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ACE25C400 Datasheet(PDF) 4 Page - ACE Technology Co., LTD.

Part # ACE25C400
Description  4MB Serial Flash Memory
Download  31 Pages
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Manufacturer  ACE [ACE Technology Co., LTD.]
Direct Link  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE25C400 Datasheet(HTML) 4 Page - ACE Technology Co., LTD.

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ACE25C400
4MB Serial Flash Memory
VER 1.2
4
Pin descriptions
Serial Clock (CLK): The SPI Serial Clock Input (CLK) pin provides the timing for serial input and
output operations.
Serial Data Input, Output and I/Os (DI, DO and DQ0, DQ1): The ACE25C400 supports standard SPI
and Dual SPI operation. Standard SPI instructions use the unidirectional D I (input) pin to serially write
instructions, addresses or data to the device on the rising edge of the Serial Clock (CLK) input pin.
Standard SPI also uses the unidirectional DO (output) to read data or status from the device on the
falling edge of CLK.
Dual SPI instructions use the bidirectional DQ pins to serially write instructions, addresses or data to
the device on the rising edge of CLK and read data or status from the device on the falling edge of
CLK.
Chip Select (CS#): The SPI Chip Select (CS#) pin enables and disables device operation. When
CS# is high, the device is deselected and the Serial Data Output (DO, or DQ 0, DQ1) pins are at high
impedance. When deselected, the devices power consumption will be at standby levels unless an
internal erase, program or write status register cycle is in progress. When CS# is brought low, the
device will be selected, power consumption will increase to active levels and instructions can be
written to and data read from the device. After power-up, CS# must transition from high to low before
a new instruction will be accepted. The CS# input must track the VCC supply level at power -up (see
“9 Write Protection” and Figure 23). If needed a pull-up resister on CS# can be used to accomplish
this.
HOLD (HOLD#): The HOLD# pin allows the device to be paused while it is actively selected. When
HOLD# is brought low, while CS# is low, the DO pin will be at high impedance and signals on the DI
and CLK pins will be ignored (don’t care). When HOLD# is brought high, device operation can resume.
The HOLD# function can be useful when multiple devices are sharing the same SPI signals. The
HOLD# pin is active low.
Write Protect (WP#): The Write Protect (WP#) pin can be used to prevent the Status Registers from
being written.
Used in conjunction with the Status Register’s Block Protect (BP2, BP1 and BP0) bits
and Status Register Protect (SRP) bits, a portion as small as a 4KB sector or the entire memory array
can be hardware protected. The WP# pin is active low.


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