scc2681t NXP Semiconductors, scc2681t Datasheet - Page 11

• Manufacturer Part Number: scc2681t
• Description: Dual Asynchronous Receiver/transmitter Duart
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2004 Apr 06
Dual asynchronous receiver/transmitter (DUART)
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
X1/CLK
CTCLK
RxC
TxC
C1 = C2 = 24 pF FOR C
(1X OUTPUT)
(INPUT)
(1X INPUT)
TxC
TxC
TxD
RxC
RxD
FREQUENCY:
LOAD CAPACITANCE (C
TYPE OF OPERATION:
t
t
L
CLK
CTC
t
t
Rx
Tx
= 20 pF
3.6864 MHz
L
TYPICAL CRYSTAL SPECIFICATION
):
t
TXD
X1
X2
Figure 7. Clock Timing
(1 OR 16 CLOCKS)
t
t
Figure 8. Transmit
CLK
CTC
t
t
Rx
Tx
1 BIT TIME
t
SCC2681T
RXS
2 – 4 MHz
12 – 32 pF
PARALLEL RESONANT, FUNDAMENTAL MODE
11
4 pF
3 pF
t
TCS
50 TO
150 k
t
RXH
RESISTOR REQUIRED
WHEN U1 IS A TTL DEVICE
TO INTERNAL CLOCK DRIVERS
U1
SD00104
+5 V
SD00103
R1
1 k
NC
SCC2681T
SD00726
X1
X2
Product data