M48T37Y-70MH1E STMicroelectronics, M48T37Y-70MH1E Datasheet - Page 23

• 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

Figure 14. Power Down/Up Mode AC Waveforms
Table 12. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
Table 13. Power Down/Up Trip Points DC Characteristics
Note: All voltages referenced to V
Symbol
t
V
V
DR
Symbol
PFD
t
SO
REC
t
2. V
3. V
4. t
1. Valid for Ambient Operating Temperature: T
2. Using larger M4T32-BR12SH6 SNAPHAT top (recommended for Industrial Temperature Range - Grade 6 device).
3. At 25°C, V
t
(3)
FB
t
F
t
RB
(2)
R
es V
(3)
REC
(4)
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
RST
INPUTS
OUTPUTS
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
PFD
(min) = 20ms for Industrial Temperature Range - Grade 6 device.
(max) to V
(min) to V
(min).
V
V
V
V
V
CC
PFD
PFD
PFD
SS
PFD
= 0V.
SS
to V
PFD
(min) to V
(max) to V
(min) to V
(max) to RST High
fall time of less than t
(min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after V
PFD
VALID
VALID
SS
(min) V
.
PFD
SS
PFD
tF
Parameter
V
(max) V
Parameter
CC
CC
(min) V
Fall Time
Rise Time
FB
CC
CC
may cause corruption of RAM data.
(1)
A
A
tFB
= 0 to 70°C or –40 to 85°C; V
= 0 to 70°C or –40 to 85°C; V
(1)
Rise Time
Fall Time
M48T37Y
M48T37V
M48T37Y
M48T37V
Grade 1
Grade 6
DON'T CARE
tDR
HIGH-Z
CC
CC
10
Min
4.2
2.7
5
= 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
= 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
(2)
Min
300
10
10
40
1
tRB
V
PFD
V
Typ
4.4
2.9
–100mV
BAT
7
M48T37Y, M48T37V
Max
200
tR
tREC
VALID
VALID
Max
4.5
3.0
AI03078
Unit
ms
µs
µs
µs
µs
YEARS
YEARS
Unit
CC
V
V
V
V
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