M48T512Y-70PM1 STMicroelectronics, M48T512Y-70PM1 Datasheet - Page 7

• Manufacturer Part Number: M48T512Y-70PM1
• Description: IC TIMEKPR NVRAM 4MBIT 5V 32-DIP
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T512Y-70PM1

• Memory Size: 4M (512K x 8)
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 32-DIP (600 mil) Module
• Clock Format: BCD
• Clock Ic Type: Timekeeper
• Memory Configuration: 512K X 8
• Supply Voltage Range: 4.5V To 5.5V
• Digital Ic Case Style: DIP
• No. Of Pins: 32
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes
• Nvram Features: RTC, Internal Battery, XTAL
• Access Time: 70ns
• Memory Case Style: DIP
• Bus Type: Parallel
• User Ram: 512KB
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 32
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2856-5

Table 9. Read Mode AC Characteristics
(T
Note: 1. C
Figure 6. Address Controlled, Read Mode AC Waveforms
Setting the Clock. Bit D7 of the Control Register
(7FFF8h) is the WRITE bit. Setting the WRITE bit
to a '1', like the READ bit, halts updates to the
TIMEKEEPER registers. The user can then load
them with the correct day, date, and time data in
24 hour BCD format (see Table 11). Resetting the
WRITE bit to a '0' then transfers the values of all
time registers 7FFFFh-7FFF9h to the actual TIME-
KEEPER counters and allows normal operation to
resume. After the WRITE bit is reset, the next
clock update will occur approximately one second
later. See Application Note, AN923, (TIMEKEEP-
ERS "ROLLING INTO" THE 21ST CENTURY) on
the ST Web Site for more information on Century
Rollover.
A
t
t
t
t
t
t
t
t
Symbol
GHQZ
AVQV
ELQV
GLQV
ELQX
GLQX
EHQZ
AXQX
t
= 0 to 70 °C)
AVAV
2. C
(1)
(2)
(1)
(1)
(2)
(2)
(2)
(1)
L
L
= 100pF.
= 5pF.
A0-A16
DQ0-DQ7
Read Cycle Time
Address Valid to Output Valid
Chip Enable Low to Output Valid
Output Enable Low to Output Valid
Chip Enable Low to Output Transition
Output Enable Low to Output Transition
Chip Enable High to Output Hi-Z
Output Enable High to Output Hi-Z
Address Transition to Output Transition
DATA VALID
Parameter
tAXQX
tAVQV
tAVAV
VALID
Note: Upon power-up, both the WRITE bit and the
READ bit will be reset to '0'.
Stopping and Starting the Oscillator. The os-
cillator may be stopped at any time. If the device is
going to spend a significant amount of time on the
shelf, the oscillator can be turned off to minimize
current drain on the battery. The STOP bit is locat-
ed at Bit D7 within 7FFF9h. Setting it to a '1' stops
the oscillator. The M48T512Y/V is shipped from
STMicroelectronics with the STOP bit set to a '1'.
When reset to a '0', the M48T512Y/V oscillator
starts after approximately one second.
Note: It is not necessary to set the WRITE bit
when setting or resetting the FREQUENCY TEST
bit (FT) or the STOP bit (ST).
Min
70
10
5
5
M48T512Y
-70
Max
70
70
40
25
25
DATA VALID
M48T512Y, M48T512V
Min
85
5
5
5
M48T512V
-85
AI02324
Max
85
85
55
30
30
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
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