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MC68HC68T1

Features: • Full Clock Features - Seconds, Minutes, (AM/PM), DayofWeek,Date, Month, Year (0 99), Auto Leap • 32Byte General Purpose RAM• Direct Interface to Motorola SPI and National MICROWIRESerial DataPorts• Minimum Timekeeping Voltage: 2.2 V• Burst Mode for Readin...

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SeekIC No. : 004416447 Detail

MC68HC68T1: Features: • Full Clock Features - Seconds, Minutes, (AM/PM), DayofWeek,Date, Month, Year (0 99), Auto Leap • 32Byte General Purpose RAM• Direct Interface to Motorola SPI and Natio...

MC68HC68T1 Data Sheet

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Part Number:
MC68HC68T1
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• Full Clock Features - Seconds, Minutes,  (AM/PM), DayofWeek,Date, Month, Year (0 99), Auto Leap  
• 32Byte General Purpose RAM
• Direct Interface to Motorola SPI and National MICROWIRE Serial DataPorts
• Minimum Timekeeping Voltage: 2.2 V
• Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
• Selectable Crystal or 50/60 Hz Line Input Frequency
• Clock Registers Utilize BCD Data•Buffered Clock Output for Driving CPU Clock, Timer, or LCDBackplane
• PowerOn Reset with First TimeUp Bit
• Freeze Circuit Eliminates Software Overhead During a Clock Read
• Three Independent Interrupt Modes - Alarm, Periodic, or PowerDown
• CPU Reset Output - Provides Orderly PowerUp/PowerDown
• Watchdog Circuit
• PinforPin Replacement for CDP68HC68T1
• Chip Complexity: 8500 FETs or 2125 Equivalent Gates
• Also See Application Notes ANE425 "Use of the MC68HC68T1 RTC with
   M6805 Microprocessor", AN457 "Providing a RealTime Clock for the
   MC68302", and AN1065 "Use of the MC68HC68T1 RealTime Clock with
   Multiple Time Bases"  


Pinout

Connection Diagram


Specifications

VCC to GND...............................................................-0.3V, +7V
PGND to GND......................................................................±2V
BST to GND..............................................................-0.3V, +15V
LX to BST...................................................................-7V, +0.3V
Inputs/Outputs to GND
    (ON, REF, SYNC, CS, FB, SS).........................-0.3V, VCC+ 0.3V
DL toPGND.......................................................-0.3V, VCC+ 0.3V
DH to LX..........................................................-0.3V, BST + 0.3V
REF Short to GND......................................................Momentary
REF Current.......................................................................20mA
Continuous Power Dissipation (TA +70°C)
   20-Pin SSOP (derate 8.00mW/°C above +70°C).......640mW
Operating Temperature Ranges:
   MAX767CAP/MAX767_CAP................................0°C to +70°C
   MAX767EAP/MAX767_EAP.............................-40°C to +85°C
Lead Temperature (soldering, 10sec)............................+300°C  


Description

The MC68HC68T1 HCMOS Clock/RAM peripheral contains a realtimeclock/calendar, a 32 x 8 static RAM, and a synchronous, serial, threewire interface for communication with a microcontroller or processor. Operating in aburst mode, successive Clock/RAM locations can be read or written using only a single starting address.

An onchip scillator allows cceptance of aselectable crystal frequency or the device can be programmed to accept a50/60 Hz line input  and system voltae (VSYS) pins give the MC68HC68T1 thecapability for sensing powerup/powerdown conditions, a capability useful for batterybackup systems. The device has an interrut output capable ofsignaling a microcontroller or processor of an alarm, periodic interrupt, or powersense condition.

An alarm can be set for comparison with the seconds, minutes,and hours registers. MC68HC68T1 can be used in conjunction with the powersupply enable (PSE) output to initiate a system powerup sequence if the VSYSpin is powered to the proper level.

 




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