XR88C681CJ View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR88C681CJ

CMOS Dual Channel UART (DUART)

Exar Corporation 

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XR88C681

Figure 21 and Figure 22 present the 8086 CPU Mode, when operating in the “min” and “max” modes, respectively.

AD0 - AD7

INTR

-INTA

HOLD

AD8 - AD15

ALE

-DEN

DT/-R

M/-IO

Vcc

-RD

MN/-MX

8086 CPU

-WR

D

Q

C

74LS373

D

Q

C

74LS373

D0 - D7

A0 - A7

D8 - D15

A8 - A15

-IOR

-MEMR

-IOW

-MEMW

Figure 21. Schematic of the 8086 CPU Mode (Min Mode)

Rev. 2.11

48

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