PIN DESCRIPTION
PIN
1
2–5, 7–12,
18–21, 23–26
6, 22
13
14
15
16
17
27, 28
NAME
VREF
RxP,
RxN
HS GND
FUNCTION
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.
Isolation.
When pulled high, the DS2119M isolates its bus pins (RxP,
ISO
RxN) from the SCSI bus.
GND
Ground.
Signal ground; 0V.
Master/Slave.
Mode-select for the noncontrolling terminator. When
MSTR/SLV
pulled high, MSTR enables the DIFFSENSE driver.
DIFFSENSE
DIFFSENSE.
Output to drive the SCSI bus DIFFSENS line.
DIFFSENSE Capacitor.
Connect a 0.1µF capacitor for DIFFSENSE
DIFF_CAP filter. Input to detect the type of device (differential or single-ended) on
the SCSI bus.
Termination Power.
Connect to the SCSI TERMPWR line and
TPWR
decouple with a 2.2µF capacitor.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Termpower
Voltage
Logic 0
Logic 1
Operating Temperature
SE Mode
LVD Mode
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
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
