ADG3257 Datasheet, PDF (1/8 Pages) Analog Devices – High Speed, 3.3 V/5 V Quad 2:1 Mux/Demux (4-Bit, 1 of 2) Bus Switch

a High Speed, 3.3 V/5 V Quad 2:1 Mux/Demux
(4-Bit, 1 of 2) Bus Switch
ADG3257
FEATURES
FUNCTIONAL BLOCK DIAGRAM
100 ps Propagation Delay through the Switch
2 ⍀ Switches Connect Inputs to Outputs
1B₁
1A
Data Rates up to 933 Mbps
1B₂
Single 3.3 V/5 V Supply Operation
2B₁
Level Translation Operation
2A
2B₂
Ultralow Quiescent Supply Current (1 nA Typical)
3.5 ns Switching
3A
3B₁
Standard ‘3257 Type Pinout
3B₂
4B₁
APPLICATIONS
4A
Bus Switching
4B₂
Bus Isolation
Level Translation
Memory Switching/Interleaving
LOGIC
BE
S
GENERAL DESCRIPTION
The ADG3257 is a CMOS bus switch comprised of four 2:1
multiplexers/demultiplexers with high impedance outputs. The
device is manufactured on a CMOS process. This provides low
power dissipation yet high switching speed and very low ON
resistance, allowing the inputs to be connected to the outputs
without adding propagation delay or generating additional ground
bounce noise.
The ADG3257 operates from a single 3.3 V/5 V supply. The
control logic for each switch is shown in Table I. These switches
are bidirectional when ON. In the OFF condition, signal levels are
blocked up to the supplies.
This bus switch is suited to both switching and level translation
applications. It may be used in applications requiring level
translation from 3.3 V to 2.5 V when powered from 3.3 V.
Additionally, with a diode connected in series with 5 V V_DD,
the ADG3257 may also be used in applications requiring 5 V
to 3.3 V level translation.
Table I. Truth Table
BE
S
Function
H
X
DISABLE
L
L
A = B₁
L
H
A = B₂
PRODUCT HIGHLIGHTS
1. 0.1 ns propagation delay through switch
2. 2 Ω switches connect inputs to outputs
3. Bidirectional operation
4. Ultralow power dissipation
5. 16-lead QSOP package
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.