AT25640B-MEHL-T

Features • Serial Peripheral Interface (SPI) Compatible • Supports SPI Modes 0 (0,0) and 3 (1,1) – Datasheet Describes Mode 0 Operation • Low-voltage and Standard-voltage Operation • • • • • • – 1.8 (VCC = 1.8V to 5.5V) 20MHz Clock Rate (5V) 32-byte Page Mode Block Write Protection – Protect 1/4, 1/2, or Entire Array Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection Self-timed Write Cycle (5ms max) High Reliability – Endurance: One Million Write Cycles – Data Retention: 100 Years Green (Pb/Halide-free/RoHS Compliant) Packaging Options Die Sales: Wafer Form, Tape and Reel, and Bumped Wafers SPI Serial EEPROMs 32K (4096 x 8) 64K (8192 x 8) Atmel AT25320B AT25640B • • Description The Atmel® AT25320B/640B provides 32768-/65536-bits of serial electrically-erasable programmable read-only memory (EEPROM) organized as 4096/8192 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 AT25320B/640B is available in space-saving 8-lead JEDEC SOIC, 8-lead UDFN, 8-lead XDFN, 8-lead TSSOP, and 8-ball VFBGA packages. The AT25320B/640B is enabled through the Chip Select pin (CS) and accessed via a three-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate erase cycle is required before write. Table 0-1. Pin Name CS SCK SI SO GND VCC WP HOLD Pin Configuration Function Chip Select Serial Data Clock Serial Data Input Serial Data Output Ground Power Supply Write Protect Suspends Serial Input CS SO WP GND 8-lead SOIC 1 2 3 4 8 7 6 5 8-lead TSSOP VCC HOLD SCK SI CS SO WP GND 1 2 3 4 8 7 6 5 VCC HOLD SCK SI 8-lead UDFN VCC HOLD SCK SI 8 7 6 5 1 CS 2 SO 3 WP 4 GND 8-lead XDFN VCC HOLD SCK SI 8 7 6 5 1 CS 2 SO 3 WP 4 GND Bottom View 8-ball VFBGA VCC HOLD SCK SI 8 7 6 5 1 2 3 4 Bottom View CS SO WP GND 8535F–SEEPR–6/10 Bottom View Block write protection is enabled by programming the status register with one of four blocks of write protection. Separate program enable and program 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. 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. Figure 1-1. Block Diagram 2 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B Table 1-1. Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 1.0MHz, VCC = +5.0V (unless otherwise noted) Symbol COUT CIN Note: Test Conditions Output Capacitance (SO) Input Capacitance (CS, SCK, SI, WP, HOLD) 1. This parameter is characterized and is not 100% tested Max 8 6 Units pF pF Conditions VOUT = 0V VIN = 0V Table 1-2. DC Characteristics Applicable over recommended operating range from: TAI = –40°C to +85C, VCC = +1.8V to +5.5V (unless otherwise noted) Symbol VCC1 VCC2 VCC3 ICC1 ICC2 ICC3 ISB1 ISB2 ISB3 IIL IOL VIL (1) (1) Parameter Supply Voltage Supply Voltage Supply Voltage Supply Current Supply Current Supply Current Standby Current Standby Current Standby Current Input Leakage Output Leakage Input Low-voltage Input High-voltage Output Low-voltage Output High-voltage Output Low-voltage Output High-voltage Test Condition Min 1.8 2.5 4.5 Typ Max 5.5 5.5 5.5 Units V V V mA mA mA µA µA µA µA µA V V V V VCC = 5.0V at 20MHz, SO = Open, Read VCC = 5.0V at 20MHz, SO = Open, Read, Write VCC = 5.0V at 5MHz, SO = Open, Read, Write VCC = 1.8V, CS = VCC VCC = 2.5V, CS = VCC VCC = 5.0V, CS = VCC VIN = 0V to VCC VIN = 0V to VCC, TAC = 0°C to 70°C –3.0 –3.0 –0.6 VCC x 0.7 3.6V  VCC  5.5V 1.8V  VCC  3.6V IOL = 3.0mA IOH = 1.6mA IOL = 0.15mA IOH = 100µA VCC - 0.2 VCC - 0.8 7.5 4.0 4.0 < 0.1 0.3 2.0 10.0 10.0 6.0 6.0(2) 7.0 (2) (2) 10.0 3.0 3.0 VCC x 0.3 VCC + 0.5 0.4 VIH VOL1 VOH1 VOL2 VOH2 Notes: 0.2 V V 1. VIL min and VIH max are reference only and are not tested 2. Worst case measured at 85°C 3 8535F–SEEPR–6/10 Table 1-3. AC Characteristics Applicable over recommended operating range from TAI = –40°C to +85°C, VCC = As Specified, CL = 1 TTL Gate and 30pF (unless otherwise noted) Symbol Parameter SCK Clock Frequency Voltage 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 20 40 80 20 40 80 25 50 100 25 50 100 25 50 100 5 10 20 5 10 20 5 10 20 5 10 20 0 0 0 0 0 0 20 40 80 ns Min 0 0 0 Max 20 10 5 2 2 2 2 2 2 Units MHz fSCK tRI Input Rise Time µs tFI Input Fall Time µs tWH SCK High Time ns tWL SCK Low Time ns tCS CS High Time ns tCSS CS Setup Time ns tCSH CS Hold Time ns tSU Data In Setup Time ns tH Data In Hold Time ns tHD HOLD Setup Time tCD HOLD Hold Time tV Output Valid ns tHO Output Hold Time ns 4 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B Table 1-3. AC Characteristics (Continued) Applicable over recommended operating range from TAI = –40°C to +85°C, VCC = As Specified, CL = 1 TTL Gate and 30pF (unless otherwise noted) Symbol Parameter HOLD to Output Low Z Voltage 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 4.5–5.5 2.5–5.5 1.8–5.5 1M Min 0 0 0 Max 25 50 100 40 80 200 40 80 200 5 5 5 Units ns tLZ tHZ HOLD to Output High Z ns tDIS Output Disable Time ns tWC Endurance(1) Note: Write Cycle Time 3.3V, 25°C, Page Mode ms Write Cycles 1. This parameter is characterized and is not 100% tested 2. Serial Interface Description MASTER: The device that generates the serial clock. SLAVE: Because the Serial Clock pin (SCK) is always an input, the Atmel® AT25320B/640B always operates as a slave. TRANSMITTER/RECEIVER: The AT25320B/640B 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 AT25320B/640B, 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 AT25320B/640B 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 AT25320B/640B. 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 write protect pin (WP) will allow normal read/write operations when held high. When the WP pin 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 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 AT25320B/640B in a system with the 5 8535F–SEEPR–6/10 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”. Figure 2-1. SPI Serial Interface AT25320B/640B 6 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B 3. Functional Description The Atmel® AT25320B/640B is designed to interface directly with the synchronous serial peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers. The AT25320B/640B utilizes an 8-bit instruction register. The list of instructions and their operation codes are contained in Table 3-1. All instructions, addresses, and data are transferred with the MSB first and start with a high-tolow CS transition. Table 3-1. Instruction Set for the Atmel AT25320B/640B Instruction Format 0000 X110 0000 X100 0000 X101 0000 X001 0000 X011 0000 X010 Operation Set Write Enable Latch Reset Write Enable Latch Read Status Register Write Status Register Read Data from Memory Array Write Data to Memory Array Instruction Name WREN WRDI RDSR WRSR READ WRITE WRITE ENABLE (WREN): The device will power up in the write disable state when VCC is applied. All programming instructions must therefore be preceded by a Write Enable instruction. WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the Write Disable instruction disables all programming modes. The WRDI instruction is independent of the status of the WP pin. READ STATUS REGISTER (RDSR): The Read Status Register 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. Table 3-2. Bit 7 WPEN Status Register Format Bit 6 X Bit 5 X Bit 4 X Bit 3 BP1 Bit 2 BP0 Bit 1 WEN Bit 0 RDY Table 3-3. Bit Bit 0 (RDY) Bit 1 (WEN) Bit 2 (BP0) Bit 3 (BP1) Read Status Register Bit Definition Definition Bit 0 = “0” (RDY) indicates the device is READY. Bit 0 = “1” indicates the write cycle is in progress. Bit 1= “0” indicates the device is not WRITE ENABLED. Bit 1 = “1” indicates the device is write enabled. See Table 3-4 on page 8. See Table 3-4 on page 8. Bits 4–6 are “0”s when device is not in an internal write cycle. Bit 7 (WPEN) See Table 3-5 on page 8. Bits 0–7 are “1”s during an internal write cycle. 7 8535F–SEEPR–6/10 WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select one of four levels of protection. The Atmel® AT25320B/640B is divided into four array segments. One-quarter, one-half, or all of the memory segments can be protected. Any of the data within any selected segment will therefore be read only. The block write protection levels and corresponding status register control bits are shown in Table 3-4 on page 8. 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 3-4. Block Write Protect Bits Status Register Bits Level 0 1(1/4) 2(1/2) 3(All) BP1 0 0 1 1 BP0 0 1 0 1 Array Addresses Protected Atmel AT25320B None 0C000FFF 08000FFF 00000FFF Atmel AT25640B None 18001FFF 10001FFF 00001FFF 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 block-protected sections in the memory array are disabled. Writes are only allowed to sections of the memory that are not block-protected. 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 3-5. WPEN 0 0 1 1 X X WPEN Operation WP X X Low Low High High WEN 0 1 0 1 0 1 Protected Blocks Protected Protected Protected Protected Protected Protected Unprotected Blocks Protected Writeable Protected Writeable Protected Writeable Status Register Protected Writeable Protected Protected Protected Writeable READ SEQUENCE (READ): Reading the AT25320B/640B via the Serial Output (SO) pin requires the following sequence. After the CS line is pulled low to select a device, the read op-code is transmitted via the SI line followed by the byte address to be read (A15–A0, see Table 3-6). 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 sequence can be continued since the byte address is automatically incremented and data will continue to be shifted out. 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 cycle. 8 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B WRITE SEQUENCE (WRITE): In order to program the Atmel® AT25320B/640B, two separate instructions must be executed. First, the device must be write enabled via the WREN instruction. Then a write (WRITE) instruction may 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 write cycle, all commands will be ignored except the RDSR instruction. A write instruction requires the following sequence. After the CS line is pulled low to select the device, the WRITE op-code is transmitted via the SI line followed by the byte address (A15–A0) and the data (D7–D0) to be programmed (see Table 3-6). 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 read status register (RDSR) instruction. If Bit 0 = “1”, the write cycle is still in progress. If Bit 0 = “0”, the write cycle has ended. Only the RDSR instruction is enabled during the write programming cycle. The AT25320B/640B is capable of a 32-byte page write operation. After each byte of data is received, the five loworder address bits are internally incremented by one; the high-order bits of the address will remain constant. If more than 32-bytes of data are transmitted, the address counter will roll over and the previously written data will be overwritten. The AT25320B/640B is automatically returned to the write disable state at the completion of a write 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 reinitiate the serial communication. Table 3-6. Address Key Address AN Atmel AT25320B A11–A0 A15–A12 Atmel AT25640B A12–A0 A15–A13 Don’t Care Bits 9 8535F–SEEPR–6/10 4. Timing Diagrams Figure 4-1. VIH Synchronous Data Timing (for Mode 0) t CS CS VIL tCSS t CSH VIH SCK VIL t SU t WH t WL tH VIH SI VIL VALID IN tV t HO t DIS HI-Z VOH SO VOL HI-Z Figure 4-2. CS WREN Timing SCK SI WREN OP-CODE SO HI-Z Figure 4-3. CS WRDI Timing SCK SI WRDI OP-CODE SO HI-Z 10 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B Figure 4-4. CS RDSR Timing 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SCK SI INSTRUCTION DATA OUT SO HIGH IMPEDANCE 7 MSB 6 5 4 3 2 1 0 Figure 4-5. CS WRSR Timing 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SCK DATA IN SI INSTRUCTION 7 6 5 4 3 2 1 0 SO HIGH IMPEDANCE Figure 4-6. CS READ Timing 0 1 2 3 4 5 6 7 8 9 10 11 20 21 22 23 24 25 26 27 28 29 30 SCK BYTE ADDRESS SI INSTRUCTION 15 14 13 ... 3 2 1 0 DATA OUT SO HIGH IMPEDANCE 7 MSB 6 5 4 3 2 1 0 11 8535F–SEEPR–6/10 Figure 4-7. CS WRITE Timing 0 1 2 3 4 5 6 7 8 9 10 11 20 21 22 23 24 25 26 27 28 29 30 31 SCK BYTE ADDRESS DATA IN SI INSTRUCTION 15 14 13 ... 3 2 1 0 7 6 5 4 3 2 1 0 SO HIGH IMPEDANCE Figure 4-8. CS HOLD Timing t CD t CD SCK t HD HOLD t HD t HZ SO tLZ 12 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B 5. Ordering Code Detail AT25320B-SSHL-B Atmel Designator Shipping Carrier Option B or blank = Bulk (tubes) T = Tape and reel Product Family Operating Voltage L = 1.8V to 5.5V Device Density 320 = 32-kilobit 640 = 64-kilobit Packaged Device Grade or Wafer/Die Thickness H = Green, NiPdAu lead finish Industrial Temperature range (-40°C to +85°C) Green, matte Sn lead finish Industrial Temperature range (-40°C to +85°C) 11 mil wafer thickness Device Revision U = 11 = Package Option SS = X = MA = ME = C = WWU = WDT = JEDEC SOIC TSSOP UDFN XDFN VFBGA Wafer unsawn Die in Tape and Reel 13 8535F–SEEPR–6/10 6. 6.1 Part Markings Atmel AT25320B AT25320B-SSHL Top Mark Seal Year | Seal Week | | | |---|---|---|---|---|---|---|---| A T M L H Y W W |---|---|---|---|---|---|---|---| 5 B B L @ |---|---|---|---|---|---|---|---| * LOT NUMBER |---|---|---|---|---|---|---|---| | PIN 1 INDICATOR (DOT) @ = Country of Y = SEAL YEAR 6: 2006 0: 7: 2007 1: 8: 2008 2: 9: 2009 3: Ass’y 2010 2011 2012 2013 WW 02 04 :: :: 50 52 = = = : : = = SEAL Week Week :::: :::: Week Week WEEK 2 4 : :: 50 52 AT25320B-XHL Top Mark PIN 1 INDICATOR (DOT) | * |---|---|---|---|---|---| A T H Y W W |---|---|---|---|---|---| 5 B B L @ |---|---|---|---|---|---|---| ATMEL LOT NUMBER |---|---|---|---|---|---|---| @ = Country of Y = SEAL YEAR 8: 2008 2: 9: 2009 3: 0: 2010 4: 1: 2011 5: Ass’y 2012 2013 2014 2015 WW 02 04 :: :: 50 52 = = = : : = = SEAL Week Week :::: :::: Week Week WEEK 2 4 : :: 50 52 AT25320B-MAHL Top Mark |---|---|---| 5 B B |---|---|---| H L @ |---|---|---| Y X X |---|---|---| * | PIN 1 INDICATOR (DOT) Y = YEAR OF ASSEMBLY @ = Country of Ass’y XX= ATMEL LOT NUMBER TO COORESPOND WITH TRACE CODE LOG BOOK (e.g. XX = AA, AB, AC,... AX, AY AZ) Y = SEAL YEAR 6: 2006 0: 2010 7: 2007 1: 2011 8: 2008 2: 2012 9: 2009 3: 2013 14 Atmel AT25320B/640B 8535F–SEEPR–6/10 Atmel AT25320B/640B AT25320B-MEHL Top Mark |---|---|---| 5 B B |---|---|---| H L @ |---|---|---| Y X X |---|---|---| * | PIN 1 INDICATOR (DOT) Y = YEAR OF ASSEMBLY @ = Country of Ass’y XX= ATMEL LOT NUMBER TO COORESPOND WITH TRACE CODE LOG BOOK (e.g. XX = AA, AB, AC,... AX, AY AZ) Y = SEAL YEAR 6: 2006 0: 2010 7: 2007 1: 2011 8: 2008 2: 2012 9: 2009 3: 2013 AT25320B-CUL Top Mark |---|---|---|---| 5 B B U |---|---|---|---| B Y M X X |---|---|---|---|---| *