XR88C681J-F Exar Corporation, XR88C681J-F Datasheet - Page 34

• Manufacturer Part Number: XR88C681J-F
• Description: IC UART CMOS DUAL 44PLCC
• Manufacturer: Exar Corporation
• Type: CMOS Dual Channel UARTr

Specifications of XR88C681J-F

• Number Of Channels: 2, DUART
• Package / Case: 44-LCC (J-Lead)
• Features: *
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• With Parallel Port: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current: 15 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 5 V
• Propagation Delay Time Ns: 400 ns
• No. Of Channels: 2
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: PLCC
• No. Of Pins: 44
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1329

Figure 11 presents a schematic where the DUART will request a “External-Vectored” Interrupt to the 8085 CPU. In this
case, the Interrupt Service Routine for the DUART must begin at 0020
Rev. 2.11
8085 CPU
Figure 10. The XR88C681/8085 CPU Interface for Direct Interrupt Processing
AD0 - AD7
A15 - A8
(Interrupt Service Routine is located at 0034
RST 6.5
-IO/M
ALE
-WR
-RD
74LS373
D
C
34
Address Decoding
Q
Logic
-MEMR
-MEMW
-IOR
-IOW
A7 - A4
16
16
in system memory.
V
in System Memory)
cc
-INTR
D0 - D7
A0 - A3
-CS
-RD
-WR
XR88C681