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X24640S8I Datasheet(PDF) 1 Page - Xicor Inc. |
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X24640S8I Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 17 page  400KHz 2-Wire Serial E2PROM with Block LockTM 64K 8K x 8 Bit ©Xicor, 1995, 1996 Patents Pending Characteristics subject to change without notice 7038-1.2 4/25/97 T0/C2/D0 SH 1 X24640 FUNCTIONAL DIAGRAM FEATURES • Save Critical Data with Programmable Block Lock Protection —Block Lock (0, 1/4, 1/2, or all of E2PROM Array) —Software Program Protection —Programmable Hardware Write Protect • In Circuit Programmable ROM Mode • 400KHz 2-Wire Serial Interfac —Schmitt Trigger Input Noise Suppression —Output Slope Control for Ground Bounce Noise Elimination • Longer Battery Life With Lower Power —Active Read Current Less Than 1mA —Active Program Current Less Than 3mA —Standby Current Less Than 1 µA • 1.8V to 3.6V, 2.5V to 5.5V and 4.5V to 5.5V Power Supply Versions • 32 Word Page Write Mode —Minimizes Total Write Time Per Word • Internally Organized 8K x 8 • Bidirectional Data Transfer Protocol • Self-Timed Write Cycle —Typical Write Cycle Time of 5ms • High Reliability —Endurance: 100,000 Cycles —Data Retention: 100 Years • 8-Lead SOIC • 20-Lead TSSOP • 8-Lead PDIP DESCRIPTION The X24640 is a CMOS Serial E2PROM, internally organized 8K x 8. The device features a serial inter- face and software protocol allowing operation on a simple two wire bus. The bus operates at 400 KHz all the way down to 1.8V. Three device select inputs (S0–S2) allow up to eight devices to share a common two wire bus. A Write Protect Register at the highest address loca- tion, FFFFh, provides three write protection features: Software Write Protect, Block Lock Protect, and Programmable Hardware Write Protect. The Software Write Protect feature prevents any nonvolatile writes to the device until the WEL bit in the Write Protect Register is set. The Block Lock Protection feature gives the user four array block protect options, set by programming two bits in the Write Protect Register. The Programmable Hardware Write Protect feature allows the user to install the device with WP tied to VCC, program and Block Lock the desired portions of the memory array in circuit, and then enable the In Circuit Programmable ROM Mode by programming the WPEN bit in the Write Protect Register. After this, the Block Locked portions of the array, including the Write Protect Register itself, are permanently protected from being erased. SERIAL E2PROM DATA AND ADDRESS (SDA) SCL S2 S1 S0 WP COMMAND DECODE AND CONTROL LOGIC BLOCK LOCK AND WRITE PROTECT CONTROL LOGIC DEVICE SELECT LOGIC WRITE PROTECT REGISTER PAGE DECODE LOGIC DATA REGISTER Y DECODE LOGIC 2K x 8 2K x 8 4K x 8 WRITE VOLTAGE CONTROL SERIAL E2PROM ARRAY 8K x 8 7038 FM 01 |
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