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X25320SM Datasheet(PDF) 2 Page - IC MICROSYSTEMS

Part # X25320SM
Description  SPI Serial E2PROM With Block LockTM Protection
Download  15 Pages
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Manufacturer  ICMIC [IC MICROSYSTEMS]
Direct Link  http://www.icmic.com
Logo ICMIC - IC MICROSYSTEMS

X25320SM Datasheet(HTML) 2 Page - IC MICROSYSTEMS

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X25320
2
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
NC
No Connect
3063 PGM T01
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
addresses, 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 X25320 is deselected and the SO
output pin is at high impedance and unless an internal
write operation is underway, the X25320 will be in the
standby power mode. CS LOW enables the X25320,
placing it in the active power mode. It should be noted that
after power-on, a HIGH to LOW transition on CS is
required prior to the start of any operation.
Write Protect (WP)
When WP is LOW and the nonvolatile bit WPEN is “1”,
nonvolatile writes to the X25320 status register 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 X25320 status
register. If the internal write cycle has already been
initiated, WP going LOW will have no effect on a write.
The WP pin function is blocked when the WPEN bit in the
status register is “0”. This allows the user to install the
X25320 in a system with WP pin grounded and still be able
to write to the status register. The WP pin functions
will be enabled when the WPEN bit is set “1”.
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
DIP/SOIC
TSSOP
X25320
X25320
3063 ILL F02.2
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
CS
SO
NC
NC
NC
WP
V
SS
1
2
3
4
5
6
7
V
CC
HOLD
NC
NC
NC
SCK
SI
14
13
12
11
10
9
8


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