Features • Fast Read Access Time - 150 ns • Fast Byte Write - 200 µs or 1 ms • Self-Timed Byte Write Cycle • • • • • • • – Internal Address and Data Latches – Internal Control Timer – Automatic Clear Before Write Direct Microprocessor Control – DATA POLLING Low Power – 30 mA Active Current – 100 µA CMOS Standby Current High Reliability – Endurance: 104 or 105 Cycles – Data Retention: 10 Years 5V ± 10% Supply CMOS & TTL Compatible Inputs and Outputs JEDEC Approved Byte Wide Pinout Commercial and Industrial Temperature Ranges 16K (2K x 8) Parallel EEPROMs AT28C16 Description The AT28C16 is a low-power, high-performance Electrically Erasable and Programmable Read Only Memory with easy to use features. The AT28C16 is a 16K memory organized as 2,048 words by 8 bits. The device is manufactured with Atmel’s reliable (continued) nonvolatile CMOS technology. Pin Configurations Pin Name Function A0 - A10 Addresses CE Chip Enable OE Output Enable WE Write Enable I/O0 - I/O7 Data Inputs/Outputs NC No Connect DC Don’t Connect PDIP, SOIC Top View 29 28 27 26 25 24 23 22 21 14 15 16 17 18 19 20 5 6 7 8 9 10 11 12 13 A8 A9 NC NC OE A10 CE I/O7 I/O6 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC A8 A9 WE OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3 I/O1 I/O2 GND DC I/O3 I/O4 I/O5 A6 A5 A4 A3 A2 A1 A0 NC I/O0 4 3 2 1 32 31 30 A7 NC NC DC VCC WE NC PLCC Top View Note: PLCC package pins 1 and 17 are DON’T CONNECT. Rev. 0540B–10/98 1 The AT28C16 is accessed like a static RAM for the read or write cycles without the need of external components. During a byte write, the address and data are latched internally, freeing the microprocessor address and data bus for other operations. Following the initiation of a write cycle, the device will go to a busy state and automatically clear and write the latched data using an internal control timer. The end of a write cycle can be determined by DATA POLLING of I/O7. Once the end of a write cycle has been detected, a new access for a read or a write can begin. The CMOS technology offers fast access times of 150 ns at low power dissipation. When the chip is deselected the standby current is less than 100 µA. Atmel’s 28C16 has additional features to ensure high quality and manufacturability. The device utilizes error correction internally for extended endurance and for improved data retention characteristics. An extra 32 bytes of EEPROM are available for device identification or tracking. Block Diagram Absolute Maximum Ratings* Temperature Under Bias ................................ -55°C to +125°C Storage Temperature ..................................... -65°C to +150°C All Input Voltages (including NC Pins) with Respect to Ground ...................................-0.6V to +6.25V All Output Voltages with Respect to Ground .............................-0.6V to VCC + 0.6V Voltage on OE and A9 with Respect to Ground ...................................-0.6V to +13.5V 2 AT28C16 *NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage 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 AT28C16 Device Operation READ: The AT28C16 is accessed like a Static RAM. When CE and OE are low and WE is high, the data stored at the memory location determined by the address pins is asserted on the outputs. The outputs are put in a high impedance state whenever CE or OE is high. This dual line control gives designers increased flexibility in preventing bus contention. BYTE WRITE: Writing data into the AT28C16 is similar to writing into a Static RAM. A low pulse on the WE or CE input with OE high and CE or WE low (respectively) initiates a byte write. The address location is latched on the last falling edge of WE (or CE); the new data is latched on the first rising edge. Internally, the device performs a selfclear before write. Once a byte write has been started, it will automatically time itself to completion. Once a programming operation has been initiated and for the duration of tWC, a read operation will effectively be a polling operation. FAST BYTE WRITE: The AT28C16E offers a byte write time of 200 µs maximum. This feature allows the entire device to be rewritten in 0.4 seconds. DATA POLLING: The AT28C16 provides DATA POLLING to signal the completion of a write cycle. During a write cycle, an attempted read of the data being written results in the complement of that data for I/O7 (the other outputs are indeterminate). When the write cycle is finished, true data appears on all outputs. WRITE PROTECTION: Inadvertent writes to the device are protected against in the following ways: (a) V C C sense—if VCC is below 3.8V (typical) the write function is inhibited; (b) VCC power on delay—once VCC has reached 3.8V the device will automatically time out 5 ms (typical) before allowing a byte write; and (c) write inhibit—holding any one of OE low, CE high or WE high inhibits byte write cycles. CHIP CLEAR: The contents of the entire memory of the AT28C16 may be set to the high state by the CHIP CLEAR operation. By setting CE low and OE to 12 volts, the chip is cleared when a 10 msec low pulse is applied to WE. D E V I C E I DE NT I F I C A T I O N : A n e x t r a 3 2 b y t e s o f EEPROM memory are available to the user for device identification. By raising A9 to 12 ± 0.5V and using address locations 7E0H to 7FFH the additional bytes may be written to or read from in the same manner as the regular memory array. 3 DC and AC Operating Range AT28C16-15 Operating Temperature (Case) Com. 0°C - 70°C Ind. -40°C - 85°C 5V ± 10% VCC Power Supply Operating Modes Mode CE OE WE I/O Read VIL VIL VIH DOUT VIL VIH VIL DIN High Z Write (2) Standby/Write Inhibit (1) VIH X X Write Inhibit X X VIH Write Inhibit X VIL X Output Disable X VIH X High Z VIL High Z Chip Erase Notes: VIL VH (3) 1. X can be VIL or VIH. 2. Refer to AC Programming Waveforms. 3. VH = 12.0V ± 0.5V DC Characteristics Symbol Parameter Condition ILI Input Load Current ILO Max Units VIN = 0V to VCC + 1V 10 µA Output Leakage Current VI/O = 0V to VCC 10 µA ISB1 VCC Standby Current CMOS CE = VCC - 0.3V to VCC + 1.0V 100 µA Com. 2 mA ISB2 VCC Standby Current TTL CE = 2.0V to VCC + 1.0V Ind. 3 mA 30 mA VCC Active Current AC f = 5 MHz; IOUT = 0 mA CE = VIL Com. ICC Ind. 45 mA VIL Input Low Voltage 0.8 V VIH Input High Voltage VOL Output Low Voltage IOL = 2.1 mA VOH Output High Voltage IOH = -400 µA 4 Min 2.0 AT28C16 V .4 2.4 V V AT28C16 AC Read Characteristics AT28C16-15 Symbol Parameter tACC Min Max Units Address to Output Delay 150 ns (1) CE to Output Delay 150 ns (2) OE to Output Delay 10 70 ns tDF(3)(4) CE or OE High to Output Float 0 50 ns tOH Output Hold from OE, CE or Address, whichever occurred first 0 tCE tOE ns AC Read Waveforms(1)(2)(3)(4) Notes: 1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC. 2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change without impact on tACC. 3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF). 4. This parameter is characterized and is not 100% tested. Input Test Waveforms and Measurement Level Output Test Load tR, tF < 20 ns Pin Capacitance f = 1 MHz, T = 25°C(1) Symbol Typ Max Units Conditions CIN 4 6 pF VIN = 0V COUT 8 12 pF VOUT = 0V Note: 1. This parameter is characterized and is not 100% tested. 5 AC Write Characteristics Symbol Parameter Min tAS, tOES Address, OE Set-up Time 10 ns tAH Address Hold Time 50 ns tWP Write Pulse Width (WE or CE) 100 tDS Data Set-up Time 50 ns tDH, tOEH Data, OE Hold Time 10 ns tCS, tCH CE to WE and WE to CE Set-up and Hold Time 0 ns tWC Write Cycle Time AC Write Waveforms WE Controlled CE Controlled 6 AT28C16 Typ Max 1000 Units ns AT28C16 0.5 1.0 ms AT28C16E 100 200 µs AT28C16 Data Polling Characteristics(1) Symbol Parameter tDH Data Hold Time tOEH OE Hold Time Min OE to Output Delay tWR Write Recovery Time Notes: Max Units 10 ns 10 ns (2) tOE Typ ns 0 ns 1. These parameters are characterized and not 100% tested. 2. See AC Characteristics. Data Polling Waveforms Chip Erase Waveforms tS = tH = 1 µsec (min.) tW = 10 msec (min.) VH = 12.0V ± 0.5V 7 8 AT28C16 AT28C16 Ordering Information(1) ICC (mA) tACC (ns) Active Standby Ordering Code Package 150 30 0.1 AT28C16(E)-15JC AT28C16(E)-15PC AT28C16(E)-15SC 32J 24P6 24S Commercial (0°C to 70°C) 45 0.1 AT28C16(E)-15JI AT28C16(E)-15PI AT28C16(E)-15SI 32J 24P6 24S Industrial (-40°C to 85°C) Notes: Operation Range 1. See Valid Part Numbers table below. 2. The 28C16 200 ns and 250 ns speed selections have been removed from valid selections table and are replaced by the faster 150 ns TAA offering. 3. The 28C16 ceramic package offerings have been removed. New designs should utilize the 28C256 ceramic offerings. Valid Part Numbers The following table lists standard Atmel products that can be ordered. Device Numbers Speed Package and Temperature Combinations AT28C16 15 JC, JI, PC, PI, SC, SI AT28C16E 15 JC, JI, PC, PI, SC, SI AT28C16 - W Die Products Reference Section: Parallel EEPROM Die Products Package Type 32J 32 Lead, Plastic J-Leaded Chip Carrier (PLCC) 24P6 24 Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 24S 24 Lead, 0.300" Wide, Plastic Gull Wing Small Outline (SOIC) W Die Options Blank Standard Device: Endurance = 10K Write Cycles; Write Time = 1 ms E High Endurance Option: Endurance = 100K Write Cycles; Write Time = 200 µs 9 Packaging Information 32J, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC) Dimensions in Inches and (Millimeters) JEDEC STANDARD MS-018 AA 24P6, 24-Lead, 0.600” Wide, Plastic Dual Inline Package (PDIP) Dimensions in Inches and (Millimeters) JEDEC STANDARD MS-011 AA .045(1.14) X 45° PIN NO. 1 IDENTIFY .025(.635) X 30° - 45° .012(.305) .008(.203) .050(1.27) TYP .030(.762) .015(3.81) .095(2.41) .060(1.52) .140(3.56) .120(3.05) .022(.559) X 45° MAX (3X) .453(11.5) .447(11.4) .495(12.6) .485(12.3) .020(.508) .013(.330) .299(7.60) .420(10.7) .291(7.39) .393(9.98) PIN 1 ID .050(1.27) BSC .105(2.67) .092(2.34) .012(.305) .003(.076) .013(.330) .009(.229) 10 .050(1.27) .015(.381) AT28C16 .090(2.29) MAX 1.100(27.94) REF .220(5.59) MAX .005(.127) MIN SEATING PLANE .065(1.65) .015(.381) .022(.559) .014(.356) .161(4.09) .125(3.18) .110(2.79) .090(2.29) .012(.305) .008(.203) 24S, 24-Lead, 0.300” Wide, Plastic Gull Wing Small Outline (SOIC) Dimensions in Inches and (Millimeters) 0 REF 8 .566(14.4) .530(13.5) .021(.533) .013(.330) .300(7.62) REF .430(10.9) .390(9.90) AT CONTACT POINTS .616(15.6) .598(15.2) PIN 1 .530(13.5) .490(12.4) .553(14.0) .547(13.9) .595(15.1) .585(14.9) .032(.813) .026(.660) 1.27(32.3) 1.24(31.5) .065(1.65) .041(1.04) .630(16.0) .590(15.0) 0 REF 15 .690(17.5) .610(15.5) AT28C16 11 Atmel Headquarters Atmel Operations Corporate Headquarters Atmel Colorado Springs 2325 Orchard Parkway San Jose, CA 95131 TEL (408) 441-0311 FAX (408) 487-2600 Europe 1150 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 TEL (719) 576-3300 FAX (719) 540-1759 Atmel Rousset Atmel U.K., Ltd. Coliseum Business Centre Riverside Way Camberley, Surrey GU15 3YL England TEL (44) 1276-686677 FAX (44) 1276-686697 Zone Industrielle 13106 Rousset Cedex, France TEL (33) 4 42 53 60 00 FAX (33) 4 42 53 60 01 Asia Atmel Asia, Ltd. Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon, Hong Kong TEL (852) 27219778 FAX (852) 27221369 Japan Atmel Japan K.K. Tonetsu Shinkawa Bldg., 9F 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 Fax-on-Demand North America: 1-(800) 292-8635 International: 1-(408) 441-0732 e-mail [email protected] Web Site http://www.atmel.com BBS 1-(408) 436-4309 © Atmel Corporation 1998. Atmel Cor poration makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s website. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual proper ty of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life suppor t devices or systems. Marks bearing ® and/or ™ are registered trademarks and trademarks of Atmel Corporation. Terms and product names in this document may be trademarks of others. Printed on recycled paper. 0540B–10/98/xM