The MAX4818/MAX4819 high-bandwidth, low-on-resistance analog dual SPDT switches/4:1 multiplexers are designed to serve as integrated T1/E1 protection switches for 1+1 and N+1 line-card redundancy applications. Each MAX4818/MAX4819 replaces four electromechanical relays, significantly reducing board space, simplifying PC board routing, and reducing power consumption. These devices operate with ±3.3V or ±5V dual supplies for applications requiring T1/E1 signal switching in the line side of the interface transformer. Internal voltage multipliers drive the analog switches, yielding excellent linearity and low 4Ω typical on-resistance within the T1/E1 analog signal range. This high-bandwidth family of products is optimized for low return loss and matched pulse template performance in T1/E1 long-haul and short-haul applications. The MAX4818/MAX4819 are available in a tiny 16-pin, 5mm x 5mm, thin QFN package and are specified over the extended -40°C to +85°C temperature range. Applications * Add/Drop Multiplexers * Avionics * Base Stations and Base-Station Controllers * Data Acquisition * Digital Loop Carriers * Edge Routers * Industrial Applications * Multi-Service Provisioning Platforms * Multi-Service-Switches (MSSs) * T1/E1 Redundancy Switching * Telecom Signal Switching * Test Equipment * Dual SPDT and 4:1 Multiplexer Configurations * Dual-Supply Operation from ±3.3V to ±5V * Single-Supply Operation from +6V to +11V * Hot-Insertion Tolerant with No DC Path to the Supplies * Low On-Resistance, RON = 4Ω (typ) and 6Ω (max) * Over 350MHz -3dB Signal Bandwidth (MAX4818) * Excellent Crosstalk and Off-Isolation Performance Over the T1/E1 Signal Spectrum: Over 110dB Crosstalk Attenuation at 1MHz (MAX4818) * Low Current Consumption of 2mA (max) * -40°C to +85°C Extended Temperature Range * Space-Saving, 16-Pin, 5mm x 5mm Thin QFN * SET Controls All Switches Simultaneously For Redundancy Switching (MAX4819)