Quick Detail:

Microprocessor-Compatible, Real-Time Clock

Description:

The ICM7170 real time clock is a microprocessor bus

compatible peripheral, fabricated using Intersil’s silicon gate

CMOS LSl process. An 8-bit bidirectional bus is used for the

data I/O circuitry. The clock is set or read by accessing the 8

internal separately addressable and programmable counters

from 1/100 seconds to years. The counters are controlled by

a pulse train divided down from a crystal oscillator circuit, and the frequency of the crystal is selectable with the onchip command register. An extremely stable oscillator frequency is achieved through the use of an on-chip regulated power supply.

The device access time (tACC) of 300ns eliminates the need for wait states or software overhead with most microprocessors. Furthermore, an ALE (Address Latch Enable) input is provided for interfacing to microprocessors with a multiplexed address/data bus. With these two special features, the ICM7170 can be easily interfaced to any

available microprocessor.

The ICM7170 generates two types of interrupts, periodic and alarm. The periodic interrupt (100Hz, 10Hz, etc.) can be programmed by the internal interrupt control register to provide 6 different output signals. The alarm interrupt is set by loading an on-chip 51-bit RAM that activates an interrupt output through a comparator. The alarm interrupt occurs when the real time counter and alarm RAM time are equal. A status register is available to indicate the interrupt source.

An on-chip Power Down Detector eliminates the need for external components to support the battery back-up function. When a power down or power failure occurs, internal logic switches the on-chip counters to battery backup operation. Read/write functions become disabled and operation is limited to time-keeping and interrupt generation, resulting in low power consumption.

Internal latches prevent clock roll-over during a read cycle. Counter data is latched on the chip by reading the 100th-seconds counter and is held indefinitely until the counter is read again, assuring a stable and reliable time value.

Applications:

• 8-Bit, µP Bus Compatible

- Multiplexed or Direct Addressing

• Regulated Oscillator Supply Ensures Frequency

Stability and Low Power

• Time From 1/100 Seconds to 99 Years

• Software Selectable 12/24 Hour Format

• Latched Time Data Ensures No Roll Over During Read

• Full Calendar with Automatic Leap Year Correction

• On-Chip Battery Backup Switchover Circuit

• Access Time Less than 300ns

• 4 Programmable Crystal Oscillator Frequencies Over

Industrial Temperature Range

• 3 Programmable Crystal Oscillator Frequencies Over

Military Temperature Range

• On-Chip Alarm Comparator and RAM

• Interrupts from Alarm and 6 Selectable Periodic Intervals

• Standby Micro-Power Operation: 1.2µA Typical at 3.0V and 32kHz Crystal

Specifications:

Competitive Advantage:

Warranty :180 days !
Free shipping: Order over $1000 win a free shipment fee
(goods weight below 3Kg) ,during 20130901-20130930 .

Why buy from us >>> Fast / Safely / Conveniently

• Mega Source is a Stock keeper and trade company of Electronic components .Our branches office include China, Hong Kong, Sigapore , Canada . Offer business, service, resourcing and information for our global member.
• Goods are ensured the highest quality possible and are delivered to our customers all over the world with speed and precision.

How to buy >>>

• Contact us by email & sent your inquire with your Transport destination .
• Online chat, the commissioner would be responded ASAP.

Service >>>

• Forwarder Shipment to world-wide, DHL ,TNT ,UPS,FEDEX etc. buyer don`t need to worry about shipping problem
• We will try to respond as quickly as possible. But due to time zone difference, please allow up to 24 hours to get your mail replied. The products were tested by some devices or software, we ensure that there is no quality problems.
• We are committed to providing fast, convenient and safe transportation service to global buyer.