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Features
* Serial Peripheral Interface (SPI) Compatible * Supports SPI Modes 0(0,0) and 3(1,1) * Low-Voltage and Standard-Voltage Operation
- 5.0 (VCC = 4.5V to 5.5V) - 2.7 (VCC = 2.7V to 5.5V) - 1.8 (VCC = 1.8V to 3.6V) 2.1 MHz Clock Rate (5V) Compatibility 8-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 (10 ms Max) High Reliability - Endurance: 1 Million Write Cycles - Data Retention: 100 Years - ESD Protection: >4000V Automotive Grade and Extended Temperature Devices Available 8-Pin PDIP and JEDEC SOIC Packages
* * * * * *
SPI Serial EEPROMs
1K (128 x 8) 2K (256 x 8) 4K (512 x 8)
* *
Description
The AT25010/020/040 provides 1024/2048/4096 bits of serial electrically erasable programmable read only memory (EEPROM) organized as 128/256/512 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 AT25010/020/040 is available in space saving 8-pin PDIP and 8-pin JEDEC (SOIC) packages. The AT25010/020/040 is enabled through the Chip Select pin (CS) and accessed via a 3-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. 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. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence.
AT25010 AT25020 AT25040
Pin Configurations
Pin Name CS SCK SI SO GND VCC WP HOLD Function Chip Select Serial Data Clock Serial Data Input Serial Data Output Ground Power Supply Write Protect Suspends Serial Input
CS SO WP GND 1 2 3 4 8 7 6 5 VCC HOLD SCK SI CS SO WP GND
8-Pin PDIP
1 2 3 4 8 7 6 5 VCC HOLD SCK SI
SPI, 1K Serial E2PROM
8-Pin SOIC
Rev. 0606E-08/98
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Absolute Maximum Ratings*
Operating Temperature ................................. -55C to + 125C Storage Temperature .................................... -65C to + 150C 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
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AT25010/020/040
AT25010/020/040
Pin Capacitance (1)
Applicable over recommended operating range from TA = 25C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted).
Test Conditions COUT CIN Note: 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
DC Characteristics
Applicable over recommended operating range from: TAI = -40C to +85C, VCC = +1.8V to +5.5V, TAC = 0C to +70C, VCC = +1.8V to +5.5V (unless otherwise noted).
Symbol VCC1(1) VCC2 VCC3 ICC1 ICC2 ISB1(1) ISB2 ISB3 IIL IOL VIL
(2) (2)
Parameter Supply Voltage Supply Voltage Supply Voltage 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 2.7 4.5
Max 5.5 5.5 5.5 3.0 6.0 100 100 100
Units V V V mA mA A A A A A V V V V
VCC = 5.0V at 1 MHz, SO = Open VCC = 5.0V at 2 MHz, SO = Open VCC = 1.8V VCC = 2.7V VCC = 5.0V VIN = 0V to VCC VIN = 0V to VCC, TAC = 0C to 70C CS = VCC CS = VCC CS = VCC -0.6 -0.6 -0.6 VCC x 0.7 4.5V VCC 5.5V 1.8V VCC 3.6V IOL = 2.0 mA IOH = -1.0 mA IOL = 0.15 mA IOH = -100 A VCC - 0.2 VCC - 0.8
3.0 3.0 VCC x 0.3 VCC + 0.5 0.4
VIH
VOL1 VOH1 VOL2 VOH2 Notes:
0.2
V V
1. This parameter is preliminary and Atmel may change the specifications upon further characterization. 2. VIL min and VIH max are reference only and are not tested.
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AC Characteristics
Applicable over recommended operating range from TA = -40C to +85C, VCC = As Specified, CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol fSCK Parameter SCK Clock Frequency Voltage 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 200 200 800 200 200 800 250 250 1000 250 250 1000 250 250 1000 50 50 100 50 100 100 100 100 400 200 200 400 0 0 0 0 0 0 200 400 800 Min 0 0 0 Max 2.1 2.1 0.5 2 2 2 2 2 2 Units MHz
tRI
Input Rise Time
s
tFI
Input Fall Time
s
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
ns
tCD
Hold Hold Time
ns
tV
Output Valid
ns
tHO
Output Hold Time
ns
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AT25010/020/040
AT25010/020/040
AC Characteristics (Continued)
Applicable over recommended operating range from TA = -40C to +85C, VCC = As Specified, CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol tLZ Parameter Hold to Output Low Z Voltage 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 4.5 - 5.5 2.7 - 5.5 1.8 - 3.6 1M Min 0 0 0 Max 100 100 100 100 100 100 250 500 1000 10 ms Write Cycles Units ns
tHZ
Hold to Output High Z
ns
tDIS
Output Disable Time
ns
tWC Endurance Note:
Write Cycle Time 5.0V, 25C, Page Mode
1. This parameter is characterized and is not 100% tested.
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Serial Interface Description
MASTER: The device that generates the serial clock. SLAVE: Because the Serial Clock pin (SCK) is always an input, the AT25010/020/040 always operates as a slave. TRANSMITTER/RECEIVER: The AT25010/020/040 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. The op-code also contains address bit A8 in both the READ and WRITE instructions. INVALID OP-CODE: If an invalid op-code is received, no data will be shifted into the AT25010/020/040, 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 AT25010/020/040 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 AT25010/020/040. 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, all write operations are inhibited.
WP going low while CS is still low will interrupt a write to the AT25010/020/040. If the internal write cycle has already been initiated, WP going low will have no effect on any write operation.
SPI Serial Interface
6
AT25010/020/040
AT25010/020/040
Functional Description
The AT25010/020/040 is designed to interface directly with the synchronous serial peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers. The AT25010/020/040 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 CS transition. Table 1. Instruction Set for the AT25010/020/040
Instruction Name WREN WRDI RDSR WRSR READ WRITE Note: Instruction Format 0000 X110 0000 X100 0000 X101 0000 X001 0000 A011 0000 A010 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
Table 3. Read Status Register Bit Definition
Bit Bit 0 (RDY) 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 4. See Table 4.
Bit 1 (WEN) Bit 2 (BP0) Bit 3 (BP1)
Bits 4-7 are 0s when device is not in an internal write cycle. Bits 0-7 are 1s during an internal write cycle.
"A" represents MSB address bit A8.
WRITE ENABLE (WREN): The device will power up in the write disable state when V CC is applied. All programming instructions must therefore be preceded by a Write Enable instruction. The WP pin must be held high during a WREN 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 2. Status Register Format
Bit 7 X Bit 6 X Bit 5 X Bit 4 X Bit 3 BP1 Bit 2 BP0 Bit 1 WEN Bit 0 RDY
WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select one of four levels of protection. The AT25010/020/040 is divided into four array segments. Top quarter (1/4), Top half (1/2), 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 4. The two bits, BP1 and BP0 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 Level 0 1 (1/4) 2 (1/2) 3 (All) BP1 0 0 1 1 BP0 0 1 0 1 Array Addresses Protected AT25010 None 60-7F 40-7F 00-7F AT25020 None C0-FF 80-FF 00-FF AT25040 None 180-1FF 100-1FF 000-1FF
READ SEQUENCE (READ): Reading the AT25010/020/040 via the SO (Serial Output) pin requires the following sequence. After the CS line is pulled low to select a device, the READ op-code (including A8) is transmitted via the SI line followed by the byte address to be read (A7-A0). 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.
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WRITE SEQUENCE (WRITE): In order to program the AT25010/020/040, the Write Protect pin (WP) must be held high and two separate instructions must be executed. First, the device must be write enabled via the Write Enable (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 (including A8) is transmitted via the SI line followed by the byte address (A7-A0) and the data (D7-D0) to be programmed. 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) Instruc-
tion. If Bit 0 = 1, the WRITE cycle is still in progress. If Bit 0 = 0, the WRITE cycle has ended. Only the READ STATUS REGISTER instruction is enabled during the WRITE programming cycle. The AT25010/020/040 is capable of an 8-byte PAGE WRITE operation. After each byte of data is received, the three low order address bits are internally incremented by one; the six high order bits of the address will remain constant. If more than 8 bytes of data are transmitted, the address counter will roll over and the previously written data will be overwritten. The AT25010/020/040 is automatically returned to the write disable state at the completion of a WRITE cycle.
Note: If the WP pin is brought low or 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.
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AT25010/020/040
AT25010/020/040
Timing Diagrams
Synchronous Data Timing (for mode 0)
VIH CS VIL t CSS VIH SCK VIL t SU VIH SI VIL tV VOH SO VOL HI-Z t HO t DIS HI-Z VALID IN tH t WH t WL t CSH t CS
WREN Timing
WRDI Timing
9
RDSR Timing
CS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
SCK
INSTRUCTION SI
SO
HIGH IMPEDANCE
DATA OUT
7 6 5 4 3 2 1 0
MSB
WRSR Timing
CS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SCK
INSTRUCTION SI
7 6 5
DATA IN
4 3 2 1 0
SO
HIGH IMPEDANCE
READ Timing
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AT25010/020/040
AT25010/020/040
WRITE Timing
CS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
INSTRUCTION SI
8 7
BYTE ADDRESS
6 5 4 3 2 1 0 7 6 5
DATA IN
4 3 2 1 0
9TH BIT OF ADDRESS HIGH IMPEDANCE
SO
HOLD Timing
CS
tCD tCD
SCK
tHD
HOLD
tHZ
tHD
SO
tLZ
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AT25010 Ordering Information
tWP (max) (ms) 10 ICC (max) (A) 6000 ISB (max) (A) 100 100 10 3000 100 100 10 3000 100 100 fMAX (kHz) 2000 2000 1000 1000 500 500 Ordering Code AT25010-10PC AT25010-10SC AT25010-10PI AT25010-10SI AT25010-10PC-2.7 AT25010-10SC-2.7 AT25010-10PI-2.7 AT25010-10SI-2.7 AT25010-10PC-1.8 AT25010-10SC-1.8 AT25010-10PI-1.8 AT25010-10SI-1.8 Package 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 Operation Range Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C)
Package Type 8P3 8S1 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) Options Blank -2.7 -1.8 Standard Device (4.5V to 5.5V) Low Voltage (2.7V to 5.5V) Low Voltage (1.8V to 5.5V)
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AT25010/020/040
AT25010/020/040
AT25020 Ordering Information
tWP (max) (ms) 10 ICC (max) (A) 6000 ISB (max) (A) 100 100 10 3000 100 100 10 3000 100 100 fMAX (kHz) 2100 2100 2100 2100 500 500 Ordering Code AT25020-10PC AT25020N-10SC AT25020-10PI AT25020N-10SI AT25020-10PC-2.7 AT25020N-10SC-2.7 AT25020-10PI-2.7 AT25020N-10SI-2.7 AT25020-10PC-1.8 AT25020N-10SC-1.8 AT25020-10PI-1.8 AT25020N-10SI-1.8 Package 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 Operation Range Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C)
Package Type 8P3 8S1 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) Options Blank -2.7 -1.8 Standard Device (4.5V to 5.5V) Low Voltage (2.7V to 5.5V) Low Voltage (1.8V to 5.5V)
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AT25040 Ordering Information
tWP (max) (ms) 10 ICC (max) (A) 6000 ISB (max) (A) 100 100 10 3000 100 100 10 3000 100 100 fMAX (kHz) 2100 2100 2100 2100 500 500 Ordering Code AT25040-10PC AT25040N-10SC AT25040-10PI AT25040N-10SI AT25040-10PC-2.7 AT25040N-10SC-2.7 AT25040-10PI-2.7 AT25040N-10SI-2.7 AT25040-10PC-1.8 AT25040N-10SC-1.8 AT25040-10PI-1.8 AT25040N-10SI-1.8 Package 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 8P3 8S1 Operation Range Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C)
Package Type 8P3 8S1 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) Options Blank -2.7 -1.8 Standard Device (4.5V to 5.5V) Low Voltage (2.7V to 5.5V) Low Voltage (1.8V to 5.5V)
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AT25010/020/040
AT25010/020/040
Packaging Information
8P3, 8-Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP) Dimensions in Inches and (Millimeters)
JEDEC STANDARD MS-001 BA
.400 (10.16) .355 (9.02) PIN 1 .280 (7.11) .240 (6.10) .037 (.940) .027 (.690)
8S1, 8-Lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC) Dimensions in Inches and (Millimeters)
.020 (.508) .013 (.330)
PIN 1
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.300 (7.62) REF
.050 (1.27) BSC
.210 (5.33) MAX SEATING PLANE .150 (3.81) .115 (2.92) .070 (1.78) .045 (1.14) .015 (.380) MIN .022 (.559) .014 (.356) .100 (2.54) BSC
.196 (4.98) .189 (4.80) .068 (1.73) .053 (1.35)
.325 (8.26) .300 (7.62) .012 (.305) .008 (.203) 0 REF 15 .430 (10.9) MAX
.010 (.254) .004 (.102) 0 REF 8 .050 (1.27) .016 (.406) .010 (.254) .007 (.203)
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