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| Page 1 of 4 IA8255 Advanced Information Sheet Programmable Peripheral Interface Adapter FEATURES * * * * * * Form, Fit, and Function Compatible with the Intel(R) 8255A and Harris(c) 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' 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 Harris is a copyright trademark of Harris Corporation Package Pinout N. C. PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA2 PA1 PA0 RD_n CS_n GND A1 A0 PC7 PC6 PC5 PC4 PC0 PC1 PC2 PC3 PB0 PB1 PB2 (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) PA7 (41) IA8255 40 Pin DIP (39) (38) (37) (36) (35) (34) (33) (32) (31) (30) (29) (28) (27) (26) (25) (24) (23) (22) (21) PA5 PA6 (6) (5) (4) (3) (2) (1) (44) (43) (42) WR_n RESET D0 D1 D2 D3 D4 D5 D6 D7 VCC PB7 PB6 (40) PA7 CS_n GND A1 A0 PC7 N. C. PC6 PC5 PC4 PC0 PC1 RD_n PA3 (1) (40) PA4 WR_n (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (39) (38) RESET D0 D1 D2 D3 N. C. D4 D5 D6 D7 VCC IA8255 44 Pin LCC (37) (36) (35) (34) (33) (32) (31) (30) (29) PB0 PB1 PB2 PB3 PB4 PB5 PB6 PC2 PC3 PB4 PB3 Copyright (c) 1999, InnovASIC Inc. Customer Specific IC Solutions N. C. PB7 PB5 Page 2 of 4 IA8255 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 8 BIT INTERNAL DATA BUS D7:D0 DATA BUS BUFFER 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 (c) 1999, InnovASIC Inc. Customer Specific IC Solutions Page 3 of 4 IA8255 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 (c) 1999, InnovASIC Inc. Customer Specific IC Solutions Page 4 of 4 IA8255 Advanced Information Sheet Programmable Peripheral Interface Adapter 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 (c) 1999, InnovASIC Inc. Customer Specific IC Solutions |
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