M48T37Y-70MH1E STMicroelectronics, M48T37Y-70MH1E Datasheet - Page 4

• 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
SUMMARY DESCRIPTION
The M48T37Y/V TIMEKEEPER
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 package provides sock-
ets with gold-plated contacts at both ends for di-
rect connection to a separate SNAPHAT housing
containing the battery and crystal. The unique de-
sign allows the SNAPHAT
age to be mounted on top of the SOIC package
after the completion of the surface mount process.
Insertion of the SNAPHAT housing after reflow
prevents potential battery and crystal damage due
Figure 2. Logic Diagram
4/29
A0-A14
WDI
W
G
E
15
V CC
V SS
M48T37Y
M48T37V
®
battery/crystal pack-
®
RAM is a 32 Kb
8
DQ0-DQ7
RST
IRQ/FT
AI02172
to the high temperatures required for device sur-
face-mounting. The SNAPHAT housing is keyed
to prevent reverse insertion.
The SOIC and battery packages are shipped sep-
arately in plastic anti-static tubes or in Tape &Reel
form. For the 44-lead SOIC, the battery/crystal
package (e.g., SNAPHAT) part number is “M4T28-
BR12SH”
18., page
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
Table 1. Signal Names
A0-A14
DQ0-DQ7
RST
IRQ/FT
WDI
E
G
W
V
V
NC
CC
SS
27).
or
Address Inputs
Data Inputs / Outputs
Reset Output (Open Drain)
Interrupt / Frequency Test Output
(Open Drain)
Watchdog Input
Chip Enable
Output Enable
WRITE Enable
Supply Voltage
Ground
Not connected Internally
“M4T32-BR12SH”
(see
Table