ml6509 Microsemi Corporation, ml6509 Datasheet - Page 2

• Manufacturer Part Number: ml6509
• Description: Active Scsi Terminator
• Manufacturer: Microsemi Corporation

ML6509
GENERAL DESCRIPTION
One unique feature of the ML6509 is its support for a Low
Power mode, for use in Notebook and portable computer
applications, where it provides a 1mA (approximately
2.5K termination) for less than 6" cable lengths. This
minimizes the battery drain significantly in such systems.
PIN CONFIGURATION
PIN DESCRIPTION
2
NOTE :
TERMPWR
NAME
L1
L2
L3
L4
L5
L6
L7
L8
L9
The DISCNKT and LPWR lines have 200ký internal pullup resistors
connected to the supply. These pins should be left floating for normal
operation and should be connected to ground to enable the function.
TERMPWR
DISCNKT
LPWR
GND
NC
NC
L1
L2
DESCRIPTION
Termination Power. Should be connected
to the SCSI TERMPWR line. A 10µF
tantalum local bypass capacitor is
recommended per system, as shown in
the application diagram
Signal Termination 1. SCSI bus line 1
Signal Termination 2. SCSI bus line 2
Signal Termination 3. SCSI bus line 3
Signal Termination 4. SCSI bus line 4
Signal Termination 5. SCSI bus line 5
Signal Termination 6. SCSI bus line 6
Signal Termination 7. SCSI bus line 7
Signal Termination 8. SCSI bus line 8
Signal Termination 9. SCSI bus line 9
1
2
3
4
5
6
7
8
16-Pin SOIC
16
15
14
13
12
11
10
(Continued)
9
L9
L8
L7
V
L6
L5
L4
L3
REF
Current limiting and thermal shutdown protection are also
provided. The nine line configuration is optimal for wide
SCSI’s 18, 27, or 45 line termination needs.
DISCNKT
NAME
LPWR
GND
V
TERMPWR
HS
DISCNKT
REF
LPWR
GND
NC
NC
HS
HS
L1
L2
DESCRIPTION
2.85V
with a 10µF tantalum in parallel with a
0.1µF ceramic capacitor is
recommended, as shown in the
application diagram.
Disconnect Terminator. Logic input to
disconnect the terminator from the bus
when the SCSI device no longer needs
termination due to not being the last
device on the bus or otherwise. Active
low input.
Low Power Mode. Logic input to switch
the terminator mode to a ~2.5k
termination, with a 1mA drive capability,
meant for power conscious battery
applications which use SCSI devices
supporting cable lengths less than six
inches. Active low input.
Ground. Signal Ground (0V)
Heat Sink Ground. Should be connected
to GND.
10
1
2
3
4
5
6
7
8
9
20-Pin TSSOP
REF
Output. External decoupling
20
19
18
17
16
15
14
13
12
11
L9
L8
HS
L7
V
L6
L5
L4
HS
L3
REF