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From: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Newsgroups: sci.electronics
Subject: Re: Clock Chip Wanted.
Message-ID: <4574@mentor.cc.purdue.edu>
Date: 26 Jan 91 15:19:21 GMT
References: <1990006@hpldsla.sid.hp.com>
Reply-To: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Organization: Purdue University
Lines: 15

Geez, there are so many!  I have a Dallas Semiconductor data book that lists
16 different timekeeping devices.

Some of the distinguishing features: serial output, built in battery, NV SRAM,
watchdog circuits, alarms, EISA/ISA bus compat.

The most basic chip (DS1202) is an 8-pin DIP, counts seconds-years (day of
week) with leap year comp., 24x8 RAM, serial (3 wire) I/O, 2.0-5.5V operation,
uses <300na@2V, single/multiple-byte data transfer, optional 16-pin SOIC 
package, TTL compat., temp -40 to +85 C.  Needs 32.768 KHz crystal.

Hope that helps!

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Kyler Laird                  I'm  the NRA          lairdkb@mentor.cc.purdue.edu