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