SN74CBTU4411_16 Datasheet, PDF (11/21 Pages) Texas Instruments – Multiplexer/Demultiplexer

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8 Detailed Description
SN74CBTU4411
SCDS192A – APRIL 2005 – REVISED FEBRUARY 2016
8.1 Overview
The SN74CBTU4411 device is organized as an 11-bit 1-of-4 multiplexer/demultiplexer with a single switch-
enable (EN) input. When EN is low, the switch is enabled and the H port is connected to one of the D ports.
Ports D0 to D9 for the disabled channels are connected to V_BIAS through a 400-Ω resistor. DQS_EN determines
the output voltage for the disabled D10 ports. When DQS_EN is low, this voltage is V_BIAS. When DQS_EN is
high, the disabled D10 ports are connected to an internal voltage (V_{BIAS_DQS}) source, which is approximately
equal to 0.7 V_DD.
When EN is high, all the channels are disabled. Ports D0 to D9 are connected to V_BIAS. For the D10 port, the
disabled output voltage is determined by the DQS_EN input. When DQS_EN is low, this voltage is V_BIAS. When
DQS_EN is high, this voltage is V_DD
8.2 Functional Block Diagram
D1
VBIAS
B5
H0
SW1
SW1
SW1
SW1
A4
0D0
A5
1D0
A6
2D0
B6
3D0
F2
H10
SW2
SW2
SW2
SW2
G1
0D10
F1
1D10
E1
2D10
E2
3D10
C2
EN
B1
TC
S0 ^B2
VDD
M1
(see Note A)
r1
VREF
CONTROL DECODE
LOGIC
r2
(see Note A)
M2 _VDD
A1
S1
M1
(see Note A)
r1
r2
(see Note A)
M2
A2
DQS_EN
A. r₁ + r_on (M1), r₂ + r_on(M2) = 160 Ω typical
Figure 4. Logic Diagram (Positive Logic)
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