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M48T129Y-85CS1 Datasheet(PDF) 8 Page - STMicroelectronics

Part # M48T129Y-85CS1
Description  3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T129Y-85CS1 Datasheet(HTML) 8 Page - STMicroelectronics

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M48T129Y, M48T129V
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Table 7. Power Down/Up Trip Points DC Characteristics (1)
(TA = 0 to 70 °C)
Note: 1. All voltages referenced to VSS.
2. At 25
°C.
Table 8. Power Down/Up AC Characteristics
(TA = 0 to 70 °C)
Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 50µs after VCC passes
VPFD (min).
2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
Symbol
Parameter
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T129Y
4.2
4.35
4.5
V
M48T129V
2.7
2.9
3.0
V
VSO
Battery Back-up Switchover Voltage
M48T129Y
3.0
V
M48T129V
VPFD –100mV
V
tDR
(2)
Expected Data Retention Time
10
YEARS
Symbol
Parameter
Min
Max
Unit
tF
(1)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB
(2)
VPFD (min) to VSS VCC Fall Time
M48T129Y
10
µs
M48T129V
150
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
10
µs
tRB
VSS to VPFD (min) VCC Rise Time
1
µs
tREC
VPFD (max) to RST High
40
200
ms
Figure 6. Power Down/Up Mode AC Waveforms
AI01805
VCC
INPUTS
OUTPUTS
DON’T CARE
HIGH-Z
tF
tFB
tR
tRB
VALID
VALID
RECOGNIZED
RECOGNIZED
VPFD (max)
VPFD (min)
VSO
tREC
RST


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