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X24645 Dataheets PDF



Part Number X24645
Manufacturers Xicor
Logo Xicor
Description Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection
Datasheet X24645 DatasheetX24645 Datasheet (PDF)

Preliminary Information 64K X24645 DESCRIPTION 8192 x 8 Bit Advanced 2-Wire Serial E2PROM with Block LockTM Protection FEATURES The X24645 is a CMOS 65,536-bit serial E2PROM, internally organized 8192 x 8. The X24645 features a serial interface and software protocol allowing operation on a simple two wire bus. Two device select inputs (S1, S2) allow up to four devices to share a common two wire bus. A Write Protect Register at the highest address location, 1FFFh, provides three new write prot.

  X24645   X24645


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Preliminary Information 64K X24645 DESCRIPTION 8192 x 8 Bit Advanced 2-Wire Serial E2PROM with Block LockTM Protection FEATURES The X24645 is a CMOS 65,536-bit serial E2PROM, internally organized 8192 x 8. The X24645 features a serial interface and software protocol allowing operation on a simple two wire bus. Two device select inputs (S1, S2) allow up to four devices to share a common two wire bus. A Write Protect Register at the highest address location, 1FFFh, provides three new write protection features: Software Write Protect, Block Write Protect, and Hardware Write Protect. The Software Write Protect feature prevents any nonvolatile writes to the X24645 until the WEL bit in the write protect register is set. The Block Write Protection feature allows the user to individually write protect four blocks of the array by programming two bits in the write protect register. The Programmable Hardware Write Protect feature allows the user to install the X24645 with WP tied to VCC, program the entire memory array in place, and then enable the hardware write protection by programming a WPEN bit in the write protect register. After this, selected blocks of the array, including the write protect register itself, are permanently write protected, as long as WP remains HIGH. • • • • • • • • • • • 2.7V to 5.5V Power Supply Low Power CMOS —Active Read Current Less Than 1mA —Active Write Current Less Than 3mA —Standby Current Less Than 1µA Internally Organized 8192 x 8 New Programmable Block Lock Protection —Software Write Protection —Programmable hardware Write Protect Block Lock (0, 1/4, 1/2, or all of the E2PROM array) 2 Wire Serial Interface Bidirectional Data Transfer Protocol 32 Byte Page Write Mode —Minimizes Total Write Time Per Byte Self Timed Write Cycle —Typical Write Cycle Time of 5ms High Reliability —Endurance: 100,000 Cycles —Data Retention: 100 Years Available Packages —8-Lead PDIP —8-Lead SOIC (JEDEC) —14-Lead SOIC (JEDEC) —20-Lead TSSOP FUNCTIONAL DIAGRAM WP START CYCLE VCC VSS SDA START STOP LOGIC CONTROL LOGIC SLAVE ADDRESS REGISTER +COMPARATOR XDEC E2PROM 256 X 256 WRITE PROTECT REGISTER AND LOGIC H.V. GENERATION TIMING & CONTROL SCL LOAD INC S2 S1 R/W WORD ADDRESS COUNTER YDEC 8 CK PIN DOUT ACK 2783 ILL F01 DATA REGISTER DOUT ©Xicor, 1995, 1996 Patents Pending 2783-3.5 5/13/96 T1/C0/D0 NS 1 Characteristics subject to change without notice X24645 Xicor E2PROMs are designed and tested for applications requiring extended endurance. Inherent data retention is greater than 100 years. PIN DESCRIPTIONS Serial Clock (SCL) The SCL input is used to clock all data into and out of the device. Serial Data (SDA) SDA is a bidirectional pin used to transfer data into and out of the device. It is an open drain output and may be wire-ORed with any number of open drain or open collector outputs. An open drain output requires the use of a pull-up resistor. For selecting typical values, refer to the Pullup resistor selection graph at the end of this data sheet. Device Select (S1, S2) The device select inputs (S1, S2) are used to set the first and second bits of the 8-bit slave address. This allows up to four X24645 devices to share a common bus. These inputs can be static or actively driven. If used statically they must be tied to VSS or VCC as appropriate. If actively driven, they must be driven with CMOS levels (driven to VCC or VSS). Write Protect (WP) The write protect input controls the hardware write protect feature. When held LOW, hardware write protection is disabled and the X24645 can be written normally. When this input is held HIGH, and the WPEN bit in the write protect register is set HIGH, write protection is enabled, and nonvolatile writes are disabled to the selected blocks as well as the write protect register itself. PIN NAMES Symbol S1, S2 SDA SCL WP VSS VCC NC NC NC S1 NC NC NC S2 VSS NC NC PIN CONFIGURATIONS 8-LEAD DIP & SOIC NC S1 S2 VSS 1 2 3 4 X24645 8 7 6 5 VCC WP SCL SDA 14-LEAD SOIC NC NC NC S1 S2 VSS NC 1 2 3 4 5 6 7 14 13 12 X24645 11 10 9 8 NC NC VCC WP SCL SDA NC 20-LEAD TSSOP 1 2 3 4 5 6 7 8 9 10 X24645 20 19 18 17 16 15 14 13 12 11 NC VCC WP NC NC NC SCL SDA NC NC 2783 ILL F02.4 Description Device Select Inputs Serial Data Serial Clock Write Protect Ground Supply Voltage No Connect 2783 FRM T01.1 2 X24645 DEVICE OPERATION The X24645 supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers, and provide the clock for both transmit and receive operations. Therefore, the X24645 will be considered a slave in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Refer to Figures 1 and 2.


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