Texas Instruments SN54LVT245B, SN74LVT245B 3.3-V ABT OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS User Manual Data Sheet

查询SN54LVT245供应商 SN54LVT245B, SN74LVT245B

3.3-V ABT OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS SCES004D – JANUARY 1995 – REVISED APRIL 2000

State-of-the-Art Advanced Bi CMOS SN54LVT245B J OR W PACKAGE SN74LVT245B DB, DW, OR PW PACKAGE

Technology (ABT) Design for 3.3-V

(TOP VIEW)

Operation and Low Static-Power Dissipation

DIR VCC

Support Mixed-Mode Signal Operation (5-V

A1 OE

Input and Output Voltages With 3.3-V VCC)

Support Unregulated Battery Operation A3 B2 Down to 2.7 V

A4 B3 Typical VOLP (Output Ground Bounce) A5 B4

<0.8 V at VCC = 3.3 V, TA = 25°C A6 B5

Ioff and Power-Up 3-State Support Hot A7 B6 Insertion A8 B7 GND B8

Latch-Up Performance Exceeds 100 m A Per JESD 78, Class II

ESD Protection Exceeds JESD 22 SN54LVT245B FK PACKAGE

(TOP VIEW)

– 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages, Ceramic Chip Carriers (FK), A5 B3 Ceramic Flat (W) Packages, and Ceramic A6 B4 (J) DIPs A7 B5

description These octal bus transceivers are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface

to a 5-V system environment. These devices are designed for asynchronous communication between data buses. They transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the devices so the buses are effectively isolated. When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. The SN54LVT245B is characterized for operation over the full military temperature range of –55°C to 125°C. The SN74LVT245B is characterized for operation from –40°C to 85°C.

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DATA information current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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