25lc640 Microchip Technology Inc., 25lc640 Datasheet
25lc640
Available stocks
Related parts for 25lc640
25lc640 Summary of contents
Page 1
... PDIP/SOIC *25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices. © 2008 Microchip Technology Inc. Not recommended for new designs – Please use 25AA640A or 25LC640A. 25AA640/25LC640 Description: Temp The Microchip Technology Inc. 25AA640/25LC640 Ranges * ...
Page 2
... ELECTRICAL CHARACTERISTICS (†) Absolute Maximum Ratings V .............................................................................................................................................................................7.0V CC All inputs and outputs w.r.t. V ........................................................................................................ -0. Storage temperature .................................................................................................................................-65°C to 150°C Ambient temperature under bias ...............................................................................................................-65°C to 125°C ESD protection on all pins ..........................................................................................................................................4 kV † NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device ...
Page 3
... A 3: This parameter is not tested but established by characterization. For endurance estimates in a specific application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site at: www.microchip.com. © 2008 Microchip Technology Inc. 25AA640/25LC640 Industrial (I -40°C to +85°C ...
Page 4
... FIGURE 1-1: HOLD TIMING CS SCK HOLD FIGURE 1-2: SERIAL INPUT TIMING CS 2 Mode 1,1 Mode 0,0 SCK MSB In High-Impedance SO FIGURE 1-3: SERIAL OUTPUT TIMING SCK 13 MSB Out SO SI DS21223H-page High-Impedance n Don’t Care Don’ ...
Page 5
... TABLE 1-3: AC TEST CONDITIONS AC Waveform 0. – 0. 4.0V HI Timing Measurement Reference Level Input Output ≤ 4.0V Note 1: For For V > 4.0V CC © 2008 Microchip Technology Inc. 25AA640/25LC640 FIGURE 1-4: (Note 1) (Note TEST CIRCUIT V CC 2.25 kΩ 100 pF 1.8 kΩ DS21223H-page 5 ...
Page 6
... PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Name PDIP SOIC TSSOP SCK HOLD 2.1 Chip Select (CS) A low level on this pin selects the device. A high level deselects the device and forces it into Standby mode ...
Page 7
... RDSR 0000 0101 WRSR 0000 0001 © 2008 Microchip Technology Inc. 25AA640/25LC640 3.3 Write Sequence Prior to any attempt to write data to the 25XX640 array or STATUS register, the write enable latch must be set by issuing the WREN instruction (Figure 3-4). This is done by setting CS low and then clocking out the proper instruction into the 25XX640 ...
Page 8
... FIGURE 3-1: READ SEQUENCE SCK Instruction High-Impedance SO FIGURE 3-2: BYTE WRITE SEQUENCE CS Instruction High-Impedance SO FIGURE 3-3: PAGE WRITE SEQUENCE SCK Instruction ...
Page 9
... WRITE DISABLE SEQUENCE CS SCK SI SO © 2008 Microchip Technology Inc. 25AA640/25LC640 The following is a list of conditions under which the write enable latch will be reset: • Power-up • WRDI instruction successfully executed • WRSR instruction successfully executed • WRITE instruction successfully executed ...
Page 10
... Read Status Register Instruction (RDSR) The Read Status Register instruction (RDSR) provides access to the STATUS register. The STATUS register may be read at any time, even during a write cycle. The STATUS register is formatted as follows WPEN BP1 BP0 The Write-In-Process (WIP) bit indicates whether the 25XX640 is busy with a write operation. When set to a ‘ ...
Page 11
... See Table 3-3 for a matrix of functionality on the WPEN bit. See Figure 3-7 for WRSR timing sequence. FIGURE 3-7: WRITE STATUS REGISTER TIMING SEQUENCE SCK Instruction © 2008 Microchip Technology Inc. 25AA640/25LC640 TABLE 3-2: BP1 Data to STATUS Register ...
Page 12
... Data Protection The following protection has been implemented to prevent inadvertent writes to the array: • The write enable latch is reset on power-up • A write enable instruction must be issued to set the write enable latch • After a byte write, page write, or STATUS register write, the write enable latch is reset • ...
Page 13
... Standard marking consists of Microchip part number, year code, week code, traceability code (facility code, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Please check with your Microchip Sales Office. © 2008 Microchip Technology Inc. 25AA640/25LC640 Example: 25LC640 /P017 0410 Example: 25LC640 I/SN0410 017 Example: 5LCX 0410 017 ...
Page 14
... DS21223H-page 14 PLO %RG\ >3',3@ © 2008 Microchip Technology Inc. ...
Page 15
... Microchip Technology Inc. 25AA640/25LC640 PP %RG\ >62,&@ α φ β DS21223H-page 15 ...
Page 16
... DS21223H-page 16 PP %RG\ >62,&@ © 2008 Microchip Technology Inc. ...
Page 17
... Microchip Technology Inc. 25AA640/25LC640 PP %RG\ >76623@ φ I DS21223H-page 17 ...
Page 18
... APPENDIX A: REVISION HISTORY Revision F Corrections to Section 1.0, Electrical Characteristics. Revision G Product ID System, Example C: Corrected part number, added “Alternate Pinout” and corrected part number in Header. Updated Trademark and Sales List pages. Revision H (June 2008) Added “Not Recommended” note; Updated Packaging; ...
Page 19
... To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions. © 2008 Microchip Technology Inc. 25AA640/25LC640 CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: • Distributor or Representative • ...
Page 20
... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: 25AA640/25LC640 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this document easy to follow? If not, why? 4 ...
Page 21
... SPI Serial EEPROM 25LC640T: 64K bit 2.5V SPI Serial EEPROM (Tape and Reel) 25LC640X: 64K bit 2.5V SPI Serial EEPROM in alternate pinout (ST only) 25LC640XT: 64K bit 2.5V SPI Serial EEPROM in alternate pinout Tape and Reel (ST only) Temperature Range I = -40°C to +85° -40° ...
Page 22
... NOTES: DS21223H-page 22 © 2008 Microchip Technology Inc. ...
Page 23
... Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. © 2008 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K ...
Page 24
... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2008 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...