Electronic Components Datasheet Search |
|
N8259A Datasheet(PDF) 2 Page - Intel Corporation |
|
N8259A Datasheet(HTML) 2 Page - Intel Corporation |
2 / 24 page 8259A Table 1 Pin Description Symbol Pin No Type Name and Function VCC 28 I SUPPLY a 5V Supply GND 14 I GROUND CS 1I CHIP SELECT A low on this pin enables RD and WR communication between the CPU and the 8259A INTA functions are independent of CS WR 2I WRITE A low on this pin when CS is low enables the 8259A to accept command words from the CPU RD 3I READ A low on this pin when CS is low enables the 8259A to release status onto the data bus for the CPU D7–D0 4–11 I O BIDIRECTIONAL DATA BUS Control status and interrupt-vector information is transferred via this bus CAS0–CAS2 12 13 15 IO CASCADE LINES The CAS lines form a private 8259A bus to control a multiple 8259A structure These pins are outputs for a master 8259A and inputs for a slave 8259A SP EN 16 IO SLAVE PROGRAMENABLE BUFFER This is a dual function pin When in the Buffered Mode it can be used as an output to control buffer transceivers (EN) When not in the buffered mode it is used as an input to designate a master (SP e 1) or slave (SP e 0) INT 17 O INTERRUPT This pin goes high whenever a valid interrupt request is asserted It is used to interrupt the CPU thus it is connected to the CPU’s interrupt pin IR0–IR7 18–25 I INTERRUPT REQUESTS Asynchronous inputs An interrupt request is executed by raising an IR input (low to high) and holding it high until it is acknowledged (Edge Triggered Mode) or just by a high level on an IR input (Level Triggered Mode) INTA 26 I INTERRUPT ACKNOWLEDGE This pin is used to enable 8259A interrupt-vector data onto the data bus by a sequence of interrupt acknowledge pulses issued by the CPU A0 27 I AO ADDRESS LINE This pin acts in conjunction with the CS WR and RD pins It is used by the 8259A to decipher various Command Words the CPU writes and status the CPU wishes to read It is typically connected to the CPU A0 address line (A1 for 8086 8088) 2 |
Similar Part No. - N8259A |
|
Similar Description - N8259A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |