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SS7519

PIN DESCRIPTION

PIN

SYMBOL

DESCRIPTION

27,28

TPWR

4.0V to 5.75V power input pin. Connect to SCSI bus power line. A

4.7µF capacitor and a 0.1µF high frequency capacitor are recommended

between TPWR and ground.

1

VREF

Reference Voltage. Must be decoupled with a 4.7µF capacitor to

ground as shown in Figure 1.

6,22

14

HS GND

GND

Heat Sink Ground. These should be connected to large area PC board

ground trace in order to increase the power dissipation capability.

2,4,7,9,11,18

20,23,25

RxP

Termination lines. These lines switch to hard ground in SE mode and

are the positive lines for LVD mode. All lines are in high impedance

when HVD is detected.

3,5,8,10,12

19,21,24,26

RxN

Termination lines. These lines switch to the active lines in SE mode

and are the negative lines for LVD mode. All lines are in high

impedance when HVD is detected.

13

ISO

Isolate pin. This pin used to shut down the terminator if the terminator

is not connected at the end of the bus. Connect

ing the pin to ground will

activate the terminator in normal operation. The terminator will be

disabled when the pin is in high state. An internal pull-down resistor

assures that the SS7519 will operate as normal if the ISO pin is left

floating.

15

M/S

Mode select pin. When pull high, master mode will enable the

DIFFSEN drive SCSI bus. The DIFFSENSE driver is off when this pin

is connected to ground.

16

DIFFSENSE Mode Sense pin. This signal will drive 1.3V to the SCSI bus during the

Master mode in order to detect which type of device is connected to

the SCSI bus. On power up, the SS7519 will try to deliver LVD

level to the DIFFSENSE line. If only LVD SCSI devices are on the

bus, the DIFFSENSE signal will be successfully driven to 1.3V and the

terminator will configure the system for LVD operation. If any SE

device is on the bus, it will present a grounding level to the

DIFFSENSE line. This will

cause the SS7519 to configure into SE

operation.

The SS7519 will go into shutdown mode if DIFFSENSE

detects a high voltage level.

17

DIF_CAP

DIFFSENSE CAPACITOR. This pin should be connected to a 0.1uF

capacitor to ground and 20KΩ resistor to SCSI bus DIFFSENSE line

for DIFFSEN filter.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

MIN

TYP.

MAX

UNITS

Tpwr Voltage

4.0

5.75

V

Operating Temperature

0

70

℃

Lead Temperature

(Soldering 10 seconds)

300

℃

Rev.2.01 6/06/2003