PDF DS1251P Data sheet ( Hoja de datos )

Número de pieza	DS1251P
Descripción	4096k NV SRAM with Phantom Clock
Fabricantes	Dallas Semiconducotr
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No Preview Available ! www.DataSheet4U.com DS1251/DS1251P 4096k NV SRAM with Phantom Clock www.maxim-ic.com FEATURES PIN ASSIGNMENT § Real-time clock keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years § 512k x 8 NV SRAM directly replaces volatile static RAM or EEPROM § Embedded lithium energy cell maintains A18/RST A16 A14 A12 A7 A6 A5 1 2 3 4 5 6 7 32 VCC 31 A15 30 A17 29 WE 28 A13 27 A8 26 A9 calendar operation and retains RAM data § Watch function is transparent to RAM operation § Month and year determine the number of A4 8 A3 9 A2 10 A1 11 A0 12 25 A11 24 OE 23 A10 22 CE 21 DQ7 days in each month; valid up to 2100 DQ0 13 20 DQ6 § Over 10 years of data retention in the absence of power § Full 10% operating range DQ1 DQ2 GND 14 15 16 19 DQ5 18 DQ4 17 DQ3 § Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time DataSheet4U.com 32-Pin Encapsulated Package 740mil Flush § DIP Module only – Standard 32-pin JEDEC pinout – Upward comparable with the DS1248 § PowerCap® Module Board only – Surface mountable package for direct connection to PowerCap containing battery and crystal – Replaceable battery (PowerCap) – Pin for pin compatible with other densities of DS124XP phantom clocks RST A15 A16 NC VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 X1 GND VBAT X2 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 34-Pin PowerCap Module Board (Uses DS9034PCX PowerCap) A18 A17 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 DataShee PowerCap is a registered trademark of Dallas Semiconductor. DataSheet4U.com DataSheet4 U .com 1 of 22 112801 1 page www.DataSheet4U.com PHANTOM CLOCK REGISTER DEFINITION Figure 1 DS1251/DS1251P et4U.com DataSheet4U.com DataShee 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. DataSheet4U.com DataSheet4 U .com 5 of 22 5 Page www.DataSheet4U.com DS1251/DS1251P PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS Over the operating range (5V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Read Cycle Time tRC 65 ns CE Access Time tCO 55 ns OE Access Time tOE 55 ns CE to Output Low-Z tCOE 5 ns OE to Output Low-Z tOEE 5 ns CE to Output High-Z tOD 25 ns 5 OE to Output High-Z tODO 25 ns 5 Read Recovery Write Cycle Time Write Pulse Width Write Recovery Data Setup Time Data Hold Time tRR 10 tWC 65 tWP 55 tWR 10 tDS 30 tDH 0 ns ns ns 3 ns 10 ns 4 ns 4 CE Pulse Width tCW 60 ns RESET Pulse Width tRST 65 ns POWER-DOWN/POWER-UP TIMING Over the operating range (3.3V) et4U.com PARAMETER SYMBOL MIN TYP MAX UNITS NOTES CE at VIH before Power-Down VCC Slew from VPF(max) to DatPtaDSheet4U.c0om tF 300 ms ms VPF(min)( CE at VPF) VCC Slew from VPF(min) to VSO tFB 10 ms VCC Slew from VPF(max) to VPF(min)( CE at VPF) CE at VIH after Power-Up tR 0 tREC 1.5 ms 2.5 ms DataShee PARAMETER Expected Data Retention Time SYMBOL MIN TYP tDR 10 MAX (TA = +25°C) UNITS NOTES years 9 Warning: Under no circumstances are negative undershoots of any amplitude allowed when device is in battery-backup mode. DataSheet4U.com DataSheet4 U .com 11 of 22 11 Page

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Número de pieza	Descripción	Fabricantes
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