ST16C554/554D
ST68C554
QUAD UART WITH 16-BYTE FIFOS
DESCRIPTION
The ST16C554D is a universal asynchronous receiver
and transmitter (UART) with a dual foot print interface.
The 554D is an enhanced UART with 16 byte FIFOs,
receive trigger levels 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 554D is available in
64 pin TQFP, and 68 pin PLCC packages. The 68 pin
PLCC package offer an additional 68 mode which
allows easy integration with Motorola, and other popu-
lar microprocessors. The ST16C554CQ64 (64 pin)
offers three state interrupt control while the
ST16C554DCQ64 provides constant active interrupt
outputs. The 64 pin devices do not offer TXRDY/
RXRDY outputs. The 554D combines the package
interface modes of the 16C554 and 68C554 series on
a single integrated chip.
PLCC Package
INTSEL
-CDD
61
60
59
58
57
56
55
54
-CDA
GND
VCC
RXD
63
RXA
-RID
62
-RIA
D7
D6
D5
D4
D3
D2
D1
67
68
66
D0
65
-DSRA
-CTSA
-DTRA
VCC
-RTSA
INTA
-CSA
TXA
-IOW
TXB
-CSB
INTB
-RTSB
GND
-DTRB
-CTSB
-DSRB
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
64
9
8
7
6
5
4
3
2
1
-DSRD
-CTSD
-DTRD
GND
-RTSD
INTD
-CSD
TXD
-IOR
TXC
-CSC
INTC
-RTSC
VCC
-DTRC
-CTSC
-DSRC
ST16C554DCJ68
16 MODE
53
52
51
50
49
48
47
46
45
44
-CDB
RXB
VCC
RXC
-RIC
-RXRDY
-TXRDY
16/-68
RESET
XTAL1
XTAL2
•
Compatibility with the Industry Standard
ST16C454, ST68C454, ST68C554, TL16C554
•
1.5 Mbps transmit/receive operation (24MHz)
•
16 byte transmit FIFO
•
16 byte receive FIFO with error flags
•
Independent transmit and receive control
•
Software selectable Baud Rate Generator
•
Four selectable Receive FIFO interrupt trigger
levels
•
Standard modem interface
ORDERING INFORMATION
Part number
ST16C554DCJ68
ST16C554DCQ64
ST16C554CQ64
ST16C554DIJ68
ST16C554DIQ64
68
64
64
68
64
Pins
PLCC
TQFP
TQFP
PLCC
TQFP
Package Operating temperature
0° C to + 70° C
0° C to + 70° C
0° C to + 70° C
-40° C to + 85° C
-40° C to + 85° C
Rev. 3.10
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
•
(510) 668-7000
•
FAX (510) 668-7017
-CDC
A2
A1
A0
GND
-RIB
FEATURES
EXAR [ EXAR CORPORATION ]
