IMP16C554
Data Communications
Quad Universal Asynchronous
Receiver/Transmitter (UART)
with FIFO's
Description
The IMP16C554 is a universal asynchronous receiver and
transmitter with 16 byte transmit and receive FIFO. A
Key Features
programmable baud rate generator is provided to select
transmit and receive clock rates from 50Hz to 1.5MHz.
The IMP16C554 is an improved version of the IMP16C550
ꢀ
16 byte receive FIFO with error flags
UART with higher operating speed and lower access time. ꢀ
The IMP16C554 on board status registers provides the
Modem control signal (CTS*, RTS*, DSR*, DTR*,
RI* ,CD*)
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 ꢀ
Programmable character lengths(5,6,7,8)
Even, odd, or no parity bit generation and detection
Status report register
Independent transmit and receive control
TLL compatible inputs. outputs
IMP16C554 provides internal loop-back capability for on
board diagnostic testing.
ꢀ
ꢀ
ꢀ
Software compatible with Ei8250, 1Ei16C550
460.8kHz transmit/receive operation with 7.372
MHz crystal or external clock source
The IMP16C554 is fabricated in an advanced 1.2u CMOS
process to achieve low drain power and high speed
requirements.
Pin Configuration
DSRD•
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
DSRA•
CTSA•
DTRA•
VCC
RTSA•
INTA
CSA•
TXA
IOW•
TXB
CSB•
INTB
RTSB•
GND
DTRB
CTSD•
1
2
3
4
5
6
7
8
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
DSRD•
CTSD•
DTRD•
GND
RTSD•
INTD
CSD•
TXD
IOR•
TXC
CSC•
INTC
RTSC•
VCC
DTRC•
CTSC•
DSRC•
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•
CTSD•
DTRD•
GND
RTSD•
INTD
CSD•
TXD
IOR•
TXC
CSC•
INTC
RTSC•
VCC
DTRC•
CTSC•
16C554
IMP
IMP 16C554
9
10
11
12
13
14
15
16
68-PIN PLCC
64-PIN QFP
1
408-432-9100/www.impweb.com
© 2002 IMP, Inc.