SCC2691 Philips Semiconductors, SCC2691 Datasheet - Page 16

• Manufacturer Part Number: SCC2691
• Description: Universal asynchronous receiver/transmitter UART
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
1998 Sep 04
C/T CLK
Universal asynchronous receiver/transmitter (UART)
X1/CLK
RxC
TxC
NOTES:
1. INTRN or MPO when used as interrupt outputs.
2. 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
are pronounced and can greatly affect the resultant measurement.
MPO
WRN
RDN
M
MPI
, to a point 0.5V above V
FROM EXTERNAL
CLK
DRIVING
SOURCE
t
PS
INTERRUPT
INTERRUPT
5V
OUTPUT
OUTPUT
OL
. This point represents noise margin that assures true switching has occurred. Beyond this level, the effects of external circuitry and test environment
t
t
470
t
t
WRN
CLK
CTC
N/C
RDN
Rx
Tx
1
1
t
PH
X1
X2
t
t
t
t
CLK
CTC
Rx
Tx
Figure 6. Interrupt Timing
Figure 7. Clock Timing
Figure 5. I/O Timing
t
IR
16
TYPE OF OPERATION . . . . . .PARALLEL RESONANT, FUND. MODE
FREQUENCY. . . . . . . . . . . . . . 2–4MHz
LOAD CAPACITANCE (C
V
M
t
IR
TYPICAL CRYSTAL SPECIFICATION
C1
C2
V
L
Y1 = 3.6864MHz, C
). . . 20 or 32pF (typical)
t
C1 = C2 = 24pF
OL
PD
V
OL
+0.5V
+0.5V
V
Y1
OL
V
OL
L
= 20pF
X1/CLK
X2
50k
to
150k
SCC2691
SD00125
Product specification
SCC2691
SD00127
SD00126