XR16M2551
2
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.2
FIGURE 2. PIN OUT ASSIGNMENT
ORDERING INFORMATION
PART NUMBER
PACKAGE
OPERATING TEMPERATURE RANGE
DEVICE STATUS
XR16M2551IL32
32-Pin QFN
-40°C to +85°C
Active
XR16M2551IM48
48-Lead TQFP
-40°C to +85°C
Active
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#
PWRSAVE
XT
A
L1
XT
A
L2
IOW
#
CD
B#
GND
RX
RDYB
#
IOR
#
DS
RB
#
RI
B
#
RT
SB#
CT
SB#
16
/6
8#
RESET
DTRB#
DTRA#
RTSA#
OP2A#
RXRDYA#
INTA
INTB
A0
A1
A2
CLKSEL
D4
D3
D2
D1
D0
T
X
RD
YA#
VCC
RI
A
#
CDA#
DSRA
#
CT
SA#
XR16M2551
48-pin TQFP
in 16 (Intel) Mode
VCC
NC
RXRDYA#
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#
CS#
A3
PWRSAVE
XT
A
L1
XT
A
L2
R/
W#
CD
B#
GND
RX
RDYB
#
NC
DS
RB
#
RI
B
#
RT
SB#
CT
SB#
16
/6
8#
RESET#
DTRB#
DTRA#
RTSA#
OP2A#
IRQ#
NC
A0
A1
A2
CLKSEL
D4
D3
D2
D1
D0
T
X
RD
YA#
VCC
RI
A
#
CDA#
DSRA
#
CT
SA#
XR16M2551
48-pin TQFP
in 68 (Motorola) Mode
GND
NC
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#
XTA
L1
XT
A
L2
IO
W#
GN
D
IOR
#
RT
S
B
#
CT
S
B
#
RESET
RTSA#
INTA
INTB
A0
A1
A2
D4
D3
D2
D1
D0
VCC
CT
S
A
#
XR16M2551
32-pin QFN
In 16 (Intel) Mode
28
27
26
25
18
17
PWR
S
AVE
16/68#
VCC
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
CS#
A3 (CSB#)
XT
A
L1
XTAL
2
R/
W
#
GND
V
CC
(I
OR#
)
RT
SB
#
CT
SB
#
RESET# (Reset)
RTSA#
IRQ#
NC (INTB)
A0
A1
A2
D4
D3
D2
D1
D0
VC
C
CT
S
A
#
XR16M2551
32-pin QFN
in 68 (Motorola) Mode
28
27
26
25
18
17
PW
RS
A
V
E
16/68#
GND