XR16C854CV EXAR [Exar Corporation], XR16C854CV Datasheet - Page 7

• Manufacturer Part Number: XR16C854CV
• Description: 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

Pin Description
xr
REV. 3.0.1
ANCILLARY SIGNALS
(RESET#)
CHCCLK
CLKSEL
RESET
16/68#
XTAL1
XTAL2
CDC#
CDD#
CDA#
CDB#
N
RIA#
RIB#
RIC#
RID#
GND
VCC
AME
64-LQFP
4, 35, 52
14, 28,
45, 61
P
64
18
31
49
63
19
30
50
25
26
21
27
IN
-
-
#
68-PLCC
6, 23, 40,
13, 47,
P
27
43
61
28
42
62
35
36
31
30
37
64
57
IN
9
8
-
#
100-QFP
10, 61,
20, 46,
71, 96
P
99
32
49
83
98
33
48
84
40
41
36
35
42
43
86
IN
#
T
Pwr 2.97V to 5.5V power supply. All input pins, except XTAL1, are 5V
Pwr Power supply common, ground.
YPE
O
I
I
I
I
I
I
UART channels A-D Carrier-Detect (active low) or general purpose
input. This input should be connected to VCC when not used.
UART channels A-D Ring-Indicator (active low) or general purpose
input. This input should be connected to VCC when not used.
Crystal or external clock input. This input is not 5V tolerant.
Crystal or buffered clock output.
Intel or Motorola Bus Select (input with internal pull-up).
When 16/68# pin is at logic 1, 16 or Intel Mode, the device will
operate in the Intel bus type of interface.
When 16/68# pin is at logic 0, 68 or Motorola mode, the device will
operate in the Motorola bus type of interface.
Motorola bus interface is not available on the 64 pin package.
Baud-Rate-Generator Input Clock Prescaler Select for channels A-
D. This input is only sampled during power up or a reset. Connect
to VCC for divide by 1 and GND for divide by 4. MCR[7] can over-
ride the state of this pin following a reset or initialization. See MCR
bit-7 and
This input provides the clock for UART channel C. An external
16X baud clock or the crystal oscillator’s output, XTAL2, must be
connected to this pin for normal operation. This input may also be
used with MIDI (Musical Instrument Digital Interface) applications
when an external MIDI clock is provided.
When 16/68# pin is at logic 1 for Intel bus interface, this input
becomes the Reset pin (active high). In this case, a 40 ns mini-
mum logic 1 pulse on this pin will reset the internal registers and all
outputs. The UART transmitter output will be held at logic 1, the
receiver input will be ignored and outputs are reset during reset
period
interface, this input becomes Reset# pin (active low). This pin
functions similarly, but instead of a logic 1 pulse, a 40 ns minimum
logic 0 pulse will reset the internal registers and outputs.
Motorola bus interface is not available on the 64 pin package.
tolerant.
7
(Table
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
Figure 6
18). When 16/68# pin is at a logic 0 for Motorola bus
in the Baud Rate Generator section.
D
ESCRIPTION
XR16C854/854D