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Intel 8080 manual PIN Configurations Block Diagram, PIN Names

Models: 8080

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Silicon Gate MOS 8708/8704

8192/4096 BIT ERASABLE AND ELECTRICALLY

REPROGRAMMABLE READ ONLY MEMORY

•8708 1024x8 Organization

•8704 512x8 Organization

•

Fast Programming -

• Static - No Clocks Required

 

Typ. 100 sec. For All 8K Bits

• Inputs and Outputs TTL

 

 

•

Low Power During Programming

Compatible During Both Read

• Access Time - 450 ns

and Program Modes

 

• Standard Power Supplies-

• Three-State Output- OR-Tie

Capability

+12V, ±5V

 

The Intel@8708/8704 are high speed 8192/4096 bit erasable and electrically reprogrammable ROM's (EPROM) ideally suited where fast turn around and pattern experimentation are important requirements.

The 8708/8704 are packaged in a 24 pin dual-in-line package with transparent lid. The transparent lid allows the user to ex- pose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written into the devices.

@

A pin for pin mask programmed ROM, the Intel 8308, is available for large volume production runs of systems initially using the 8708.

The 8708/8704 is fabricated with the time proven N-channel silicon gate technology.

PIN CONFIGURATIONS

 

BLOCK DIAGRAM

 

 

 

 

 

 

 

 

DATA OUTPUT

A7

 

 

24

Vee

 

 

0, Os

 

 

 

 

I

 

 

 

 

 

 

 

A6

2

 

23

As

 

 

 

As

3

 

22

 

 

 

 

A4

4

 

21

Vea

 

 

 

A3

5

87081

20

CSIWE

 

CHIP SELECT

 

 

 

 

 

CS/WE -

 

A2

6

8704

19

Voo

LOGIC

OUTPUT BUFFERS

 

 

 

A1

7

 

18

PROGRAM

 

 

 

Ao

8

 

17

Os

 

Y

 

 

 

 

 

 

 

Y GATING

01

9

 

16

07

 

DECODER

 

 

 

 

 

 

 

02

10

 

15

06

AO·Ag

 

 

03

11

 

14

Os

ADDRESS

 

 

 

INPUTS

 

 

Vss

12

 

13

04

 

X

64 X 128

 

 

 

 

 

 

 

 

 

 

 

 

DECODER

ROM ARRAY

*8704 =Vss

8708 =Ag

PIN NAMES

Ao·Ag ADDRESS INPUTS

O,·Os DATA OUTPUTS

CSIWE CHIP SElECTIWRITE ENABLE INPUT

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Page 108 Page 110
Page 109
Image 109
Intel 8080 manual PIN Configurations Block Diagram, PIN Names
Page 108 Page 110

8080 specifications

The Intel 8085 and 8080 microprocessors were groundbreaking innovations in the world of computing, paving the way for future microprocessor development and personal computing.

The Intel 8080, introduced in 1974, was an 8-bit microprocessor that played a fundamental role in the early days of personal computing. With a 16-bit address bus, it had the capability to address 64 KB of memory. Running at clock speeds of 2 MHz, the 8080 was notable for its instruction set, which included 78 instructions and 246 opcodes. It supported a range of addressing modes including direct, indirect, and register addressing. The 8080 was compatible with a variety of peripherals and played a crucial role in the development of many early computers.

The microprocessor's architecture was based on a simple and efficient design, making it accessible for hobbyists and engineers alike. It included an 8-bit accumulator, which allowed for data manipulation and storage during processing. Additionally, the 8080 featured registers like the program counter and stack pointer, which facilitated program flow control and data management. Its ability to handle interrupts also made it suitable for multitasking applications.

The Intel 8085, introduced in 1976, was an enhancement of the 8080 microprocessor. It maintained a similar architecture but included several key improvements. Notably, the 8085 had a built-in clock oscillator, simplifying system design by eliminating the need for external clock circuitry. It also featured a 5-bit control signal for status line management, which allowed for more flexible interfacing with peripheral devices. The 8085 was capable of running at speeds of up to 3 MHz and had an extended instruction set with 74 instructions.

One of the standout features of the 8085 was its support for 5 extra instructions for stack manipulation and I/O operations, which optimized the programming process. Additionally, it supported serial communication, making it suitable for interfacing with external devices. Its 16-bit address bus retained the 64 KB memory addressing capability of its predecessor.

Both the 8080 and 8085 microprocessors laid the groundwork for more advanced microprocessors in the years that followed. They demonstrated the potential of integrated circuits in computing and influenced the design and architecture of subsequent Intel microprocessors. Their legacy endures in the way they revolutionized computing, making technology accessible to a broader audience, and their influence is still felt in the design and architecture of modern microprocessors today.