MAX378, MAX379 8通道、高电压、故障保护多路复用器

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The MAX378 8-channel single-ended (1-of-8) multiplexer and the MAX379 4-channel differential (2-of-8) multiplexer use a series N-channel/P-channel/N-channel structure to provide significant fault protection. If the power supplies to the MAX378/MAX379 are inadvertently turned off while input voltages are still applied, all channels in the muxes are turned off, and only a few nanoamperes of leakage current will flow into the inputs. This protects not only the MAX378/MAX379 and the circuitry they drive, but also the sensors or signal sources that drive the muxes.

The series N-channel/P-channel/N-channel protection structure has two significant advantages over the simple current-limiting protection scheme of the industry's first-generation fault-protected muxes. First, the Maxim protection scheme limits fault currents to nanoamp leakage values rather than many milliamperes. This prevents damage to sensors or other sensitive signal sources. Second, the MAX378/MAX379 fault-protected muxes can withstand a continuous±60V input, unlike the first generation, which had a continuous ±35V input limitation imposed by power dissipation considerations.

All digital inputs have logic thresholds of 0.8V and 2.4V, ensuring both TTL and CMOS compatibility without requiring pull-up resistors. Break-before-make operation is guaranteed. Power dissipation is less than 2mW.

关键特性

应用/使用

Fault Input Voltage ±75V with Power Supplies Off
Fault Input Voltage ±60V with ±15V Power Supplies
All Switches Off with Power Supplies Off
On Channel Turns OFF if Overvoltage Occurs on Input or Output
Only Nanoamperes of Input Current Under All Fault Conditions
No Increase in Supply Currents Due to Fault Conditions
Latchup-Proof Construction
Operates from ±4.5V to ±18V Supplies
All Digital Inputs are TTL and CMOS Compatible
Low-Power Monolithic CMOS Design

	航空电子测试设备
	数据采集
	工业与过程控制系统
	系统间的信号路由

Key Specifications: Switches and Multiplexers (Mid Voltage)

Part Number

Configuration

Number of Channels

V_SUPPLY, Dual (min) (±V)

V_SUPPLY, Dual (max) (±V)

R_ON (max) (Ω)

I_{L (OFF)} (max) (nA)

t_ON (max) (nS)

t_OFF (max) (nS)

C_ON (pF)

C_OFF (pF)

Features

V_ISO, Off-Isolation (dB)

Fault Protection (±V)

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX378

8:1 Mux

4.5

3500

1,000

500

•	Chip Enable

Yes

MIL-STD-883B

Ceramic DIP/16
DICE SALES/0
LCC/20
PDIP/16
SOIC/24

$3.50 @ 1k

MAX379

4:1 Mux

Ceramic DIP/16
LCC/20
PDIP/16
SOIC/24

$3.50 @ 1k

See All Switches and Multiplexers (Mid Voltage) (284)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.