Features: * 32.768kHz built-in crystal oscillator (2 ranks of 10PPM and 50PPM --- DIP) (2 ranks of 20PPM and
50PPM --- SOP)
* Real time clock of second, minute, date, month, year and day of week
* Interface corresponding to microcom- puter bus
* 30-second compensation controlled by software
* Periodical interrupt function (or periodical waveform output) for alarm
* STOP/START function for clock
* 12/24 hour selectable
* AEL input for 8048 system, 8051 system or 8085 system (when a microcomputer does not provide the ALE
output, fix the AEL input at "H".)
* Low current consumption for CMOS device
* Low STANDBY voltage and small STANDBY current
* 18-pin plastic DIP(DIP18-P-300)
* 24-pin plastic SOP Pinout
Specifications
| Parameter |
Symbol |
Conditions |
Rating |
Unit |
| Power supply voltage |
VDD |
Ta = 25° |
0.3 to 7 |
V |
| Input voltage VI |
|
-03 to VDD +0.3 |
V |
| Output voltage Vo |
|
-03 to VDD +0.3 |
V |
| Storage temperature |
TSTG |
- |
55 to +85 |
°C |
| Soldering conditions (lead) |
TSOL |
- |
Temp.:under 260°C
Time :within 10 seconds |
|
DescriptionThe MSM62X42B is a bus-connection Microcomputer peripheral IC of a Real Time Clock with built-in crystal in the perpetual calendar which can be read and written from a second unit. The interface between this IC MSM62X42B and a microcomputer uses 4 data buses, 4 address buses, 3 control buses and 2 chip selects and
carries out setting up, amending and reading time.
ALE input of MSM62X42B is available for 8048 system, 8051 system or 8085 system and is used for other microcomputers if this input is fixed at "H". The clock function provides seconds, minutes, hours, day of week, date, month, year, 12/24 hour selectable, automatic leap year in the Christian Era and 30-second compensation controlled by software. The periodical interrupt function of MSM62X42B (or periodical waveform output) and the STOP/START function of the clock are also provided. The device is a silicon gate CMOS and the current consumption is low. The built-in crystal oscillator of MSM62X42B is 32.768 kHz and battery backup operation is considered.
MSM62X42B Data Sheet
