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SCC2681T Datasheet(PDF) 11 Page - NXP Semiconductors

Part # SCC2681T
Description  Dual asynchronous receiver/transmitter (DUART)
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SCC2681T Datasheet(HTML) 11 Page - NXP Semiconductors

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Product data
SCC2681T
Dual asynchronous receiver/transmitter (DUART)
2004 Apr 06
11
X1/CLK
CTCLK
RxC
TxC
tCLK
tCTC
tRx
tTx
tCLK
tCTC
tRx
tTx
+5 V
R1
1 k
X1
X2
C1 = C2 = 24 pF FOR CL = 20 pF
X1
X2
3.6864 MHz
3 pF
4 pF
50 TO
150 k
TO INTERNAL CLOCK DRIVERS
SCC2681T
NOTE:
C1 AND C2 SHOULD BE BASED ON MANUFACTURER’S SPECIFICATION. PARASITIC CAPACITANCE SHOULD BE
INCLUDED WITH C1 AND C2. R1 IS ONLY REQUIRED IF U1 WILL NOT DRIVE TO X1 INPUT LEVELS
TYPICAL CRYSTAL SPECIFICATION
FREQUENCY:
2 – 4 MHz
LOAD CAPACITANCE (CL):
12 – 32 pF
TYPE OF OPERATION:
PARALLEL RESONANT, FUNDAMENTAL MODE
NC
SD00726
RESISTOR REQUIRED
WHEN U1 IS A TTL DEVICE
U1
Figure 7. Clock Timing
SD00103
TxD
TxC
(INPUT)
TxC
(1X OUTPUT)
tTXD
tTCS
1 BIT TIME
(1 OR 16 CLOCKS)
Figure 8. Transmit
tRXS
RxC
(1X INPUT)
RxD
tRXH
SD00104


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