UCC5638 datasheet(3/5 Pages) TI

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UCC5638

PIN DESCRIPTIONS

DIFFB: Diff sense filter pin should be connected at a

0.1 F capacitor.

DIFFSENS: The SCSI bus Diff Sense line to detect what

types of devices are connected to the SCSI bus.

DISCNCT: Disconnect pin shuts down the terminator

when it is not at the end of the bus. The disconnect pin

low enables the terminator.

Note: In Disconnect Mode, the comparitor set powers down for

low idle current.

LINE

n–: Signal line active line for single ended or nega-

tive line in differential applications for the SCSI bus.

LINE

n+: Ground line for single ended or positive line for

differential applications for the SCSI bus.

REG: Regulator bypass pin, must be connected to a

F capacitor.

TRMPWR: VIN 2.7V to 5.25V supply, bypass near the

terminator with a 4.7

µF capacitor to ground.

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA =TJ = 0°C to 70°C,

TRMPWR = 3.3V.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Single Ended Termination Section

Impedance

−

)

, (Note 3)

102.3

110

117.7

Termination Current

Signal Level 0.2V, All Lines Low

–21

–24

–25.4

Signal Level 0.5V

–18

–22.4

Output Leakage

400

Output Capacitance

Single Ended Measurement to Ground (Note 1)

Single Ended GND SE Impedance

I= 10mA

Disconnect and Diff Buffer Input Section

DISCNCT Threshold

0.8

2.0

DISCNCT Input Current

Diff Buffer Single Ended to LVD Threshold

0.5

0.7

Diff Buffer LVD to HPD Threshold

1.9

2.4

DIFFB Input Current

–10

Note 1: Guaranteed by design. Not 100% tested in production.

Note 2: Line+ (positive) tied to Line– (negative); []

–

(

max)

(

min)

VCM

Note 3: VLX= Output voltage for each terminator minus output pin (L1– through L15–) with each pin unloaded.

ILX = Output current for each terminator minus output pin (L1– through L15–) with the minus output pin forced to 0.2V.

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