DS1643-100+ Dallas Semiconductor, DS1643-100+ Datasheet
DS1643-100+
Specifications of DS1643-100+
Related parts for DS1643-100+
DS1643-100+ 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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... DESCRIPTION The DS1643 nonvolatile static RAM with a full function Real Time Clock (RTC) that are both accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any JEDEC standard SRAM. The device can also be easily substituted in ROM, EPROM and EEPROM sockets providing read/write nonvolatility and the addition of the real time clock function. The real time clock information resides in the eight uppermost RAM locations ...
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... The 8-bit of the control register is the write bit. Setting the write bit like the read bit, halts updates to the DS1643 registers. The user can then load them with the correct day, date and time data in 24 hour BCD format. Resetting the write bit then transfers those values to the actual clock counters and allows normal operation to resume ...
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... CLOCK ACCURACY (DIP MODULE) 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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... The DS1643 has a lithium power source that is designed to provide energy for clock activity, and clock and RAM data retention when the V is sufficient to power the DS1643 continuously for the life of the equipment in which it is installed. For specification purposes, the life expectancy is 10 years at 25°C with the internal clock oscillator running in the absence of V power ...
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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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... The CE2 control signal functions exactly the same as the active and inactive levels are opposite. 5) Data retention time is at 25°C. 6) Each DS1643 has a built-in switch that disconnects the lithium source until V user. The expected t is defined for DIP modules as a cumulative time in the absence from the time power is first applied by the user ...
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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 MM 17.75 C IN. 0.315 MM 8.51 D IN. 0.075 MM 1. ...
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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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... No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time 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 - - ...