4

UCC5630

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

REG

TERMPWR

DISCNCT

TERMPWR

DIFFB

REG

DIFF B

TERMPWR

TERMPWR

4.7

4.7

0.1

4.7

µF

0.1

36

17

20

1

21

20k

20

21

1

CONTROL LINES

36

DISCNCT 17

CONTROL LINES

DIFFSENSE

DIFFSENSE

REG

TERMPWR

DISCNCT

DIFF B

4.7

36

17

1

21

DATA LINES (9)

20k

REG

TERMPWR

DIFFB

4.7

36

19

1

21

DATA LINES (9)

TERMPWR

REG

DIFFB

4.7

µF

21

1

DATA LINES (9)

36

DISCNCT 17

TERMPWR

REG

DIFFB

4.7

µF

21

1

DATA LINES (9)

36

DISCNCT 17

4.7

MSTR/SLV

19

19

MSTR/SLV

19

MSTR/SLV

19

MSTR/SLV

MSTR/SLV

19

DISCNCT

17

MSTR/SLV

APPLICATION INFORMATION

UDG-96211

Balancing capacitor is very important in high speed op-

eration. The typical balance between the positive (+) and

negative (–) signals is 0.1pF except for L8 and L9,

0.23pF and 0.4pF respecitvely on the MWP package.

The negative (–) signal has higher capacitance than the

positive (+) signal. The FQP package is typically 0.2pF

less than the MWP. Typical balance is 0.1pF except for

L8 and L3, where it is 0.4pF.

The master is selected by placing TRMPWR on

MSTR/SLV and the terminator enabled by grounding

DISCNCT, enabling the 1.3V regulator. The master is the

only terminator connected directly to DIFSENS bus line,

all the other terminators receive the mode signal by con-

necting the DIFFB pins together.

Note: The Master/Slave function will not be on future termina-

tors.

MSTR/SLV: Mode select for the non-controlling termina-

tor. MSTR enables the 1.3V regulator, when the termina-

tor is enabled. Note: Theis function will be removed on

further generations of the multimode terminators.

REG: Regulator bypass, must be connected to a 4.7

µF

capacitor.

SE: TTL compatible status bit indicating single ended de-

vice has been detected on DIFFB. The terminator is in

single ended mode.

PIN DESCRIPTIONS (cont.)