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’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 innovASIC for more detailed information.
Intel is a registered trademark of Intel Corporation
D2
D3
RXD
GND
D4
D5
D6
D7
RXRDY
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)TXC_n
(10)WR_n
(11)CS_n
(12)CD_n
(13)RD_n
(14)
IA8251
28 Pin DIP
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
Package Pinout
D1
D0
VCC
RXC_n
DTR_n
RTS_n
DSR_n
RESET
CLK
TXD
TXEMPTY
CTS_n
SYNDET_BD
TXRDY
TXC_n
WR_n
CS_n
D6
D7
(5)D4
(6)D5
(7)
(8)
(9)
(10)
(11)
RXD
GND
(4)
(3)
28 Pin LCC
(12)
(13)
CD_n
RD_n
D2
D3
(2)
(1)
IA8251
(14)
(15)
TXRDY
RXRDY
VCC
D0
D1
(28)
(27)
(26)
(16)
(17)
(18)
CTS_n
TXEMPTY
SYNDET_BD
(25)
(24)
(23)
(22)
(21)
(20)
(19)
RXC_n
DTR_n
RTS_n
DSR_n
RESET
CLK
TXD
Copyright 1999, InnovASIC Inc.
Customer Specific IC Solutions
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
RESET
CLK
CD_n
RD_n
WR_n
CS_n
DSR_n
DTR_n
CTS_n
RTS_n
DATA BUS
BUFFER
READ/WRITE
CONTROL
LOGIC
MODEM
CONTROL
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER (4)
GROUP B
PORT C
LOWER
(4)
TXD
TXRDY
TXEMPTY
TXC_n
RXD
Copyright 1999, InnovASIC Inc.
Customer Specific IC Solutions
GROUP B
PORT B
(8)
RXRDY
RXC_n
SYNDET_BD
Page 3 of 4
IA8251 Advanced Information Sheet
Programmable Communication Interface
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 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
innovASIC
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 innovASIC for other package and processing options.
Copyright 1999, InnovASIC Inc.
Customer Specific IC Solutions
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