x24c44 Intersil Corporation, x24c44 Datasheet
x24c44
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x24c44 Summary of contents
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... COPS is a trademark of National Semiconductor Corp. © Xicor, Inc. 1991, 1995, 1996 Patents Pending 3832-1.5 6/19/96 T2/C1/D1 NS X24C44 DESCRIPTION The Xicor X24C44 is a serial 256 bit NOVRAM featuring a static RAM configured 16 x 16, overlaid bit-by-bit with 2 a nonvolatile E with Xicor’s Advanced CMOS Floating Gate technology. ...
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... The Chip Enable input must be HIGH to enable all read/ write operations. CE must remain HIGH following a Read or Write command until the data transfer is com- plete. CE LOW places the X24C44 in the low power standby mode and resets the instruction register. There- fore, CE must be brought LOW after the completion of an operation in order to reset the instruction register in preparation for the next command ...
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... The X24C44 requires the instruction to be shifted in with the MSB first. After CE is HIGH, the X24C44 will not begin to interpret the data stream until a logic “1” has been shifted in on DI. Therefore, CE may be brought HIGH with SK running and DI LOW ...
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... Because the X24C44 is a low power CMOS device, the SLEEP instruction implemented on the first generation NMOS device has been deleted. For systems convert- ing from the X2444 to the X24C44 the software need not be changed; the instruction will be ignored. WRITE PROTECTION The X24C44 provides two software write protection mechanisms to prevent inadvertent stores of unknown data ...
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... X24C44 Figure 1. RAM Read HIGH Z DO *Bit 8 of Read Instructions is Don’t Care Figure 2. RAM Write Figure 3. Non-Data Operations ...
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... X24C44 Figure 4. X24C44 State Diagram POWER ON RAM READ ENABLED RAM READ ENABLED STO OR WRDS CMD OR STORE RAM READ & WRITE STORE ENABLED POWER-UP RECALL RAM READ RCL COMMAND OR RECALL RAM READ WREN COMMAND RAM READ OR WRITE 3832 FHD F10.1 6 ...
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... A –1 0 0.4 V 2.4 V Min. 100,000 1,000,000 100 = 5V CC Parameter 7 Limits X24C44 5V 10% Test Conditions SK = 0.4V/2.4V Levels @ 1MHz Open, All Other Inputs = Open All Other Inputs = Open All Other Inputs = V – 0. ...
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... X24C44 EQUIVALENT A.C. LOAD CIRCUIT 5V 919 OUTPUT 497 A.C. CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Read and Write Cycle Limits Symbol SK ( Frequency t SK Positive Pulse Width SKH t SK Negative Pulse Width SKL t Data Setup Time DS t Data Hold Time ...
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... X24C44 Write Cycle SK CYCLE # t SKH CES Read Cycle SK CYCLE # HIGH SKL CEH DON’T CARE t PD1 CDS 3832 FHD F03 HIGH 3832 FHD F04 ...
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... ARRAY RECALL LIMITS Symbol t Recall Cycle Time RCC t Recall Pulse Width RCP t Recall to Output in High Z RCZ Recall Timing RECALL DO Notes: (5) NOP designates when the X24C44 is not currently executing an instruction. (6) Recall rise time must be <10 s. Software RECALL Instruction 1 0 NOP 1 1 RCL 0 1 NOP ...
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... X24C44 STORE CYCLE LIMITS Symbol t Store Time ST t Store Pulse Width STP Output in High Store Inhibit CC Store Timing CE STORE DO Note: (7) Typical values are for and nominal supply voltage. A SYMBOL TABLE WAVEFORM INPUTS Must be steady May change from LOW ...
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... X24C44 PACKAGING INFORMATION 8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P HALF SHOULDER WIDTH ON ALL END PINS OPTIONAL 0.015 (0.38) MAX. TYP. 0.010 (0.25) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 0.430 (10.92) 0.360 (9.14) 0.092 (2.34) DIA. NOM. PIN 1 INDEX PIN 1 0.300 (7.62) REF. SEATING PLANE 0.150 (3.81) 0.125 (3.18) 0.110 (2.79) ...
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... X24C44 PACKAGING INFORMATION 8-LEAD HERMETIC DUAL IN-LINE PACKAGE TYPE D SEATING PLANE 0.150 (3.81) MIN. NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 0.405 (10.29) –– PIN 1 0.300 (7.62) REF. 0.200 (5.08) 0.125 (3.18) TYP. 0.060 (1.52) 0.110 (2.79) 0.090 (2.29) 0.023 (0.58) TYP. 0.100 (2.54) 0.014 (0.36) TYP. 0.017 (0.43) 0.320 (8.13) 0.290 (7.37) TYP. 0.311 (7.90) ...
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... X24C44 PACKAGING INFORMATION 8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S PIN 1 INDEX 0.010 (0.25) 0.020 (0.50) 0 – 8 0.016 (0.410) 0.037 (0.937) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) PIN 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7 0.004 (0.19) 0.050 (1.27) 0.010 (0.25 0.0075 (0.19) 0.250" 0.010 (0.25) FOOTPRINT 14 0.150 (3.80) ...
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... A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its satety or effectiveness. X24C44 ...