Maxim DS87C530 Clock User Manual

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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock

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Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product.

No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation.

DATA SHEET REVISION SUMMARY

REVISION DESCRIPTION

070505

1) Added Pb-free/RoHS-compliant part numbers to Ordering Information table.

2) Deleted the “A” from the IPC/JEDEC J-STD-020 specification in the Absolute Maximum Ratings.

040104

3) Removed “Preliminary” status.

4) Soldering temperature parameter now references JEDEC specification.

5) Added note to absolute maximums clarifying voltages referenced to ground and storage temperature.

6) Updated I

, I

IDLE

, I

STOP

, I

SPBG

, I

, and I

to incorporate errata conditions.

7) Added note clarifying DC electrical test conditions.

8) Added note clarifying V

OH3

specification applies to first clock cycle following the transition.

9) Updated AC and MOVX electrical characteristics with final characterization values.

10) Added t

AVLL2

specification and corrected MOVX timing diagrams to show t

AVLL2

instead of t

AVLL

11) Updated I

BAT

to incorporate errata conditions.

112299 Contact factory for details.

070798

1) Added DS83C530 to data sheet.

2) Updated PMM operating current estimates.

3) Added note to clarify I

specification.

4) Added note to prevent accidental corruption of Watchdog Timer count while changing counter length.

5) Changed I

BAT

specification to 1mA over extended temperature range.

6) Changed minimum oscillator frequency to 1MHz when using external crystal.

7) Changed RST pulldown resistance from 170k

W to 200kW maximum.

8) Corrected “Data memory write with stretch” diagrams to show falling edge of ALE coincident with

rising edge of C3 clock.

022097

1) Updated ALE pin description.

2) Added note pertaining to erasure window.

3) Added note pertaining to internal MOVX SRAM.

4) Changed Note 6 from RST=5.5V to RST=V

5) Changed Note 10 from RST=5.5V to RST=V

6) Changed serial port mode 0 timing diagram label from t

QVXL

to t

QVXH

7) Added information pertaining to 52-pin TQFP package.

060895 Initial release.

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Maxim DS87C530 Clock User Manual