X25320
PIN DESCRIPTIONS
Serial Output (SO)
Hold (HOLD)
HOLD isusedinconjunctionwiththeCSpintoselectthe
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.
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.
PIN CONFIGURATION
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.
DIP/SOIC
CS
SO
WP
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
X25320
TSSOP
V
SS
Chip Select (CS)
WhenCS isHIGH, theX25320isdeselectedandtheSO
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.
CS
SO
NC
NC
NC
WP
1
2
3
4
5
6
7
14
13
12
11
10
9
V
CC
HOLD
NC
X25320
NC
NC
Write Protect (WP)
SCK
SI
V
8
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.
WhenWP isheldHIGH, allfunctions, includingnonvola-
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.
SS
3063 ILL F02.2
PIN NAMES
SYMBOL
DESCRIPTION
CS
SO
Chip Select Input
Serial Output
Serial Input
The WP pin function is blocked when the WPEN bit in
thestatusregisteris“0”.Thisallowstheusertoinstallthe
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”.
SI
SCK
WP
VSS
VCC
HOLD
NC
Serial Clock Input
Write Protect Input
Ground
Supply Voltage
Hold Input
No Connect
3063 PGM T01
2
XICOR [ XICOR INC. ]
