PDF DS1248P Data sheet ( Hoja de datos )

Número de pieza	DS1248P
Descripción	1024k NV SRAM with Phantom Clock
Fabricantes	Dallas Semiconducotr
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Hay una vista previa y un enlace de descarga de DS1248P (archivo pdf) en la parte inferior de esta página. Total 21 Páginas
No Preview Available ! DS1248/DS1248P 1024k NV SRAM with Phantom Clock www.maxim-ic.com FEATURES § Real-time clock (RTC) keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years § 128k x 8 NV SRAM directly replaces volatile static RAM or EEPROM § Embedded lithium energy cell maintains calendar operation and retains RAM data § Watch function is transparent to RAM operation § Month and year determine the number of days in each month; valid up to 2100 § Full 10% operating range § Operating temperature range: 0°C to +70°C § Over 10 years of data retention in the absence of power § Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time § DIP Module only § Standard 32-pin JEDEC pinout § PowerCap® Module Board only - Surface mountable package for direct connection to PowerCap containing battery and crystal - Replaceable battery (PowerCap) - Pin for pin compatible with DS1244P and DS1251P PIN ASSIGNMENT RST A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 VCC 31 A15 30 NC 29 WE 28 A13 27 A8 26 A9 25 A11 24 OE 23 A10 22 CE 21 DQ7 20 DQ6 19 DQ5 18 DQ4 17 DQ3 32-Pin Encapsulated Package 740mil Flush RST A15 A16 NC VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 1 34 2 33 3 32 4 31 5 30 6 29 7 28 8 27 9 26 10 25 11 24 12 23 13 22 14 21 15 16 X1 GND VBAT X2 20 19 17 18 34-Pin PowerCap Module Board (Uses DS9034PCX PowerCap) NC NC A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 PowerCap is a registered trademark of Dallas Semiconductor. 1 of 21 112801 1 page PHANTOM CLOCK REGISTER DEFINITION Figure 1 DS1248/DS1248P Note: The pattern recognition in Hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being accidentally duplicated and causing inadvertent entry to the phantom clock is less than 1 in 1019. This pattern is sent to the phantom clock LSB to MSB. 5 of 21 5 Page DS1248/DS1248P MEMORY AC ELECTRICAL CHARACTERISTICS Over the operating range (3.3V) PARAMETER SYMBOL DS1248W-120 MIN MAX UNITS NOTES Read Cycle Time Access Time OE to Output Valid tRC 120 ns tACC 120 ns tOE 60 ns CE to Output Valid tCO 120 ns OE or CE to Output Active tCOE 5 ns 5 Output High-Z from Deselection tOD 40 ns 5 Output Hold from Address Change tOH 5 ns Write Cycle Time tWC 120 ns Write Pulse Width tWP 90 ns 3 Address Setup Time tAW 0 ns Write Recovery Time tWR 20 ns 10 Output High-Z from WE tODW 40 ns 5 Output Active from WE tOEW 5 ns 5 Data Setup Time Data Hold Time from WE tDS 50 tDH 20 ns 4 ns 4 PHANTOM CLOCK AC ELECTRICALCHARACTERISTICS Over the operating range (3.3V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Read Cycle Time CE Access Time tRC 120 tCO ns 100 ns OE Access Time tOE 100 ns CE to Output Low-Z tCOE 5 ns OE to Output Low-Z tOEE 5 ns CE to Output High-Z tOD 40 ns 5 OE to Output High-Z tODO 40 ns 5 Read Recovery Write Cycle Time Write Pulse Width Write Recovery Data Setup Time Data Hold Time CE Pulse Width tRR 20 tWC 120 tWP 100 tWR 20 tDS 45 tDH 0 tCW 105 ns ns ns 3 ns 10 ns 4 ns 4 ns RESET Pulse Width tRST 120 ns 11 of 21 11 Page

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