SCC2681T 查看數據表（PDF） - Philips Electronics
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SCC2681T Datasheet PDF : 15 Pages
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Philips Semiconductors
Dual asynchronous receiver/transmitter (DUART)
Product data
SCC2681T
X1/CLK
CTCLK
RxC
TxC
tCLK
tCTC
tRx
tTx
tCLK
tCTC
tRx
tTx
+5 V
R1
1 kΩ
U1
X1
RESISTOR REQUIRED
WHEN U1 IS A TTL DEVICE
NC
X2
C1 = C2 = 24 pF FOR CL = 20 pF
X1
3.6864 MHz
X2
SCC2681T
3 pF
4 pF
50 TO
150 kΩ
TO INTERNAL CLOCK DRIVERS
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:
LOAD CAPACITANCE (CL):
TYPE OF OPERATION:
2 – 4 MHz
12 – 32 pF
PARALLEL RESONANT, FUNDAMENTAL MODE
Figure 7. Clock Timing
SD00726
TxC
(INPUT)
TxD
TxC
(1X OUTPUT)
1 BIT TIME
(1 OR 16 CLOCKS)
tTXD
tTCS
Figure 8. Transmit
SD00103
RxC
(1X INPUT)
RxD
2004 Apr 06
tRXS
tRXH
11
SD00104
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