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MFG:MOT Package Cooled:SOP
Part Number: MC68HC68T1
MFG: MOT
Package Cooled: SOP
Description: The MC68HC68T1 HCMOS Clock/RAM peripheral contains a realtimeclock/calendar,a 32x 8 static...
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MC68HC68T1
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DataSheet
General Description
MC68HC68T1 General 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. This alarm 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.
MC68HC68T1 Maximum Ratings
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
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
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 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"
• 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"
MC68HC68T1 Connection Diagram
MC68HC68T1
PDF/DataSheet Download
- Datasheet: MC68HC68T1
- File Size: 350656 KB
- Manufacturer: MOTOROLA [Motorola, Inc]
- Click here to Download
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