AT24C32

Features • Low-Voltage and Standard-Voltage Operation • • • • • • • • • • • • – 2.7 (VCC = 2.7V to 5.5V) – 1.8 (VCC = 1.8V to 5.5V) Low-Power Devices (ISB = 2 µA at 5.5V) Available Internally Organized 4096 x 8, 8192 x 8 2-Wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 100 kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Clock Rate Write Protect Pin for Hardware Data Protection 32-Byte Page Write Mode (Partial Page Writes Allowed) 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-Pin JEDEC PDIP, 8-Pin JEDEC SOIC, 8-Pin EIAJ SOIC, and 8-pin TSSOP Packages 2-Wire Serial EEPROM 32K (4096 x 8) 64K (8192 x 8) Description The AT24C32/64 provides 32,768/65,536 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 4096/8192 words of 8 bits each. The device’s cascadable feature allows up to 8 devices to share a common 2wire bus. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. The AT24C32/64 is available in space saving 8-pin JEDEC PDIP, 8-pin JEDEC SOIC, 8-pin EIAJ SOIC, and 8-pin TSSOP (AT24C64) packages and is accessed via a 2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions. AT24C32 AT24C64 Pin Configurations Pin Name A0 - A2 SDA SCL WP Function Address Inputs Serial Data Serial Clock Input Write Protect 8-Pin PDIP A0 A1 A2 GND 1 2 3 4 8 7 6 5 VCC WP SCL SDA A0 A1 A2 GND 8-Pin TSSOP 1 2 3 4 8 7 6 5 VCC WP SCL SDA 2-Wire, 32K Serial E2PROM 8-Pin SOIC A0 A1 A2 GND 1 2 3 4 8 7 6 5 VCC WP SCL SDA Rev. 0336K–SEEPR–7/03 1 Absolute Maximum Ratings* Operating Temperature.................................. -55°C to +125°C 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 *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. Block Diagram 2 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 Pin Description SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device. SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open collector devices. DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are hard wired or left not connected for hardware compatibility with AT24C16. When the pins are hardwired, as many as eight 32K/64K devices may be addressed on a single bus system (device addressing is discussed in detail under the Device Addressing section). When the pins are not hardwired, the default A2, A1, and A0 are zero. WRITE PROTECT (WP): The write protect input, when tied to GND, allows normal write operations. When WP is tied high to VCC, all write operations to the upper quandrant (8/16K bits) of memory are inhibited. If left unconnected, WP is internally pulled down to GND. Memory Organization AT24C32/64, 32K/64K SERIAL EEPROM: The 32K/64K is internally organized as 256 pages of 32 bytes each. Random word addressing requires a 12/13 bit data word address. 3 0336K–SEEPR–7/03 Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V. Symbol CI/O CIN Note: Test Condition Input/Output Capacitance (SDA) Input Capacitance (A 0, A1, A2, SCL) 1. This parameter is characterized and is not 100% tested. Max 8 6 Units pF pF Conditions VI/O = 0V VIN = 0V DC Characteristics Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = +1.8V to +5.5V, TAC = 0°C to +70°C, VCC = +1.8V to +5.5V (unless otherwise noted). Symbol VCC1 VCC2 VCC3 VCC4 ICC1 ICC2 ISB1 Parameter Supply Voltage Supply Voltage Supply Voltage Supply Voltage Supply Current Supply Current Standby Current (1.8V option) Standby Current (2.5V option) Standby Current (2.7V option) Standby Current (5V option) Input Leakage Current Output Leakage Current Input Low Level(1) Input High Level (1) Test Condition Min 1.8 2.5 2.7 4.5 Typ Max 5.5 5.5 5.5 5.5 Units V V V V mA mA µA VCC = 5.0V VCC = 5.0V VCC = 1.8V VCC = 5.5V VCC = 2.5V VCC = 5.5V VCC = 2.7V VCC = 5.5V VCC = 4.5 - 5.5V VIN = VCC or VSS VOUT = VCC or VSS READ at 100 kHz WRITE at 100 kHz VIN = VCC or VSS 0.4 2.0 1.0 3.0 0.1 2.0 0.5 ISB2 VIN = VCC or VSS µA 2.0 0.5 µA ISB3 ISB4 ILI ILO VIL VIH VOL2 VOL1 Note: VIN = VCC or VSS VIN = VCC or VSS 20 0.10 0.05 -0.6 VCC x 0.7 2.0 35 3.0 3.0 VCC x 0.3 VCC + 0.5 0.4 0.2 µA µA µA V V V V Output Low Level Output Low Level VCC = 3.0V VCC = 1.8V IOL = 2.1 mA IOL = 0.15 mA 1. VIL min and VIH max are reference only and are not tested. 4 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 AC Characteristics Applicable over recommended operating range from TA = -40°C to +85°C, VCC = +1.8V to +5.5V, CL = 1 TTL Gate and 100 pF (unless otherwise noted). 1.8-volt Symbol fSCL tLOW tHIGH tI tAA tBUF tHD.STA tSU.STA tHD.DAT tSU.DAT tR tF tSU.STO tDH tWR Endurance(1) Note: Parameter Clock Frequency, SCL Clock Pulse Width Low Clock Pulse Width High Noise Suppression Time(1) Clock Low to Data Out Valid Time the bus must be free before a new transmission can start(1) Start Hold Time Start Set-up Time Data In Hold Time Data In Set-up Time Inputs Rise Time (1) 2.7-, 2.5-volt Min Max 100 4.7 4.0 5.0-volt Min Max 400 1.2 0.6 Units kHz µs µs 50 0.1 1.2 0.6 0.6 0 100 0.9 ns µs µs µs µs µs ns 0.3 300 0.6 50 µs ns µs ns 10 1M ms Write Cycles Min Max 100 4.7 4.0 100 0.1 4.7 4.0 4.7 0 200 1.0 300 4.7 100 20 1M 4.5 100 0.1 4.7 4.0 4.7 0 200 1.0 300 4.7 100 10 1M 4.5 Inputs Fall Time(1) Stop Set-up Time Data Out Hold Time Write Cycle Time 5.0V, 25°C, Page Mode 1. This parameter is characterized and is not 100% tested. 5 0336K–SEEPR–7/03 Device Operation CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time periods (refer to Data Validity timing diagram). Data changes during SCL high periods will indicate a start or stop condition as defined below. START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (refer to Start and Stop Definition timing diagram). STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the stop command will place the EEPROM in a standby power mode (refer to Start and Stop Definition timing diagram). ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word. STANDBY MODE: T he AT24C32/64 features a low power standby mode which is enabled: a) upon power-up and b) after the receipt of the STOP bit and the completion of any internal operations. MEMORY RESET: After an interruption in protocol, power loss or system reset, any 2wire part can be reset by following these steps: (a) Clock up to 9 cycles, (b) look for SDA high in each cycle while SCL is high and then (c) create a start condition as SDA is high. 6 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 Bus Timing SCL: Serial Clock, SDA: Serial Data I/O Write Cycle Timing SCL: Serial Clock, SDA: Serial Data I/O SCL SDA 8th BIT WORDn ACK twr STOP CONDITION Note: (1) START CONDITION 1. The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the internal clear/write cycle. 7 0336K–SEEPR–7/03 Data Validity Start and Stop Definition Output Acknowledge 8 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 Device Addressing The 32K/64K EEPROM requires an 8-bit device address word following a start condition to enable the chip for a read or write operation (refer to Figure 1). The device address word consists of a mandatory one, zero sequence for the first four most significant bits as shown. This is common to all 2-wire EEPROM devices. The 32K/64K uses the three device address bits A2, A1, A0 to allow as many as eight devices on the same bus. These bits must compare to their corresponding hardwired input pins. The A2, A1, and A0 pins use an internal proprietary circuit that biases them to a logic low condition if the pins are allowed to float. The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit is high and a write operation is initiated if this bit is low. Upon a compare of the device address, the EEPROM will output a zero. If a compare is not made, the device will return to standby state. NOISE PROTECTION: Special internal circuitry placed on the SDA and SCL pins prevent small noise spikes from activating the device. A low-VCC d etector (5-volt option) resets the device to prevent data corruption in a noisy environment. DATA SECURITY: The AT24C32/64 has a hardware data protection scheme that allows the user to write protect the upper quadrant (8/16K bits) of memory when the WP pin is at VCC. Write Operations BYTE WRITE: A write operation requires two 8-bit data word addresses following the device address word and acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a zero and the addressing device, such as a microcontroller, must terminate the write sequence with a stop condition. At this time the EEPROM enters an internally-timed write cycle, t WR, to the nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write is complete (refer to Figure 2). PAGE WRITE: The 32K/64K EEPROM is capable of 32-byte page writes. A page write is initiated the same way as a byte write, but the microcontroller does not send a stop condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcontroller can transmit up to 31 more data words. The EEPROM will respond with a zero after each data word received. The microcontroller must terminate the page write sequence with a stop condition (refer to Figure 3). The data word address lower 5 bits are internally incremented following the receipt of each data word. The higher data word address bits are not incremented, retaining the memory page row location. When the word address, internally generated, reaches the page boundary, the following byte is placed at the beginning of the same page. If more than 32 data words are transmitted to the EEPROM, the data word address will “roll over” and previous data will be overwritten. ACKNOWLEDGE POLLING: Once the internally-timed write cycle has started and the EEPROM inputs are disabled, acknowledge polling can be initiated. This involves sending a start condition followed by the device address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has completed will the EEPROM respond with a zero, allowing the read or write sequence to continue. 9 0336K–SEEPR–7/03 Read Operations Read operations are initiated the same way as write operations with the exception that the read/write select bit in the device address word is set to one. There are three read operations: current address read, random address read and sequential read. CURRENT ADDRESS READ: T he internal data word address counter maintains the last address accessed during the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. The address “roll over” during read is from the last byte of the last memory page, to the first byte of the first page. The address “roll over” during write is from the last byte of the current page to the first byte of the same page. Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an input zero but does generate a following stop condition (refer to Figure 4). RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the microcontroller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the read/write select bit high. The EEPROM acknowledges the device address and serially clocks out the data word. The microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 5). SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a random address read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will “roll over” and the sequential read will continue. The sequential read operation is terminated when the microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 6). 10 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 Figure 1. D evice Address Figure 2. Byte Write Figure 3. Page Write Note: 1. * = DON’T CARE bits 2. † = DON’T CARE bits for the 32K 11 0336K–SEEPR–7/03 Figure 4. Current Address Read Figure 5. Random Read Note: 1. * = DON’T CARE bits Figure 6. Sequential Read 12 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 AT24C32 Ordering Information Ordering Code AT24C32-10PI-2.7 AT24C32N-10SI-2.7 AT24C32W-10SI-2.7 AT24C32-10PI-1.8 AT24C32N-10SI-1.8 AT24C32W-10SI-1.8 Note: Package 8P3 8S1 8S2 8P3 8S1 8S2 Operation Range Industrial (-40°C to 85°C) Industrial (-40°C to 85°C) For 2.7V devices used in the 4.5V to 5.5V range, please refer to performance values in the AC and DC characteristics tables. Package Type 8P3 8S1 8S2 8-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP) 8-lead, 0.150” Wide, Plastic Gull Wing Small Outline (JEDEC SOIC) 8-lead, 0.200” Wide, Plastic Gull Wing Small Outline (EIAJ SOIC) Options -2.7 -1.8 Low Voltage (2.7V to 5.5V) Low Voltage (1.8V to 5.5V) 13 0336K–SEEPR–7/03 AT24C64 Ordering Information Ordering Code AT24C64-10PI-2.7 AT24C64N-10SI-2.7 AT24C64W-10SI-2.7 AT24C64-10TI-2.7 AT24C64-10PI-1.8 AT24C64N-10SI-1.8 AT24C64W-10SI-1.8 AT24C64-10TI-1.8 Note: Package 8P3 8S1 8S2 8A2 8P3 8S1 8S2 8A2 Operation Range Industrial (-40°C to 85°C) Industrial (-40°C to 85°C) For 2.7V devices used in the 4.5V to 5.5V range, please refer to performance values in the AC and DC characteristics tables. Package Type 8P3 8S1 8S2 8A2 8-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP) 8-lead, 0.150” Wide, Plastic Gull Wing Small Outline (JEDEC SOIC) 8-lead, 0.200” Wide, Plastic Gull Wing Small Outline (EIAJ SOIC) 8-lead, 0.170” Wide, Thin Shrink Small Outline Package (TSSOP) Options -2.7 -1.8 Low Voltage (2.7V to 5.5V) Low Voltage (1.8V to 5.5V) 14 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 Packaging Information 8P3 – PDIP E E1 1 N Top View c eA End View D e D1 A2 A SYMBOL COMMON DIMENSIONS (Unit of Measure = inches) MIN NOM MAX NOTE A A2 b b2 b3 c D 0.115 0.014 0.045 0.030 0.008 0.355 0.005 0.300 0.240 0.310 0.250 0.100 BSC 0.300 BSC 0.115 0.130 0.130 0.018 0.060 0.039 0.010 0.365 0.210 0.195 0.022 0.070 0.045 0.014 0.400 2 5 6 6 3 3 b2 b3 4 PLCS L D1 E E1 e eA L b 0.325 0.280 4 3 Side View 4 0.150 2 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). 01/09/02 2325 Orchard Parkway San Jose, CA 95131 TITLE 8P3, 8-lead, 0.300" Wide Body, Plastic Dual In-line Package (PDIP) DRAWING NO. 8P3 REV. B R 15 0336K–SEEPR–7/03 8S1 – JEDEC SOIC 3 2 1 H N Top View e B A D Side View SYMBOL A COMMON DIMENSIONS (Unit of Measure = mm) MIN – – – – – NOM – – – – – 1.27 BSC – – – – 6.20 1.27 MAX 1.75 0.51 0.25 5.00 4.00 NOTE A2 C B C D E L E e H L End View Note: This drawing is for general information only. Refer to JEDEC Drawing MS-012 for proper dimensions, tolerances, datums, etc. 10/10/01 2325 Orchard Parkway San Jose, CA 95131 TITLE 8S1, 8-lead (0.150" Wide Body), Plastic Gull Wing Small Outline (JEDEC SOIC) DRAWING NO. 8S1 REV. A R 16 AT24C32/64 0336K–SEEPR–7/03 AT24C32/64 8S2 – EIAJ SOIC 1 H N Top View e b A D Side View SYMBOL COMMON DIMENSIONS (Unit of Measure = mm) MIN NOM MAX NOTE A 1.78 0.05 0.35 0.18 5.13 5.13 7.62 0.51 1.27 BSC 2.03 0.33 0.51 0.25 5.38 5.41 8.38 0.89 4 2, 3 5 5 A1 L E C A1 b C D E End View H L e Notes: 1. 2. 3. 4. 5. This drawing is for general information only; refer to EIAJ Drawing EDR-7320 for additional information. Mismatch of the upper and lower dies and resin burrs aren't included. It is recommended that upper and lower cavities be equal. If they are different, the larger dimension shall be regarded. Determines the true geometric position. Values b,C apply to pb/Sn solder plated terminal. The standard thickness of the solder layer shall be 0.010 +0.010/-0.005 mm. 5/2/02 TITLE 8S2, 8-lead, 0.209" Body, Plastic Small Outline Package (EIAJ) DRAWING NO. REV. B R 2325 Orchard Parkway San Jose, CA 95131 8S2 17 0336K–SEEPR–7/03 8A2 – TSSOP 3 21 Pin 1 indicator this corner E1 E L1 N L Top View End View COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN 2.90 NOM 3.00 6.40 BSC 4.30 – 0.80 0.19 4.40 – 1.00 – 0.65 BSC 0.45 0.60 1.00 REF 0.75 4.50 1.20 1.05 0.30 4 3, 5 MAX 3.10 NOTE 2, 5 b A D E E1 A e D A2 A2 b e Side View L L1 Notes: 1. This drawing is for general information only. Refer to JEDEC Drawing MO-153, Variation AA, for proper dimensions, tolerances, datums, etc. 2. Dimension D does not include mold Flash, protrusions or gate burrs. Mold Flash, protrusions and gate burrs shall not exceed 0.15 mm (0.006 in) per side. 3. Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. Dimension b does not include Dambar protrusion. Allowable Dambar protrusion shall be 0.08 mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and adjacent lead is 0.07 mm. 5. Dimension D and E1 to be determined at Datum Plane H. 5/30/02 R 2325 Orchard Parkway San Jose, CA 95131 TITLE 8A2, 8-lead, 4.4 mm Body, Plastic Thin Shrink Small Outline Package (TSSOP) DRAWING NO. 8A2 REV. B 18 AT24C32/64 0336K–SEEPR–7/03 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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Blvd. Colorado Springs, CO 80906 Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 e-mail literature@atmel.com Web Site http://www.atmel.com Disclaimer: A tmel Corporation 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 web site. 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. 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