DS1254YB-100 Maxim Integrated Products, DS1254YB-100 Datasheet
DS1254YB-100
Specifications of DS1254YB-100
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DS1254YB-100 Summary of contents
Page 1
... When such a condition occurs, the DS1254 makes use of an attached DS3800 battery cap to maintain clock information and preserve stored data while protecting that data by disallowing all memory accesses. Additionally, the DS1254 has dedicated circuitry for monitoring the status of an attached DS3800 battery cap. ...
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... When such a condition occurs, the DS1254 makes use of an attached DS3800 battery cap to maintain clock information and preserve stored data while protecting that data by disallowing all memory accesses. Additionally, the DS1254 has dedicated circuitry for monitoring the status of an attached DS3800 battery cap. ...
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... The preferred way to manage this requirement is to set aside just one address location in memory as a phantom clock scratch pad. When the first write cycle is executed compared to bit 0 of the 64-bit comparison register match is found, the pointer increments to the next location of the comparison register and awaits the next write cycle ...
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... The next 64 cycles will cause the phantom clock to either receive or transmit data on DQ0, depending on the level of the OE pin or the WE pin. Cycles to other locations outside the memory block can be interleaved with CE cycles without interrupting the pattern-recognition sequence or data-transfer sequence to the phantom clock. ...
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Figure 3. Phantom Clock Register Definition DS1254 ...
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AM/PM/12/24 MODE Bit 7 of the hours register is defined as the 12-hour 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 bit with logic high being PM. ...
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ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and ...
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AC ELECTRICAL CHARACTERISTICS = 3.3V 10 + PARAMETER Read Cycle Time Address Access Time OE to Output Valid CE to Output Valid Output Active Output High-Z from ...
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... CC AC TEST CONDITIONS Output Load: 100pF + 1 TTL Gate Input Pulse Levels 3.0V Timing Measurement Reference Levels: Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns Figure 4. Memory Read Cycle Timing (Note 9) ADDRESS CE OE DQ0–DQ7 C) SYMBOL MIN t BTC ...
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... Figure 5. Memory Write Cycle Timing, Write-Enable Controlled (Notes 10, 11, 12, and 13) ADDRESS CE WE DQ0–DQ7 Figure 6. Memory Write Cycle Timing, Chip-Enable Controlled (Notes 10, 11, 12, and 13) ADDRESS CE WE DQ0–DQ7 ODW OEW DH1 DATA IN STABLE ODW COE t t DH2 DS DATA IN STABLE DS1254 t AH1 ...
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Figure 7. Read Cycle to Phantom Clock DQ0 Figure 8. Write Cycle to Phantom Clock DQ0 COE ...
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Figure 9. Power-Up/Power-Down Waveform Timing (Note 14 PF(max) V PF(min) V BAT Figure 10. Battery Warning Detection (Note BAT BATTERY TEST ACTIVE ...
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NOTES: 1) Voltage referenced to ground. 2) These parameters are sampled with a 50pF load and are not 100% tested open-drain output and, as such, cannot source current. An external pullup resistor should be connected to ...
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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/packages.) PKG MIN MAX IN 1.570 1.580 A MM 39.88 40.13 IN 1.570 1.580 B MM ...
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PACKAGE INFORMATION (continued) (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/packages.) DS1254 with Attached DS3800 Battery Cap PKG MIN A IN 1.656 MM 42.06 B ...
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PACKAGE INFORMATION (continued) (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/packages.) Recommended Land Pattern (with Overlaid Package Outline) The DS1254 BGA is a subset of ...
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... AWMIN 12/09 Removed the DS1254YB ordering information and 5V operational characteristics. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...