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935002730512

更新时间： 2024-01-26 22:07:09
品牌 Logo 应用领域
恩智浦 - NXP 光电二极管
页数 文件大小 规格书
25页 183K
描述
IC 1 CHANNEL(S), 115.2K bps, SERIAL COMM CONTROLLER, PDSO24, 7.50 MM, PLASTIC, MS-013AD, SOT-137-1, SO-24, Serial IO/Communication Controller

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Philips Semiconductors  
Product data sheet  
Universal asynchronous receiver/transmitter (UART)  
SCC2691  
DESCRIPTION  
PIN CONFIGURATIONS  
The Philips Semiconductors SCC2691 Universal Asynchronous  
Receiver/Transmitter (UART) is a single-chip CMOS-LSI  
communications device that provides a full-duplex asynchronous  
receiver/transmitter. It is fabricated with Philips Semiconductors  
CMOS technology which combines the benefits of high density and  
low power consumption.  
1
24  
RDN  
RxD  
V
CC  
2
3
4
5
6
7
8
9
23  
22  
21  
20  
19  
18  
17  
16  
WRN  
TxD  
MPO  
MPI  
D0  
D1  
D2  
D3  
D4  
D5  
D6  
The operating speed of the receiver and transmitter can be selected  
independently as one of 18 fixed baud rates, a 16X clock derived  
from a programmable counter/timer, or an external 1X or 16X clock.  
The baud rate generator and counter/timer can operate directly from  
a crystal or from external clock inputs. The ability to independently  
program the operating speed of the receiver and transmitter make  
the UART particularly attractive for dual-speed channel applications  
such as clustered terminal systems.  
N24  
AND  
D24  
A2  
A1  
PACKAGES  
A0  
X1/CLK  
X2 10  
11  
15 D7  
14  
The receiver is quadruple buffered to minimize the potential of  
receiver overrun or to reduce interrupt overhead in interrupt driven  
systems. In addition, a handshaking capability is provided to disable  
a remote UART transmitter when the receiver buffer is full.  
RESET  
CEN  
13  
GND 12  
INTRN  
The UART provides a power-down mode in which the oscillator is  
frozen but the register contents are stored. This results in reduced  
power consumption on the order of several magnitudes.  
4
1
26  
5
25  
The UART is fully TTL compatible and operates from a single +5V  
power supply.  
A28  
PACKAGE  
11  
19  
FEATURES  
12  
18  
• Full-duplex asynchronous receiver/transmitter  
Pin  
Symbol  
Pin  
Symbol  
• Quadruple buffered receiver data register  
1
2
3
4
5
6
7
8
V
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
GND  
INTRN  
CEN  
D7  
D6  
D5  
D4  
D3  
NC  
D2  
D1  
NC  
D0  
WRN  
CC  
RDN  
RxD  
TxD  
MPO  
MPI  
NC  
• Programmable data format:  
– 5 to 8 data bits plus parity  
– Odd, even, no parity or force parity  
– 1, 1.5 or 2 stop bits programmable in 1/16-bit increments  
NC  
9
A2  
A1  
A0  
10  
11  
12  
13  
14  
• 16-bit programmable Counter/Timer  
X1/CLK  
• Baud rate for the receiver and transmitter selectable from:  
– 22 fixed rates: 50 to 115.2K baud  
X2  
RESET  
SD00122  
– Non-standard rates to 115.2 kb  
Figure 1. Pin Configurations  
– Non-standard user-defined rate derived from programmable  
timer/ counter  
• Single interrupt output with seven maskable interrupting  
– External 1X or 16X clock  
conditions  
• Parity, framing, and overrun detection  
• False start bit detection  
• On-chip crystal oscillator  
• Low power mode  
• Line break detection and generation  
• TTL compatible  
• Programmable channel mode  
– Normal (full-duplex)  
– Automatic echo  
• Single +5V power supply  
• Commercial (0°C to +70°C) and industrial (-40°C to +85°C)  
temperature versions available  
– Local loopback  
• SOL, PLCC and 300 mil wide DIP packages available  
– Remote Loopback  
• Multi-function programmable 16-bit counter/timer  
2
2006 Aug 04  
1234567...25

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