dg421dy Maxim Integrated Products, Inc., dg421dy Datasheet - Page 5

• Manufacturer Part Number: dg421dy
• Description: Improved Low-power, Cmos Analog Switches With Latches Integrated Products
• Manufacturer: Maxim Integrated Products, Inc.

16, 9, 4, 5 20, 12, 5, 7
___________________Pin Descriptions
3, 4, 5, 6
1, 8, 3, 6
10, 15
15, 10
9, 16
PIN
1, 8
DIP
11
12
13
14
11
12
14
13
—
2
7
2
7
1, 6, 11, 16
2, 10, 4, 8
IN1, IN2
D1, D2
NAME
S1, S2
PLCC
19, 13
GND
N.C.
–
W
–
R
V+
V
14
15
18
17
– — –
V-
– — –
3
9
S
R
L
–
–
_______________________________________________________________________________________
DG423/DG425
Drain Terminals
Write Select
No Internal Connection
Reset Select
Source Terminals
Input Control
Positive Supply
Logic Supply
Ground
Negative Supply
IN1, IN2
NAME
D1-D4
DG421
S1-S4
GND
N.C.
–
W
–
R
V+
CMOS Analog Switches with Latches
V
V-
– — –
– — –
S
L
R
–
–
FUNCTION
Drain Terminals
Write Select
Source Terminals
Resets Select
Input Control
Positive Supply
Logic Supply
No Internal Connection
Negative Supply
Ground
FUNCTION
The DG421/DG423/DG425 switches operate with ±4.5V
to ±20V bipolar supplies or with a +10V to +30V single
supply. In either case, analog signals ranging from V+
to V- can be switched. The Typical Operating
Characteristics graphs illustrate typical analog-signal
and supply-voltage on-resistance variations. The usual
on-resistance temperature coefficient is 0.5%/°C (typ).
These devices operate with a single positive supply or
with bipolar supplies. They maintain TTL compatibility
with supplies anywhere in the ±4.5V to ±20V range as
long as V
supply at voltages other than +5V, the devices will
operate at CMOS-logic-level inputs.
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 may cause permanent damage to the devices.
Always sequence V+ on first, followed by V
logic inputs. If power-supply sequencing is not possi-
ble, 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-, without affecting low switch
resistance and low leakage characteristics. Device
operation is unchanged, and the difference between V+
and V- should not exceed +44V.
Figure 1. Overvoltage Protection Using External Blocking Diodes
__________Applications Information
Improved Low-Power,
V
g
L
= +5V. If V
Operation with Supply Voltages
S
L
is connected to V+ or another
Overvoltage Protection
V+
V-
Other Than ±15V
D
Logic Inputs
L
, V-, and
5