m35b32 STMicroelectronics, m35b32 Datasheet - Page 29

• Manufacturer Part Number: m35b32
• Description: 32 Kbit, 256-byte Page, Fast Program Eeprom Memory Accessed By Spi Bus Interface
• Manufacturer: STMicroelectronics

M35B32
7
7.1
7.1.1
7.1.2
7.1.3
Power-up and power-down
Supply voltage (V
Operating supply voltage V
Prior to selecting the memory and issuing instructions to it, a valid and stable V
within the specified [V
secure a stable DC supply voltage, it is recommended to decouple the V
suitable capacitor (usually of the order of 10 nF to 100 nF) close to the V
pins.
This voltage must remain stable and valid until the end of the transmission of the instruction
and, for write, program and erase instructions, until the completion of the internal write,
program or erase cycle, respectively.
Power-up conditions
When the power supply is turned on, V
time, the Chip Select (S) line is not allowed to float but should follow the V
therefore recommended to connect the S line to V
In addition, the Chip Select (S) input offers a built-in safety feature, as this input is edge-
sensitive as well as level-sensitive: after power-up, the device does not become selected
until a falling edge has first been detected on Chip Select (S). This ensures that Chip Select
(S) must have been high, prior to going low to start the first operation.
The V
Internal reset during power up
In order to prevent inadvertent write operations during power-up (continuous rise of V
power on reset (POR) circuit is included. At power-up, the device does not respond to any
instruction until the V
lower than the minimum V
Until V
following state:
●
●
●
The BP3, BP2, BP1 and BP0 bits of the Status Register are unchanged from the previous
power down (they are non-volatile bits).
Standby Power mode
deselected (at next power-up, a falling edge is required on Chip Select (S) before any
instruction can be started)
Status register:
–
–
CC
CC
rise time must not vary faster than 1 V/µs.
the Write Enable Latch (WEL) is reset to 0
the Write In Progress (WIP) is reset to 0
has passed over the POR threshold, the device is reset, then the device is in the
CC
CC
has reached the power on reset threshold voltage (this threshold is
(min), V
CC
CC
operating voltage defined in
)
Doc ID 18391 Rev 3
CC
CC
(max)] range must be applied (see
CC
continuously rises from V
CC
via a suitable pull-up resistor.
Table
Power-up and power-down
6).
SS
Table
to V
CC
CC
CC
CC
/V
line with a
6). In order to
voltage, it is
. During this
SS
CC
package
voltage
CC
29/42
), a