LX5226CDWP Microsemi Corporation, LX5226CDWP Datasheet - Page 4

• Manufacturer Part Number: LX5226CDWP
• Description: ULTRA 1 8 - LINE SCSI TERMINATOR
• Manufacturer: Microsemi Corporation

LX5226
4
Cable transmission theory suggests that in order to optimize
signal speed and quality, the termination should act both as
an ideal voltage reference when the line is released (deasserted)
and as an ideal current source when the line is active (asserted).
Common active terminators, which consist of Linear Regulators
in series with resistors (typically 110 ), are a compromise.
As the line voltage increases, the amount of current decreases
linearly by the equation V = I * R. The LX5226, with its unique
new architecture, applies the maximum amount of current
regardless of line voltage until the termination high threshold
(2.85V) is reached.
reproduces the optimum case when the device is enabled.
To enable the device a DISC pin must be pulled Logic Low.
During this mode of operation, quiescent current is 6mA and
the device will respond to line demands by delivering 24mA
on assertion and by imposing 2.85V on deassertion. In order
Acting as a near ideal line terminator, the LX5226 closely
PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
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L T R A
P
R O D U C T I O N
F U N C T I O N A L D E S C R I P T I O N
UltraMAX is a trademark of Linfinity Microelectronics Inc.
1 8 - L
I N E
S C S I T
D
to disable the device, the DISC pin must be driven logic High.
This mode of operation places the device in a sleep state where
a meager 150µA of quiescent current is consumed. Additionally,
all outputs are in a Hi-Z (impedance) state. Sleep mode can
be used for power conservation or to completely eliminate the
terminator from the SCSI chain.
active negation drivers.
An additional feature of the LX5226 is its compatibility with
A T A
E R M I N A T O R
P
DISC Pin
OWER
Open
S
H
L
H E E T
U
P
/ P
OWER
Outputs
Enabled
HI Z
HI Z
D
OWN
F
UNCTION
Quiescent
UltraMAX
Current
150µA
150µA
15mA
T
ABLE
Copyright © 1999
Rev. 1.0
5/99