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IA8255
Page 1 of 4
Advanced Information Sheet
Programmable Peripheral Interface Adapter
FEATURES
Form, Fit, and Function Compatible with the Intel® 8255A and Harris©
82C55A
Packaging options available: 40 Pin Plastic DIP or 44 Pin Plastic Leaded
Chip Carrier
24 Programmable Input/Outputs
Static Read/Write or Handshaking Modes
Direct Bit Set/Reset Capability
High Speed, No “Wait State” Operation
The IA8255 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
Harris is a copyright trademark of Harris Corporation
Package Pinout
www.DataSheet4U.com
PA3
PA2
PA1
PA0
RD_n
CS_n
GND
A1
A0
PC7
PC6
PC5
PC4
PC0
PC1
PC2
PC3
PB0
PB1
PB2
(1) IA8255
(2) 40 Pin DIP
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(40)
(39)
(38)
(37)
(36)
(35)
(34)
(33)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
PA4
PA5
PA6
PA7
WR_n
RESET
D0
D1
D2
D3
D4
D5
D6
D7
VCC
PB7
PB6
PB5
PB4
PB3
CS_n
GND
A1
A0
PC7
N. C.
PC6
PC5
PC4
PC0
PC1
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
IA8255
44 Pin LCC
(39) RESET
(38) D0
(37) D1
(36) D2
(35) D3
(34) N. C.
(33) D4
(32) D5
(31) D6
(30) D7
(29) VCC
Copyright © 1999, InnovASIC Inc.
Customer Specific IC Solutions

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IA8255
Page 2 of 4
Advanced Information Sheet
Programmable Peripheral Interface Adapter
The IA8255 is a programmable peripheral interface adapter mega-function designed to be
functionally equivalent to the Intel 8255A and Harris 82C55A devices. This function has 24 I/O
signals programmable in two groups of 12. Three modes of operation allow the following:
Basic Input/Output (Mode 0) - Port A, Port B, Port C (upper), and Port C (lower) can be
independently configured as inputs or outputs to read or hold static data. Outputs are
latched, but inputs are not latched.
Strobed Input/Output (Mode 1) - Port A and Port B can be independently configured as
strobed input or output buses. Signals from Port C are dedicated as control signals for data
handshaking.
Bidirectional Bus (Mode 2) - Port A can also be configured as a bidirectional bus, with the
majority of Port C providing the control signals. In this case, Port B is still capable of
implementing one of the previous described modes.
A block diagram is shown in Figure 1.
Functional Block Diagram
Figure 1
D7:D0
DATA BUS
BUFFER
8 BIT INTERNAL
DATA BUS
GROUP A
PORT A
(8)
I/O
PA7:PA0
GROUP A
CONTROL
GROUP A
PORT C
UPPER (4)
I/O
PC7:PC4
RESET
CS_n
RD_n
WR_n
A0
A1
CONTROL
REGISTER AND
LOGIC
GROUP B
CONTROL
GROUP B
PORT C
LOWER
(4)
I/O
PC3:PC0
GROUP B
PORT B
(8)
I/O
PB7:PB0
Copyright © 1999, InnovASIC Inc.
Customer Specific IC Solutions

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IA8255
Page 3 of 4
Advanced Information Sheet
Programmable Peripheral Interface Adapter
Table 1
Part Number
IA8255-PDW40C
IA8255-PLC44C
IA8255-PDW40I
IA8255-PLC44I
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