Improved, Quad, SPST Analog Switches
DG441/DG442
_____________________Pin Description
PIN
NAME
FUNCTION
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, followed by V- and logic
inputs. If power-supply sequencing is not possible, add
two small, external signal diodes in series with supply
pins for overvoltage protection (Figure 1). Adding exter-
nal diodes reduces the analog-signal range to 1V
below V+ and 1V above V-, but low switch resistance
and low leakage characteristics are unaffected. Device
operation is unchanged, and the difference between
V+ and V- should not exceed +44V.
1, 16, 9, 8 IN1–IN4 Input
2, 15, 10, 7 D1–D4
3, 14, 11, 6
4
5
12
13
S1–S4
V-
GND
N.C.
V+
Drain Output
Source Output
Negative Supply Voltage Input
Ground
Not Internally Connected
Positive Supply Voltage Input.
Connected to substrate.
V+
__________Applications Information
Operation with Supply Voltages
Other Than ±15V
Using supply voltages other than ±15V reduces the
analog signal range. The DG441/DG442 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. The
Typical Operating Characteristics
graphs show typical
on-resistance with ±20V, ±15V, ±10V, and ±5V sup-
plies. (Switching times increase by a factor of two or
more for operation at ±5V.)
D
S
Vg
V-
Figure 1. Overvoltage Protection Using External Blocking Diodes
6
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