XR16C854IV-F Exar Corporation, XR16C854IV-F Datasheet - Page 17
![IC UART FIFO 128B QUAD 64LQFP](/photos/29/6/290652/lqfp64_sml.jpg)
XR16C854IV-F
Manufacturer Part Number
XR16C854IV-F
Description
IC UART FIFO 128B QUAD 64LQFP
Manufacturer
Exar Corporation
Type
Quad UART with 128-byte FIFOsr
Datasheet
1.XR16C854IV-F.pdf
(54 pages)
Specifications of XR16C854IV-F
Number Of Channels
4, QUART
Package / Case
64-LQFP
Features
*
Fifo's
128 Byte
Protocol
RS232, RS485
Voltage - Supply
2.97 V ~ 5.5 V
With Auto Flow Control
Yes
With Irda Encoder/decoder
Yes
With False Start Bit Detection
Yes
With Modem Control
Yes
With Cmos
Yes
Mounting Type
Surface Mount
Data Rate
2 Mbps
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.97 V
Supply Current
3 mA to 6 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 45 C
Mounting Style
SMD/SMT
Operating Supply Voltage
2.97 V to 5.5 V
No. Of Channels
4
Uart Features
Tx/Rx FIFO Counters
Supply Voltage Range
2.97V To 5.5V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
LQFP
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
1016-1276
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
XR16C854IV-F
Manufacturer:
HYNIX
Quantity:
101
Company:
Part Number:
XR16C854IV-F
Manufacturer:
Exar Corporation
Quantity:
10 000
xr
REV. 3.0.1
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see
•
•
If using the Auto RTS interrupt:
•
The 854 has a new feature that provides flow control trigger hysteresis while maintaining compatibility with the
XR16C850, ST16C650A and ST16C550 family of UARTs. With the Auto RTS function enabled, an interrupt is
generated when the receive FIFO reaches the programmed RX trigger level. The RTS# pin will not be forced
to a logic 1 (RTS off), until the receive FIFO reaches the upper limit of the hysteresis level. The RTS# pin will
return to a logic 0 after the RX FIFO is unloaded to the lower limit of the hysteresis level. Under the above
described conditions, the 854 will continue to accept data until the receive FIFO gets full. The Auto RTS
function is initiated when the RTS# output pin is asserted to a logic 0 (RTS On).
details for the Auto RTS# Hysteresis levels. Please note that this table is for programmable trigger levels only
(Table D). The hysteresis values for Tables A-C are the next higher and next lower trigger levels in Tables A-C
(See
Automatic CTS flow control is used to prevent data overrun to the remote receiver FIFO. The CTS# input is
monitored to suspend/restart the local transmitter. The auto CTS flow control feature is selected to fit specific
application requirement (see
•
If using the Auto CTS interrupt:
•
2.13
2.14
2.15
Enable auto RTS flow control using EFR bit-6.
The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
Enable auto CTS flow control using EFR bit-7.
Enable CTS interrupt through IER bit-7 (after setting EFR bit-4). The UART issues an interrupt when the
CTS# pin is de-asserted (logic 1): ISR bit-5 will be set to 1, and UART will suspend transmission as soon as
the stop bit of the character in process is shifted out. Transmission is resumed after the CTS# input is re-
asserted (logic 0), indicating more data may be sent.
Table
Auto RTS Hardware Flow Control
Auto RTS Hysteresis
Auto CTS Flow Control
11).
Figure
11):
17
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
Figure
11):
Table 15
shows the complete
XR16C854/854D