AT25320BSSHLT

AT25320B/AT25640B SPI Serial EEPROM 32 Kbits (4,096 x 8) and 64 Kbits (8,192 x 8) Features • • • • • • • • • • • • Serial Peripheral Interface (SPI) Compatible Supports SPI Modes 0 (0,0) and 3 (1,1): – Data sheet describes mode 0 operation Low-Voltage and Standard-Voltage Operation: – 1.8V (VCC = 1.8V to 5.5V) Industrial Temperature Range -40°C to +85°C 20 MHz 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 (5 ms Maximum) High Reliability: – Endurance: 1,000,000 write cycles – Data retention: 100 years Green (Pb/Halide-free/RoHS Compliant) Packaging Options Die Sales: Wafer Form and Bumped Wafers Packages • 8-Lead SOIC, 8-Lead TSSOP, 8-Pad UDFN, 8-Ball VFBGA and 8-Pad XDFN © 2018 Microchip Technology Inc. DS20005993A-page 1 AT25320B/AT25640B Table of Contents Features.......................................................................................................................... 1 Packages.........................................................................................................................1 1. Package Types (not to scale).................................................................................... 4 2. Pin Description.......................................................................................................... 5 2.1. 2.2. 2.3. 2.4. 2.5. 2.6. 2.7. 2.8. Chip Select (CS)...........................................................................................................................5 Serial Data Output (SO)............................................................................................................... 5 Write-Protect (WP)....................................................................................................................... 5 Ground (GND).............................................................................................................................. 6 Serial Data Input (SI)....................................................................................................................6 Serial Data Clock (SCK)...............................................................................................................6 Suspends Serial Input (HOLD).....................................................................................................6 Device Power Supply (VCC)......................................................................................................... 6 3. Description.................................................................................................................7 3.1. Block Diagram.............................................................................................................................. 7 4. Electrical Characteristics........................................................................................... 8 4.1. 4.2. 4.3. 4.4. 4.5. Absolute Maximum Ratings..........................................................................................................8 DC and AC Operating Range.......................................................................................................8 DC Characteristics....................................................................................................................... 8 AC Characteristics........................................................................................................................9 Electrical Specifications..............................................................................................................11 5. Serial Interface Description..................................................................................... 13 6. Functional Description............................................................................................. 14 7. Timing Diagrams......................................................................................................17 8. Packaging Information.............................................................................................20 8.1. Package Marking Information.....................................................................................................20 9. Revision History.......................................................................................................31 The Microchip Web Site................................................................................................ 32 Customer Change Notification Service..........................................................................32 Customer Support......................................................................................................... 32 Product Identification System........................................................................................ 33 Microchip Devices Code Protection Feature................................................................. 34 © 2018 Microchip Technology Inc. DS20005993A-page 2 AT25320B/AT25640B Legal Notice...................................................................................................................34 Trademarks................................................................................................................... 34 Quality Management System Certified by DNV.............................................................35 Worldwide Sales and Service........................................................................................36 © 2018 Microchip Technology Inc. DS20005993A-page 3 AT25320B/AT25640B Package Types (not to scale) 1. Package Types (not to scale) 8-Lead SOIC/TSSOP (Top View) CS 1 8-Pad UDFN/XDFN (Top View) VCC 8 SO 2 7 HOLD WP 3 6 SCK GND 4 5 SI CS 1 8 VCC SO 2 7 HOLD WP 3 6 SCK GND 4 5 SI 8-Ball VFBGA (Top View) © 2018 Microchip Technology Inc. CS 1 8 VCC SO 2 7 HOLD WP 3 6 SCK GND 4 5 SI DS20005993A-page 4 AT25320B/AT25640B Pin Description 2. Pin Description The descriptions of the pins are listed in Table 2-1. Table 2-1. Pin Function Table Name 8-Lead SOIC 8-Lead TSSOP 8-Pad UDFN(1) 8-Pad XDFN 8-Ball VFBGA Function CS 1 1 1 1 1 Chip Select SO 2 2 2 2 2 Serial Data Output WP(2) 3 3 3 3 3 Write-Protect GND 4 4 4 4 4 Ground SI 5 5 5 5 5 Serial Data Input SCK 6 6 6 6 6 Serial Data Clock HOLD(2) 7 7 7 7 7 Suspends Serial Input VCC 8 8 8 8 8 Device Power Supply Note:  1. The exposed pad on this package can be connected to GND or left floating. 2. The Write-Protect (WP) and Hold (HOLD) pins should be driven high or low as appropriate. 2.1 Chip Select (CS) The AT25320B/AT25640B 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 (SO) pin will remain in a high-impedance state. To ensure robust operation, the Chip Select (CS) pin should follow VCC upon power-up. It is therefore recommended to connect CS to VCC using a pull-up resistor (less than or equal to 10 kΩ). After power-up, a low level on CS is required prior to any sequence being initiated. 2.2 Serial Data Output (SO) The Serial Data Output (SO) pin is used to transfer data out of the AT25320B/AT25640B. During a read sequence, data is shifted out on this pin after the falling edge of the serial clock. 2.3 Write-Protect (WP) The Write-Protect (WP) pin will allow normal read/write operations when held high. When the WP pin is brought low and WPEN bit is set to a logic '1', all write operations to the STATUS register are inhibited. WP going low while CS is still low will interrupt a write operation 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 set to a logic '0'. This will allow the user to install the AT25320B/AT25640B 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 a logic '1'. © 2018 Microchip Technology Inc. DS20005993A-page 5 AT25320B/AT25640B Pin Description 2.4 Ground (GND) The ground reference for the power supply. The Ground (GND) pin should be connected to the system ground. 2.5 Serial Data Input (SI) The Serial Data Input (SI) pin is used to transfer data into the device. It receives instructions, addresses and data. Data is latched on the rising edge of the serial clock. 2.6 Serial Data Clock (SCK) The Serial Data Clock (SCK) pin is used to synchronize the communication between a master and the AT25320B/AT25640B. Instructions, addresses or data present on the SI pin are latched on the rising edge of the clock input, while data on the SO pin is updated after the falling edge of the clock input. 2.7 Suspends Serial Input (HOLD) The HOLD pin is used in conjunction with the CS pin to pause the AT25320B/AT25640B. 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. 2.8 Device Power Supply (VCC) The Device Power Supply (VCC) pin is used to supply the source voltage to the device. Operations at invalid VCC voltages may produce spurious results and should not be attempted. © 2018 Microchip Technology Inc. DS20005993A-page 6 AT25320B/AT25640B Description 3. Description The AT25320B/AT25640B provides 32,768/65,536 bits of Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) organized as 4,096/8,192 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/AT25640B is enabled through the Chip Select (CS) pin 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 to the STATUS register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence. Block Diagram Memory System Control Module CS High-Voltage Generation Circuit Power-on Reset Generator VCC Pause Operation Control HOLD Register Bank: STATUS Register SO EEPROM Array 1 page WP Column Decoder Data Register Row Decoder 3.1 Address Register and Counter SCK Data Output Buffer GND © 2018 Microchip Technology Inc. Write Protection Control SI DS20005993A-page 7 AT25320B/AT25640B Electrical Characteristics 4. Electrical Characteristics 4.1 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 VCC 6.25V DC output current 5.0 mA ESD protection 2 kV Note:  Stresses above 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 above those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 4.2 DC and AC Operating Range Table 4-1. DC and AC Operating Range AT25320B/AT25640B 4.3 Operating Temperature (Case) Industrial Temperature Range -40°C to +85°C VCC Power Supply Low Voltage Grade 1.8V to 5.5V DC Characteristics Table 4-2. DC Characteristics (1) Parameter Symbol Minimum Typical Maximum Units Conditions Supply Voltage VCC1 1.8 — 5.5 V Supply Voltage VCC2 2.5 — 5.5 V Supply Voltage VCC3 4.5 — 5.5 V Supply Current ICC1 — 7.5 10.0 mA VCC = 5.0V at 20 MHz, SO = Open, Read Supply Current ICC2 — 4.0 10.0 mA VCC = 5.0V at 20 MHz, SO = Open, Read, Write Supply Current ICC3 — 4.0 6.0 mA VCC = 5.0V at 5 MHz, SO = Open, Read, Write Standby Current ISB1 —