M48T58-70PC1 STMicroelectronics, M48T58-70PC1 Datasheet - Page 19
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M48T58-70PC1
Manufacturer Part Number
M48T58-70PC1
Description
IC TIMEKPR NVRAM 64KBIT 5V 28-DI
Manufacturer
STMicroelectronics
Series
Timekeeper®r
Type
Clock/Calendar/NVSRAMr
Datasheet
1.M48T58-70PC1.pdf
(33 pages)
Specifications of M48T58-70PC1
Memory Size
64K (8K x 8)
Time Format
HH:MM:SS (24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.75 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
28-DIP Module (600 mil), 28-EDIP
Function
Clock/Calendar/NV Timekeeping RAM/Battery Backup
Rtc Memory Size
8192 Byte
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.75 V
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Rtc Bus Interface
Parallel
Clock Format
HH
Clock Ic Type
Timekeeper
Memory Configuration
8K X 8
Supply Voltage Range
4.75V To 5.5V
Digital Ic Case Style
DIP
No. Of Pins
28
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-2857-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M48T58-70PC1
Manufacturer:
NS
Quantity:
290
Company:
Part Number:
M48T58-70PC1
Manufacturer:
XILINX
Quantity:
86
Part Number:
M48T58-70PC1
Manufacturer:
ST
Quantity:
20 000
M48T58, M48T58Y
6.5
Note:
Note:
6.6
Note:
Battery low flag
The M48T58/Y automatically performs periodic battery voltage monitoring upon power-up.
The battery low flag (BL), bit D6 of the flags register 1FFDh, will be asserted high if the
internal or SNAPHAT
low enable (BLE) bit has been previously set to '1.' The BL flag will remain active until
completion of battery replacement and subsequent battery low monitoring tests.
If a battery low is generated during a power-up sequence, this indicates that the battery
voltage is below 2.5 V (approximately), which may be insufficient to maintain data integrity.
Data should be considered suspect and verified as correct. A fresh battery should be
installed.
The SNAPHAT top may be replaced while V
This will cause the clock to lose time during the interval the SNAPHAT
disconnected.
Battery monitoring is a useful technique only when performed periodically. The M48T58/Y
only monitors the battery when a nominal V
which require extensive durations in the battery back-up mode should be powered-up
periodically (at least once every few months) in order for this technique to be beneficial.
Additionally, if a battery low is indicated, data integrity should be verified upon power-up via
a checksum or other technique.
Century bit
Bit D5 and D4 of clock register 1FFCh contain the CENTURY ENABLE bit (CEB) and the
CENTURY bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or
from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,'
CB will not toggle.
The WRITE bit must be set in order to write to the CENTURY bit.
®
battery is found to be less than approximately 2.5 V and the battery
Doc ID 2412 Rev 7
CC
CC
is applied to the device. Thus applications
is applied to the device.
®
battery/crystal top is
Clock operations
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