Texas Instruments SN74CBT3244C Data Sheet

SCDS130A − SEPTEMBER 2003 − REVISED OCTOBER 2003

Undershoot Protection for Off-Isolation on Control Inputs Can Be Driven by TTL or A and B Ports Up To −2 V 5-V/3.3-V CMOS Outputs Bidirectional Data Flow, With Near-Zero Ioff Supports Partial-Power-Down Mode Propagation Delay Operation Low ON-State Resistance (ron) Latch-Up Performance Exceeds 100 m A Per Characteristics (ron = 3 Ω Typical) JESD 78, Class II Low Input/Output Capacitance Minimizes ESD Performance Tested Per JESD 22 Loading and Signal Distortion − 2000-V Human-Body Model (Cio(OFF) = 5.5 p F Typical) (A114-B, Class II)

− 1000-V Charged-Device Model (C101)

Data and Control Inputs Provide Undershoot Clamp Diodes Supports Both Digital and Analog

Applications: USB Interface, Memory

Low Power Consumption

Interleaving, Bus Isolation, Low-Distortion

(ICC = 3 µA Max)

Signal Gating

VCC Operating Range From 4 V to 5.5 V Data I/Os Support 0 to 5-V Signaling Levels (0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)

DB, DBQ, DGV, DW, OR PW PACKAGE RGY PACKAGE (TOP VIEW) (TOP VIEW)

1OE VCC 1A1 2OE 2B4 1B1

1A1 2OE

GND 2A1

description/ordering information The SN74CBT3244C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT3244C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring that the switch remains in the proper OFF state. The SN74CBT3244C is organized as two 4-bit bus switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 4-bit bus switches or as one 8-bit bus switch. When OE is low, the associated 4-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 4-bit bus switch is OFF, and the high-impedance state exists between the A and B ports.

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