M48T08-100PC1E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M48T08-100PC1E Datasheet PDF : 27 Pages
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M48T08, M48T08Y, M48T18
Figure 14. Power Down/Up Mode AC Waveforms
VCC
VPFD (max)
VPFD (min)
VSO
tF
tDR
tPD
tFB
tRB
tPFX
INT
INPUTS
RECOGNIZED
DON'T CARE
tR
tPFH
NOTE
trec
RECOGNIZED
OUTPUTS
VALID
HIGH-Z
VALID
(PER CONTROL INPUT)
(PER CONTROL INPUT)
AI00566
Note: Inputs may or may not be recognized at this time. Caution should be taken to keep E1 high or E2 low as VCC rises past VPFD (min).
Some systems may perform inadvertent WRITE cycles after VCC rises above VPFD (min) but before normal system operations begin.
Even though a power on reset is being applied to the processor, a reset condition may not occur until after the system clock is running.
Table 10. Power Down/Up AC Characteristics
Symbol
Parameter(1)
Min
Max
Unit
tPD
E1 or W at VIH or E2 at VIL before Power Down
0
µs
tF(2)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB(3)
VPFD (min) to VSS VCC Fall Time
10
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
0
µs
tRB
VSS to VPFD (min) VCC Rise Time
1
µs
trec
E1 or W at VIH or E2 at VIL before Power Up
1
ms
tPFX
INT Low to Auto Deselect
10
40
µs
tPFH
VPFD (max) to INT High
120
µs
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).
2. 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).
3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
Table 11. Power Down/Up Trip Points DC Characteristics
Symbol
Parameter(1,2)
Min
Typ
Max
Unit
VPFD Power-fail Deselect Voltage
M48T08
4.5
4.6
4.75
V
M48T18/T08Y 4.2
4.3
4.5
V
VSO
Battery Back-up Switchover Voltage
3.0
V
tDR
Expected Data Retention Time
10(3)
YEARS
Note: 1. All voltages referenced to VSS.
2. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).
3. At 55°C, VCC = 0V; tDR = 8.5 years (typ) at 70°C. Requires use of M4T32-BR12SH SNAPHAT® top when using the SOH28 package.
20/27
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