DALLAS DS12887A+ DIP-24 Real-Time Clock Chip RAM 128 PROGRAMMABLE

DALLAS DS12887A+ DIP-24 Real-Time Clock Chip RAM 128 PROGRAMMABLE TIMER Up for sale is one Piece DS12887A+ is supposed to be able to be used in place of DS12887, DS12887+ & DS12887A, DS12887A has an extra pin, #21 that is present but not used much, make sure you need pin 21 in your system. The "+" at the end means it is lead free. General Description:
The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287. The devices provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of batterybacked static RAM (113 bytes in the DS12C887 and DS12C887A). The DS12887 integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS12C887 adds a century byte at address 32h. For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The devices also operate in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. A lithium coin-cell battery can be connected to the VBAT input pin on the DS12885 to maintain time and date operation when primary power is absent. The device is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes. Condition: New It is your responsibility to make sure the part number listed is the one you need, and also if you need tracking it is your responsibility to select that before paying for this item. This is used in older computers in place of the BIOS version of date & time feature. It holds the info in the chip & has an internal battery to make sure it doesn't get lost. Here is some info for those that are trying to install these for the first time and have issues: Normally the chip should turn the oscillator on when first powered on. Since the DS12887 is a new part, you may need to start the oscillator... When the DS12887, DS12887A, DS12C887, and DS12C887A are shipped from the factory, the internal oscillator is turned off. This prevents the lithium energy cell from being used until the device is installed in a system. A pattern of 010 in bits 4 to 6 of Register A turns the oscillator on and enables the countdown chain. A pattern of 11x (DV2 = 1, DV1 = 1, DV0 = X) turns the oscillator on, but holds the countdown chain of the oscillator in reset. All other combinations of bits 4 to 6 keep the oscillator off. ABOUT US: We are a computer sales and services firm, providing service contracts to our local customers, building custom computers, upgrading computers, and also sell new and used parts. The used parts we list in our listings, are from recycled computers, laptops, printers, or other electronic devices. As our customers upgrade their systems and equipment, they trade in their replaced equipment, since they won't be using it and it takes up excess space in the home or office. We take them apart and try to help out others looking for hard to find parts. We also give back to help autism with some of the funds we make from these sales. STORE HOURS: Monday – Friday 9am – 5pm Eastern Time. Any questions / problems / concerns you may have will be answered during the store hours. PAYMENT: Pricetronic will let you know about our payment methods. Shipment will only be sent to PayPal confirmed shipping address. Payments must be made within 3 days of close of auction. All Buy It Now items must be paid right away. Check the shipping details for different ways the item can be sent. SHIPPING TERMS: We must ship to your PayPal confirmed shipping address. We ship the majority of our items through USPS which is usually a 2-7 day service. Larger items by UPS or FEDEX, at our discretion. If you purchased an item with tracking, a tracking number will be added to your order details when your item ships. Please make arrangements for its acceptance or secure storage upon delivery. We are not liable for any merchandise lost or stolen after delivery has been recorded by the shipping carrier. We will require a signature upon delivery for orders over $250.00. Contact us immediately if your parcel shows any sign of damage upon receipt. If you need special shipping make sure to check out the shipping details section. Also remember once the carrier has the package we have no control on how long it takes to arrive at your location. Some items are flat and might be shipped in a regular white envelope, make sure you didn't put it in the bills pile or that other people in the home did the same, believe it or not it does happen, have had several buyers waiting an extra 2 weeks and then found out the significant other put it in the bill pile. RETURNS: Buyer should contact us within 14 days. Refund given as Money Back. Buyer pays return shipping. FEEDBACK: After the completion of the transaction please leave positive feedback. We strive for excellent customer service. 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