Figure 4.5.4 B-Cable Driver/Receiver - Fujitsu M2361A Customer Engineering Manual

(2) B-cable
R3
:OCX:X>---+--e-
I
~R4
SN75110 I.
IS
m max.
f'
R2 SN75107/108
Note: 1) The cable shall be flat with characteristic impedance of lOOn
±
Ion.
Refer to Section 2.5 for cable usage.
2) Line terminators Rl and R2 (82n ±s%, l/l0W) are located on the
input terminal of the disk drive.
3) Line protectors R3 and R4 (470n ±S%, l/l0W) are located on the
control unit or the input terminal of the disk drive.
But to improve the reliability of the transmission at the high
transfer rate (over 2MB/S), the resistors R3 and R4 of the IF
WRITE CLOCK, WRITE CLOCK, WRITE DATA, READ CLOCK and READ DATA
lines on the control unit and disk drive unit should be
eliminated.
4) Time delay of the cable is approximately sns/m.
Transfer time and delay of the Receiver (SN7sl07) is 19ns
nominal for both high and low signals.
5) To prevent false operation of the receiver, due to interface
disturbances during a power failure of the unit, the bias
resistors, as shown below, are used on the controller side for
Unit Selected and Seek End signals.
6) Maximum cable length is 15 meters.
7) Rs and R6 (ISKn ±s%, 1/10W) are used to prevent the receiver
output signal from oscillating when input signals are both high
as follows:
04
SN75110 Input
H: OV
I
IX
L-O.9U
SN7 5110 Output
IOns
~
To $ 35ns
SN75107 Output-t _ _ _ _ _
- - J
Figure 4.5.4 B-cable driver/receiver
B03P-482s-0002A ••• Ol
4 - 23