2.5 V/3.3 V, 8-Bit, 2-Port Level Translating, Bus Switch ADG3245 FEATURES FUNCTIONAL BLOCK DIAGRAM 225 ps Propagation Delay through the Switch A0 B0 4.5 Switch Connection between Ports Data Rate 1.244 Gbps 2.5 V/3.3 V Supply Operation Selectable Level Shifting/Translation Level Translation 3.3 V to 2.5 V 3.3 V to 1.8 V A7 B7 2.5 V to 1.8 V Small Signal Bandwidth 610 MHz 20-Lead TSSOP and LFCSP Packages APPLICATIONS BE 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 GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The ADG3245 is a 2.5 V or 3.3 V, 8-bit, 2-port digital switch. 1. 3.3 V or 2.5 V supply operation It is designed on Analog Devices low voltage CMOS process, 2. Extremely low propagation delay through switch which provides low power dissipation yet gives high switching 3. 4.5 W switches connect inputs to outputs speed and very low on resistance, allowing inputs to be connected 4. Level/voltage translation to outputs without additional propagation delay or generating 5. 20-lead TSSOP and LFCSP (4 mm 4 mm) packages 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 is reduced internally, allowing for level translation between CC 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. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20032015 Analog Devices, Inc. All rights reserved. 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 owners. Technical Support www.analog.com (V = 2.3 V to 3.6 V, GND = 0 V, all specifications T to T , unless 1 CC MIN MAX ADG3245SPECIFICATIONS otherwise noted.) B Version 2 Parameter Symbol Conditions Min Typ Max Unit DC ELECTRICAL CHARACTERISTICS Input High Voltage V V = 2.7 V to 3.6 V 2.0 V INH CC V V = 2.3 V to 2.7 V 1.7 V INH CC Input Low Voltage V V = 2.7 V to 3.6 V 0.8 V INL CC V V = 2.3 V to 2.7 V 0.7 V INL CC Input Leakage Current I 0.01 1 mA I OFF State Leakage Current I 0 A, B V 0.01 1 mA OZ CC ON State Leakage Current 0 A, B V 0.01 1 mA CC Maximum Pass Voltage V V /V = V = SEL = 3.3 V, I = 5 mA 2.0 2.5 2.9 V P A B CC O V /V = V = SEL = 2.5 V, I = 5 mA 1.5 1.8 2.1 V A B CC O V /V = V = 3.3 V, SEL = 0 V, I = 5 mA 1.5 1.8 2.1 V A B CC O 3 CAPACITANCE A Port Off Capacitance C OFF f = 1 MHz 5 pF A B Port Off Capacitance C OFF f = 1 MHz 5 pF B A, B Port On Capacitance C , C ON f = 1 MHz 10 pF A B Control Input Capacitance C f = 1 MHz 6 pF IN 3 SWITCHING CHARACTERISTICS 4 Propagation Delay A to B or B to A, t t , t C = 50 pF, V = SEL = 3 V 0.225 ns PD PHL PLH L CC 5 Propagation Delay Matching 22.5 ps 6 Bus Enable Time BE to A or B t , t V = 3.0 V to 3.6 V SEL = V 1 3.2 4.8 ns PZH PZL CC CC 6 Bus Disable Time BE to A or B t , t V = 3.0 V to 3.6 V SEL = V 1 3.2 4.8 ns PHZ PLZ CC CC 6 Bus Enable Time BE to A or B t , t V = 3.0 V to 3.6 V SEL = 0 V 0.5 2.2 3.3 ns PZH PZL CC 6 Bus Disable Time BE to A or B t , t V = 3.0 V to 3.6 V SEL = 0 V 0.5 1.7 2.9 ns PHZ PLZ CC 6 Bus Enable Time BE to A or B t , t V = 2.3 V to 2.7 V SEL = V 0.5 2.2 3 ns PZH PZL CC CC 6 Bus Disable Time BE to A or B t , t V = 2.3 V to 2.7 V SEL = V 0.5 1.75 2.6 ns PHZ PLZ CC CC Maximum Data Rate V = SEL = 3.3 V V /V = 2 V 1.244 Gbps CC A B Channel Jitter V = SEL = 3.3 V V /V = 2 V 50 ps p-p CC A B Operating FrequencyBus Enable f 10 MHz BE DIGITAL SWITCH On Resistance R V = 3 V, SEL = V , V = 0 V, I = 8 mA 4.5 8 W ON CC CC A BA V = 3 V, SEL = V , V = 1.7 V, I = 8 mA 15 28 W CC CC A BA V = 2.3 V, SEL = V , V = 0 V, I = 8 mA 5 9 W CC CC A BA V = 2.3 V, SEL = V , V = 1 V, I = 8 mA 11 18 W CC CC A BA V = 3 V, SEL = 0 V V = 0 V, I = 8 mA 5 8 W CC A BA V = 3 V, SEL = 0 V, V = 1 V, I = 8 mA 14 W CC A BA On Resistance Matching R V = 3 V, SEL = V , V = 0 V, I = 8 mA 0.45 W ON CC CC A BA V = 3 V, SEL = V , V = 1 V, I = 8 mA 0.65 W CC CC A BA POWER REQUIREMENTS V 2.3 3.6 V CC Quiescent Power Supply Current I Digital Inputs = 0 V or V SEL = V 0.001 1 mA CC CC CC Digital Inputs = 0 V or V SEL = 0 V 0.65 1.2 mA CC 7 Increase in I per Input I V = 3.6 V, BE = 3.0 V SEL = V 130 mA CC CC CC CC NOTES 1 Temperature range is as follows: B Version: 40 r C to +85 r C. 2 Typical values are at 25 r C, unless otherwise stated. 3 Guaranteed by design, not subject to production test. 4 The digital switch contributes no propagation delay other than the RC delay of the typical R of the switch and the load capacitance when driven by an ideal voltage ON source. Since the time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay of the digital switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side. 5 Propagation delay matching between channels is calculated from the on resistance matching and load capacitance of 50 pF. 6 See Timing Measurement Information section. 7 This current applies to the control pin BE only. The A and B ports contribute no significant ac or dc currents as they transition. Specifications subject to change without notice. 2 REV.