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DS3886A Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DS3886A
Description  BTL 9-Bit Latching Data Transceiver
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DS3886A Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Pin Description (Continued)
nected to the backplane ground). If the external ground floats considerably during transients, precautionary steps should be taken to prevent QGND from moving with
reference to the backplane ground. The receiver threshold should have the same ground reference as the signal coming from the backplane. A voltage offset between
their grounds will degrade the noise margin.
Note 12: The same considerations for ground are used for V CC in reducing lead inductance (see (Note 10) ). QVCC and VCC should be tied together externally. If
live insertion is not supported, the LI pin can be tied together with QV CC and VCC.
CD
T/R
LE
RBYP
ACK
An
Bn
HX
X
X
X
Z
H
LH
X
H
X
L
H
LH
X
H
X
H
L
LH
X
L
X
X
Bn
0
L
H
X
L
L-H
H
L
L
H
X
L
L-H
L
H
LL
H
X
X
H
L
LL
H
X
X
L
H
LLL
X
X
An
0
X
X = High or low logic state
Z = High impedance state
L = Low state
H = High state
L-H = Low to high transition
An0 = no change from previous state
Bn0 = no change from previous state
BTL = high and low state are nominally 2.1V and 1.0V, respectively.
TTL = high and low state are nominally 2.4V and 0.5V, respectively.
Package Thermal Characteristics
Linear Feet per
θ
JA (˚C/W)
Minute Air
44-Pin
44-Pin
Flow (LFPM)
PQFP
PLCC
082
45
225
68
35
500
60
30
900
53
26
Note 13: The above values are typical values and are different from the Absolute Maximum Rating values, which include guardbands.
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