DS2251T View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
DS2251T Datasheet PDF : 22 Pages
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PIN ASSIGNMENT
PIN NAME
PIN
1
P1.0
19
2
P1.1
20
3
P1.2
21
4
P1.3
22
5
P1.4
23
6
P1.5
24
7
P1.6
25
8
P1.7
26
9
RST
27
10 P3.0/RXD
28
11 P3.1/TXD
29
12 P3.2/ INT0
30
13 P3.3/ INT1
31
14 P3.4/T0
32
15 P3.5/T1
33
16 P3.6/ WR
34
17 P3.7/ RD
35
18 XTAL1
36
NAME
XTAL2
GND
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
PSEN
ALE
PROG
P0.7
P0.6
P0.5
P0.4
P0.3
PIN NAME
37
P0.2
38
P0.1
39
P0.0
40
VCC
41
BA0
42
BA1
43
BA2
44
BA3
45
BA4
46
BA5
47
BA6
48
BA7
49
BA8
50
BA9
51
BA10
52
BA11
53
BA12
54
BA13
DS2251T
PIN NAME
55
INTB
56
BD0
57
BD1
58
BD2
59
BD3
60
BD4
61
BD5
62
BD6
63
BD7
64
R/ W
65
PF
66
PE3
67
PE4
68
INTP
69
INTA
70 SQW
71
VRST
72 BA15
PIN DESCRIPTION
PIN
DESCRIPTION
P0.0–P0.7. General-purpose I/O Port 0. This port is open-drain and cannot drive a logic 1. It
39–32 requires external pullups. Port 0 is also the multiplexed Expanded Address/Data bus. When
used in this mode, it does not require pullups.
1–8 P1.0–P1.7. General-purpose I/O Port 1.
21–28
P2.0–P2.7. General-purpose I/O Port 2. Also serves as the MSB of the Expanded Address
bus.
10
P3.0/RXD. General-purpose I/O port pin 3.0. Also serves as the receive signal for the on-
board UART. This pin should NOT be connected directly to a PC COM port.
11
P3.1/TXD. General-purpose I/O port pin 3.1. Also serves as the transmit signal for the on-
board UART. This pin should NOT be connected directly to a PC COM port.
12
P3.2/ INT0 . General-purpose I/O port pin 3.2. Also serves as the active low External
Interrupt 0.
13 P3.3/ INT1 . General-purpose I/O port pin 3.3. Also serves as the active low External
Interrupt 1.
14 P3.4/T0. General-purpose I/O port pin 3.4. Also serves as the Timer 0 input.
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