X9251US24IZ-2.7 Intersil, X9251US24IZ-2.7 Datasheet - Page 10

• Manufacturer Part Number: X9251US24IZ-2.7
• Description: IC XDCP QUAD 256TAP 50K 24-SOIC
• Manufacturer: Intersil
• Series: XDCP™r

Specifications of X9251US24IZ-2.7

• Taps: 256
• Resistance (ohms): 50K
• Number Of Circuits: 4
• Temperature Coefficient: 300 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Resistance In Ohms: 50K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Instruction Format
Read Wiper Counter Register (WCR)
Write Wiper Counter Register (WCR)
Read Data Register (DR)
Write Data Register (DR)
Global Transfer Data Register (DR) to Wiper Counter Register (WCR)
NOTES:
1. “A1 ~ A0”: stands for the device addresses sent by the master.
2. WPx refers to wiper position data in the Counter Register
3. “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
4. “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Falling
Falling
Falling
Falling
Falling
Edge
Edge
Edge
Edge
Edge
CS
CS
CS
CS
CS
0
0
0
0
0
Device Type
Device Type
Device Type
Device Type
Device Type
Identifier
Identifier
Identifier
Identifier
Identifier
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
Addresses
Addresses
Addresses
0
Addresses
Addresses
Device
10
0
Device
0
Device
0
0
Device
Device
A1 A0
A1 A0
A1 A0
A1 A0
A1
A0
1
1
Instruction
1
1
Opcode
Instruction
0
Instruction
Instruction
Opcode
1
Instruction
Opcode
Opcode
0
Opcode
0
0
0
0
1
1
0
0
0
1
0
1
1
RB RA
RB
DR and WCR
0
0
RB
Addresses
DR and WCR
Addresses
Addresses
Addresses
X9251
Addresses
RA
0
0
WCR
WCR
RA
P1
DR
0
0
P1
0
0
P0
0
P0
W
0
C
R
W
7
C
R
7
D
7
(Sent by X9251 on SO)
D
W
7
C
R
W
6
Rising
C
R
6
(Sent by Host on SI)
Edge
D
6
(Sent by Host on SI)
CS
(Sent by X9271 on SO)
D
W
6
Wiper Position
C
R
W
C
R
5
5
D
5
Data Byte
Data Byte
D
W
5
C
R
W
4
C
R
4
D
4
Data Byte
D
W
4
C
R
W
3
C
R
3
D
3
D
W
3
C
R
W
2
C
R
2
D
2
D
W
2
C
R
W
1
C
R
1
D
1
D
W
1
C
R
W
0
C
R
0
D
0
D
0
Rising
Rising
Rising
Edge
Edge
Edge
CS
CS
CS
Rising
Edge
CS
HIGH-VOLTAGE
WRITE CYCLE
April 13, 2007
FN8166.5