DS1243Y Maxim Integrated Products, DS1243Y Datasheet
DS1243Y
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DS1243Y Summary of contents
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... DS1243Y-150 0°C to +70°C DS1243Y-120+ 0°C to +70°C + Denotes a lead-free/RoHS-compliant device. 64k NV SRAM with Phantom Clock PIN CONFIGURATION TOP VIEW GND PIN-PACKAGE TOP MARK 28 EMOD (0.720a) DS1243Y 28 EMOD (0.720a) DS1243Y-120 28 EMOD (0.720a) DS1243Y-150 28 EMOD (0.720a) DS1243Y-120 DS1243Y RST A12 2 DS1243Y ...
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... DESCRIPTION The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192 words by 8 bits) with a built-in real time clock. The DS1243Y has a self-contained lithium energy source and control circuitry, which constantly monitors V condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent corrupted data in both the memory and real time clock ...
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... RAM and disconnects the lithium energy source. Normal RAM operation can resume CC after V exceeds 4.5V. CC See “Conditions of Acceptability” at FRESHNESS SEAL Each DS1243Y is shipped from Dallas Semiconductor with its lithium energy source disconnected, insuring full energy capacity. When V source is enabled for battery backup operation. (Write Enable) is inactive (high) and WE and OE ...
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PHANTOM CLOCK OPERATION Communication with the Phantom Clock is established by pattern recognition on a serial bit stream of 64 bits which must be matched by executing 64 consecutive write cycles containing the proper data on DQ0. All accesses which ...
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PHANTOM CLOCK REGISTER DEFINITION Figure 1 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 ...
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PHANTOM CLOCK REGISTER DEFINITION Figure 2 AM-PM/12/24 MODE Bit 7 of the hours register is defined as the 12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM ...
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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 +70°C (noncondensing) Soldering Temperature…………………………………………………….260°C for 10 seconds (Note 13) This is a stress rating only and functional ...
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... Timing Measurement Reference Levels Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns DS1243Y-120 DS1243Y-150 MIN MAX MIN MAX 120 150 120 150 60 70 120 150 120 150 90 100 DS1243Y UNITS NOTES MIN MAX 200 ns 200 ns 100 ns 200 100 200 ns 150 ...
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PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS (V = 4.5V to 5.5V 0°C to +70°C PARAMETER Read Cycle Time Access Time CE Access Time OE to Output Low Output Low Output High ...
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MEMORY READ CYCLE (NOTE 1) MEMORY WRITE CYCLE 1 (NOTES 2, 6, AND ...
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MEMORY WRITE CYCLE 2 (NOTES 2 AND 8) RESET FOR PHANTOM CLOCK READ CYCLE TO PHANTOM CLOCK ...
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WRITE CYCLE TO PHANTOM CLOCK POWER-DOWN/POWER-UP CONDITION ...
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... IH and . t is measured from the latter going high going high © 2005 Maxim Integrated Products · Printed USA CE low transition in Write WE high transition, the output WE low transition, CE with the clock oscillator G56-G0002-001 DS1243Y or WE ...