參數(shù)資料
型號(hào): M93C66-DW7T
廠商: STMICROELECTRONICS
元件分類: PROM
英文描述: 256 X 16 MICROWIRE BUS SERIAL EEPROM, PDSO8
封裝: 0.169 INCH, TSSOP-8
文件頁數(shù): 28/31頁
文件大?。?/td> 590K
代理商: M93C66-DW7T
M93C86, M93C76, M93C66, M93C56, M93C46
6/31
MEMORY ORGANIZATION
The M93Cx6 memory is organized either as bytes
(x8) or as words (x16). If Organization Select
(ORG) is left unconnected (or connected to VCC)
the x16 organization is selected; when Organiza-
tion Select (ORG) is connected to Ground (VSS)
the x8 organization is selected. When the M93Cx6
is in stand-by mode, Organization Select (ORG)
should be set either to VSS or VCC for minimum
power consumption. Any voltage between VSS
and VCC applied to Organization Select (ORG)
may increase the stand-by current.
INTERNAL DEVICE RESET
In order to prevent inadvertent Write operations
during Power-up, a Power On Reset (POR) circuit
is included.
At Power-up and Power-down, the device must
not be selected (that is, the Chip Select Input (S)
must be driven Low) until the supply voltage
reaches the operating voltage VCC (as defined in
Tables 9, 10 and 11).
During Power-up (phase during which VCC is low-
er than VCCmin but increases continuously), the
device will not respond to any instruction until VCC
has reached the Power On Reset threshold volt-
age (this threshold is lower than the minimum VCC
operating voltage defined in DC AND AC PARAM-
ETERS). Once VCC has passed the POR thresh-
old, the device is reset.
Prior to selecting the memory and issuing instruc-
tions to it, a valid and stable VCC voltage must be
applied. This voltage must remain stable and valid
until the end of the transmission of the instruction
and, for a Write instruction, until the completion of
the internal write cycle (tW).
During Power-down (phase during which VCC de-
creases continuously), as soon as VCC drops from
the normal operating voltage below the Power On
Reset threshold voltage, the device stops re-
sponding to any instruction sent to it.
ACTIVE POWER AND STANDBY POWER MODES
When Chip Select (S) is High, the device is select-
ed and in the Active Power mode. It consumes
ICC, as specified in Tables 15, 16, 17, 18 and 19.
When Chip Select (S) is Low, the device is dese-
lected.
If no Erase/Write cycle is in progress when Chip
Select goes Low, the device enters the Standby
Power mode, and the power consumption drops to
ICC1.
For the M93Cx6 devices (5V range) the POR
threshold voltage is around 3V. For the M93Cx6-
W (3V range) and M93Cx6-R (2V range) the POR
threshold voltage is around 1.5V.
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