Features • Serial Peripheral Interface (SPI) Compatible • Supports SPI Modes 0 (0,0) and 3 (1,1) – Datasheet Describes Mode 0 Operation • 20 MHz Clock Rate • Byte Mode and 256-byte Page Mode for Program Operations • Sector Architecture: • • • • • • • • • • – Four Sectors with 32K Bytes Each (1M) – 128 Pages per Sector Product Identification Mode Low-voltage Operation – 2.7 (VCC = 2.7V to 3.6V) Sector Write Protection Write Protect (WP) Pin and Write Disable Instructions for both Hardware and Software Data Protection Self-timed Program Cycle (20 µs/Byte Typical) Self-timed Sector Erase Cycle (1 second/Sector Typical) Single Cycle Reprogramming (Erase and Program) for Status Register High Reliability – Endurance: 10,000 Write Cycles Typical Lead-free/Halogen-free Devices 8-lead JEDEC SOIC and 8-lead SAP Packages SPI Serial Memory 1M (131,072 x 8) AT25F1024A Description The AT25F1024A provides 1,048,576 bits of serial reprogrammable Flash memory organized as 131,072 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The AT25F1024A is available in a space-saving 8-lead JEDEC SOIC and 8-lead SAP packages. Advance Information The AT25F1024A is enabled through the Chip Select pin (CS) and accessed via a 3wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All write cycles are completely self-timed. BLOCK WRITE protection for top 1/4, top 1/2 or the entire memory array is enabled by programming the status register. Separate write enable and write disable instructions are provided for additional data protection. Hardware data protection is provided via the WP pin to protect against inadvertent write attempts to the status register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence. 8-lead SOIC Pin Configurations Pin Name Function CS Chip Select SCK Serial Data Clock SI Serial Data Input SO Serial Data Output GND Ground VCC Power Supply WP Write Protect HOLD Suspends Serial Input CS SO WP GND 1 2 3 4 VCC HOLD SCK SI 8 7 6 5 8-lead SAP VCC HOLD SCK SI 8 7 6 5 1 2 3 4 CS SO WP GND Bottom View Rev. 3346C–SEEPR–7/04 1 Absolute Maximum Ratings* Operating Temperature.................................... -40°C to +85°C Storage Temperature ..................................... -65°C to +150°C Voltage on Any Pin with Respect to Ground .....................................-1.0V to +3.6V Maximum Operating Voltage ............................................ 3.6V *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. DC Output Current........................................................ 5.0 mA Block Diagram 131,072 x 8 2 3346C–SEEPR–7/04 Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 20.0 MHz, VCC = +3.6V (unless otherwise noted). Symbol Test Conditions COUT Output Capacitance (SO) CIN Note: Max Units Conditions 8 pF VOUT = 0V 6 pF VIN = 0V Input Capacitance (CS, SCK, SI, WP, HOLD) 1. This parameter is characterized and is not 100% tested. DC Characteristics (Preliminary – Subject to Change) Applicable over recommended operating range from: TAI = -40 to +85°C, VCC = +2.7 to +3.6V, TAC = 0 to +70°C, VCC = +2.7 to +3.6V (unless otherwise noted). Symbol Parameter Max Units VCC Supply Voltage 3.6 V ICC1 Supply Current VCC = 3.6V at 20 MHz, SO = Open Read 10.0 15.0 mA ICC2 Supply Current VCC = 3.6V at 20 MHz, SO = Open Write 25.0 35.0 mA ISB Standby Current VCC = 2.7V, CS = V CC 2.0 10.0 µA IIL Input Leakage VIN = 0V to VCC -3.0 3.0 µA Output Leakage VIN = 0V to VCC, TAC = 0°C to 70°C -3.0 3.0 µA Input Low Voltage -0.6 VCC x 0.3 V VIH(1) Input High Voltage VCC x 0.7 VCC + 0.5 V VOL Output Low Voltage 0.2 V VOH Output High Voltage IOL VIL (1) Note: Test Condition Min Typ 2.7 2.7V ≤ VCC ≤ 3.6V IOL = 0.15 mA IOH = -100 µA VCC - 0.2 V 1. VIL and V IH max are reference only and are not tested. 3 3346C–SEEPR–7/04 AC Characteristics (Preliminary – Subject to Change) Applicable over recommended operating range from TA = -40 to +85°C, VCC = +2.7 to +3.6V CL = 1 TTL Gate and 30 pF (unless otherwise noted). Symbol Parameter fSCK SCK Clock Frequency tRI Max Units 20 MHz Input Rise Time 20 ns tFI Input Fall Time 20 ns tWH SCK High Time 20 ns tWL SCK Low Time 20 ns tCS CS High Time 25 ns tCSS CS Setup Time 25 ns tCSH CS Hold Time 25 ns tSU Data In Setup Time 5 ns tH Data In Hold Time 5 ns tHD Hold Setup Time 15 ns tCD Hold Time 15 ns tV Output Valid tHO Output Hold Time tLZ Hold to Output Low Z 200 ns tHZ Hold to Output High Z 200 ns tDIS Output Disable Time 100 ns tEC Erase Cycle Time per Sector 1.1 s tSR Status Register Write Cycle Time 60 ms 60 µs tBPC Byte Program Cycle Time Endurance Notes: (2) Min Typ 0 20 0 (1) ns ns 20 10K Write Cycles(3) 1. The programming time for n bytes will be equal to n x tBPC. 2. This parameter is characterized at 3.3V, 25°C and is not 100% tested. 3. One write cycle consists of erasing a sector, followed by programming the same sector. 4 3346C–SEEPR–7/04 Serial Interface Description MASTER: The device that generates the serial clock. SLAVE: Because the Serial Clock pin (SCK) is always an input, the AT25F1024A always operates as a slave. TRANSMITTER/RECEIVER: The AT25F1024A has separate pins designated for data transmission (SO) and reception (SI). MSB: The Most Significant Bit (MSB) is the first bit transmitted and received. SERIAL OP-CODE: After the device is selected with CS going low, the first byte will be received. This byte contains the op-code that defines the operations to be performed. INVALID OP-CODE: If an invalid op-code is received, no data will be shifted into the AT25F1024A, and the serial output pin (SO) will remain in a high impedance state until the falling edge of CS is detected again. This will reinitialize the serial communication. CHIP SELECT: The AT25F1024A is selected when the CS pin is low. When the device is not selected, data will not be accepted via the SI pin, and the serial output pin (SO) will remain in a high impedance state. HOLD: The HOLD pin is used in conjunction with the CS pin to select the AT25F1024A. When the device is selected and a serial sequence is underway, HOLD can be used to pause the serial communication with the master device without resetting the serial sequence. To pause, the HOLD pin must be brought low while the SCK pin is low. To resume serial communication, the HOLD pin is brought high while the SCK pin is low (SCK may still toggle during HOLD). Inputs to the SI pin will be ignored while the SO pin is in the high impedance state. WRITE PROTECT: The AT25F1024A has a write lockout feature that can be activated by asserting the write protect pin (WP). When the lockout feature is activated, locked-out sectors will be READ only. The write protect pin will allow normal read/write operations when held high. When the WP is brought low and WPEN bit is “1”, all write operations to the status register are inhibited. WP going low while CS is still low will interrupt a write to the status register. If the internal status register write cycle has already been initiated, WP going low will have no effect on any write operation to the status register. The WP pin function is blocked when the WPEN bit in the status register is “0”. This will allow the user to install the AT25F1024A in a system with the WP pin tied to ground and still be able to write to the status register. All WP pin functions are enabled when the WPEN bit is set to “1”. 5 3346C–SEEPR–7/04 SPI Serial Interface MASTER: MICROCONTROLLER DATA OUT (MOSI) DATA IN (MISO) SERIAL CLOCK (SPI CK) SS0 SS1 SS2 SS3 SLAVE: AT25F1024A SI SO SCK CS SI SO SCK CS SI SO SCK CS SI SO SCK CS 6 3346C–SEEPR–7/04 Functional Description The AT25F1024A is designed to interface directly with the synchronous serial peripheral interface (SPI) of the 6800 type series of microcontrollers. The AT25F1024A utilizes an 8-bit instruction register. The list of instructions and their operation codes are contained in Table 1. All instructions, addresses, and data are transferred with the MSB first and start with a high-to-low transition. Write is defined as program and/or erase in this specification. The following commands, PROGRAM, SECTOR ERASE, CHIP ERASE, and WRSR are write instructions for AT25F1024A. Table 1. Instruction Set for the AT25F1024A Instruction Name Instruction Format Operation WREN 0000 X110 Set Write Enable Latch WRDI 0000 X100 Reset Write Enable Latch RDSR 0000 X101 Read Status Register WRSR 0000 X001 Write Status Register READ 0000 X011 Read Data from Memory Array PROGRAM 0000 X010 Program Data Into Memory Array SECTOR ERASE 0101 X010 Erase One Sector in Memory Array CHIP ERASE 0110 X010 Erase All Sectors in Memory Array RDID 0001 X101 Read Manufacturer and Product ID WRITE ENABLE (WREN): The device will power up in the write disable state when VCC is applied. All write instructions must therefore be preceded by the WREN instruction. WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the WRDI instruction disables all write commands. The WRDI instruction is independent of the status of the WP pin. READ STATUS REGISTER (RDSR): The RDSR instruction provides access to the status register. The READY/BUSY and write enable status of the device can be determined by the RDSR instruction. Similarly, the Block Write Protection bits indicate the extent of protection employed. These bits are set by using the WRSR instruction. During internal write cycles, all other commands will be ignored except the RDSR instruction. Table 2. Status Register Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 WPEN X X X BP1 BP0 WEN RDY 7 3346C–SEEPR–7/04 Table 3. Read Status Register Bit Definition Bit Definition Bit 0 (RDY) Bit 0 = 0 (RDY) indicates the device is READY. Bit 0 = 1 indicates the write cycle is in progress. Bit 1 (WEN) Bit 1 = 0 indicates the device is not WRITE ENABLED. Bit 1 = 1 indicates the device is WRITE ENABLED. Bit 2 (BP0) See Table 4. Bit 3 (BP1) See Table 4. Bits 4-6 are 0s when device is not in an internal write cycle. Bit 7 (WPEN) See Table 5. Bits 0-7 are 1s during an internal write cycle. READ PRODUCT ID (RDID): The RDID instruction allows the user to read the manufacturer and product ID of the device. The first byte after the instruction will be the manufacturer code (1FH = ATMEL), followed by the device code, 60H. WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select one of four levels of protection for the AT25F1024A. The AT25F1024A is divided into four sectors where the top quarter (1/4), top half (1/2), or all of the memory sectors can be protected (locked out) from write. Any of the locked-out sectors will therefore be READ only. The locked-out sector and the corresponding status register control bits are shown in Table 4. The three bits, BP0, BP1, and WPEN, are nonvolatile cells that have the same properties and functions as the regular memory cells (e.g., WREN, tWC, RDSR). Table 4. Block Write Protect Bits Status Register Bits AT25F1024A BP1 BP0 Array Addresses Locked Out Locked-out Sector(s) 0 0 0 None None 1(1/4) 0 1 018000 - 01FFFF Sector 4 2(1/2) 1 0 010000 - 01FFFF Sector 3, 4 3(All) 1 1 000000 - 01FFFF All sectors (1 - 4) Level 8 3346C–SEEPR–7/04 The WRSR instruction also allows the user to enable or disable the Write Protect (WP) pin through the use of the Write Protect Enable (WPEN) bit. Hardware write protection is enabled when the WP pin is low and the WPEN bit is “1”. Hardware write protection is disabled when either the WP pin is high or the WPEN bit is “0.” When the device is hardware write protected, writes to the Status Register, including the Block Protect bits and the WPEN bit, and the locked-out sectors in the memory array are disabled. Write is only allowed to sectors of the memory which are not locked out. The WRSR instruction is self-timed to automatically erase and program BP0, BP1, and WPEN bits. In order to write the status register, the device must first be write enabled via the WREN instruction. Then, the instruction and data for the three bits are entered. During the internal write cycle, all instructions will be ignored except RDSR instructions. The AT25F1024A will automatically return to write disable state at the completion of the WRSR cycle. Note: When the WPEN bit is hardware write protected, it cannot be changed back to “0”, as long as the WP pin is held low. Table 5. WPEN Operation WPEN WP WEN ProtectedBlocks UnprotectedBlocks Status Register 0 X 0 Protected Protected Protected 0 X 1 Protected Writable Writable 1 Low 0 Protected Protected Protected 1 Low 1 Protected Writable Protected X High 0 Protected Protected Protected X High 1 Protected Writable Writable READ* (READ): Reading the AT25F1024A via the SO (Serial Output) pin requires the following sequence. After the CS line is pulled low to select a device, the READ instruction is transmitted via the SI line followed by the byte address to be read (Refer to Table 6). Upon completion, any data on the SI line will be ignored. The data (D7-D0) at the specified address is then shifted out onto the SO line. If only one byte is to be read, the CS line should be driven high after the data comes out. The READ instruction can be continued since the byte address is automatically incremented and data will continue to be shifted out. For the AT25F1024A, when the highest address is reached, the address counter will roll over to the lowest address allowing the entire memory to be read in one continuous READ instruction. PROGRAM (PROGRAM): In order to program the AT25F1024A, two separate instructions must be executed. First, the device must be write enabled via the WREN instruction. Then the PROGRAM instruction can be executed. Also, the address of the memory location(s) to be programmed must be outside the protected address field location selected by the Block Write Protection Level. During an internal self-timed programming cycle, all commands will be ignored except the RDSR instruction. The PROGRAM instruction requires the following sequence. After the CS line is pulled low to select the device, the PROGRAM instruction is transmitted via the SI line followed by the byte address and the data (D7-D0) to be programmed (Refer to Table 6). Programming will start after the CS pin is brought high. The low-to-high transition of the CS pin must occur during the SCK low time immediately after clocking in the D0 (LSB) data bit. The READY/BUSY status of the device can be determined by initiating a RDSR instruction. If Bit 0 = 1, the program cycle is still in progress. If Bit 0 = 0, the program cycle has ended. Only the RDSR instruction is enabled during the program cycle. 9 3346C–SEEPR–7/04 A single PROGRAM instruction programs 1 to 256 consecutive bytes within a page if it is not write protected. The starting byte could be anywhere within the page. When the end of the page is reached, the address will wrap around to the beginning of the same page. If the data to be programmed are less than a full page, the data of all other bytes on the same page will remain unchanged. If more than 256 bytes of data are provided, the address counter will roll over on the same page and the previous data provided will be replaced. The same byte cannot be reprogrammed without erasing the whole sector first. The AT25F1024A will automatically return to the write disable state at the completion of the PROGRAM cycle. Note: If the device is not write enabled (WREN), the device will ignore the Write instruction and will return to the standby state, when CS is brought high. A new CS falling edge is required to re-initiate the serial communication. Table 6. Address Key Address AT25F1024A AN A16 - A0 Don’t Care Bits A23 - A17 SECTOR ERASE (SECTOR ERASE): Before a byte can be reprogrammed, the sector which contains the byte must be erased. In order to erase the AT25F1024A, two separate instructions must be executed. First, the device must be write enabled via the WREN instruction. Then the SECTOR ERASE instruction can be executed. Table 7. Sector Addresses Sector Address AT25F1024A Sector 000000 to 007FFF Sector 1 008000 to 00FFFF Sector 2 010000 to 017FFF Sector 3 018000 to 01FFFF Sector 4 The SECTOR ERASE instruction erases every byte in the selected sector if the sector is not locked out. Sector address is automatically determined if any address within the sector is selected. The SECTOR ERASE instruction is internally controlled; it will automatically be timed to completion. During this time, all commands will be ignored, except RDSR instruction. The AT25F1024A will automatically return to the write disable state at the completion of the SECTOR ERASE cycle. CHIP ERASE (CHIP ERASE): As an alternative to the SECTOR ERASE, the CHIP ERASE instruction will erase every byte in all sectors that are not locked out. First, the device must be write enabled via the WREN instruction. Then the CHIP ERASE instruction can be executed. The CHIP ERASE instruction is internally controlled; it will automatically be timed to completion. The CHIP ERASE cycle time typically is 3.5 seconds. During the internal erase cycle, all instructions will be ignored except RDSR. The AT25F1024A will automatically return to the write disable state at the completion of the CHIP ERASE cycle. 10 3346C–SEEPR–7/04 Timing Diagrams (for SPI Mode 0 (0, 0)) Synchronous Data Timing t CS VIH CS VIL t CSH t CSS VIH t WH SCK t WL VIL tH t SU VIH SI VALID IN VIL tV VOH SO HI-Z t HO t DIS HI-Z VOL WREN Timing WRDI Timing 11 3346C–SEEPR–7/04 RDSR Timing CS 0 1 2 3 4 5 6 7 8 9 10 7 6 5 11 12 13 14 15 2 1 0 SCK INSTRUCTION SI DATA OUT HIGH IMPEDANCE SO 4 3 MSB WRSR Timing READ Timing CS 0 1 2 3 4 5 6 7 8 9 10 11 28 29 30 31 32 33 34 35 36 37 38 39 SCK 3-BYTE ADDRESS SI SO INSTRUCTION HIGH IMPEDANCE 23 22 21 ... 3 2 1 0 7 6 5 4 3 2 1 0 12 3346C–SEEPR–7/04 PROGRAM Timing 4 5 6 7 8 9 10 11 28 29 30 31 32 33 34 2079 3 2078 2 2077 1 2076 0 2075 CS SCK 256th BYTE DATA-IN 1st BYTE DATA-IN 3-BYTE ADDRESS SI INSTRUCTION 23 22 21 3 2 1 0 7 6 5 4 3 2 1 0 HIGH IMPEDANCE SO HOLD Timing CS tCD tCD SCK tHD tHD HOLD tHZ SO tLZ SECTOR ERASE Timing X X = Don’t Care bit 13 3346C–SEEPR–7/04 CHIP ERASE Timing X X = Don’t Care bit RDID Timing 12 13 14 15 16 17 18 19 23 X MANUFACTURER CODE (ATMEL) DEVICE CODE 14 3346C–SEEPR–7/04 Ordering Information Ordering Code Package AT25F1024AN-10SU-2.7 AT25F1024AY4-10YU-2.7 Operation Range 8S1 8Y4 Lead-free/Halogen-free Industrial (-40 to 85°C) Package Type 8S1 8-lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) 8Y4 8-lead, 6.00 mm x 4.90 mm Body, Dual Footprint, Non-leaded, Small Array Package (SAP) Options -2.7 Low-voltage (2.7V to 3.6V) 15 3346C–SEEPR–7/04 Package Drawing 8S1 – JEDEC SOIC C 1 E E1 L N ∅ Top View End View e B COMMON DIMENSIONS (Unit of Measure = mm) A SYMBOL A1 D Side View MIN NOM MAX A 1.35 – 1.75 A1 0.10 – 0.25 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 NOTE 1.27 BSC L 0.40 – 1.27 ∅ 0˚ – 8˚ Note: These drawings are for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc. 10/7/03 R 1150 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 TITLE 8S1, 8-lead (0.150" Wide Body), Plastic Gull Wing Small Outline (JEDEC SOIC) DRAWING NO. 8S1 REV. B 16 3346C–SEEPR–7/04 8Y4 – SAP PIN 1 INDEX AREA A D1 PIN 1 ID D E1 L A1 E e b e1 A COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN NOM MAX A – – 0.90 A1 0.00 – 0.05 D 5.80 6.00 6.20 E 4.70 4.90 5.10 D1 2.85 3.00 3.15 E1 2.85 3.00 3.15 b 0.35 0.40 0.45 e 1.27 TYP e1 3.81 REF L 0.50 0.60 NOTE 0.70 5/24/04 R 1150 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 80817 TITLE 8Y4, 8-lead (6.00 x 4.90 mm Body) SOIC Array Package (SAP) Y4 DRAWING NO. REV. 8Y4 A 17 3346C–SEEPR–7/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 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 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA 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 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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