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DS1747-70IND Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1747-70IND Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 18 page DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs 2 of 18 PIN DESCRIPTION A0–A18 – Address Input CE – Chip Enable OE – Output Enable WE – Write Enable VCC – Power-Supply Input GND – Ground DQ0–DQ7 – Data Input/Output N.C. – No Connection RST – Power-On Reset Output (PowerCap Module board only) X1, X2 – Crystal Connection VBAT – Battery Connection ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE TOP MARK DS1747-70 0°C to +70°C 32 EDIP (0.740a) DS1747-70 DS1747-70IND -40°C to +85°C 32 EDIP (0.740a) DS1747-70 IND DS1747P-70 0°C to +70°C 34 PowerCap DS1747P-70 DS1747P-70IND -40°C to +85°C 34 PowerCap DS1747P-70 IND DS1747W-120 0°C to +70°C 32 EDIP (0.740a) DS1747W-120 DS1747W-120IND -40°C to +85°C 32 EDIP (0.740a) DS1747W-120 IND DS1747WP-120 0°C to +70°C 34 PowerCap DS1747WP-120 DS1747WP-120IND -40°C to +85°C 34 PowerCap DS1747WP-120 IND DESCRIPTION The DS1747 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 512k x 8 nonvolatile static RAM. User access to all registers within the DS1747 is accomplished with a byte-wide interface as shown in Figure 1. The RTC information and control bits reside in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the date of each month and leap year are made automatically. The RTC clock registers are double buffered to avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also prevents time loss as the timekeeping countdown continues unabated by access to time register data. The DS1747 also contains its own power-fail circuitry that deselects the device when the VCC supply is in an out-of-tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided. |
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