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M48T35AV-70MH6 Datasheet(PDF) 7 Page - STMicroelectronics

Part # M48T35AV-70MH6
Description  256 Kbit 32Kb x8 TIMEKEEPER SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T35AV-70MH6 Datasheet(HTML) 7 Page - STMicroelectronics

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M48T35AY, M48T35AV
Table 7. Power Down/Up Trip Points DC Characteristics (1)
(TA = 0 to 70 °C or –40 to 85 °C)
Note: 1. All voltages referenced to VSS.
2. CAPHAT and M4T32-BR12SH1 SNAPHAT only, M4T28-BR12SH1 SNAPHAT top tDR = 7 years (typ).
3. Using larger M4T32-BR12SH6 SNAPHAT top (recommended for Industrial Temperature Range - grade 6 device).
Table 8. Power Down/Up AC Characteristics
(TA = 0 to 70 °C or –40 to 85 °C)
Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC pass-
es VPFD (min).
2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
3. tREC (min) = 20ms for industrial temperature grade 6 device.
Symbol
Parameter
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T35AY
4.2
4.35
4.5
V
M48T35AV
2.7
2.9
3.0
V
VSO
Battery Back-up Switchover Voltage
M48T35AY
3.0
V
M48T35AV
VPFD –100mV
V
tDR
Expected Data Retention Time (at 25°C)
Grade 1
10 (2)
YEARS
Grade 6
10 (3)
YEARS
Symbol
Parameter
Min
Max
Unit
tPD
E or W at VIH before Power Down
0µs
tF
(1)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB
(2)
VPFD (min) to VSS VCC Fall Time
M48T35AY
10
µs
M48T35AV
150
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
10
µs
tRB
VSS to VPFD (min) VCC Rise Time
1µs
tREC
(3)
VPFD (max) to Inputs Recognized
40
200
ms
Figure 5. Power Down/Up Mode AC Waveforms
AI01168C
VCC
INPUTS
(PER CONTROL INPUT)
OUTPUTS
DON'T CARE
HIGH-Z
tF
tFB
tR
tPD
tRB
tDR
VALID
VALID
(PER CONTROL INPUT)
RECOGNIZED
RECOGNIZED
VPFD (max)
VPFD (min)
VSO
tREC


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