SN74CBTU4411_16 Datasheet, PDF (12/21 Pages) Texas Instruments – Multiplexer/Demultiplexer

SN74CBTU4411
SCDS192A – APRIL 2005 – REVISED FEBRUARY 2016
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8.3 Feature Description
The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. The EN and TC inputs
determine the internal termination for S0 and S1 inputs. When EN is low, the termination is determined by the TC
input. When both EN and TC are low, termination resistors are disconnected from the S inputs. When EN is low
and TC is high, both pullup and pulldown resistors are connected to the S inputs. When EN is high, only the
pulldown termination resistors are connected to the S inputs, regardless of the voltage level at the TC input.
8.4 Device Functional Modes
Table 1 and Table 2 lists the functional modes of the SN74CBTU4411.
Table 1. Function Table
INPUTS
EN DQS_EN S1
S0
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
INPUT/OUTPUT
Hn
0Dn
1Dn
2Dn
3Dn
0Dn
L
H
L
H
1Dn
L
H
H
L
2Dn
L
H
H
H
3Dn
H
L
X
X
Z
H
H
X
X
Z
FUNCTION
Hn = 0Dn
1Dn, 2Dn, 3Dn connected to V_BIAS
Hn = 1Dn
0Dn, 2Dn, 3Dn connected to V_BIAS
Hn = 2Dn
0Dn, 1Dn, 3Dn connected to V_BIAS
Hn = 3Dn
0Dn, 1Dn, 2Dn connected to V_BIAS
H0–H9 = 0D0–0D9
1D0–1D9, 2D0–2D9, 3D0–3D9 connected to V_BIAS
H10 = 0D10
1D10, 2D10, 3D10 connected to V_{BIAS_DQS(1)}
H0–H9 = 1D0–1D9
0D0–0D9, 2D0–2D9, 3D0–3D9 connected to V_BIAS
H10 = 1D10
0D10, 2D10, 3D10 connected to V_{BIAS_DQS(1)}
H0–H9 = 2D0–2D9
0D0–0D9, 1D0–1D9, 3D0–3D9 connected to V_BIAS
H10 = 2D10
0D10, 1D10, 3D10 connected to V_{BIAS_DQS(1)}
H0–H9 = 3D0–3D9
0D0–0D9, 1D0–1D9, 2D0–2D9 connected to V_BIAS
H10 = 3D10
0D10, 1D10, 2D10 connected to V_{BIAS_DQS(1)}
0Dn, 1Dn, 2Dn, 3Dn connected to V_BIAS
0D0–0D9, 1D0–1D9, 2D0–2D9, 3D0–3D9 connected to V_BIAS
0D10, 1D10, 2D10, 3D10 connected to V_DD
(1) V_{BIAS_DQS} is an internal voltage condition.
Table 2. Function Table Continued
INPUTS
EN
TC
L
L
L
H
H
X
FUNCTION
Termination resistors disconnected from S inputs
Termination resistors connected with S inputs
Pulldown termination resistor connected and pullup
termination resistor disconnected from the S inputs
12
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