3

UCC5619

PIN DESCRIPTIONS

DISCNCT: Taking this pin low causes all channels to

become high impedance, and the chip to go into

low-power mode; a high state or leaving it open allows

the channels to provide normal termination.

GND: Ground reference for the IC.

LINE1 - LINE27: 110

Ω termination channels.

REG: Output of the internal 2.7V regulator; bypass with a

4.7 F capacitor to GND.

TRMPWR: Power for the IC; bypass with a 4.7 F

capacitor to GND.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Output Section (CONT.)

22.4

mA

Output Leakage

DISCNCT = 0V, TRMPWR = 0V to 5.25V

10

400

nA

Output Capacitance

DISCNCT = 0V (Note 2)

2.5

4

pF

Regulator Section

Regulator Output Voltage

2.6

2.8

3.0

V

Drop Out Voltage

All Termination Lines = 0.2V

0.4

0.8

V

Short Circuit Current

−650

−900 –1300

mA

Sinking Current Capability

300

500

900

mA

Thermal Shutdown

170

°C

Thermal Shutdown Hysteresis

10

°C

Disconnect Section

Disconnect Threshold

0.8

1.5

2.0

V

Input Current

DISCNCT = 0V

–20

–60

µA

11

29

25

TERMPWR

DISCNCT

DATA BYTES

1AND 2

+2 PARITY BITS

7

REG

4.7

µF

4.7

µF

TO SCSI BUS

TERMPWR

17

LINE1

LINE27

CONTROL

BYTES

TO DRIVERS

AND

RECEIVERS

UCC5619

Figure 1. Typical wide SCSI bus configuration using the UCC5619

UDG-98072

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

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