HCF4066B Datasheet, PDF (2/9 Pages) STMicroelectronics – QUAD BILATERAL SWITCH FOR TRANSMISSION OR MULTIPLEXING OF ANALOG OR DIGITAL SIGNALS

HCF4066B
the ON resistance is relatively constant over the
full input signal range. The HCF4066B consists of
four independent bilateral switches. A single
control signal is required per switch. Both the p
and n device in a given switch are biased ON or
OFF simultaneously by the control signal. As
shown in schematic diagram , the well of the
n-channel device on each switch is either tied to
the input when the switch is ON or to V_SS when
the switch is OFF. This configuration eliminates
INPUT EQUIVALENT CIRCUIT
the variation of the switch-transistor threshold
voltage with input signal, and thus keeps the ON
resistance low over the full operating signal range.
The advantages over single channel switches
include peak input signal voltage swings equal to
the full supply voltage, and more constant ON
impedance over the input signal range. For
sample and hold applications, however, the
HCF4016B is recommended.
PIN DESCRIPTION
PIN No
1, 4, 8, 11
2, 3, 9, 10
13, 5, 6, 12
7
14
SYMBOL NAME AND FUNCTION
A to D I/O
A to D O/I
CONTROL
A to D
V_SS
V_DD
Independent Inputs/Out-
puts
Independent Outputs/
Inputs
Enable Inputs
Negative Supply Voltage
Positive Supply Voltage
TRUTH TABLE
CONTROL
H
L
SWITCH FUNCTION
ON
OFF
SCHEMATIC DIAGRAM (1 OF 4 IDENTICAL SWITCHES AND ITS ASSOCIATED CONTROL
CIRCUITY)
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