FIGURE 2. PIN OUT ASSIGNMENT
48
47
46
45
44
43
42
41
40
39
38
37
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
13
14
15
16
17
18
19
20
21
22
23
24
D5
D6
D7
RXB
RXA
TXRDYB#
TXA
TXB
OP2B#
CSA#
CSB#
NC
XTAL1
XTAL2
IOW
#
CD
B
#
GN
D
RXRDYB
#
IOR
#
DSRB
#
RI
B
#
RT
SB
#
CT
SB
#
NC
RESET
DTRB#
DTRA#
RTSA#
OP2A#
RXRDYA#
INTA
INTB
A0
A1
A2
NC
D4
D3
D2
D1
D0
T
X
RDYA
#
VC
C
RI
A#
CDA#
DSRA
#
CT
S
A
#
NC
XR16L2550
48-pin TQFP
6
5
4
3
2
1
44
43
42
41
40
7
8
9
10
11
12
13
14
15
16
17
39
38
37
36
35
34
33
32
31
30
29
18
19
20
21
22
23
24
25
26
27
28
D5
D6
D7
RXB
RXA
TXRDYB#
TXA
TXB
OP2B#
CSA#
CSB#
RESET
DTRB#
DTRA#
RTSA#
OP2A#
RXRDYA#
INTA
INTB
A0
A1
A2
XT
AL
1
XT
AL
2
IO
W
#
CD
B#
GND
RX
RD
YB
#
IO
R
#
DS
RB
#
RI
B#
RT
S
B
#
CT
S
B
#
D4
D3
D2
D1
D0
TX
RD
YA
#
VC
C
RI
A#
CD
A#
DS
RA
#
CT
SA
#
XR16L2550
44-pin PLCC
32
31
30
29
1
2
3
4
5
6
7
8
24
23
22
21
20
19
11
12
13
14
15
16
9
10
D5
D6
D7
RXB
RXA
TXA
TXB
CSA#
CSB#
XT
A
L1
XTA
L2
IOW
#
GN
D
IO
R
#
RT
SB
#
CT
SB
#
RESET
RTSA#
INTA
INTB
A0
A1
A2
D4
D3
D2
D1
D0
VC
C
CT
SA
#
XR16L2550
32-pin QFN
28
27
26
25
18
17
NC
ORDERING INFORMATION
PART NUMBER
PACKAGE
OPERATING TEMPERATURE RANGE
DEVICE STATUS
XR16L2550IL
32-Lead QFN
-40°C to +85°C
Active
XR16L2550IJ
44-Lead PLCC
-40°C to +85°C
Active
XR16L2550IM
48-Lead TQFP
-40°C to +85°C
Active
XR16L2550
2
LOW VOLTAGE DUART WITH 16-BYTE FIFO
REV. 1.1.3