REV. 0

ADG3247

2.5 V/3.3 V, 16-Bit, 2-Port

Level Translating, Bus Switch

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© 2003 Analog Devices, Inc. All rights reserved.

FEATURES

225 ps Propagation Delay through the Switch

4.5

Switch Connection between Ports

Data Rate 1.244 Gbps

2.5 V/3.3 V Supply Operation

Selectable Level Shifting/Translation

Small Signal Bandwidth 610 MHz

Level Translation

3.3 V to 2.5 V

3.3 V to 1.8 V

2.5 V to 1.8 V

40-Lead 6 mm

6 mm LFCSP and 38-Lead TSSOP

Packages

APPLICATIONS

3.3 V to 1.8 V Voltage Translation

3.3 V to 2.5 V Voltage Translation

2.5 V to 1.8 V Voltage Translation

Bus Switching

Bus Isolation

Hot Plug

Hot Swap

Analog Switching Applications

FUNCTIONAL BLOCK DIAGRAM

A7

B7

BE1

A0

B0

A15

B15

BE2

A8

B8

GENERAL DESCRIPTION

The ADG3247 is a 2.5 V or 3.3 V 16-bit, 2-port digital switch.

It is designed on Analog Devices’ low voltage CMOS process,

which provides low power dissipation yet gives high switching

speed and very low on resistance, allowing inputs to be connected

to outputs without additional propagation delay or generating

additional ground bounce noise.

The ADG3247 is organized as dual 8-bit bus switches with

separate bus enable (

BEx) inputs. This allows the device to be

used as two 8-bit digital switches or one 16-bit bus switch. These

bus switches allow bidirectional signals to be switched when ON.

In the OFF condition, signal levels up to the supplies are blocked.

This device is ideal for applications requiring level translation.

When operated from a 3.3 V supply, level translation from 3.3 V

inputs to 2.5 V outputs occurs. Similarly, if the device is operated

from a 2.5 V supply and 2.5 V inputs are applied, the device will

translate the outputs to 1.8 V. In addition to this, the ADG3247

has a level translating select pin (

SEL). When SEL is low, V

reduced internally, allowing for level translation between 3.3 V

inputs and 1.8 V outputs. This makes the device suited to appli-

cations requiring level translation between different supplies, such

as converter to DSP/microcontroller interfacing.

PRODUCT HIGHLIGHTS

1. 3.3 V or 2.5 V supply operation

2. Extremely low propagation delay through switch

3. 4.5

W switches connect inputs to outputs

4. Level/voltage translation

5. 40-lead 6 mm

6 mm LFCSP and 38-lead TSSOP packages