M48T37Y-70MH1E STMicroelectronics, M48T37Y-70MH1E Datasheet - Page 11

• 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

Data Retention Mode
With valid V
as a conventional BYTEWIDE™ static RAM.
Should the Supply Voltage decay, the RAM will
automatically power-fail deselect, write protecting
itself when V
(min) window. All outputs become high imped-
ance, and all inputs are treated as “Don't care.”
Note: A power failure during a WRITE cycle may
corrupt data at the currently addressed location,
but does not jeopardize the rest of the RAM's con-
tent. At voltages below V
assured the memory will be in a write protected
state, provided the V
The M48T37Y/V may respond to transient noise
spikes on V
CC
CC
CC
that reach into the deselect window
applied, the M48T37Y/V operates
falls within the V
CC
fall time is not less than t
PFD
(min), the user can be
PFD
(max), V
PFD
F
.
during the time the device is sampling V
fore, decoupling of the power supply lines is rec-
ommended.
When V
switches power to the internal battery which pre-
serves data and powers the clock. The internal
button cell will maintain data in the M48T37Y/V for
an accumulated period of at least 7 years at room
temperature when V
tem power returns and V
battery is disconnected and the power supply is
switched to external V
can resume t
For more information on Battery Storage Life refer
to the Application Note AN1012.
CC
drops below V
REC
after V
CC
CC
is less than V
CC
. Normal RAM operation
CC
M48T37Y, M48T37V
SO
reaches V
rises above V
, the control circuit
PFD
SO
CC
. As sys-
(max).
. There-
SO
11/29
, the