SN74ABT646DWR屬于集成電路（IC）的緩沖器驅動器接收器收發(fā)器。由美國德州儀器公司制造生產的SN74ABT646DWR緩沖器，驅動器，接收器，收發(fā)器邏輯緩沖器、驅動器、接收器和收發(fā)器允許隔離對某個電路的邏輯信號的訪問，以用于另一電路。緩沖器將其輸入信號（不變或反相）傳遞到其輸出，并可能用于清除弱信號或驅動負載。在布爾邏輯仿真器中，緩沖器主要用于增加傳播延遲。邏輯接收器和收發(fā)器允許在數(shù)據(jù)總線之間進行隔離通信。

State-of-the-Art EPIC-IIBE BiCMOS Design

Significantly Reduces Power Dissipation

ESD Protection Exceeds 2000 V Per

MIL-STD-883C, Method 3015; Exceeds

200 V Using Machine Model (C = 200 pF,

R = 0)

Latch-Up Performance Exceeds 500 mA

Per JEDEC Standard JESD-17

Typical VOLP (Output Ground Bounce)

< 1 V at VCC = 5 V, TA = 25°C

High-Drive Outputs (–32-mA IOH,

64-mA IOL)

Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

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

Packages, Ceramic Chip Carriers (FK), and

Plastic (NT) and Ceramic (JT) DIPs

description

These devices consist of bus transceiver circuits,

D-type flip-flops, and control circuitry arranged for

multiplexed transmission of data directly from the

input bus or from the internal registers. Data on the

A or B bus is clocked into the registers on the

low-to-high transition of the appropriate clock

(CLKAB or CLKBA) input. Figure 1 illustrates the

four fundamental bus-management functions that

can be performed with the 4ABT646.

Output-enable (OE) and direction-control (DIR)

inputs are provided to control the transceiver

functions. In the transceiver mode, data present at

the high-impedance port may be stored in either

register or in both.

The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The

direction control (DIR) determines which bus will receive data when OE is low. In the isolation mode (OE high),

A data may be stored in one register and/or B data may be stored in the other register.

When an output function is disabled, the input function is still enabled and may be used to store and transmit

data. Only one of the two buses, A or B, may be driven at a time.

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.

The SN74ABT646 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count

and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN54ABT646 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74ABT646 is characterized for operation from –40°C to 85°C.