xr16v554 Exar Corporation, xr16v554 Datasheet - Page 4

• Manufacturer Part Number: xr16v554
• Description: 2.25v To 3.6v Quad Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

Pin Description
XR16V554/554D
2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
PIN DESCRIPTIONS
ORDERING INFORMATION
DATA BUS INTERFACE
(R/W#)
(VCC)
CSA#
(CS#)
N
IOW#
IOR#
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
AME
XR16V554IV80
XR16V554DIV
P
XR16V554IV
XR16V554IL
XR16V554IJ
ART
48-QFN
P
N
15
16
17
46
45
44
43
42
41
40
39
29
IN
7
5
UMBER
#
64-LQFP
P
22
23
24
60
59
58
57
56
55
54
53
40
IN
9
7
#
68-PLCC
P
32
33
34
68
67
66
52
18
16
IN
5
4
3
2
1
#
68-Lead PLCC
64-Lead LQFP
64-Lead LQFP
80-Lead LQFP
48-pin QFN
80-LQFP
P
P
ACKAGE
46
47
48
15
14
13
12
11
70
31
28
IN
9
8
7
#
T
4
I/O
YPE
I
I
I
I
Address data lines [2:0]. These 3 address lines select
one of the internal registers in UART channel A-D dur-
ing a data bus transaction.
Data bus lines [7:0] (bidirectional).
When 16/68# pin is HIGH, the Intel bus interface is
selected and this input becomes read strobe (active
low). The falling edge instigates an internal read cycle
and retrieves the data byte from an internal register
pointed by the address lines [A2:A0], puts the data byte
on the data bus to allow the host processor to read it on
the rising edge.
When 16/68# pin is LOW, the Motorola bus interface is
selected and this input is not used and should be con-
nected to VCC.
When 16/68# pin is HIGH, it selects Intel bus interface
and this input becomes write strobe (active low). The
falling edge instigates the internal write cycle and the
rising edge transfers the data byte on the data bus to
an internal register pointed by the address lines.
When 16/68# pin is LOW, the Motorola bus interface is
selected and this input becomes read (HIGH) and write
(LOW) signal.
When 16/68# pin is HIGH, this input is chip select A
(active low) to enable channel A in the device.
When 16/68# pin is LOW, this input becomes the chip
select (active low) for the Motorola bus interface.
O
PERATING
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
R
ANGE
T
EMPERATURE
D
ESCRIPTION
D
EVICE
Active
Active
Active
Active
Active
REV. 1.0.2
S
TATUS