X9409 Xicor, X9409 Datasheet - Page 10

• Manufacturer Part Number: X9409
• Description: Quad Digitally Controlled Potentiometers
• Manufacturer: Xicor

SYMBOL TABLE
Increment/Decrement Wiper Counter Register (WCR)
Global Transfer Data Register (DR) to Wiper Counter Register (WCR)
Global Transfer Wiper Counter Register (WCR) to Data Register (DR)
X9409 – Preliminary Information
REV 1.6 1/30/03
R
S
A
R
S
T
A
T
S
T
A
R
T
T
T
WAVEFORM
device type
0 1 0 1
0 1 0 1
0 1 0 1
device type
device type
identifier
identifier
identifier
A
3
INPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
addresses
A
A
3
3
addresses
addresses
device
A
2
device
device
A
2
A
2
A
1
A
1
A
1
A
0
A
0
A
0
S
A
C
K
OUTPUTS
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
C
S
A
K
C
S
A
K
1 0 0 0
instruction
0 0 1 0 0 0
opcode
0 0 0 1
instruction
instruction
opcode
opcode
R
1
addresses
R
1
R
addresses
0
addresses
DR
www.xicor.com
WCR
R
0
0 0
DR
P
1
0 0
P
0
C
S
A
K
Guidelines for Calculating Typical Values of Bus
Pull-Up Resistors
S
A
C
K
O
S
T
P
S
A
C
K
D
I/
O
S
P
T
(sent by master on SDA)
HIGH-VOLTAGE
increment/decrement
WRITE CYCLE
D
I/
.
120
100
40
20
.
80
60
0
0
Characteristics subject to change without notice.
.
Min.
Resistance
20
Bus Capacitance (pF)
.
R
R
Max.
Resistance
MIN
MAX
D
I/
40
=
=
D
I/
V
I
C
OL MIN
60
CC MAX
t
BUS
R
O
S
T
P
80 100 120
=1.8KΩ
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