DG423DN Datasheet PDF - Maxim Integrated
| Part Number | DG423DN | |
| Description | Improved Low-Power / CMOS Analog Switches with Latches | |
| Manufacturers | Maxim Integrated | |
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19-0137; Rev 1; 3/94
Improved Low-Power,
CMOS Analog Switches with Latches
_______________General Description
Maxim’s redesigned DG421/DG423/DG425 monolithic
analog switches now feature guaranteed on-resistance
matching (3Ω max) between switches and on-resistance
flatness over the signal range (4Ω max). These low on-
resistance switches (20Ω typ) conduct equally well in both
directions. They guarantee a low charge injection of 15pC
maximum and an ESD tolerance of 2000V minimum per
Method 3015.7. Off leakage current over temperature has
also been reduced (less than 5nA at +85°C).
The DG421/DG423/DG425 are precision, dual CMOS
switches with latchable logic inputs that simplify inter-
facing with microprocessors (µPs). The single-pole/single-
throw DG421 and double-pole/single-throw DG425 are
normally open dual switches. The dual, single-
pole/double-throw DG423 has two normally open and
two normally closed switches. Fast switching times
(175ns for tON and 145ns for tOFF) and low power
consumption (35µW max) make these parts ideal for
battery-powered applications requiring µP-compatible
switches. Operation is from a single +10V to +30V supply,
or bipolar ±4.5V to ±20V supplies. Fabricated with the
same 44V silicon-gate process, these switches have
rail-to-rail signal handling capabilities.
_______________________Applications
Sample-and-Hold Circuits
Fax Machines
Battery-Operated Systems
Guidance and Control Systems
Audio Signal Routing
Modems
Test Equipment
PBX, PABX
Military Radios
Communication Systems
__Functional Diagrams/Truth Tables
______________________New Features
o Plug-In Upgrades for Industry-Standard
DG421/DG423/DG425
o Improved r(DS)ON Match Between Channels (3Ω max)
o Guaranteed rFLAT(ON) Over Signal Range (4Ω max)
o Improved Charge Injection (15pC max)
o Improved Off Leakage Current Over Temperature
(<5nA at +85°C)
o Withstands Electrostatic Discharge (2000V min)
per Method 3015.7
__________________Existing Features
o Low rDS(ON) (35Ω max)
o Single-Supply Operation +10V to +30V
Bipolar-Supply Operation ±4.5V to ±20V
o Low Power Consumption (35µW max)
o Rail-to-Rail Signal Handling Capability
o TTL/CMOS-Logic Compatible
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
DG421CJ
0°C to +70°C
16 Plastic DIP
DG421CY
0°C to +70°C
16 SO
DG421C/D
0°C to +70°C
Dice*
DG421DJ
-40°C to +85°C
16 Plastic DIP
DG421DY
-40°C to +85°C
16 SO
DG421DK
-40°C to +85°C
16 CERDIP
DG421AK
-55°C to +125°C
16 CERDIP**
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883B.
_________________Pin Configurations
S1 D1
WR
IN1 CK
DQ
R
IN2 CK
DQ
RS R
S2
DG421
D2
TWO SPST SWITCHES
PER PACKAGE
DG421 TRUTH TABLE
WR RS IN SWITCH
0
0 11
Off
On
LOGIC "O" ≤ 0.8V
LOGIC "1" ≥ 2.4V
SWITCHES SHOWN FOR
LOGIC "1" INPUT
Functional Diagrams/Truth Tables continued at end of data sheet.
TOP VIEW
D1 1
WR 2
N.C. 3
N.C. 4
N.C. 5
N.C. 6
RS 7
D2 8
DG421
16 S1
15 IN1
14 V-
13 GND
12 VL
11 V+
10 IN2
9 S2
N.C. = No Internal Connection
DIP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
|
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Improved Low-Power,
CMOS Analog Switches with Latches
___________________Pin Descriptions
DG421
PIN NAME
FUNCTION
1, 8 D1, D2 Drain Terminals
2 W––—–R– Write Select
3, 4, 5, 6
7
N.C.
–R–—–S–
No Internal Connection
Reset Select
9, 16
S1, S2 Source Terminals
10, 15 IN1, IN2 Input Control
11 V+ Positive Supply
12 VL Logic Supply
13
GND
Ground
14 V- Negative Supply
DG423/DG425
DIP
PLCC
NAME
FUNCTION
1, 8, 3, 6 2, 10, 4, 8
23
D1-D4
–W–—R––
Drain Terminals
Write Select
16, 9, 4, 5 20, 12, 5, 7
79
S1-S4
–R–—S––
Source Terminals
Resets Select
15, 10
19, 13
IN1, IN2 Input Control
11 14 V+ Positive Supply
12 15
VL Logic Supply
— 1, 6, 11, 16 N.C. No Internal Connection
14 18
V- Negative Supply
13 17 GND Ground
__________Applications Information
Operation with Supply Voltages
Other Than ±15V
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).
Logic Inputs
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 VL = +5V. If VL is connected to V+ or another
supply at voltages other than +5V, the devices will
operate at CMOS-logic-level inputs.
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 may cause permanent damage to the devices.
Always sequence V+ on first, followed by VL, V-, and
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.
V+
S
Vg
D
V-
Figure 1. Overvoltage Protection Using External Blocking Diodes
_______________________________________________________________________________________ 5
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| Information | Total 12 Pages | |
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| Download | [ DG423DN.PDF Datasheet ] | |
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