ADG3242 AD [Analog Devices], ADG3242 Datasheet

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ADG3242

Manufacturer Part Number
ADG3242
Description
2.5 V/3.3 V, 2-Bit, Common Control Level Translator Bus Switch
Manufacturer
AD [Analog Devices]
Datasheet

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GENERAL DESCRIPTION
The ADG3242 is a 2.5 V or 3.3 V, 2-bit, 2-port common-
control digital switch. It is designed on a low voltage CMOS
process, which provides low power dissipation yet gives high
switching speed and very low on resistance. This allows the inputs
to be connected to the outputs without additional propagation
delay or generating additional ground bounce noise.
These switches are enabled by means of a common bus enable
(BE) input signal. This digital switch allows a bidirectional
signal 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 is allowed. 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, a level
translating select pin (SEL) is included. When SEL is low, V
is reduced internally, allowing for level translation between 3.3
V inputs and 1.8 V outputs. This makes the device suitable for
applications requiring level translation between different supplies,
such as converter to DSP/microcontroller interfacing.
REV. 0
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.
FEATURES
225 ps Propagation Delay through the Switch
4.5
Data Rate 1.5 Gbps
2.5 V/3.3 V Supply Operation
Selectable Level Shifting/Translation
Level Translation
Small Signal Bandwidth 710 MHz
8-Lead SOT-23 Package
APPLICATIONS
3.3 V to 2.5 V Voltage Translation
3.3 V to 1.8 V Voltage Translation
2.5 V to 1.8 V Voltage Translation
Bus Switching
Bus Isolation
Hot Swap
Hot Plug
Analog Switch Applications
3.3 V to 2.5 V
3.3 V to 1.8 V
2.5 V to 1.8 V
Switch Connection between Ports
CC
2.5 V/3.3 V, 2-Bit, Common Control
PRODUCT HIGHLIGHTS
1. 3.3 V or 2.5 V supply operation.
2. Extremely low propagation delay through switch.
3. 4.5 Ω switches connect inputs to outputs.
4. Level/voltage translation.
5. Tiny SOT-23 package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Level Translator Bus Switch
FUNCTIONAL BLOCK DIAGRAM
A0
A1
BE
© 2003 Analog Devices, Inc. All rights reserved.
ADG3242
B0
B1
www.analog.com

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ADG3242 Summary of contents

Page 1

... Hot Plug Analog Switch Applications GENERAL DESCRIPTION The ADG3242 3.3 V, 2-bit, 2-port common- control digital switch designed on a low voltage CMOS process, which provides low power dissipation yet gives high switching speed and very low on resistance. This allows the inputs to be connected to the outputs without additional propagation delay or generating additional ground bounce noise ...

Page 2

... ADG3242–SPECIFICATIONS Parameter DC ELECTRICAL CHARACTERISTICS Input High Voltage Input Low Voltage Input Leakage Current OFF State Leakage Current ON State Leakage Current Maximum Pass Voltage 3 CAPACITANCE A Port Off Capacitance B Port Off Capacitance A, B Port On Capacitance Control Input Capacitance 3 SWITCHING CHARACTERISTICS 4 Propagation Delay ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADG3242 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... ADG3242 V Positive Power Supply Voltage. CC GND Ground (0 V) Reference. V Minimum Input Voltage for Logic 1. INH V Maximum Input Voltage for Logic 0. INL I Input Leakage Current at the Control Inputs OFF State Leakage Current the maximum leakage current at the switch pin in the OFF state. ...

Page 5

... Voltage for Different Temperatures 2 2.7V CC SEL = – 1 2. 2.3V CC 1.0 0 0.5 1.0 1.5 2.0 2 TPC 7. Pass Voltage vs REV. 0 Typical Performance Characteristics–ADG3242 2. SEL = 2. 2. 0.5 1.0 1.5 2.0 2.5 3 TPC 2. On Resistance vs. Input Voltage ...

Page 6

... ADG3242 3 2 2.0 = 3.3V; SEL = 1.5 = SEL = 3. 1.0 0.5 = SEL = 2. 0.02 0.04 0.06 0.08 0.10 I (A) O TPC 10. Output Low Characteristic –1 –2 – – 3.3V/2.5V CC –5 SEL = 0dBm –6 IN N/W ANALYZER: – –8 0.03 0.1 1.0 10 100 1000 FREQUENCY (MHz) TPC 13. Bandwidth vs. Frequency 4 ...

Page 7

... TPC 19. Eye Width vs. Data Rate; PRBS 31 REV 3.3V 20dB CC 50mV/DIV SEL = 3.3V ATTENUATION 200ps/DIV V = 1.5V p TPC 20. Eye Pattern; 1.5 Gbps 3.3 V, PRBS 31 CC –7– ADG3242 V = 2.5V 20dB CC 20mV/DIV SEL = 2.5V ATTENUATION 200ps/DIV V = 1.5V p TPC 21. Eye Pattern; 1.244 Gbps 2.5 V, PRBS 31 CC ...

Page 8

... ADG3242 TIMING MEASUREMENT INFORMATION For the following load circuit and waveforms, the notation that is used is V and V where IN OUT = = = V V and and OUT OUT PULSE DUT GENERATOR R T NOTES t PULSE GENERATOR FOR ALL PULSES: 2 ...

Page 9

... In this case 1.8 V Translation The ADG3242 offers the option of interfacing between a 3.3 V device and a 1.8 V device. This is possible through use of the SEL pin. The SEL pin is an active low control pin. SEL acti- vates internal circuitry in the ADG3242 that allows voltage translation between 3 ...

Page 10

... Figure 11. Location of Bus Switched in a Bus Isolation Application Hot Plug and Hot Swap Isolation The ADG3242 is suitable for hot swap and hot plug applications. The output signal of the ADG3242 is limited to a voltage that is below the V supply, as shown in Figures 6, 8, and 10. Therefore CC the switch acts like a buffer to take the impact from hot insertion, protecting vital and expensive chipsets from damage ...

Page 11

... BSC 1.30 1.15 0.90 0.15 MAX REV. 0 OUTLINE DIMENSIONS 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters 2.90 BSC 2.80 BSC PIN 1 0.65 BSC 1.95 BSC 1.45 MAX 0.22 0.08 0.38 0.22 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-178BA –11– ADG3242 0.60 8 0.45 4 0.30 0 ...

Page 12

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