AT8564
Part Number Description Working temperature range (℃) Trickle charge Alarm / Interrupt Square wave output (Hz) Clock calibration function Power down Oscillation stop detection User RAM (bytes) Bckup power Cross Reference Power supply voltage (V) Timing current (typical) Clock format Crystal CL (pF) Integrated crystal Temperature compensation Pin/Package
AT8564 -40 to +85 1﹣A 32K (push-pull) programmable (open drain) PCF8564 1.0~5.5 0.60μA (3V) HH:MM:SS 12.5 bare die

Description

      AT8564A is a CMOS real-time clock/calendar chip optimized for low power consumption. The timing counter consists of century, year, month, day, date, hour, minute and second bits. External MPU can read or set the time as well as timer or alarmer when it is necessary. As exchanging data by the advance serial bus I2C, lines number on PCB can be reduced dramatically, which is very suitable in a complicated system.

Features

  •     An external 32.768 kHz crystal is needed to generated time base

  •     Wide operating supply voltage range: 1.0 to 5.5 V

  •     Low back-up current; typical 0.25 µA at VDD = 3.0 V and Tamb = 25 °C

  •     400 kHz two-wire I2C-bus interface (at VDD = 1.8 to 5.5 V)

  •     Programmable clock output for peripheral devices: 32.768 kHz, 1024Hz ,32Hz and1Hz

  •     Alarm and timer functions

  •     Voltage-low detector

  •     Integrated oscillator capacitor

  •     Internal power-on reset

  •     I2C-bus slave address: read A3H; write A2H

Applications

  •     Timing devices

    Time of the day tracking

    Process timing

    Alarm

  •     Portable instruments

  •     OA equipments such as Fax machines

  •     Battery powered products

    Pin layout

Pin description

Symbol

Pin

Description

OSCI

1

oscillator input

OSCO

2

oscillator output

INT

3

interrupt output (open-drain; active LOW)

VSS

4

ground

SDA

5

serial Data I/O (open-drain)

SCL

6

serial Clock in

CLKOUT

7

clock output, push-pull

VDD

8

positive power supply

CLKOE

9

CLKOUT enable input




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