
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#
PWRSAVE
XT
AL
1
XT
AL
2
IO
W
#
CD
B
#
GND
RXRDY
B
#
IO
R
#
DSRB
#
RIB#
RT
S
B
#
CT
S
B
#
16/
68#
RESET
DTRB#
DTRA#
RTSA#
OP2A#
RXRDYA#
INTA
INTB
A0
A1
A2
NC
D4
D3
D2
D1
D0
TXRD
YA#
VC
C
RI
A
#
CDA#
DSRA
#
CT
SA
#
XR16V2551
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
AL
1
XT
AL
2
R/
W#
CD
B
#
GND
RXRDY
B
#
NC
DSRB
#
RIB#
RT
S
B
#
CT
S
B
#
16/
68#
RESET#
DTRB#
DTRA#
RTSA#
OP2A#
IRQ#
NC
A0
A1
A2
NC
D4
D3
D2
D1
D0
TXRD
YA#
VC
C
RI
A
#
CDA#
DSRA
#
CT
SA
#
XR16V2551
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#
XT
A
L1
XT
AL
2
IOW
#
GND
IOR#
RT
SB#
CT
SB#
RESET
RTSA#
INTA
INTB
A0
A1
A2
D4
D3
D2
D1
D0
VC
C
CT
SA
#
XR16V2551
32-pin QFN
In 16 (Intel) Mode
28
27
26
25
18
17
PW
RSAV
E
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
XT
AL
2
R/W#
GND
VC
C
(I
O
R
#)
RT
S
B
#
CT
S
B
#
RESET# (Reset)
RTSA#
IRQ#
NC (INTB)
A0
A1
A2
D4
D3
D2
D1
D0
VCC
CT
SA#
XR16V2551
32-pin QFN
in 68 (Motorola) Mode
28
27
26
25
18
17
PW
RSAV
E
16/68#
GND
ORDERING INFORMATION
PART NUMBER
PACKAGE
OPERATING TEMPERATURE RANGE
DEVICE STATUS
XR16V2551IL-F
32-pin QFN
-40°C to +85°C
Active
XR16V2551ILTR-F
32-pin QFN
-40°C to +85°C
Active
XR16V2551IM-F
48-Lead TQFP
-40°C to +85°C
Active
XR16V2551IMTR-F
48-Lead TQFP
-40°C to +85°C
Active
XR16V2551
2
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.3
NOTE: TR = Tape and Reel, F = Green / RoHS