adg3245 Analog Devices, Inc., adg3245 Datasheet

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adg3245

Manufacturer Part Number
adg3245
Description
2.5 V/3.3 V, 8-bit, 2-port Level Translating, Bus Switch
Manufacturer
Analog Devices, Inc.
Datasheet

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GENERAL DESCRIPTION
The ADG3245 is a 2.5 V or 3.3 V, 8-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 switches are enabled by means of the bus enable (BE) input
signal. These digital 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 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 to this, a
level translating select pin (SEL) is included. When SEL is low,
V
3.3 V inputs and 1.8 V outputs. This makes the device suited to
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.
CC
FEATURES
225 ps Propagation Delay through the Switch
4.5
Data Rate 1.244 Gbps
2.5 V/3.3 V Supply Operation
Selectable Level Shifting/Translation
Level Translation
Small Signal Bandwidth 610 MHz
20-Lead TSSOP and LFCSP 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 Swap
Hot Plug
Analog Switch Applications
is reduced internally, allowing for level translation between
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
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. 20-lead TSSOP and LFCSP (4 mm ¥ 4 mm) packages
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Level Translating, Bus Switch
A0
A7
BE
FUNCTIONAL BLOCK DIAGRAM
2.5 V/3.3 V, 8-Bit, 2-Port
© 2003 Analog Devices, Inc. All rights reserved.
ADG3245
www.analog.com
B0
B7

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adg3245 Summary of contents

Page 1

... Hot Plug Analog Switch Applications GENERAL DESCRIPTION The ADG3245 3.3 V, 8-bit, 2-port digital switch 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 ...

Page 2

... ADG3245–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 ADG3245 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

... ADG3245 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 2.5 3.0 V – TPC 7. Pass Voltage vs REV. 0 Typical Performance Characteristics–ADG3245 2. SEL = 2. 2. 0.5 1.0 1.5 2.0 2.5 3 – TPC 2. On Resistance vs. ...

Page 6

... ADG3245 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 – TPC 10. Output Low Characteristic – 3.3V/2.5V CC SEL = V CC – 0dBm IN N/W ANALYZER : – –8 –10 –12 –14 0.03 0 100 1000 FREQUENCY – MHz TPC 13. Bandwidth vs. Frequency 3 ...

Page 7

... TPC 22. Jitter @ 1.244 Gbps, PRBS 31 REV 3.3V 20dB CC 35mV/DIV SEL = 3.3V ATTENUATION 100ps/DIV p TPC 20. Eye Pattern; 1.244 Gbps 3.3 V, PRBS 31 CC –7– ADG3245 V = 2.5V 20dB CC 37mV/DIV SEL = 2.5V ATTENUATION 200ps/DIV p TPC 21. Eye Pattern; 1 Gbps 2.5 V, PRBS 31 CC ...

Page 8

... ADG3245 For the following load circuit and waveforms, the notation that is used OUT PULSE D.U.T. GENERATOR R T NOTES t PULSE GENERATOR FOR ALL PULSES: 2.5ns, R FREQUENCY 10MHz. C INCLUDES BOARD, STRAY, AND LOAD CAPACITANCES . THE TERMINATION RESISTOR, SHOULD BE EQUAL THE PULSE GENERATOR ...

Page 9

... MICROPROCESSOR Figure 8. 2 1.8 V Voltage Translation, SEL = V supply 1.8 V Translation The ADG3245 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. 2.5V SEL pin: An active low control pin. SEL activates internal circuitry in the ADG3245 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 ADG3245 is suitable for hot swap and hot plug applications. The output signal of the ADG3245 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

... Dimensions shown in millimeters 4.0 BSC SQ 0.60 MAX TOP 3.75 VIEW BSC SQ 0.75 0.55 0.35 0.80 MAX 12 MAX 0.65 NOM 0.05 0.02 0.00 COPLANARITY 0.50 0.20 0.08 REF BSC COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1 (RU-20) Dimensions shown in millimeters 6.60 6.50 6. 4.50 4.40 4.30 6.40 BSC 1 10 PIN 1 0.65 1.20 BSC MAX 0.20 0.09 0.30 SEATING 0.19 PLANE COMPLIANT TO JEDEC STANDARDS MO-153AC –11– ADG3245 0.60 MAX 2.25 BOTTOM 2.10 SQ VIEW 1. 0.30 0.23 0.18 0.75 8 0.60 0 0.45 ...

Page 12

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