XR88C681CP/40-F Exar Corporation, XR88C681CP/40-F Datasheet - Page 73

• Manufacturer Part Number: XR88C681CP/40-F
• Description: IC UART CMOS DUAL 40PDIP
• Manufacturer: Exar Corporation
• Type: CMOS Dual Channel UARTr

Specifications of XR88C681CP/40-F

• Number Of Channels: 2, DUART
• Package / Case: 40-DIP (0.600", 15.24mm)
• Features: *
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• With Parallel Port: Yes
• With Cmos: Yes
• Mounting Type: Through Hole
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Supply Current: 15 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• 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: 0°C To +70°C
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Filter Terminals: DIP
• 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: 1016-1328-5

MR2n[7:6] - Channel Mode Select
Each Channel can operate in one of four modes.
D Setting MR2n[7:6] = 00 configures the channel to op-
erate in the Normal Mode. In this mode, the receiver
and transmitter operate independently.
presents a diagram depicting Normal Mode Opera-
tion.
Rev. 2.11
Incoming
Serial Data
Receive Holding
Register
RXDn
(To be read by the CPU)
Receive Shift Register
Figure 38. A Block Diagram Depicting Normal Mode Operation.
To Data Bus
8
Figure 38
RXCn
73
TXCn
D Setting MR2n[7:6] = 01 places the channel in the Auto-
matic Echo Mode, which automatically re-transmits
the received data. Figure 39 presents a diagram de-
picting Automatic Echo Mode Operation. The follow-
ing conditions apply while in this mode.
(Parallel data from the CPU)
Transmit Shift Register
From Data Bus.
8
XR88C681
TXDn
Transmit Holding
Register
Outgoing Serial
Data