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Semiconductor, Inc.
FEATURES
• 5V Operation
• Full duplex asynchronous receiver and
transmitter
• Easily interfaces to most popular
microprocessors
• Adds or deletes standard asynchronous communication bits (start, stop, and parity ) to or
from a serial data stream
• Independently controlled transmitter, receiver,
line status, and data set interrupts
• Programmable baud rate generator allows
division of any input clock by 1 to (2
16
-1) and
generates the internal 16 x clock
• Independent receiver clock input
• MODEM control functions (CTS, RTS, DSR,
DTR, RI, and DCD)
• Fully programmable serial interface characteris
tics:
- 5, 6, 7, or 8 bit characters
- Even, odd, or no-parity bit generation and
detection
- 1, 1.5, or 2 stop bit generation
- Baud generation (DC to 56k baud)
• False start bit detection
PIN CONFIGURATION
• Complete status reporting capabilities
• Tri-State® TTL drive capabilities for bi-direc
tional data bus and control bus
• Line break generation and detection
• Internal diagnostic capabilities:
- Loopback controls for communications link fault
isolation
- Break, parity overrun, and framing error simulation
• Fully prioritized interrupt systems controls
DESCRIPTION
The Epic Ei16C450 Universal Asynchronous Receiver
Transmitter (UART) is a CMOS-VLSI communication
device in a single package.
The UART performs serial to parallel conversion
on data characters received from a peripheral
device or a MODEM, and parallel-to-serial
conversions on data characters received from the
CPU. The CPU can read the complete status of the
UART at any time during the functional operation.
Status information reported includes the type and condition of the transfer operation being performed by the
UART, as well as any error conditions (parity, overrun,
framing, or break detect).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
E
i
1
6
C
4
5
0
D0
D1
D2
D3
D4
D5
D6
D7
RCLK
SIN
SOUT
CS0
CS1
CS2•
BAUDOUT•
XTAL1
XTAL2
DOSTR•
DOSTR
VSS
VCC
RI•
DCD•
DSR•
CTS•
MR
OUT1•
DTR•
RTS•
OUT2•
INTRPT
NC
A0
A1
A2
ADS•
CSOUT
DDIS
DISTR
DISTR•
39
38
37
36
35
34
33
32
31
30
29
7
8
9
10
11
12
13
14
15
16
17
D5
D6
D7
RCLK
SIN
NC
SOUT
CS0
CS1
CS2•
BAUDOUT•
MR
OUT1•
DTR•
RTS•
OUT2•
NC
INTRPT
NC
A0
A1
A2
XTAL1
XTAL2
DOSTR•
DOSTR
VSS
NC
DISTR•
DISTR
DDIS
CSOUT
ADS•
D4D3D2D1D0NCVCC
RI•
DCD•
CDSR•
CTS•
1819202122232425262728
65432
1
4443424140
Ei16C450
Ei16C450
UART
40-PIN DIP
44-PIN PLCC
36 N.C.
35 RESET
34 OP1
•
33 DTR
•
32 RTS
•
31 OP2
•
30 INT
29 N.C.
28 A0
27 A1
26 A2
25 N.C.
N.C. 1
D5 2
D6 3
D7 4
RCLK 5
N.C. 6
RX 7
TX 8
CS0 9
CS1 10
CS2
•
11
BAUDOUT
•
12
48 N.C.
47 D4
46 D3
45 D2
44 D1
43 D0
42 VCC
41 RI
40 DCD
•
39 DSR •38 CTS •37 N.C.
N.C. 13
XTAL1 14
XTAL2 15
IOW
•
16
IOW
•
17
GND 18
IOR
•
19
IOR 20
N.C. 21
DDIS
•
22
CSOUT 23
AS
•
24
48-PIN TQFP
Ei16C450
Part Numbers May Be Marked With "IMP" or "Ei."
For additional information, contact IMP, Inc. at 408.432.9100 or visit www.impweb.com
IMP, Inc. acquired Epic products on January 26, 2001. (see press release at http://www.impweb.com/PRESS/PR012601.htm)
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