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参数资料
| 型号： | M48T35YSH |
| 厂商： | 意法半导体 |
| 英文描述： | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Red; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
| 中文描述： | 256千位的32KB的SRAM x8计时器 |
| 文件页数： | 5/19页 |
| 文件大小： | 148K |
| 代理商： | M48T35YSH |
5/19
M48T35AY, M48T35AV
DATA RETENTION MODE
With valid V
CC
applied, the M48T35AY/35AV op-
erates as a conventional BYTEWIDE static RAM.
Should the supply voltage decay, the RAM will au-
tomatically power-fail deselect, write protecting it-
self when V
CC
falls within the V
PFD
(max), VPFD
(min) window. All outputs become high imped-
ance, and all inputs are treated as "don’t care."
Note:
A power failure during a write cycle may cor-
rupt data at the currently addressed location, but
does not jeopardize the rest of the RAM’s content.
At voltages below V
PFD
(min), the user can be as-
sured the memory will be in a write protected state,
provided the V
CC
fall time is not less than t
F
. The
M48T35AY/35AV may respond to transient noise
spikes on V
CC
that reach into the deselect window
during the time the device is sampling V
CC
. There-
fore, decoupling of the power supply lines is rec-
ommended.
When V
CC
drops below V
SO
, the control circuit
switches power to the internal battery which pre-
serves data and powers the clock. The internal
button cell will maintain data in the M48T35AY/
35AV for an accumulated period of at least 7 years
when V
CC
is less than V
SO
. As system power re-
turns and V
CC
rises above V
SO
, the battery is dis-
connected, and the power supply is switched to
external V
CC
. Write protection continues until V
CC
reaches V
PFD
(min) plus t
REC
(min). E should be
kept high as V
CC
rises past V
PFD
(min) to prevent
inadvertent write cycles prior to processor stabili-
zation. Normal RAM operation can resume t
REC
after V
CC
exceeds V
PFD
(max).
Also, as V
CC
rises, the battery voltage is checked.
If the voltage is less than approximately 2.5V, an
internal Battery Not OK (BOK) flag will be set. The
BOK flag can be checked after power up. If the
BOK flag is set, the first write attempted will be
blocked. The flag is automatically cleared after the
first write, and normal RAM operation resumes.
Figure 9 illustrates how a BOK check routine could
be structured.
For more information on Battery Storage Life refer
to the Application Note AN1012.
CLOCK OPERATIONS
Reading the Clock
Updates to the TIMEKEEPER registers should be
halted before clock data is read to prevent reading
data in transition. Because the BiPORT TIME-
KEEPER cells in the RAM array are only data reg-
isters, and not the actual clock counters, updating
the registers can be halted without disturbing the
clock itself.
Updating is halted when a ’1’ is written to the
READ bit, D6 in the Control Register 7FF8h. As
long as a ’1’ remains in that position, updating is
halted.
After a halt is issued, the registers reflect the
count; that is, the day, date, and the time that were
current at the moment the halt command was is-
sued.
All of the TIMEKEEPER registers are updated si-
multaneously. A halt will not interrupt an update in
progress. Updating is within a second after the bit
is reset to a ’0’.
Table 4. AC Measurement Conditions
Note that Output Hi-Z is defined as the point where data is no longer
driven.
Input Rise and Fall Times
≤
5ns
Input Pulse Voltages
0 to 3V
Input and Output Timing Ref. Voltages
1.5V
Figure 4. AC Testing Load Circuit
AI02586
CL = 100pF
(or 5pF)
CL includes JIG capacitance
645
DEVICE
UNDER
TEST
1.75V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T36 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CMOS 32K x 8 TIMEKEEPER SRAM |
| M48T36Y-70MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CMOS 32K x 8 TIMEKEEPER SRAM |
| M48T37 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37V-10MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER? SRAM |
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