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ST16C1551CQ48 Fiches technique(PDF) 6 Page - Exar Corporation

No de pièce ST16C1551CQ48
Description  2.97V TO 5.5V UART WITH 16-BYTE FIFO
Download  36 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

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ST16C1550/51
xr
2.97V TO 5.5V UART WITH 16-BYTE FIFO
REV. 4.2.1
6
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
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
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.
ANCILLARY SIGNALS
CLK
-
12
-
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,
10-14,
18,
24-26,
29,
35-38,
42, 44,
48
-
Not connected.
NAME
28-PIN
PLCC
(1550)
28-PIN
PLCC
(1551)
48-PIN
TQFP
TYPE
DESCRIPTION


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