參數(shù)資料
型號(hào)： LXT914PC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁(yè)數(shù)： 37/42頁(yè)
文件大小： 561K
代理商： LXT914PC
Flexible Quad Ethernet Repeater
—
LXT914
Datasheet
37
Output rise / fall time
–
–
3
8
ns
C
LOAD
= 20 pF
RESET pulse width
PW
RESE
T
1.0
–
–
ms
V
CC
= 4.75 V
RESET fall time
TF
RESET
–
–
20.0
μ
s
V
IHRESET
to V
ILRESET
Table 23. AUI Electrical Characteristics
(over recommended range)
Parameter
Symbol
Min
Typ
Max
Units
Test Conditions
Input Low current
I
IL
–
–
-700
μ
A
Input High current
I
IH
–
–
500
μ
A
Differential output voltage
V
OD
±550
–
±1200
mV
Receive input impedance
Z
IN
–
20
–
k
Between CIP/CIN & DIP/
DIN
Differential squelch threshold
V
DS
–
220
–
mV
Typical values are at 25
°
C and are for design aid only; they are not guaranteed and not subject to
production testing.
Table 24. Twisted-Pair Electrical Characteristics
(over recommended range)
Parameter
Symbol
Min
Typ
1
Max
Units
Test Conditions
Transmit output impedance
Z
OUT
–
5
–
Peak differential output voltage
V
OD
3.3
3.5
3.7
V
Load = 100
at TPOP
and TPON
Transmit timing jitter addition
–
–
± 6.4
± 10
ns
0 line length
Transmit timing jitter added by
the MAU and PLS sections
2
–
–
± 3.5
± 5.5
ns
After line model specified
by IEEE 802.3 for
10BASE-T
Receive input impedance
Z
IN
–
20
–
k
Between TPIP/TPIN
Differential squelch threshold
(Normal threshold: ERSQ
x
= 0)
V
DS
300
420
565
mV
5 MHz square wave input
Differential squelch threshold
(Reduced threshold: ERSQ
x
= 1)
V
DSL
180
250
345
mV
5 MHz square wave input
NOTES:
1. Typical values are at 25
°
C and are for design aid only; they are not guaranteed and not subject to
production testing.
2. IEEE 802.3 specifies maximum jitter additions at 1.5 ns for the AUI cable, 0.5 ns from the encoder, and 3.5
ns from the MAU.
Table 22. I/O Electrical Characteristics
1
(over recommended range)
Parameter
Symbol
Min
Typ
2
Max
Units
Test Conditions
NOTES:
1. Not applicable to IRB signals. IRB electrical characteristics are specified in
Table 25
.
2. Typical values are at 25
°
C and are for design aid only; they are not guaranteed and not subject to
production testing.
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