Page 1 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Copyright
1999, InnovASIC Inc.
Customer Specific IC Solutions
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 innov
ASIC
's innovative new f
3
Program to provide industry with parts that
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 innov
ASIC
for more detailed information.
Intel is a registered trademark of Intel Corporation
Package Pinout
(6)
(1)
(2)
(3)
(4)
(5)
(7)
(8)
(9)
TXC_n
(10)
WR_n
(11)
CS_n
(12)
CD_n
(13)
RD_n
(14)
28 Pin DIP
IA8251
CLK
TXD
TXEMPTY
CTS_n
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
RXRDY
SYNDET_BD
TXRDY
DSR_n
RESET
DTR_n
RTS_n
VCC
RXC_n
D1
D0
D5
D2
D3
RXD
GND
D4
D6
D7
D7
D6
TXC_n
WR_n
CS_n
CD_n
VCC
D0
D2
RXD
RXRDY
SYNDET_BD
TXEMPTY
28 Pin LCC
IA8251
(8)
(5)
D4
(6)
D5
(7)
(9)
(10)
(11)
RESET
DSR_n
RTS_n
RXC_n
(4)
(3)
(2)
(1)
(28)
(27)
(26)
(22)
(25)
(24)
(23)
(21)
(20)
(19)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
D1
D3
GND
RD_n
TXRDY
CTS_n
TXD
CLK
DTR_n
Page 2 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Copyright
1999, InnovASIC Inc.
Customer Specific IC Solutions
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
DATA BUS
BUFFER
READ/WRITE
CONTROL
LOGIC
MODEM
CONTROL
INTERNAL DATA
BUS
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER (4)
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
DSR_n
DTR_n
CS_n
RESET
RD_n
WR_n
D7:D0
CLK
CD_n
CTS_n
RTS_n
RXRDY
RXC_n
SYNDET_BD
RXD
TXRDY
TXEMPTY
TXC_n
TXD
Page 3 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Copyright
1999, InnovASIC Inc.
Customer Specific IC Solutions
Qualification Levels
Table 1
Part Number
Environmental/ Qual Level
IA8251-PDW28C
Commercial
IA8251-PLC28C
Commercial
IA8251-PDW28I
Industrial
IA8251-PLC28I
Industrial
The following diagram depicts the innov
ASIC
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
innov
ASIC
Designator
Page 4 of 4
IA8251
Advanced Information
Sheet
Programmable Communication Interface
Copyright
1999, InnovASIC Inc.
Customer Specific IC Solutions
Package Designator Table
Package Type
innov
ASIC
Designator
Ceramic side brazed Dual In-line
CDB
Cerdip with window
CDW
Ceramic leaded chip carrier
CLC
Cerdip without window
CD
Ceramic leadless chip carrier
CLL
PLCC
PLC
Plastic DIP standard (300 mil)
PD
Plastic DIP standard (600 mil)
PDW
Plastic metric quad flat pack
PQF
Plastic thin quad flat pack
PTQ
Skinny Cerdip
CDS
Small outline plastic gull-wing(150 mil body)
PSO
Small outline medium plastic gull-wing (207 mil body)
PSM
Small outline narrow plastic gull wing (150 mil body)
PSN
Small outline wide plastic gull wing (300 mil body)
PSW
Skinny Plastic Dip
PDS
Shrink small outline plastic (5.3mm .208 body)
PS
Thin shrink small outline plastic
PTS
Small outline large plastic gull wing (330 mil body)
PSL
Thin small outline plastic gull-wing (8 x 20mm) [TSOP]
PST
PGA
CPGA
BGA
CBGA
Contact innov
ASIC
for other package and processing options.
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