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PM25LD512 Datasheet(PDF) 27 Page - List of Unclassifed Manufacturers

Part No. PM25LD512
Description  512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus
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Maker  ETC2 [List of Unclassifed Manufacturers]
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Pm25LD512/010/ 020
Confidential information
Chingis Technology Corp.
27
DRAFT Date: August, 2010, Rev:0.4
POWER-UP AND POWER-DOWN
At Power-up and Power-down, the device must not be
selected (CE# must follow the voltage applied on Vcc)
until Vcc reaches the correct value:
- Vcc(min) at Power-up, and then for a further delay of
tVCE
- Vss at Power-down
Usually a simple pull-up resistor on CE# can be used
to insure safe and proper Power-up and Power-down.
To avoid data corruption and inadvertent write
operations during power up, a Power On Reset (POR)
circuit is included. The logic inside the device is held
reset while Vcc is less than the POR threshold value
(Vwi) during power up, the device does not respond to
any instruction until a time delay of tPUW has elapsed
after the moment that Vcc rised above the VWI
threshold. However, the correct operation of the device
is not guaranteed if, by this time, Vcc is still below
Vcc(min). No Write Status Register, Program or Erase
instructions should be sent until the later of:
- tPUW after Vcc passed the VWI threshold
- tVCE after Vcc passed the Vcc(min) level
At Power-up, the device is in the following state:
- The device is in the Standby mode
- The Write Enable Latch (WEL) bit is reset
At Power-down, when Vcc drops from the operating
voltage, to below the Vwi, all write operations are
disabled
and the device does not respond to any write
instruction.
Chip Selection Not Allowed
All Write Commands are Rejected
tVCE
Read Access Allowed
Device fully accessible
tPUW
Vcc
Vcc(max)
Vcc(min)
Reset State
V (write inhibit)
Time
Symbol
Parameter
Min.
Max.
Unit
tVCE
*1
Vcc(min) to CE# Low
10
us
tPUW
*1
Power-Up time delay to Write instruction
1
10
ms
VWI
*1
Write Inhibit Voltage
2.1
V
Note : *1. These parameters are characterized only.
1.8
1.6




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