DS2118M Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2118M Datasheet PDF : 8 Pages
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DS2118M
PIN DESCRIPTION Table 1
PIN
SYMBOL
DESCRIPTION
1
VREF Reference Voltage. 2.85 volt reference; must be decoupled with a 4.7
µF cap.
2, 3
NC
No Connect. Do not connect these pins.
4-7, 11-16,
RxP, Signal Termination. Connect to SCSI bus signal lines.
22-25, 29-32
RxN
8, 10, 26,
HS GND Heat Sink Ground. Internally connected to the mounting pad. Should
9, 28, 27
be grounded.
17
ISO
Isolation. When pulled high, the DS2118M isolates it’s bus pins (RxP,
FxP) from the SCSI bus.
18
GND Ground. Signal ground; 0.0 volts.
19
MSTR/SLV Master/slave. Mode select for the non-controlling terminator. When
pulled high (MSTR), the DIFFSENSE driver is enabled.
20
DIFFSENSE DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.
21
DIFF_CAP DIFFSENSE CAPACITOR. Connect 0.1 µF capacitor for
DIFFSENSE filter. Input to detect the type of device (differential or
single-ended) on the SCSI bus.
33
SE
Single-ended. SE output of DIFFSENSE receiver; indicates SE bus
operation.
34
LVD Low Voltage Differential. LVD output of DIFFSENSE receiver;
indicates LVD bus operation.
35
HVD High Voltage Differential. HVD output of DIFFSENSE receiver;
indicates HVD bus operation or thermal shutdown.
36
TPWR Termination Power. Connect to the SCSI TERMPWR line and
decouple with 2.2 µF capacitor.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN TYP
Termpower Voltage
Logic 0
Logic 1
Operating Temperature
Vtpwr
4.0
Vil
-0.3
Vih
2.0
Vamb
0
MAX
5.50
+0.8
Vtpwr + 0.3
70
UNITS
V
V
V
°C
NOTES
SINGLE ENDED CHARACTERISTICS
PARAMETER
SYMBOL
MIN
SE Termination Resistance
Rse
104.5
SE Voltage Reference
SE Output Current
Vref
2.79
lose
Output Capacitance
Cout
TYP
110
MAX
115.5
2.93
25.4
3
UNITS
Ohms
Volts
mA
pF
NOTES
Vline=0-
3.0 volts
Vline =
0.2 volts
guaranteed
by design
6 of 8
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