X28C64D XICOR [Xicor Inc.], X28C64D Datasheet
X28C64D
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X28C64D Summary of contents
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... RAMs. The X28C64 supports a 64-byte page write operation, effectively providing a 78 s/byte write cycle and en- abling the entire memory to be typically written in 0.625 seconds. The X28C64 also features DATA and Toggle Bit Polling, a system software support scheme used to indicate the early completion of a write cycle ...
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... X28C64 PIN DESCRIPTIONS Addresses (A – The Address inputs select an 8-bit memory location during a read or write operation. Chip Enable (CE) The Chip Enable input must be LOW to enable all read/ write operations. When CE is HIGH, power consumption is reduced. Output Enable (OE) The Output Enable input controls the data output buffers and is used to initiate read operations ...
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... Page Write Operation The page write feature of the X28C64 allows the entire memory to be written in 0.625 seconds. Page write allows two to sixty-four bytes of data to be consecutively written to the X28C64 prior to the commencement of the internal programming cycle. The host can fetch data ...
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X28C64 DATA Polling I/O 7 Figure 2. DATA Polling Bus Sequence LAST WRITE I – Figure 3. DATA Polling Software Flow WRITE DATA WRITES COMPLETE? YES SAVE LAST DATA ...
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X28C64 The Toggle Bit I/O 6 Figure 4. Toggle Bit Bus Sequence LAST WRITE I Beginning and ending state of I/O 6 will vary. Figure 5. Toggle Bit Software Flow LAST WRITE LOAD ACCUM ...
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X28C64 HARDWARE DATA PROTECTION The X28C64 provides three hardware features (com- patible with X2864A) that protect nonvolatile data from inadvertent writes. • Noise Protection—A WE pulse typically less than 20ns will not initiate a write cycle. • Default V Sense—All ...
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X28C64 Software Data Protection Figure 6. Timing Sequence—Byte or Page Write DATA AA ADDRESS 1555 CE WE Figure 7. Write Sequence for Software Data Protection WRITE DATA AA TO ADDRESS 1555 WRITE DATA 55 TO ADDRESS 0AAA ...
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X28C64 Resetting Software Data Protection Figure 8. Reset Software Data Protection Timing Sequence V CC DATA AA 55 ADDRESS 1555 0AAA CE WE Figure 9. Software Sequence to Deactivate Software Data Protection WRITE DATA AA TO ADDRESS 1555 WRITE DATA ...
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... Because the X28C64 has two power modes, standby and active, proper decoupling of the memory array is of prime concern. Enabling CE will cause transient current spikes. The magnitude of these spikes is dependent on the output capacitive loading of the I/Os ...
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X28C64 ABSOLUTE MAXIMUM RATINGS* Temperature under Bias X28C64 ........................................ – +85 C X28C64I, X28C64M ................... – +135 C Storage Temperature ....................... – +150 C Voltage on any Pin with Respect ....................................... ...
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X28C64 ENDURANCE AND DATA RETENTION Parameter Minimum Endurance Data Retention POWER-UP TIMING Symbol (3) t Power-up to Read Operation PUR (3) t Power-up to Write Operation PUW CAPACITANCE 1MHz Symbol (3) C ...
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X28C64 A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified.) Read Cycle Limits Symbol Parameter t Read Cycle Time RC t Chip Enable Access Time CE t Address Access Time AA t Output Enable Access Time OE (4) CE LOW ...
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X28C64 WRITE CYCLE LIMITS Symbol Parameter (5) t Write Cycle Time WC t Address Setup Time AS t Address Hold Time AH t Write Setup Time CS t Write Hold Time CH CE Pulse Width HIGH Setup ...
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... Notes: (8) Between successive byte writes within a page write operation, OE can be strobed LOW: e.g. this can be done with CE and WE HIGH to fetch data from another memory device within the system for the next write; or with WE HIGH and CE LOW effectively performing a polling operation. ...
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X28C64 DATA Polling Timing Diagram (10 ADDRESS I/O 7 (10) Toggle Bit Timing Diagram OEH OE HIGH Z I Starting and ending state of I/O 6 ...
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X28C64 NOTES 16 ...
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X28C64 PACKAGING INFORMATION 28-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P PIN 1 INDEX PIN 1 SEATING PLANE 0.150 (3.81) 0.125 (3.17) 0.110 (2.79) 0.090 (2.29) TYP. 0.010 (0.25) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 1.460 (37.08) 1.400 ...
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X28C64 PACKAGING INFORMATION 28-LEAD HERMETIC DUAL IN-LINE PACKAGE TYPE D SEATING 0.200 (5.08) 0.125 (3.18) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 1.490 (37.85) 1.435 (36.45) PIN 1 1.30 (33.02) REF. PLANE 0.070 (1.78) 0.030 (0.76) 0.110 (2.79) ...
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X28C64 PACKAGING INFORMATION 32-LEAD PLASTIC LEADED CHIP CARRIER PACKAGE TYPE J 0.420 (10.67) 0.045 (1.14 0.495 (12.57) 0.485 (12.32) TYP. 0.490 (12.45) 0.453 (11.51) 0.447 (11.35) TYP. 0.450 (11.43) 0.300 (7.62) PIN 1 0.050 (1.27) TYP. 0.021 (0.53) ...
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X28C64 PACKAGING INFORMATION 28-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S 0.1040 (2.6416) 0.0940 (2.3876) 0 – 8 NOTES: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. FORMED LEAD SHALL BE PLANAR WITH RESPECT TO ONE ANOTHER ...
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X28C64 PACKAGING INFORMATION 32-PAD CERAMIC LEADLESS CHIP CARRIER PACKAGE TYPE E PIN 1 0.200 (5.08) BSC 0.028 (0.71) 0.022 (0.56) (32) PLCS. 0.458 (11.63) 0.442 (11.22) 0.458 (11.63) 0.300 (7.62) NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) ...
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X28C64 PACKAGING INFORMATION 28-LEAD CERAMIC PIN GRID ARRAY PACKAGE TYPE K TYP. 0.100 ALL LEADS PIN 1 INDEX 0.660 (16.76) 0.640 (16.26) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS ...
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X28C64 PACKAGING INFORMATION 0.740 (18.80) MAX. 0.006 (0.15) 0.003 (0.08) TYP. 0.300 2 PLCS. NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 28-LEAD CERAMIC FLAT PACK PIN 1 INDEX 1 0.440 (11.18) MAX. 0.370 (9.40) 0.250 (6.35) 0.180 (4.57) ...
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X28C64 PACKAGING INFORMATION SEE NOTE 2 8.02 (0.315) 7.98 (0.314) 1.18 (0.046) 1.02 (0.040) 0.58 (0.023) 0.42 (0.017) SOLDER PADS FOOTPRINT NOTE: 1. ALL DIMENSIONS ARE SHOWN IN MILLIMETERS (INCHES IN PARENTHESES). 32-LEAD THIN SMALL OUTLINE PACKAGE (TSOP) TYPE T ...
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X28C64 ORDERING INFORMATION Device LIMITED WARRANTY Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied description regarding the ...