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PDF MAX322 Data sheet ( Hoja de datos )
| Número de pieza | MAX322 | |
| Descripción | Precision / Dual-Supply / SPST Analog Switches | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0350; Rev 0; 12/94
Precision, Dual-Supply, SPST
Analog Switches
_______________General Description
The MAX320/MAX321/MAX322 are precision, dual,
SPST analog switches designed to operate from ±3V to
±8V dual supplies. The MAX320 has two normally open
(NO) switches and the MAX321 has two normally
closed (NC) switches. The MAX322 has one NO and
one NC switch. Low power consumption (1.25mW)
makes these parts ideal for battery-powered equip-
ment. They offer low leakage currents (100pA max) and
fast switching speeds (tON = 150ns max, tOFF = 100ns
max).
The MAX320 series, powered from ±5V supplies, offers
35Ω max on-resistance (RON), 2Ω max matching
between channels, and 4Ω max RON flatness.
These switches also offer 5pC max charge injection
and a minimum of 2000V ESD protection per Method
3015.7.
For equivalent devices specified for single-supply oper-
ation, see the MAX323/MAX324/MAX325 data sheet.
For quad versions of these switches, see the
MAX391/MAX392/MAX393 data sheet.
________________________Applications
Battery-Operated Systems
Heads-Up Displays
Audio and Video Switching
Test Equipment
±5V DACs and ADCs
Sample-and-Hold Circuits
Guidance and Control Systems
Military Radios
Communications Systems
PBX, PABX
____________________________Features
o Low On-Resistance, 35Ω max (16Ω typical)
o RON Matching Between Channels <2Ω
o RON Flatness <4Ω
o Guaranteed Charge Injection <5pC
o Bipolar Supply Operation (±3V to ±8V)
o Low Power Consumption, <1.25mW
o Low Leakage Current Over Temperature,
<2.5nA at +85°C
o Fast Switching, tON <150ns, tOFF <100ns
o Guaranteed Break-Before-Make (MAX322 only)
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX320CPA
0°C to +70°C
8 Plastic DIP
MAX320CSA
0°C to +70°C
8 SO
MAX320CUA
0°C to +70°C
8 µMAX
MAX320C/D
0°C to +70°C
Dice*
MAX320EPA
-40°C to +85°C
8 Plastic DIP
MAX320ESA
-40°C to +85°C
8 SO
MAX320EJA
-40°C to +85°C
8 CERDIP**
MAX320MJA
-55°C to +125°C 8 CERDIP**
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
** Contact factory for availability.
_____________________Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX320
MAX321
MAX322
NO1 1
COM1 2
IN2 3
V- 4
8 V+
7 IN1
6 COM2
5 NO2
NC1 1
COM1 2
IN2 3
V- 4
8 V+
7 IN1
6 COM2
5 NC2
DIP/SO/µMAX
MAX320
LOGIC
SWITCH
0 OFF
1 ON
DIP/SO/µMAX
MAX321
LOGIC
SWITCH
0 ON
1 OFF
SWITCHES SHOWN FOR LOGIC "0" INPUT
NO1 1
COM1 2
IN2 3
V- 4
8 V+
7 IN1
6 COM2
5 NC2
DIP/SO/µMAX
LOGIC
0
1
MAX322
SWITCH 1
OFF
ON
SWITCH 2
ON
OFF
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
Precision, Dual-Supply, SPST
Analog Switches
_____________________Pin Description
PIN NAME
NO1
(MAX320/MAX322)
1
NC1
(MAX321)
2, 6 COM1, COM2
3, 7 IN2, IN1
4 V-
NO2
(MAX320)
5
NC2
(MAX321/MAX322)
8 V+
FUNCTION
Normally Open Analog
Switch Terminal
Normally Closed Analog
Switch Terminal
Analog Switch Common
Terminals
Logic Inputs
Negative Supply
Normally Open Analog
Switch Terminal
Normally Closed Analog
Switch Terminal
Positive Supply
POSITIVE SUPPLY
D1
V+
NO
Vg
COM
V-
D2
NEGATIVE SUPPLY
MAX320
MAX321
MAX322
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
__________Applications Information
Logic Levels
Calculate the logic thresholds typically as follows: VIH =
(V+ - 1.5V) and VIL = (V+ - 2.5V).
Power-supply consumption is minimized when IN1 and
IN2 are driven with logic-high levels equal to V+ and logic-
low levels well below the calculated VIL of (V+ - 2.5V). IN1
and IN2 can be driven to V- without damage.
Analog Signal Levels
Analog signals that range over the entire supply voltage
(V- to V+) can be switched, with very little change in on-
resistance over the entire voltage range (see Typical
Operating Characteristics). All switches are bidirec-
tional, so NO_, NC_, and COM_ pins can be used as
either inputs or outputs.
Power-Supply Sequencing
and Overvoltage Protection
Do not exceed the absolute maximum ratings, because
stresses beyond the listed ratings may cause perma-
nent damage to the devices.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+, followed by V-,
before applying analog signals or logic inputs, especial-
ly if the analog or logic signals are not current-limited. If
this sequencing is not possible, and if the analog or
logic inputs are not current-limited to <30mA, add two
small signal diodes (D1, D2) as shown in Figure 1.
Adding protection diodes reduces the analog signal
range to a diode drop (about 0.7V) below V+ for D1,
and a diode drop above V- for D2. Leakage is not
affected by adding the diodes. On-resistance increas-
es by a small amount at low supply voltages. Maximum
supply voltage (V- to V+) must not exceed 17V.
Adding protection diode D1 causes the logic thresh-
olds to be shifted relative to the positive power-supply
rail. This can be significant when low positive supply
voltages (+5V or less) are used. Driving IN1 and IN2 all
the way to the supply rails (i.e., to a diode drop higher
than the V+ pin or a diode drop lower than the V- pin) is
always acceptable.
The protection diodes D1 and D2 also protect against
some overvoltage situations. With the circuit of Figure 1,
if the supply voltage is below the absolute maximum
rating and if a fault voltage up to the absolute maximum
rating is applied to an analog signal pin, no damage
will result. For example, with ±5V supplies, analog sig-
nals up to ±8.5V will not damage the circuit of Figure 1.
If only a single fault signal is present, the fault voltage
can rise to +12V or to -12V without damage.
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX322.PDF ] | |
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