M48T37Y-70MH1F STMicroelectronics, M48T37Y-70MH1F Datasheet - Page 19

• Manufacturer Part Number: M48T37Y-70MH1F
• Description: IC TIMEKPR NVRAM 256KB 5V 44-SOH
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T37Y-70MH1F

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4720-2

M48T37Y, M48T37V
one volt. These negative spikes can cause data corruption in the SRAM while in battery
backup mode. To protect from these voltage spikes, it is recommended to connect a
Schottky diode from V
1N5817 is recommended for through hole and MBRS120T3 is recommended for surface
mount.
Figure 9.
Figure 10. Crystal accuracy across temperature
Figure 11. Clock calibration
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Frequency (ppm)
–100
–120
–140
–160
–20
–40
–60
–80
20
0
–40
Supply voltage protection
–30
CC
–20
to V
–10
SS
V CC
Doc ID 7019 Rev 9
(cathode connected to V
0.1µF
0
10
Temperature °C
ΔF = -0.038
F
20
T
30
V CC
V SS
0
ppm
= 25 °C
C
2
DEVICE
CC
(T - T
40
, anode to V
0
)
2
50
± 10%
60
SS
Clock operations
). Schottky diode
70
80
AI00594B
AI02169
AI00999
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