XR88C681J-F Exar Corporation, XR88C681J-F Datasheet - Page 32

IC UART CMOS DUAL 44PLCC

XR88C681J-F

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

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

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Manufacturer:
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The DUART’s
Figure 9, because its use will be addressed in Figure 10
and Figure 11.
8085 CPU Module Interrupt Structure
The 8085 CPU supports both Direct and “External”
Vectored Interrupt processing. The 8085 has 4 maskable
interrupt request inputs (RST 5.5, RST 6.5, RTS 7.5, and
INTR), and 1 non-maskable interrupt request input
Rev. 2.11
Figure 9. Schematic of the XR88C681 Interface to the 8085 CPU Module (Memory Mapped).
-
INTR pin was deliberately omitted from
TRAP
X1
RST 7.5
RST 6.5
INTR
-
X2
RST 5.5
8085 CPU
INTA
AD0 - AD7
A8 - A15
-
IO/M
-
ALE
-
WR
RD
1D - 8D
C
74LS373
1Q - 8Q
-
-MEMW
MEMR
32
(TRAP). When discussing interfacing for the interrupt
servicing of peripheral devices such as the DUART, we
are only concerned with the maskable interrupt request
inputs. Of the four maskable interrupt request inputs;
three of these inputs support “Direct Interrupt”
processing.
supports “External Vectored Interrupt” processing.
Table 11 lists these Interrupt Request inputs and their
characteristics/features.
A8 - A15
A4 - A7
Address
Decoder
A0 - A3
The remaining one interrupt request
-CS_DUART
-CS_OTHER_IC
A0 - A3
-
XR88C681
D0 - D7
-
-
CS
RD
WR

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