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Part: DG425C/D
Category:
Analog & Mixed-Signal Processing
-> Switches & Multiplexers
-> Analog Switches
Description: DG421, DG423, DG425 Improved Low-Power, CMOS Analog Switches With Latches
Company: Maxim Integrated Products
Datasheet: Download DG425C/D datasheet File size : 304 kB
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Datasheet text preview:
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 (3 max) between switches and on-resistance flatness over the signal range (4 max). These low onresistance switches (20 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 interfacing with microprocessors (µPs). The single-pole/singlethrow DG421 and double-pole/single-throw DG425 are n o r m a l l y open dual switches. The dual, singlepole/double-throw DG423 has two normally open and t w o normally closed switches. Fast switching times ( 1 7 5 n s for t O N a n d 145ns for t O F F ) 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.
______________________New Features
o Plug-In Upgrades for Industry-Standard DG421/DG423/DG425 o Improved r(DS)ON Match Between Channels (3 max) o Guaranteed rFLAT(ON) Over Signal Range (4 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
DG421/DG423/DG425
__________________Existing Features
o Low rDS(ON) (35 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 DG421CJ DG421CY DG421C/D DG421DJ DG421DY DG421DK DG421AK TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 SO Dice* 16 Plastic DIP 16 SO 16 CERDIP 16 CERDIP**
_______________________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
Ordering Information continued at end of data sheet. * Contact factory for dice specifications. ** Contact factory for availability and processing to MIL-STD-883B.
__Functional Diagrams/Truth Tables
S1 WR IN1 D IN2 D RS S2 CK R Q D2 CK R Q D G 4 2 1 TRUTH TABLE WR RS IN SWITCH D1
_________________Pin Configurations
T O P VIEW
D1 1 WR 2 N.C. 3 N.C. 4 N.C. 5 N.C. 6 RS 7 D2 8 16 S1 1 5 IN1 14 V-
DG421
13 GND 12 VL 11 V+ 10 IN2 9 S2
DG421
0
1
0 1
Off On
L O G I C "O" 0.8V L O G I C "1" 2.4V S W I T C H E S SHOWN FOR L O G I C "1" INPUT
T W O SPST SWITCHES P E R PACKAGE
Functional Diagrams/Truth Tables continued at end of data sheet.
DIP N.C. = No Internal Connection Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
Improved Low-Power, CMOS Analog Switches with Latches DG421/DG423/DG425
ABSOLUTE MAXIMUM RATINGS
Voltage Referenced to VV+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44V GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V VL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (GND - 0.3V) to (V+ + 0.3V) Digital Inputs, VS, VD (Note 1) . . . . . . . . . . . . . . (V- - 2V) to (V+ + 2V) Current (any terminal, except S or D) .........30mA Continuous Current, S or D .......20mA Peak Current, S or D (pulsed at 1ms, 10% duty cycle max)...100mA Continuous Power Dissipation (TA = +70°C) 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) . . . 842mW 20-Pin PLCC (derate 10.00mW/°C above +70°C) . . . . . 800mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C) . . . 800mW Operating Temperature Ranges DG42_C_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C DG42_D_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C DG42_A_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C Storage Temperature Ranges DG42_C_/DG42_D_ . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +125°C DG42_A_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (soldering, 10sec). . . . . . . . . . . . . . . . . . . . +300°C
Note 1: Signals on S, D, or IN exceeding V+ or V- are clamped by internal diodes. Limit forward current to maximum current ratings.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V- = -15V, VL = +5V, GND = 0V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SWITCH Analog Signal Range Drain-Source On-Resistance VANALOG (Note 3) V+ = 13.5V, V- = -13.5V, IS = -10mA, VD = ±10V V+ = 16.5V, V- = -16.5V, IS = -10mA, VD = ±10V V+ = 15V, V- = -15V, IS = -10mA, VD = ±5V V+ = 16.5V, V- = -16.5V, VD = ±15.5V, VS = m 15.5V V+ = 16.5V, V- = -16.5V, VD = ±15.5V, VS = m 15.5V V+ = 16.5V, V- = -16.5V, VD = ±15.5V, VS = ±15.5V TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX -0.50 -0.01 -5 -0.50 -0.01 -5 -1.0 -10 -0.04 -15 20 15 45 45 3 4 4 5 0.50 5 0.50 5 1.0 10 -0.25 -0.01 -10 -0.25 -0.01 -10 -0.40 -0.04 -20 -15 20 15 35 45 3 4 4 5 0.25 nA 10 0.25 nA 10 0.40 nA 20 V SYMBOL CONDITIONS DG42_C, DG42_D MIN TYP MAX (Note 2) MIN DG42_A TYP MAX (Note 2) UNITS
rDS(ON)
On-Resistance Match Between Channels (Note 4)
rDS(ON)
On-Resistance Flatness (Note 4)
rFLAT(ON)
Source-Off Leakage Current (Note 5) Drain-Off Leakage Current (Note 5) Drain-On Leakage Current (Note 5) 2
IS(OFF)
ID(OFF)
ID(ON)
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Improved Low-Power, CMOS Analog Switches with Latches
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V- = -15V, VL = +5V, GND = 0V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER INPUT Input Current with Input Voltage High Input Current with Input Voltage Low SUPPLY Power Supply Range Positive Supply Current SYMBOL CONDITIONS MIN TYP MAX (Note 2) 0.005 0.005 0.50 0.50 ±20 0.01 1.0 µA -5.0 -1.0 -5.0 -1.0 -5.0 -1.0 -5.0 150 -0.01 -0.01 -0.01 5.0 1.0 µA 5.0 1.0 µA 5.0 1.0 µA 5.0 250 300 200 UNITS
DG421/DG423/DG425
IINH IINL V+, VI+
IN = 2.4V, all others = 0.8V IN = 0.8V, all others = 2.4V (Note 3) All channels on or off, V+ = 16.5V, V- = -16.5V, VIN = 0V or 5V All channels on or off, V+ = 16.5V, V- = -16.5V, VIN = 0V or 5V All channels on or off, V+ = 16.5V, V- = -16.5V, VIN = 0V or 5V All channels on or off, V+ = 16.5V, V- = -16.5V, VIN = 0V or 5V
-0.50 -0.50 ±4.5 TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = -55°C to +125°C TA = +25°C TA = -55°C to +125°C TA = +25°C TA = -55°C to +125°C TA = +25°C TA = +25°C TA = +25°C TA = +25°C TA = +25°C TA = +25°C TA = +25°C TA = +25°C 200 200 100 100 60 100 5 -1.0
µA µA V
Negative Supply Current
I-
Logic Supply Current
IL
Ground Current DYNAMIC Turn-On Time Turn-Off Time
IGND
tON tOFF tWW
Figure 2 Figure 2 VS = ±10V, RL = 300, CL = 35pF, Figure 3 DG423, Figure 4 CL = 10nF, VG = 0V, RG = 0, Figure 5 RL = 100, CL = 5pF, f = 1MHz, Figure 6 RL = 50, CL = 5pF, f = 1MHz, Figure 7
ns ns
Latch Timing
tDW tWD
ns
Break-Before-Make Interval (Note 3) Charge Injection (Note 3) Off-Isolation Rejection Ratio (Note 6) Crosstalk (Note 7) Drain-Off Capacitance Source-Off Capacitance Drain-On Capacitance Source-On Capacitance
tD Q OIRR
25 10 72 90 12 12 39 39 15
ns pC dB dB pF pF pF pF
CD(OFF) CS(OFF) CD(ON) CS(ON)
f = 1MHz, Figure 8 f = 1MHz, Figure 8 f = 1MHz, Figure 9 f = 1MHz, Figure 9
Note 2: Typical values are for design aid only, are not guaranteed, and are not subject to production testing. The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet. Note 3: Guaranteed by design. Note 4: On-resistance match between channels and flatness are guaranteed only with bipolar-supply operation. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured at the extremes of the specified analog signal range. Note 5: Leakage parameters IS(OFF), ID(OFF), and ID(ON) are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C. Note 6: Off-Isolation Rejection Ratio = 20log (VD/VS), VD = output, VS = input to off switch. Note 7: Between any two switches.
_______________________________________________________________________________________
3
Improved Low-Power, CMOS Analog Switches with Latches DG421/DG423/DG425
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
ON-( ESISTANCE vs. VD R DUAL-SUPPLIES)
MAX401-1
T ON-RESISTANCE vs. VD AND EMPERATURE (DUAL SUPPLIES)
MAX401-2
ON-RESISTANCE vs. VD ( SINGLE SUPPLY)
V- = 0V 120 100 rDS (ON) () 80 60 V+ = 10V 40
MAX401-3
55 50 45 40 rDS (ON) () 35 30 25 20 15 10 5
A: B: C: D:
V+ = 5V, V- = -5V V+ = 10V, V- = -10V V+ = 15V, V- = -15V V+ = 20V, V- = -20V
35 30 25 rDS (ON) () 20 15 TA = -55°C TA = +125°C TA = +85°C TA = +25°C
140
A
V+ = 5V
B C D
10 V+ = 15V, V- = -15V 5 -20 -10 0 VD (V) 10 20 -20 -10 0 VD (V) 10 20
V+ = 15V 0 5 10 VD (V) 15
V+ = 20V 20
20
ON-RESISTANCE vs. VD AND TEMPERATURE (SINGLE SUPPLY)
MAX401-4
OFF LEAKAGE CURRENTS vs. TEMPERATURE
V+ = 16.5V V- = -16.5V VD = ±15V VS = ±15V
MAX401-5
ON LEAKAGE CURRENTS vs. TEMPERATURE
V+ = 16.5V V- = -16.5V VD = ±15V VS = ±15V
MAX401-6
70 60 TA = +125°C
100 10 OFF LEAKAGE (nA) 1 0.1 0.01
100 10 ON LEAKAGE (nA) 1 0.1 0.01
50 rDS (ON) () 40 30 20 V+ = 12V, V- = 0V 10 0 5 10 VD (V)
TA = +85°C TA = +25°C
0.001 0.0001 15 20 -75 25 TEMPERATURE (°C) 125
0.001 0.0001 -75 25 TEMPERATURE (°C) 125
CHARGE INJECTION vs. ANALOG VOLTAGE
MAX401-7
SUPPLY CURRENT vs. TEMPERATURE
MAX401-8
60 40 20 Q (pC) 0 -20 -40 V+ = 15V, V- = -15V -60 -20 -10 0 VD (V) 10
100 10 1 0.1 0.01 0.001 0.0001
I+, I-, IL (µA)
I+ at V+ = 16.5V I- at V- = -16.5V IL at VL = 5V
20
-75
25 TEMPERATURE (°C)
125
4
_______________________________________________________________________________________
Improved Low-Power, CMOS Analog Switches with Latches
___________________Pin Descriptions
DG421 PIN 1, 8 2 3, 4, 5, 6 7 9, 16 10, 15 11 12 13 14 NAME D1, D2 -- WR N.C. -- RS S1, S2 IN1, IN2 V+ VL GND VFUNCTION Drain Terminals Write Select No Internal Connection Reset Select Source Terminals Input Control Positive Supply Logic Supply Ground Negative Supply DG423/DG425 DIP 1, 8, 3, 6 2 PLCC 2, 10, 4, 8 3 NAME D1-D4 -- WR S1-S4 -- RS IN1, IN2 V+ VL N.C. VGND FUNCTION Drain Terminals Write Select Source Terminals Resets Select Input Control Positive Supply Logic Supply No Internal Connection Negative Supply Ground
V+
__________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+ t o 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).
DG421/DG423/DG425
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 s u p p l y 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 maximum ratings because stresses beyond the listed ratings 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 possible, add two small, external signal diodes in series with s u p p l y 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.
16, 9, 4, 5 20, 12, 5, 7 7 15, 10 11 12 -- 14 13 9 19, 13 14 15 1, 6, 11, 16 18 17
S
D
Vg
V-
Figure 1. Overvoltage Protection Using External Blocking Diodes
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