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Maxim > Solutions > Ultrasound
Key Switch Controllers
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| Display |
Title / Parts |
Key Advantages |
| QV PDF |
Low-Charge-Injection, 16-Channel, High-Voltage Analog Switches
MAX14800, MAX14801, MAX14802, MAX14803
| Series Offers Low-Charge Injection, Integrated Overvoltage Protection, Low Capacitance, and Fast SPI Interface |
| QV PDF |
Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface
MAX4800A, MAX4802A
| Series Offers Low Charge Injection, Low Capacitance, and Fast SPI Interface |
| QV PDF |
2-Wire Interfaced Low-EMI Key Switch Controller/GPO
MAX7359
| Low-Voltage, Low-EMI, and Low-Supply Current Key-Switch Controller Monitors Up to 64 Keys Without External Components |
| QV PDF |
2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers
MAX7347, MAX7348, MAX7349
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| Key Specifications:
Keyswitch Controllers |
| Part Number |
Interface |
Max. Keys |
I2C Interface Voltage |
Typ. Supply Current (µA) |
Typ. Shutdown Current (µA) |
INT Output |
Key Scan I2C Slave IDs |
Sounder I2C Slave IDs |
Sounder Output |
GPOs |
ALERT Input |
Supply Voltage (V) |
Package |
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MAX7347
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Serial 2-Wire 400kbit
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24
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2.4 to 5.5
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75
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7.5
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Yes
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4
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4
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Yes
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6 + 1(INT)
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Yes
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2.4 to 3.6
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QSOP/16
TQFN/16
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MAX7348
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Serial 2-Wire 400kbit
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40
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2.4 to 5.5
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75
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7.5
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Yes
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4
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4
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Yes
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3 + 1(INT)
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-
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2.4 to 3.6
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QSOP/20
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MAX7349
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Serial 2-Wire 400kbit
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64
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2.4 to 5.5
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75
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7.5
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Yes
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1
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-
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-
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1 + 1(INT)
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-
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2.4 to 3.6
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QSOP/24
TQFN/24
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| See All Keyswitch Controllers (3) |
| Key Specifications:
Switches and Multiplexers (Low Voltage) |
| Part Number |
Configuration |
Number of Channels |
Normally (Open/Closed) |
VSUPPLY, Single (min) (V) |
VSUPPLY, Single (max) (V) |
VSUPPLY, Dual (min) (±V) |
VSUPPLY, Dual (max) (±V) |
Bandwidth (MHz) |
IL (OFF) (max) (nA) |
tON (max) (nS) |
tOFF (max) (nS) |
CON (pF) |
COFF (pF) |
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MAX4800A
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SPST
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8
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Open
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40
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200
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40
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100
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20
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2000
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5,000
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5,000
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36
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11
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| See All Switches and Multiplexers (Low Voltage) (158) |
| Key Specifications:
Switches and Multiplexers (Mid Voltage) |
| Part Number |
Configuration |
Number of Channels |
Normally (Open/Closed) |
VSUPPLY, Single (min) (V) |
VSUPPLY, Single (max) (V) |
VSUPPLY, Dual (min) (±V) |
VSUPPLY, Dual (max) (±V) |
Bandwidth (MHz) |
IL (OFF) (max) (nA) |
tON (max) (nS) |
tOFF (max) (nS) |
CON (pF) |
COFF (pF) |
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MAX4800A
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SPST
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8
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Open
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40
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200
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40
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100
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20
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2000
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5,000
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5,000
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36
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11
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MAX4802A
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SPST
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8
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Open
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40
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200
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40
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100
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20
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2000
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5,000
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5,000
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36
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11
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| See All Switches and Multiplexers (Mid Voltage) (297) |
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