XR68C681J-F Exar Corporation, XR68C681J-F Datasheet - Page 35

• Manufacturer Part Number: XR68C681J-F
• Description: IC UART CMOS DUAL 44PLCC
• Manufacturer: Exar Corporation
• Type: CMOS Dual Channel UARTr

Specifications of XR68C681J-F

• Number Of Channels: 2, DUART
• Package / Case: 44-LCC (J-Lead)
• Features: *
• Fifo's: 1 Byte, 3 Byte
• Voltage - Supply: 5V
• Mounting Type: Surface Mount
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 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: 1016-1324-5

D.8 Explanation of Clock Timing Signals
t
t
Time - IP2 Input
CLK
CTC
f
CLK
- X1/CLK (External) High or Low Time
- Counter/Timer External Clock High or Low
Symbol
- X1/CLK Crystal High or Low Time
Table 11. The XR68C681 Data Sheet presents the following parameter specifications, in the
Parameter
“AC ELECTRICAL CHARACTERISTICS”
f
Input
t
via IP2, IP3, IP4 and IP5
CTC
RTX
- RXC and TXC (External) High or Low Time -
- Counter/Timer External Clock Frequency - IP2
Min.
Limits
Typ.
XR68C681
Max.
Units