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SN74CB3T3253DR Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74CB3T3253DR Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 20 page www.ti.com FEATURES 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1OE S1 1B4 1B3 1B2 1B1 1A GND VCC 2OE S0 2B4 2B3 2B2 2B1 2A D, DBQ, DGV, OR PW PACKAGE (TOP VIEW) DESCRIPTION/ORDERING INFORMATION SN74CB3T3253 DUAL 1-OF-4 FET MULTIPLEXER/DEMULTIPLEXER 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V TOLERANT LEVEL SHIFTER SCDS148 – OCTOBER 2003 – REVISED JUNE 2005 • Low Power Consumption (ICC = 20 µA Max) • Output Voltage Translation Tracks VCC • VCC Operating Range From 2.3 V to 3.6 V • Supports Mixed-Mode Signal Operation on All • Data I/Os Support 0- to 5-V Signaling Levels Data I/O Ports (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V) – 5-V Input Down to 3.3-V Output Level Shift • Control Inputs Can Be Driven by TTL or With 3.3-V VCC 5-V/3.3-V CMOS Outputs – 5-V/3.3-V Input Down to 2.5-V Output Level • Ioff Supports Partial-Power-Down Mode Shift With 2.5-V VCC Operation • 5-V Tolerant I/Os With Device Powered Up or • Latch-Up Performance Exceeds 250 mA Per Powered Down JESD 17 • Bidirectional Data Flow With Near-Zero • ESD Performance Tested Per JESD 22 Propagation Delay – 2000-V Human-Body Model • Low ON-State Resistance (ron) Characteristics (A114-B, Class II) (ron = 5 Ω Typ) – 1000-V Charged-Device Model (C101) • Low Input/Output Capacitance Minimizes • Supports Digital Applications: Level Loading (Cio(OFF) = 5 pF Typ) Translation, USB Interface, Memory • Data and Control Inputs Provide Undershoot Interleaving, Bus Isolation Clamp Diodes • Ideal for Low-Power Portable Equipment The SN74CB3T3253 is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance (ron), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3253 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1). The SN74CB3T3253 is organized as two 1-of-4 multiplexer/demultiplexers with separate output-enable (1OE, 2OE) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When OE is low, the associated multiplexer/demultiplexer is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated multiplexer/demultiplexer is OFF, and a high-impedance state exists between the A and B ports. This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that damaging current will not backflow through the device when it is powered down. The device has isolation during power off. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2003–2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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