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X25040GP Datasheet(PDF) 2 Page - IC MICROSYSTEMS

Part # X25040GP
Description  SPI Serial E2PROM with Block LockTM Protection
Download  14 Pages
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Manufacturer  ICMIC [IC MICROSYSTEMS]
Direct Link  http://www.icmic.com
Logo ICMIC - IC MICROSYSTEMS

X25040GP Datasheet(HTML) 2 Page - IC MICROSYSTEMS

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X25040
2
PIN DESCRIPTIONS
Serial Output (SO)
SO is a push/pull serial data output pin. During a read
cycle, data is shifted out on this pin. Data is clocked out
by the falling edge of the serial clock.
Serial Input (SI)
SI is the serial data input pin. All opcodes, byte ad-
dresses, and data to be written to the memory are input
on this pin. Data is latched by the rising edge of the serial
clock.
Serial Clock (SCK)
The Serial Clock controls the serial bus timing for data
input and output. Opcodes, addresses, or data present
on the SI pin are latched on the rising edge of the clock
input, while data on the SO pin change after the falling
edge of the clock input.
Chip Select (
CS)
When
CS is HIGH, the X25040 is deselected and the SO
output pin is at high impedance and unless an internal
write operation is underway, the X25040 will be in the
standby power mode.
CS LOW enables the X25040,
placing it in the active power mode. It should be noted
that after power-up, a HIGH to LOW transition on
CS is
required prior to the start of any operation.
Write Protect (
WP)
When
WP is LOW, nonvolatile writes to the X25040 are
disabled, but the part otherwise functions normally.
When
WP is held HIGH, all functions, including nonvola-
tile writes operate normally.
WP going LOW while CS is
still LOW will interrupt a write to the X25040. If the
internal write cycle has already been initiated,
WP going
LOW will have no affect on a write.
Hold (
HOLD)
HOLD is used in conjunction with the CS pin to select the
device. Once the part is selected and a serial sequence is
underway,
HOLD may be used to pause the serial
communication with the controller without resetting the
serial sequence. To pause,
HOLD must be brought LOW
while SCK is LOW. To resume communication,
HOLD is
brought HIGH, again while SCK is LOW. If the pause
feature is not used,
HOLD should be held HIGH at all
times.
PIN CONFIGURATION
PIN NAMES
Symbol
Description
CS
Chip Select Input
SO
Serial Output
SI
Serial Input
SCK
Serial Clock Input
WP
Write Protect Input
VSS
Ground
VCC
Supply Voltage
HOLD
Hold Input
6451 PGM T01
6451 FHD F02.1
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
DIP/SOIC
X25040


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