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| 型號(hào)： | EPIC |
| 英文描述： | EPiC Family Product Line (304k) |
| 中文描述： | 史詩(shī)系列產(chǎn)品線（304k） |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大小： | 304K |
| 代理商： | EPIC |
7
www.semtech.com
HIGH PERFORMANCE PRODUCTS
Revision 1/December 3, 2001
AN1001
The 50
W double termination output structure is opti-
mized for applications with the following characteristics:
a) series (or source) termination and parallel
termination
b) point to point routing of a different signal
c)
50
W transmission lines
In this environment, the double termination output of-
fers the smallest footprint solution for accurate signal
distribution.
Note: The double termination output does not function
Correctly without a 100
W termination resistor at the
destination.
3) 50
W Source Termination
part. No translator is required for most (virtually all)
different standard digital technologies.
There is no headroom requirement on the inputs on a
digital high vs. VCC or a digital low vs. VEE. This is
important because it allows the EPiC Families to share
a VCC and VEE with a CMOS ASIC and receive rail-to-
rail swings without having any functional or perfor-
mance degradations.
SK44XX Truth Table
Differential Inputs / Outputs (con’d)
The open emitter is the standard ECL output. It is flex-
ible in that it supports point to point routing or daisy
chain lines, a wide range of transmission line character-
istic impedances, and a variety of termination schemes.
Refer to AN1003 for ECL/PECL Signal Termination Tech-
niques.
There are four basic output structures supported by
the EPiC product line. Each configuration is opti-
mized for a specific transmission line topology in
order to allow the maximum level of overall system
level performance and integration.
Default Conditions
It is good practice to tie all unused inputs to a known,
stable, valid voltage level. However, several signals
have internal pull up or pull down resistors and, there-
fore, have a known state when left floating. The fol-
lowing chart summarizes the default conditions on the
44XX inputs.
Q
Q*
l
a
n
g
i
S
e
t
a
t
S
t
l
u
a
f
e
D
e
d
o
M
*
N
I
/
N
I
l
a
n
r
e
t
n
I
o
N
s
r
o
t
s
i
s
e
R
t
a
o
l
f
T
O
N
o
D
*
K
L
C
/
K
L
C
l
a
n
r
e
t
n
I
o
N
s
r
o
t
s
i
s
e
R
t
a
o
l
f
T
O
N
o
D
*
L
E
S
/
L
E
Sw
o
L
/
h
g
i
H
s
u
o
n
o
r
h
c
n
y
s
A
n
o
i
t
a
r
e
p
O
*
N
E
/
N
Ew
o
L
/
h
g
i
He
v
i
t
c
A
s
t
u
p
t
u
O
Output Configuration Options
1) Open Emitter
2) Double Termination
Q
Zo
6 mA
Q*
Rext
RT = 2* Zo
Rext
Zo
6 mA
Q
Zo = 50
50
50
Q*
Zo = 50
8 mA
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