11
Semiconductor, Inc.
FEATURES
5V Operation
Pin to pin and functional compatible to
16C454
16 byte transmit FIFO
16 byte receive FIFO with error flags
Modem control signals ( CTS, RTS,
DSR, DTR, RI, CD)
Programmable character lengths (5, 6, 7, 8)
Even, odd, or no parity bit generation and
detection
Status report register
Independent transmit and receive control
TTL compatible inputs, outputs
Software compatible with 8250 and
Ei16C550
460.8 kHz transmit/receive operation with
7.372 MHz crystal or external clock source
Ei16C554
QUAD UART
DESCRIPTION
The Ei16C554 is Universal Asynchronous Receiver
and Transmitter with 16 byte transmit and receive
FIFO. A programmable baud rate generator is provided
to select transmit and receive clock rates from 50 Hz to
1.5MHz.
The Ei16C554 is an improved version of the Ei16C550
UART with higher operating speed and lower access
time. The Ei16C554 on board status registers provides
the error conditions, type and status of the transfer
operation being performed. Included is complete
MODEM control capability, and a processor interrupt
system that may be software tailored to the user?s
requirements. The Ei16C554 provides internal loop-
back capability for on board diagnostic testing.
The Ei16C554 is fabricated in an advanced CMOS
process to achieve low drain power and high speed
requirements.
PIN CONFIGURATION
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
DSRA
CTSA
DTRA
VCC
RTSA
INTA
CSA
TXA
IOW
TXB
CSB
INTB
RTSB
GND
DTRB
CTSD
DSRB
DSRA*
CTSA*
DTRA*
VCC
RTSA*
INTA
CSA*
TXA
IOW*
TXB
CSB*
INTB
RTSB*
GND
DTRB
CTSD*
DSRD
CTSD
DTRD
GND
RTSD
INTD
CSD
TXD
IOR
TXC
CSC
INTC
RTSC
VCC
DTRC
CTSC
DSRC
DSRD*
CTSD*
DTRD*
GND
RTSD*
INTD
CSD*
TXD
IOR*
TXC
CSC*
INTC
RTSC*
VCC
DTRC*
CTSC*
CDB
RIB
RXB
VCC
NC
A2
A1
A0
XT
AL1
XT
AL2
ERSET
RXRDY
TXRD
GND
RXC
RIC
CDC
DSRB*
CDB*
RIB*
RXB*
VCC
A2
A1
A0
XT
AL1
XT
AL2
RESET
GND
RXC
RIC*
CDC*
DSRC*
CDA
RIA
RXA
GND
D7
D6
D5
D4
D3
D2
D1
D0
INTSEL
VCC
RXD
RID
CDO
CDA*
RIA*
RXA
GND
D7
D6
D5
D4
D3
D2
D1
D0
VCC
RXD
RID*
CDD*
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
9
8
7
6
5
4
3
2
1
68
67
66
65
64
63
62
61
Ei16C554
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
Ei16C554
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
64-PIN TQFP
68-PIN PLCC
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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