ST16654 Datasheet, PDF (1/49 Pages) Exar Corporation – QUAD UART WITH 64-BYTE FIFO AND INFRARED (IrDA) ENCODER/DECODER

ST16C654/654D
QUAD UART WITH 64-BYTE FIFO AND
INFRARED (IrDA) ENCODER/DECODER
DESCRIPTION
The ST16C654 *¹ is a universal asynchronous receiver and transmitter (UART) with a dual foot print interface
compatible with the ST16C554 and ST68C554. The 654 is an enhanced UART with 64 byte FIFOs, automatic
hardware/software flow control, and data rates up to 1.5Mbps. Onboard status registers provide the user with error
indications and operational status, modem interface control. System interrupts may be tailored to meet user
requirements. An internal loopback capability allows onboard diagnostics. The 654 is available in 64 pin TQFP,
68 pin PLCC, and 100 pin QFP packages. The 64 pin package offers the 16 interface mode which is compatible
with the industry standard ST16C554. The 68 and 100 pin packages offer an additional 68 mode which allows easy
integration with Motorola, and other popular microprocessors. The ST16C654CQ64 (64 pin) offers three state
interrupt control while the ST16C654DCQ64 provides constant active interrupt outputs. The 64 pin devices do
not offer TXRDY/RXRDY outputs or the default clock select option (CLKSEL). The 100 pin packages offer faster
channel status access by providing separate outputs for TXRDY and RXRDY, offer separate Infrared TX outputs
and a musical instrument clock input (MIDICLK). The 654 combines the package interface modes of the 16C454/
554 and 68/C454/554 series on a single integrated chip.
FEATURES
· Compatibility with the Industry Standard
ST16C454/554, ST68C454/554, TL16C554
· 1.5 Mbps transmit/receive operation (24MHz)
· 64 byte transmit FIFO
· 64 byte receive FIFO with error flags
· Automatic software/hardware flow control
· Programmable Xon/Xoff characters
· Independent transmit and receive control
· Software selectable Baud Rate Generator pre-
scaleable clock rates of 1X, 4X.
· Four selectable Transmit/Receive FIFO interrupt
trigger levels
· Standard modem interface or infrared IrDA en-
coder/decoder interface
· Software flow control turned off optionally by any
(Xon) RX character
· Independent MIDI interface on 100 pin packages
· 100 pin packages offer internal register FIFO
monitoring and separate IrDA TX outputs
· Sleep mode ( 200mA stand-by)
-DSRA 10
-CTSA 11
-DTRA 12
VCC 13
-RTSA 14
INTA 15
-CSA 16
TXA 17
-IOW 18
TXB 19
-CSB 20
INTB 21
-RTSB 22
GND 23
-DTRB 24
-CTSB 25
-DSRB 26
PLCC Package
ST16C654CJ68
16 MODE
60 -DSRD
59 -CTSD
58 -DTRD
57 GND
56 -RTSD
55 INTD
54 -CSD
53 TXD
52 -IOR
51 TXC
50 -CSC
49 INTC
48 -RTSC
47 VCC
46 -DTRC
45 -CTSC
44 -DSRC
ORDERING INFORMATION
Part number
Pins Package Operating temperature
ST16C654CJ68 68 PLCC
0° C to + 70° C
ST16C654CQ64 64 TQFP
0° C to + 70° C
ST16C654DCQ64 64 TQFP
0° C to + 70° C
ST16C654CQ100 100 QFP
0° C to + 70° C
Part number
Pins Package Operating temperature
ST16C654IJ68 68 PLCC
-40° C to + 85° C
ST16C654IQ64 64 TQFP
-40° C to + 85° C
ST16C654DIQ64 64 TQFP
-40° C to + 85° C
ST16C654IQ100 100 QFP
-40° C to + 85° C
Note *1: Patent Pending
Rev. 4.10
5-65