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19-3915; Rev 1; 1/07
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes
General Description
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.
Features
♦ 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)
MAX4818/MAX4819
Applications
T1/E1 Redundancy Switching Base Stations and Base-Station Controllers Add and Drop Multiplexers
Pin Configurations
NC1 V+ TOP VIEW NC2 9 N.C. 10
Multi-Service Provisioning Platforms Edge Routers Multi-Service-Switches (MSSs) Digital Loop Carriers Industrial Applications Data Acquisition Telecom Signal Switching Test Equipment Avionics
12
11
COM1
IN1 SET N.C.
13 14
8 7
COM2 IN2 EN N.C.
MAX4818
15 16 6
+
*EP
5
1 NO1
2 V-
3 GND
4 NO2
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
Pin Configurations continued at end of data sheet.
Ordering Information
PART MAX4818ETE+ MAX4819ETE+ TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 16 TQFN-EP* 16 TQFN-EP* CONFIGURATION 2 x SPDT 4:1 MUX PACKAGE CODE T1655-3 T1655-3
*EP = Exposed Paddle Devices are available in lead-free packages.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Bandwidth T1/E1 Dual-SPDT Switches/ 4:1 Muxes MAX4818/MAX4819
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.) V+ ............................