MCCS142235DW ON Semiconductor, MCCS142235DW Datasheet - Page 9

• Manufacturer Part Number: MCCS142235DW
• Manufacturer: ON Semiconductor
• Type: SCSI Terminationr

Specifications of MCCS142235DW

• Termination Resistance (rt Or Rterm) (typ): 110Ohm
• Number Of Bits: 18
• Operating Supply Voltage (min): 2.75V
• Package Type: SOIC
• Mounting: Surface Mount
• Pin Count: 24
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

Enable Input Application
A. No Connection to Enable
B. Single Pole Switch to Supply
C. Double Pole Switch Between
D. Hardwired “Low”
E. Hardwired “High”
F. External Logic Driven
Supply and GND
Enable Signal Driven by Hardware
Switch or Jumper.
Figure 9. Recommended Connection Scheme to Disable LV
Result
Enable input will be pulled “LOW” internally. Termination will be disabled
causing all outputs to be high impedance.
Enable input will be pulled “LOW” internally when the switch is open. Enable
input will be held “HIGH” when the switch is closed. The supply source in this
case could be TERMPWR, VREG or V
This is a more expensive way to accomplish application B. above. It is more
economical to allow the internal pulldown to provide the “LOW” input level.
The Supply Source in this case could be TERMPWR, VREG or V
The MCCS142235 will be permanently disabled causing all outputs to be high
impedance.
The MCCS142235 will be permanently enabled providing 110Ω nominal
impedance to each bus line.
With LV
GND, the Local−V
feature is not desired, tie LV
state will follow the Truth Table.
10
11
12 GND
1
2
3
4
5
6
7
8
9
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Vref
Enable
O1
O2
O3
O4
O5
O6
O7
O8
O9
CC
input connected to the local power supply and V
9
VREG
LV
CC
O18
O17
O16
O15
O14
O13
O12
O10
O11
Test
CC
sensing and Enable latching feature will be active. If this
24
23
22
21
20
19
18
17
16
15
14
13
CC
Enable Latch Will Be Transparent as Long as VREG
(ie TERMPWR) Is Present. DC Standby Current for
All Analog Circuitry Associated With LV
Eliminated.
and V
ref
Connect to 2.85V Regulated Supply.
to VREG (per Figure 9), and the Enable
CC
CC
.
Feature
CC
ref
Will Be
connected to
CC
.