Page 1 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
FEATURES
•
•
•
•
•
•
•
Form, Fit, and Function Compatible with the Intel
®
8251A
Packaging options available: 28 Pin Plastic Dip or 28 Pin Plastic Leaded
Chip Carrier
Synchronous and Asynchronous Operation
Full Duplex, Double-Buffered Transmitter and Receiver
Programmable Word Length, Stop Bits, and Parity
Offers Divide-by-1, -16, or –64 Mode
Includes:
-
Error Detection
-
False Start Detection
-
Automatic Break Detection and Handling
-
Internal and External Sync Character Detection
The IA8251 uses
innovASIC’
innovative new
f
3
Program
to provide industry with parts that
s
other vendors have declared obsolete. By specifying parts through this program a customer is
assured of never having a component become obsolete again. This advanced information sheet
assumes the original part has been designed in, and so provides a summary of capabilities only. For
new designs contact
innovASIC
for more detailed information.
Intel is a registered trademark of Intel Corporation
Package Pinout
GND
RXD
D2
D3
RXD
GND
D4
D5
D6
D7
TXC_n
WR_n
CS_n
CD_n
RD_n
RXRDY
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
IA8251
28 Pin DIP
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
D1
D0
(28)
(27)
RXC_n
DTR_n
RTS_n
DSR_n
RESET
CLK
TXD
TXEMPTY
CTS_n
D4
D5
D6
D7
TXC_n
WR_n
CS_n
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(26)
(4)
(3)
(2)
(1)
VCC
VCC
D3
D2
D1
D0
IA8251
28 Pin LCC
(25)
(24)
(23)
(22)
(21)
(20)
RXC_n
DTR_n
RTS_n
DSR_n
RESET
CLK
TXD
(14)
(15)
(16)
(17)
CD_n
RD_n
SYNDET_BD
CTS_n
TXRDY
Copyright
©
1999, InnovASIC Inc.
Customer Specific IC Solutions
TXEMPTY
RXRDY
SYNDET_BD
TXRDY
(18)
(19)
Page 2 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
The IA8251 provides an interface between a microprocessor and a serial communications channel.
The IA8251 receives and transmits data in a variety of configurations including 7- or 8-bit data
words, with odd, even , or no parity, and 1 or 2 stop bits. The transmitter and receiver can be
designed for synchronous or asynchronous operation.
A block diagram is shown in Figure 1.
Functional Block Diagram
Figure 1
INTERNAL DATA
BUS
D7:D0
DATA BUS
BUFFER
GROUP A
PORT A
(8)
TXD
RESET
CLK
CD_n
RD_n
WR_n
CS_n
READ/WRITE
CONTROL
LOGIC
TXRDY
GROUP A
PORT C
UPPER (4)
TXEMPTY
TXC_n
DSR_n
DTR_n
CTS_n
RTS_n
MODEM
CONTROL
GROUP B
PORT C
LOWER
(4)
RXD
RXRDY
GROUP B
PORT B
(8)
RXC_n
SYNDET_BD
Copyright
©
1999, InnovASIC Inc.
Customer Specific IC Solutions
Page 3 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Table 1
Part Number
IA8251-PDW28C
IA8251-PLC28C
IA8251-PDW28I
IA8251-PLC28I
Qualification Levels
Environmental/ Qual Level
Commercial
Commercial
Industrial
Industrial
The following diagram depicts
the
innovASIC
Product Identification Number.
IAXXXXX-PPPPNNNT/SP
Special Processing:
S = Space
Q = MIL-STD-883
Temperature:
C = Commercial
I = Industrial
M = Military
Number of Leads
Package Type:
Per Package Designator Table
IC Base Number
innovASIC Designator
Copyright
©
1999, InnovASIC Inc.
Customer Specific IC Solutions
Page 4 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Package Designator Table
Package Type
Ceramic side brazed Dual In-line
Cerdip with window
Ceramic leaded chip carrier
Cerdip without window
Ceramic leadless chip carrier
PLCC
Plastic DIP standard (300 mil)
Plastic DIP standard (600 mil)
Plastic metric quad flat pack
Plastic thin quad flat pack
Skinny Cerdip
Small outline plastic gull-wing(150 mil body)
Small outline medium plastic gull-wing (207 mil body)
Small outline narrow plastic gull wing (150 mil body)
Small outline wide plastic gull wing (300 mil body)
Skinny Plastic Dip
Shrink small outline plastic (5.3mm .208 body)
Thin shrink small outline plastic
Small outline large plastic gull wing (330 mil body)
Thin small outline plastic gull-wing (8 x 20mm) [TSOP]
PGA
BGA
innovASIC
Designator
CDB
CDW
CLC
CD
CLL
PLC
PD
PDW
PQF
PTQ
CDS
PSO
PSM
PSN
PSW
PDS
PS
PTS
PSL
PST
CPGA
CBGA
Contact
innovASIC
for other package and processing options.
Copyright
©
1999, InnovASIC Inc.
Customer Specific IC Solutions
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