DS1643P Maxim Integrated Products, Inc., DS1643P Datasheet
DS1643P
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DS1643P Summary of contents
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... Disconnected to Retain Freshness Until Power is Applied for the First Time § DS1643 Only (DIP Module) Standard JEDEC Byte-Wide RAM Pinout UL Recognized § DS1643P Only (PowerCap Module Board) Surface Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal Replaceable Battery (PowerCap) Power-Fail Output ...
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PIN DESCRIPTION PIN NAME PDIP PowerCap N.C. 31– A12 A10 23 29 A11 ...
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... This design allows the PowerCap to be mounted on top of the DS1643P after the completion of the surface mount process. Mounting the PowerCap after the surface mount process prevents damage to the crystal and battery due to high temperatures required for solder reflow ...
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... LSB of the seconds register will toggle at 512Hz. When the seconds register is being read, the DQ0 line will toggle at the 512Hz frequency as long as conditions for access remain valid (i.e., low, low, CE2 high, and address for seconds register remain valid and stable DS1643/ DS1643P MODE Deselect X ...
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... The DS1643 is guaranteed to keep time accuracy to within ±1 minute per month at 25°C. CLOCK ACCURACY (POWERCAP MODULE) The DS1643P and DS9034PCX are each individually tested for accuracy. Once mounted together, the module is guaranteed to keep time accuracy to within ±1.53 minutes per month (35ppm) at 25°C. ...
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DATA RETENTION MODE When V is within nominal limits (V CC read or write cycles. However, when V protection occurs) the internal clock registers and RAM are blocked from access. This is accomplished internally by inhibiting access via the be ...
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ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +7.0V Operating Temperature Range………………………………………………0°C to +70°C, Noncondensing Storage Temperature Range………………………………………………-40°C to +85°C, Noncondensing Soldering Temperature………………………………See IPC/JEDEC J-STD-020A Specification (Note 7) This is a stress rating only and functional ...
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AC CHARACTERISTICS—READ CYCLE = 5.0V ±10 0°C to +70°C PARAMETER Read Cycle Time Address Access Time and CE2 to DQ Low-Z CE Access Time CE CE2 Access Time and CE2 Data Off Time CE to ...
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AC CHARACTERISTICS—WRITE CYCLE = 5.0V ±10 0°C to +70°C PARAMETER Write Cycle Time Address Setup Time Pulse Width WE Pulse Width CE CE2 Pulse Width Data Setup Time Data Hold Time Address Hold Time Data ...
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WRITE CYCLE TIMING DIAGRAM— WE CONTROLLED WRITE CYCLE TIMING DIAGRAM— , CE2 CONTROLLED ...
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POWER-UP/DOWN AC CHARACTERISTICS = 5.0V ±10 0°C to +70°C PARAMETER CE2 Power-down V Fall Time PF(MAX) V Fall Time ...
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AC TEST CONDITIONS Output Load: 100pF + 1TTL Gate Input Pulse Levels 3.0V Timing Measurement Reference Levels: Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns NOTES: 1) Voltages are referenced to ground. 2) Typical values ...
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PACKAGE INFORMATION (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/DallasPackInfo.) DS1643 28-PIN PACKAGE PKG 28-PIN DIM MIN A IN. 1.470 MM 37.34 B IN. 0.675 ...
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... DS1643P PKG INCHES DIM MIN NOM A 0.920 0.925 B 0.980 0.985 0.052 0.055 E 0.048 0.050 F 0.015 0.020 G 0.025 0.027 NOTE: DALLAS SEMICONDUCTOR RECOMMENDS THAT POWERCAP MODULE BASES EXPERIENCE ONE PASS THROUGH SOLDER REFLOW ORIENTED WITH THE LABEL SIDE UP (“LIVE-BUG”). HAND SOLDERING AND TOUCH-UP: DO NOT TOUCH OR APPLY THE SOLDERING IRON TO LEADS FOR MORE THAN 3 SECONDS ...
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... DS1643P WITH DS9034PCX ATTACHED PKG INCHES DIM MIN NOM A 0.920 0.925 B 0.955 0.960 C 0.240 0.245 D 0.052 0.055 E 0.048 0.050 F 0.015 0.020 G 0.020 0.025 MAX 0.930 0.965 0.250 0.058 0.052 0.025 0.030 ...
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... The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. PKG DIM © 2005 Maxim Integrated Products · Printed USA DS1643/DS1643P INCHES MIN NOM MAX - 1.050 - - 0.826 - - 0 ...