XR16M752 Datasheet, PDF (3/51 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 64-BYTE FIFO

REV. 1.0.2
XR16M752/XR68M752
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
ORDERING INFORMATION
PART NUMBER
XR16M752IL32
XR16M752IM48
XR68M752IL32
XR68M752IM48
PACKAGE
32-pin QFN
48-Lead TQFP
32-pin QFN
48-Lead TQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
DEVICE STATUS
Active
Active
Active
Active
PIN DESCRIPTIONS
Pin Description
NAME
32-QFN
PIN #
DATA BUS INTERFACE
A2
18
A1
19
A0
20
D7
2
D6
1
D5
32
D4
31
D3
30
D2
29
D1
28
D0
27
IOR#
14
(NC)
48-TQFP
PIN #
26
27
28
3
2
1
48
47
46
45
44
19
IOW#
12
15
(R/W#)
CSA#
7
10
(CS#)
CSB#
8
11
(A3)
TYPE
DESCRIPTION
I _{Address data lines [2:0]. These 3 address lines select one of the inter-}
nal registers in UART channel A/B during a data bus transaction.
I/O _{Data bus lines [7:0] (bidirectional).}
I _{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.
I _{When 16/68# pin is HIGH, it selects Intel bus interface and this input}
becomes write strobe (active low). The falling edge instigates the inter-
nal 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.
I _{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.
I _{When 16/68# pin is HIGH, this input is chip select B (active low) to}
enable channel B in the device.
When 16/68# pin is LOW, this input becomes address line A3 which is
used for channel selection in the Motorola bus interface. Input logic 0
selects channel A and logic 1 selects channel B.
3