Texas Instruments SN74CBT3125C Data Sheet

查询SN74CBT3125CDB供应商

SCDS122A − JULY 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 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, Bus Isolation,

Low Power Consumption

Low-Distortion Signal Gating

(ICC = 3 µA Max) 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)

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

1OE VCC NC VCC 1A 4OE 1OE 4OE 1B 4A 1A 4A

1A 4OE

2OE 4B 1B 4B

2A 3OE 2OE 3OE

2OE 4B

2A 3OE

GND 3B 2B 3B

GND NC

NC − No internal connection

description/ordering information The SN74CBT3125C 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 SN74CBT3125C 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 SN74CBT3125C is organized as four 1-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 1-bit bus switches or as one 4-bit bus switch. When OE is low, the associated 1-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 1-bit bus switch is OFF, and the 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.

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