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DG444CJ Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # DG444CJ
Description  Improved, Quad, SPST Analog Switches
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DG444CJ Datasheet(HTML) 6 Page - Maxim Integrated Products

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______________________________________________Timing Diagrams/Test Circuits
tOFF
0.8 x VOUT
VOUT
0.8 x VOUT
tf < 20ns
tr < 20ns
50%
0V
0V
+3V
SWITCH
OUTPUT
LOGIC INPUT WAVEFORM IS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
tON
SWITCH
INPUT
LOGIC
INPUT
+3V
IN
+5V
V-
-15V
(
)
RL
CL
VOUT
S
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
GND
REPEAT TEST FOR CHANNELS 2, 3, AND 4.
VOUT = VD
RL
RL + rDS(ON)
LOGIC
INPUT
VL
+15V
V+
D
DG444
DG445
Figure 2. Switching Time
__________Applications Information
General Operation
1. Switches are open when power is off.
2. IN, D, and S should not exceed V+ or V-, even with
the power off.
3. Switch leakage is from each analog switch terminal
to V+ or V-, not to other switch terminals.
Operation with Supply Voltages
Other Than ±15V
Using supply voltages other than ±15V will reduce the
analog signal range. The DG444/DG445 switches oper-
ate with ±4.5V to ±20V bipolar supplies or with a +10V
to +30V single supply; connect V- to 0V when operating
with a single supply. Also, all device types can operate
with unbalanced supplies such as +24V and -5V. VL
must be connected to +5V to be TTL compatible, or to
V+ for CMOS-logic level inputs. The
Typical Operating
Characteristics graphs show typical on-resistance with
±20V, ±15V, ±10V, and ±5V supplies. (Switching times
increase by a factor of two or more for operation at ±5V.)
Overvoltage Protection
Proper power-supply sequencing is recommended
for all CMOS devices. Do not exceed the absolute
maximum ratings because stresses beyond the list-
ed ratings may cause permanent damage to the
devices. Always sequence V+ on first, followed by
VL , V-, and logic inputs. If power-supply sequenc-
ing is not possible, add two small, external signal
diodes in series with supply pins for overvoltage
protection (Figure 1). Adding diodes reduces the
analog signal range to 1V below V+ and 1V above
V-, but low switch resistance and low leakage char-
acteristics are unaffected. Device operation is
unchanged, and the difference between V+ and V-
should not exceed +44V.
Improved, Quad, SPST Analog Switches
6
_______________________________________________________________________________________
_____________________Pin Description
V+
D
V-
S
Vg
Figure 1. Overvoltage Protection Using External Blocking Diodes
2, 15, 10, 7
Positive Supply-Voltage Input—
connected to substrate
V+
13
Logic Supply-Voltage Input
VL
12
Ground
GND
5
Negative Supply-Voltage Input
V-
4
PIN
Source Outputs
S1-S4
3, 14, 11, 6
Drain Outputs
D1-D4
Logic Control Inputs
IN1-IN4
1, 16, 9, 8
FUNCTION
NAME


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