid only at v cc = 4.5v to 5.5v sk cs di 1 1 00 0 do high impedance high impedance ready busy check status standby t wp t cs t sv t df
11 at93c46c 1122f?seepr?8/05 note: for 2.7v and 2.5v devices used in th e 4.5v to 5.5v range, please refer to performance values in the ac and dc characterist ics table. ordering information ordering code package operation range at93c46c-10pi-2.7 at93c46c-10si-2.7 8p3 8s1 industrial ( ? 40 c to 85 c) at93c46c-10pi-2.5 at93c46c-10si-2.5 8p3 8s1 industrial (-40 c to 85 c) at93c46c-10su-2.7 8s1 lead-free/halogen-free industrial temperature (-40 c to 85 c) package type 8p3 8-lead, 0.300" wide, plastic dual inline package (pdip) 8s1 8-lead, 0.150" wide, plastic gull wing small outline (jedec soic) options ? 2.7 low voltage (2.7v to 5.5v) ? 2.5 low voltage (2.5v to 5.5v)
12 at93c46c 1122f?seepr?8/05 packaging information 8p3 ? pdip 2325 orchard parkway san jose, ca 95131 title drawing no. r rev. 8p3 , 8-lead, 0.300" wide body, plastic dual in-line package (pdip) 01/09/02 8p3 b d d1 e e1 e l b2 b a2 a 1 n ea c b3 4 plcs top view side view end view common dimensions (unit of measure = inches) symbol min nom max note notes: 1. this drawing is for general information only; refer to jedec drawing ms-001, variation ba for additional information. 2. dimensions a and l are measured with the package seated in jedec seating plane gauge gs-3. 3. d, d1 and e1 dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch. 4. e and ea measured with the leads constrained to be perpendicular to datum. 5. pointed or rounded lead tips are preferred to ease insertion. 6. b2 and b3 maximum dimensions do not include dambar protrusions. dambar protrusions shall not exceed 0.010 (0.25 mm). a 0.210 2 a2 0.115 0.130 0.195 b 0.014 0.018 0.022 5 b2 0.045 0.060 0.070 6 b3 0.030 0.039 0.045 6 c 0.008 0.010 0.014 d 0.355 0.365 0.400 3 d1 0.005 3 e 0.300 0.310 0.325 4 e1 0.240 0.250 0.280 3 e 0.100 bsc ea 0.300 bsc 4 l 0.115 0.130 0.150 2
13 at93c46c 1122f?seepr?8/05 8s1 ? jedec soic 1150 e. cheyenne mtn. blvd. colorado springs, co 80906 title drawing no. r rev. note: 10/7/03 8s1 , 8-lead (0.150" wide body), plastic gull wing small outline (jedec soic) 8s1 b common dimensions (unit of measure = mm) symbol min nom max note a1 0.10 ? 0.25 these drawings are for general information only. refer to jedec drawing ms-012, variation aa for proper dimensions, tolerances, datums, etc. a 1.35 ? 1.75 b 0.31 ? 0.51 c 0.17 ? 0.25 d 4.80 ? 5.00 e1 3.81 ? 3.99 e 5.79 ? 6.20 e 1.27 bsc l 0.40 ? 1.27 ? 0? ? 8? ? top view end view side view e b d a a1 n e 1 c e1 l
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