SCC2692 Philips, SCC2692 Datasheet - Page 21

• Manufacturer Part Number: SCC2692
• Description: Dual asynchronous receiver/transmitter DUART
• Manufacturer: Philips

Philips Semiconductors
1998 Sep 04
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
NOTES:
1.
2.
INTRN or OP3-OP7 when used as interrupt outputs.
The test for open-drain outputs is intended to guarantee switching of the output transistor. Measurement of this response is referenced from the midpoint of the switching
signal, V
test environment are pronounced and can greatly affect the resultant measurement.
X1/CLK
CTCLK
RxC
TxC
M
, to a point 0.5V above V
C1 = C2 = 24pF FOR C
OL
t
t
FREQUENCY:
LOAD CAPACITANCE (C
TYPE OF OPERATION:
INTERRUPT
INTERRUPT
CLK
CTC
t
t
Rx
Tx
. This point represents noise margin that assures true switching has occurred. Beyond this level, the effects of external circuitry and
OUTPUT
OUTPUT
3.6864MHz
WRN
RDN
L
= 20PF
1
1
L
TYPICAL CRYSTAL SPECIFICATION
):
Figure 6. Interrupt Timing
X1
X2
Figure 7. Clock Timing
t
t
CLK
CTC
t
t
Rx
Tx
2 – 4MHZ
12 – 32pF
PARALLEL RESONANT, FUNDAMENTAL MODE
V
M
SCC2698B
21
4pF
3pF
50 TO
150 K
t
IR
V
M
t
IR
RESISTOR REQUIRED
WHEN U1 IS A TTL DEVICE
V
OL
V
U1
OL
+0.5V
TO INTERNAL CLOCK DRIVERS
+0.5V
V
OL
V
OL
+5V
1K
R1
NC
Product specification
SD00137
SCC2692
SD00136
X1
X2