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> 10 pcs. dallas# DS2108S, term scsi diff/switch 24-soic
10 pcs. dallas# DS2108S, term scsi diff/switch 24-soic
The following item has just been added to our store in a larger qty. This item is for 10 pcs. only!
IC TERM SCSI DIFF/SWITCH 24-SOIC
Differential SCSI Switchable Terminator
Fully compliant with SCSI, SCSI-2 and SCSI-
Conforms to EIA RS-485 standard
Provides differential termination for 9 pairs of
Operates with SCSI signal voltages of -7 to
Laser-trimmed 330 and 150-ohm termination
resistors have 5% tolerance over full
Low power down capacitance of 6 pF
The DS2108 SCSI Terminator has been specifically designed for High Voltage Differential (HVD) SCSI
systems requiring switchable termination. The DS2108 integrates eighteen 330-ohm and nine 150-ohm
precise switched termination resistors into a monolithic IC. The surface mount SOIC package saves board
space over conventional resistor SIPs. The termination resistors can be isolated from the SCSI bus under
software or hardware control. While in the powered down mode, the DS2108 isolates the nine terminator
blocks from the bus while adding only 6 pF capacitance to each signal line of the SCSI bus.
The DS2108 consists of power-down circuitry, eighteen 330-ohm and nine 150-ohm termination resistors
(Figure 1). The DS2108 can be removed from the circuit by bringing the power down pin (PD) low. The
power down capacitance on the terminating resistors is 6 pF, well below the SCSI-3 allotment of 25 pF.
The DS2108 supports SCSI signal voltages of -7 to +12 volts when powered on or off. When all lines
settle into the quiescent state (no signal transitions), 56 mA is typically consumed. Only 1 mA is
typically consumed in the powered down mode.
