M48T37Y-70MH1E STMicroelectronics, M48T37Y-70MH1E Datasheet - Page 13

• Manufacturer Part Number: M48T37Y-70MH1E
• Description: IC TIMEKPR NVRAM 256KBIT5V 44SOH
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T37Y-70MH1E

• Memory Size: 256K (32K 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: Surface Mount
• Package / Case: 44-SOH
• Bus Type: Parallel
• User Ram: 32KB
• Operating Supply Voltage (typ): 5V
• Package Type: SOH
• 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: 44
• Mounting: Surface Mount
• Memory Configuration: 32K X 8
• Nvram Features: RTC
• Interface Type: Parallel
• Access Time: 70ns
• Supply Voltage Range: 4.5V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 44
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2854-5; M48T37Y-70MH1

M48T37Y, M48T37V
Table 5.
Keys:
Address
7FFEh
7FFDh
7FFCh
7FFBh
7FFFh
7FFAh
7FF9h
7FF8h
7FF7h
7FF6h
7FF5h
7FF4h
7FF3h
7FF2h
7FF1h
7FF0h
S = Sign bit
FT = Frequency test bit
R = READ bit
W = WRITE bit
ST = Stop bit
0 = Must be set to '0'
BL = Battery low flag (read only)
BMB0-BMB4 = Watchdog multiplier bits
AFE = Alarm flag enable flag
RB0-RB1 = Watchdog resolution bits
WDS = Watchdog steering bit
ABE = Alarm in battery backup mode enable bit
RPT1-RPT4 = Alarm repeat mode bits
WDF = Watchdog flag (read only)
AF = Alarm flag (read only)
Z = '0' and are read only
RPT4
RPT3
RPT2
RPT1
WDS
WDF
AFE
Register map
D7
ST
W
0
0
0
0
0
BMB4 BMB3
D6
AF
FT
R
0
0
0
0
0
0
Alarm 10 seconds
1000 year
Alarm 10 minutes
10 years
10 seconds
10 minutes
AIarm 10 hours
AIarm 10 date
ABE
D5
S
0
0
Z
10 hours
10 date
Doc ID 7019 Rev 9
BMB2 BMB1 BMB0
10 M
D4
BL
0
0
Data
D3
Z
0
0
Date: Day of month
Calibration
Alarm seconds
Alarm minutes
Alarm hours
D2
Alarm date
Z
0
Seconds
100 year
Minutes
Month
Hours
Day of week
Year
RB1
D1
Z
0
RB0
D0
Z
0
Alarm hour
Alarm date
Watchdog
Alarm min
Alarm sec
Interrupts
Century
Control
Month
Hours
Clock operations
Function/range
Flags
Date
Year
Day
Sec
Min
BCD format
00-99
01-12
01-31
00-23
00-59
00-59
01-31
00-23
00-59
00-59
00-99
01-7
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