DS2119M
Table 1.
PIN DESCRIPTION
PIN
1
2–5, 7–12,
18–21, 23–26
6, 22
13
14
15
16
17
27, 28
SYMBOL
VREF
RxP,
RxN
HS GND
DESCRIPTION
Reference Voltage.
2.85V reference in SE mode and 1.25V reference in
LVD mode; must be decoupled with a 4.7µF cap.
Signal Termination.
Connect to SCSI bus signal lines.
Heat Sink Ground.
Internally connected to the mounting pad. Should
be grounded.
ISO
Isolation.
When pulled high, the DS2119M isolates its bus pins (RxP,
RxN) from the SCSI bus.
GND
Ground.
Signal ground; 0V.
MSTR/SLV
Master/Slave.
Mode-select for the noncontrolling terminator. When
pulled high, MSTR enables the DIFFSENSE driver.
DIFFSENSE
DIFFSENSE.
Output to drive the SCSI bus DIFFSENS line.
DIFF_CAP
DIFFSENSE CAPACITOR.
Connect a 0.1µF capacitor for
DIFFSENSE filter. Input to detect the type of device (differential or
single-ended) on the SCSI bus.
TPWR
Termination Power.
Connect to the SCSI TERMPWR line and
decouple with a 2.2µF capacitor.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Termpower Voltage
SE Mode
LVD Mode
Logic 0
Logic 1
Operating Temperature
SYMBOL
V
TPWR
(SE)
V
TPWR
(LVD)
V
IL
V
IH
V
AMB
MIN
4.0
2.7
-0.3
2.0
0
TYP
MAX
5.5
5.5
+0.8
V
TPWR
+ 0.3
70
UNITS
V
V
V
V
°C
NOTES
6 of 9
DALLAS [ DALLAS SEMICONDUCTOR ]
