Alternative 1 Termination For Single Ended Devices; Alternative 2 Termination For Single Ended Devices - Fujitsu C150-E049-02EN Oem Manual

M3099GX/GH OEM Manual
Termination
All signals not defined as RESERVED, GROUND, or TERMPWR
shall be terminated at both ends of the cable. The Implementor may
choose one of the following two methods to terminate each end (see
ANSI SCSI-2 ANSI SCSI-2 5.4 Electrical description):
Single-ended alternative (a) [Passive terminator]
TERMINATOR POWER
–SIGNAL
GROUND
Figure 3.2 Alternative 1 termination for Single Ended Devices
Single-ended alternative (b) [Active terminator]
Low dropout voltage regulater
Vin Imax 600mA
Vout = 2.85V
+
(See Note 1)
Vadj
Component Description
R1 121 , 1%, 0.25W
R2 154 , 1%, 0.25W
R3-R20 110 , 1%
C1 10 F Alum.15V or 4.7 F Tant. 15V
C2 150 F Alum.10V or 22 F Tant. 10V (ESR at 120 Hz < 4)
C3 0.1 F Ceramic 25V
NOTES
1 The voltage regulator shown is an adjustable type with Vref=1.25V.
R1 and R2 were selected to provide approximately 10mA Iquiescent.
The voltage regulator Vdropout shall be 1.25V or less at Imax.
2 Alternative values that provide lower performance at somewhat
lower cost use Vout 1%; R3 R20=100 ,2%
Figure 3.3 Alternative 2 termination for Single Ended Devices
The first termination method above is the same as in SCSI-1. The
second termination method is recommended for better signal quality.
220
330
Vout
+
R1
C2
R2
INTERFACE
R3
C3
R20
3-5