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Intel 8080 manual Silicon Gate MOS

Models: 8080

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Silicon Gate MOS 8308

8192 BIT STATIC MOS READ ONLY MEMORY

Organization --1024 Words x 8 Bits

•Fast Access - 450 ns

•Directly Compatible with 8080 CPU at Maximl)m Processor Speed

•Two Chip Select Inputs for Easy Memory Expansion

•Directly TTL Compatible - All Inputs and Outputs

•Three State Output - OR-Ti~Capability

•·Fully Decoded

•Standard Power Supplies

+12V DC, ±5V DC

The Intel® 8308 is an 8,192 bit static MOS mask prog~ammable Read Only Memory organized as 1024 words by ~-bi~s.This ROM is designed for 8080 microcomputer system applications where high performance, large bit storage, and simple inter- facing are important design objectives. The inputs and outputs are fully TTL compatible.

A pin for pin compatible electrically programmed erasable ROM, the Intel® 8708, is available for system development and small quantity production use.

Two Chip Selects are provided - CS1 which is negative true, and CS2/CS2 which may be programmed either negative or positive true at the mask level.

The 8308 read only memory is fabricated with N-channel silicon gate technology. This technology provides the designer with high performance, easy-to-use MOS circuits.

PIN CONFIGURATION

 

 

BLOCK DIAGRAM

 

Vee

 

DATA OUT 1 DATA OUT 8

A7

 

 

 

A6

As

 

CS1--'

OUTPUT

 

 

 

 

 

 

 

A5

Ag

CS2

/CS2. - ...

BUFFERS

 

 

 

 

A4

Va8

 

 

 

A3

CSl

 

 

811)2 BIT

 

\bo

 

 

ROM MATRIX

A2

 

 

(1024 X 8)

A,

CS2 /CS2

 

 

 

Ao

Os

 

 

 

0,

07

 

 

 

02

06

 

 

 

03

05

 

 

 

Vss

04

 

 

 

Ao A,Ag

 

PIN NAMES

AO-Ag

ADDR ESS INPUTS

o,-Os

DATA OUTPUTS

CS,. CS2

CHIP SELECT INPUTS

5-55

Page 118 Page 120
Page 119
Image 119
Intel 8080 manual Silicon Gate MOS
Page 118 Page 120

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.