SCN2681AC1N28 NXP Semiconductors, SCN2681AC1N28 Datasheet - Page 20

• Manufacturer Part Number: SCN2681AC1N28
• Manufacturer: NXP Semiconductors

Specifications of SCN2681AC1N28

• Number Of Channels: 2
• Transmitter And Receiver Fifo Counter: No
• Operating Supply Voltage (typ): 5V
• Package Type: PDIP
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Mounting: Through Hole
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
TIMING DIAGRAMS
2004 Mar 18
NOTES:
1. INTRN or OP3 – OP7 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 themidpoint of the switching signal, V
X1/CLK
When using an external clock it is preferred to drive X2 and leave X1 open.
X2 is the input to the internal driver, while X1 is the output.
R1 is only required if U1 will not drive to X2 high level.
Previous specifications indicated X2 should be grounded and X1
should be driven. This is still acceptable. It is electrically easier to drive
the amplifier input than to overdrive its output.
CTCLK
Dual asynchronous receiver/transmitter (DUART)
point 0.5V above V
and can greatly affect the resultant measurement.
RxC
TxC
OL
. This point represents noise margin that assures true switching has occurred. Beyond this level, the effects of external circuitry and test environment are pronounced
t
t
t
t
CLK
CTC
Rx
Tx
(Continued)
(1X OUTPUT)
(INPUT)
t
t
t
t
CLK
CTC
Rx
Tx
TxC
TxC
TxD
INTERRUPT
OUTPUT
EXTERNAL SOURCE
WRN
RDN
DRIVING FROM
Figure 6. Interrupt Timing
OR
Figure 7. Clock Timing
1
t
TXD
(1 OR 16 CLOCKS)
Figure 8. Transmit
U1
1 BIT TIME
t
TCS
OPEN
1K
20
+5V
R1
V
X2
X1
t
M
IR
CRYSTAL SERIES RESISTANCE3 SHOULD BE LESS THAN 180
C2
C1
V
OL
V
+0.5V
R1: 100K - 1Meg (See design note)
C1 = C2: 0-5pF + (STRAY < 5pF)
OL
3.6864MHz
SD00092
R2 = 50k to 150k
X1
X2
R2
SCN2681
74LS04
SCN2681
1K
+5V
TO THE REST
OF THE DUART
CIRCUITS
Product data
CLOCK
TO OTHER
CHIPS
SD00091
SD00090
M
, to a