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M48T37V

Features: ` INTEGRATED ULTRA-LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY`FREQUENCY TEST OUTPUT for REAL TIME CLOCK SOFTWARE CALIBRATION` YEAR 2000 COMPLIANT` AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION` WATCHDOG TIMER` WRITE PROTECT VOLTAGE (VPFD = Power-Fai...

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SeekIC No. : 004405377 Detail

M48T37V: Features: ` INTEGRATED ULTRA-LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY`FREQUENCY TEST OUTPUT for REAL TIME CLOCK SOFTWARE CALIBRATION` YEAR 2000 COMPLIANT` AUTOMATIC PO...

M48T37V Data Sheet

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Part Number:
M48T37V
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

` INTEGRATED ULTRA-LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY
`FREQUENCY TEST OUTPUT for REAL TIME CLOCK SOFTWARE CALIBRATION
` YEAR 2000 COMPLIANT
` AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION
` WATCHDOG TIMER
` WRITE PROTECT VOLTAGE (VPFD = Power-Fail Deselect Voltage):
    M48T37Y: 4.2VVPFD 4.5V
    M48T37V: 2.7V VPFD 3.0V
` PACKAGING INCLUDES a 44-LEAD SOIC and SNAPHAT TOP (to be Ordered Separately)
` SOIC PACKAGE PROVIDES DIRECT
   CONNECTION for a SNAPHAT[ TOP which
   CONTAINS the BATTERY and CRYSTAL
` MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode)
` PROGRAMMABLE ALARM OUTPUT ACTIVE in the BATTERY BACKED-UP
`BATTERY LOW FLAG


Pinout

Connection Diagram


Specifications

Symbol
Parameter
Value
Unit
TA
 Ambient Operating Temperature
Grade 1
0 to 70
Grade 6
40 to 85
TSTG
 Storage Temperature (VCC Off, Oscillator Off)
SNAPHAT
40 to 85
SOIC
55 to 125
TSLD(2)
 Lead Solder Temperature for 10 seconds
260
VIO
 Input or Output Voltages
M48T37Y
0.3 to 7
V
M48T37V
0.3 to 4.6
V
VCC
 Supply Voltage
M48T37Y
0.3 to 7
V
M48T37V
0.3 to 4.6
V
IO
 Output Current
10
mA
PD
 Power Dissipation
1
W


Note: 1. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage
              to  the device. This is a stress rating only and functional operation of the device at these or any 
             other  conditions above those indicated in the operational section  of this specification is not
             implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect
             reliability.

2. Soldering temperature not to exceed 260 for 10 seconds (total thermal budget not to exceed 150for
    longer  than 30 seconds).
    CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
    CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.




Description

The M48T37Y/37V TIMEKEEPER[ RAM is a 32Kb x8 non-volatile static RAM and real time clock. The monolithic chip is available in a special package which provides a highly integrated battery backed-up memory and real time clock solution.

The 44 lead 330mil SOIC M48T37Y/37V package provides sockets with gold-plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. The unique design of M48T37Y/37V allows the SNAPHAT battery package to be mounted on top of the SOIC package after the completion of the surface mount process.

Insertion of the SNAPHAT M48T37Y/37V housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface- mounting. The SNAPHAT housing is keyed to prevent reverse insertion

The SOIC M48T37Y/37V and battery packages are shipped separately in plastic anti-static tubes or in Tape &Reel form. For the 44 lead SOIC, the battery/crystal package (i.e. SNAPHAT) part number is "M4T28- BR12SH" or "M4T32-BR12SH".

Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the lithium button-cell battery.

As Figure 3 shows, the static memory array and the quartz controlled clock oscillator of the M48T37Y/37V are integrated on one silicon chip.




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