SCN2681AC1N28 NXP Semiconductors, SCN2681AC1N28 Datasheet - Page 18

• Manufacturer Part Number: SCN2681AC1N28
• Manufacturer: NXP Semiconductors

Specifications of SCN2681AC1N28

• Number Of Channels: 2
• Transmitter And Receiver Fifo Counter: No
• Operating Supply Voltage (typ): 5V
• Package Type: PDIP
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Mounting: Through Hole
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
Table 3. Bit Rate Generator Characteristics Crystal or Clock = 3.6864MHz
NOTE: Duty cycle of 16x clock is 50%
Asynchronous UART communications can tolerate frequency error
of 4.1% to 6.7% in a “clean” communications channel. The percent
of error changes as the character length changes. The above
percentages range from 5 bits not parity to 8 bits with parity and one
Table 4. ACR 6:4 Field Definition
NOTE: Timer mode generates a squarewave.
2004 Mar 18
Dual asynchronous receiver/transmitter (DUART)
NORMAL RATE (BAUD)
ACR 6:4
000
001
010
100
101
011
110
111
1050
1200
1800
2000
2400
4800
7200
9600
134.5
150
200
300
600
110
115.2K
50
75
14.4K
19.2k
28.8K
38.4k
57.6K
Timer (square wave)
Timer (square wave)
Timer (square wave)
Timer (square wave)
1%.
Counter
Counter
Counter
Counter
MODE
ACTUAL 16x CLOCK (kHz)
1843.2K
153.6
230.4
307.2
460.8
614.4
921.6
115.2
16.756
19.2
28.8
32.056
38.4
76.8
0.8
1.2
1.759
2.153
2.4
3.2
4.8
9.6
18
stop bit. The error with 8 bits no parity and one stop bit is 4.6%. If a
stop bit length of 9/16 is used, the error tolerance will approach 0
due to a variable error of up to 1/16 bit time in receiver clock phase
alignment to the start bit.
External (IP2)
TxCA – 1x clock of Channel A transmitter
TxCB – 1x clock of Channel B transmitter
Crystal or external clock (x1/CLK) divided by 16
External (IP2)
External (IP2) divided by 16
Crystal or external clock (x1/CLK)
Crystal or external clock (x1/CLK) divided by 16
CLOCK SOURCE
ERROR (%)
0
0
-0.069
0.059
0
0
0
0
-0.260
0
0
0.175
0
0
0
0
0
0
0
0
0
0
SCN2681
Product data