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DS12R885S-33 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS12R885S-33 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 23 page RTC with Constant-Voltage Trickle Charger _____________________________________________________________________ 9 POWER CONTROL AND TRICKLE CHARGER VBACKUP OSC BUS INTERFACE VCC X1 X2 DS12R887/ DS12CR887 ONLY DS12R887/ DS12CR887 ONLY RESET CS DS AS R/W MOT AD0–AD7 DIVIDE BY 8 DIVIDE BY 64 DIVIDE BY 64 16:1 MUX SQUARE- WAVE GENERATOR REGISTERS A, B, C, D CLOCK/CALENDAR AND ALARM REGISTERS USER RAM 114 BYTES CLOCK/CALENDAR UPDATE LOGIC IRQ SQW IRQ GENERATOR BUFFERED CLOCK/ CALENDAR AND ALARM REGISTERS GND RLCR DS12R885 Functional Diagram Pin Description PIN SO EDIP BGA NAME FUNCTION 1 1 C5 MOT Motorola or Intel Bus Timing Selector. This pin selects one of two bus types. When connected to VCC, Motorola bus timing is selected. When connected to GND or left disconnected, Intel bus timing is selected. The pin has an internal pulldown resistor. 2— — X1 3— — X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a 12.5pF specified load capacitance (CL). Pin X1 is the input to the oscillator and can optionally be connected to an external 32.768kHz oscillator. The output of the internal oscillator, pin X2, is floated if an external oscillator is connected to pin X1. 4–11 4–11 F4, D4, F3, D3, F2, D2, F1, D1 AD0– AD7 Multiplexed, Bidirectional Address/Data Bus. The addresses are presented during the first portion of the bus cycle and latched into the DS12R885 by the falling edge of AS. Write data is latched by the falling edge of DS (Motorola timing) or the rising edge of R/W (Intel timing). In a read cycle, the DS12R885 outputs data during the latter portion of DS (DS and R/W high for Motorola timing, DS low and R/W high for Intel timing). The read cycle is terminated and the bus returns to a high-impedance state as DS transitions low in the case of Motorola timing or as DS transitions high in the case of Intel timing. |
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Similar Description - DS12R885S-33 |
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