ST16C1551(2005) 查看數據表（PDF） - Exar Corporation
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ST16C1551 Datasheet PDF : 36 Pages
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ST16C1550/51
2.97V TO 5.5V UART WITH 16-BYTE FIFO
xr
REV. 4.2.1
NAME
28-PIN 28-PIN
PLCC PLCC
(1550) (1551)
48-PIN
TQFP
TYPE
DESCRIPTION
DTR# 23
23
32
O Data Terminal Ready or general purpose output (active low). If this pin is not
needed for modem communication, then it can be used as a general I/O. If it
is not used, leave it unconnected.
DSR# 26
26
39
I Data Set Ready input or general purpose input (active low). If this pin is not
needed for modem communication, then it can be used as a general I/O. If it
is not used, connect it to VCC.
CD# 27
27
40
I Carrier Detect input or general purpose input (active low). If this pin is not
needed for modem communication, then it can be used as a general I/O. If it
is not used, connect it to VCC.
RI#
17
16
21
ANCILLARY SIGNALS
CLK
-
12
-
I Ring Indicator input or general purpose input (active low). If this pin is not
needed for modem communication, then it can be used as a general I/O. If it
is not used, connect it to VCC.
I External Clock Input. This function is associated with 28 pin PDIP and 28 pin
PLCC packages only. An external clock must be connected to this pin to clock
the baud rate generator and internal circuitry.
XTAL1 12
-
15
I Crystal or external clock input. See Figure 4 for typical oscillator connec-
tions.
XTAL2 13
-
16
O Crystal or buffered clock output. See Figure 4 for typical oscillator connec-
tions.
RESET 24
24
33
I Reset Input (active high). When it is asserted, the UART configuration regis-
ters are reset to default values, see Table 8.
RST
-
17
22
O Reset Output (active high). This output is only available on the ST16C1551.
When IER bit-5 is a logic 0, RST will follow the logical state of the RESET pin.
When IER bit-5 is a logic 1, the user may send software (soft) resets via MCR
bit-2. Soft resets from MCR bit-2 are “ORed” with the state of the RESET pin.
VCC 28
28
41 Pwr Power supply input.
GND 15
14
19 Pwr Power supply common ground.
N.C.
-
-
1, 2, - Not connected.
10-14,
18,
24-26,
29,
35-38,
42, 44,
48
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
6
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