参数资料
型号: XR88C681CP/40-F
厂商: Exar Corporation
文件页数: 47/101页
文件大小: 0K
描述: IC UART CMOS DUAL 40PDIP
标准包装: 9
特点: *
通道数: 2,DUART
FIFO's: 1 字节,3 字节
电源电压: 4.75 V ~ 5.25 V
带并行端口:
带CMOS:
安装类型: 通孔
封装/外壳: 40-DIP(0.600",15.24mm)
供应商设备封装: 40-PDIP
包装: 管件
其它名称: 1016-1328-5
XR88C681
5
Rev. 2.11
44 PLCC
40 PDIP,
CDIP
28 PDIP
Symbol
Type
Description
14
12
9
OP1
(-RTSB)
O
Output 1 (General Purpose Output).
This output can also
be programmed to function as the active-low, “Channel B
Request-to-Send” Output (-RTSB).
15
13
OP3
(TXCB_1X)
(RXCB_1X)
(-C/T_RDY)
O
Output 3 (General Purpose Output).
This output port can
also be programmed to function as: the “Channel B Trans-
mitter 1X clock” output (TXCB_1X), the “Channel B Receiv-
er 1X clock” output (RXCB_1X), or the open drain, active-
low “Counter/Timer Ready” output (-C/T_RDY).
16
14
OP5
(-RXRDY/
-FFULL_B)
O
Output 5 (General Purpose Output Pin).
This output port
pin can also be programmed to function as the open-drain,
active-low, Channel B “Receive Ready” or “Receiver FIFO
Full” indicator output (-RXRDY_B/-FFULL_B).
17
15
OP7
(TXRDY_B)
O
Output 7. (General Purpose Output Pin).
This output port
pin can also be programmed to function as the open-drain,
active-low, “Transmitter Ready” indicator output for Channel
B (-TXRDY_B).
18
16
10
D1
I/O
Bi-Directional Data Bus.
19
17
11
D3
I/O
Bi-Directional Data Bus.
20
18
12
D5
I/O
Bi-Directional Data Bus.
21
19
13
D7
I/O
MSB of the Eight Bit Bi-Directional Data Bus.
All transfers
between the CPU and the DUART take place over this bus
(consisting of pins D0 - D7). The bus is tri-stated when the
-
CS input is “high”, except during an IACK cycle (in the Z-
Mode).
22
20
14
GND
PWR
Signal Ground.
23
NC
No Connect.
24
21
15
-
INTR
O
Interrupt Request Output (Active Low, Open Drain).
-
INTR is asserted upon the occurrence of one or more of the
chip’s maskable interrupting conditions. This signal will re-
main asserted throughout the Interrupt Service Routine and
will be negated once the condition(s) causing the Interrupt
Request has been eliminated.
25
22
16
D6
I/O
Bi-Directional Data Bus.
26
23
17
D4
I/O
Bi-Directional Data Bus.
27
24
18
D2
I/O
Bi-Directional Data Bus.
28
25
19
D0
I/O
LSB of the Eight Bit Bi-Directional Data Bus.
All transfers
between the CPU and the DUART take place over this bus.
The bus is tri-stated when the -CS input is “high”, except
during an IACK cycle (in the Z-Mode).
29
26
OP6
(-TXRDY_A)
O
Output 6 (General Purpose Output).
This output pin can
also be programmed to function as the open drain, active-
low, “Transmitter Ready” indicator output for Channel A
(-TXRDY_A).
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