Schottky Bipolar 8216/8226

4BIT PARALLEL BIDIRECTIONAL BUS DRIVER

•Data Bus Buffer Driver for 8080 CPU

•Low Input Load Current - .25 mA Maximum

•High Output Drive Capability for Driving System Data Bus

•3.65V Output High Voltage for Direct Interface to 8080 CPU

•Three State Outputs

•Reduces System Package Count

The 8216/8226 is a 4-bit bi-directional bus driver/receiver.

All inputs are low power TTL compatible. For driving MOS, the DO outputs provide a high 3.65V VOH, and for high capaci- tance terminated bus structures, the DB outputs provide a high 50mA IOl capability.

Anon-inverting (8216) and an inverting (8226) are available to meet a wide variety of applications for buffering in micro- computer systems.

PIN CONFIGURATION

LOGIC DIAGRAM

LOGIC DIAGRAM

 

8216

8226

cs

16Vee

0°0

2

 

15

OlEN

010

010

 

OBo

3

 

14

0°3

OBo

 

_ ---- oOBO

 

0°0

 

 

 

4

 

 

OB3

0°0

 

010

8216/

13

 

 

 

DO,

5

8226

12

013

01,

01,

,

DB,

6

 

11

0°2

DB,

 

_----0 DB,

 

 

 

 

 

 

 

 

 

DO,

DO,

 

01,

7

 

10

OB2

 

 

 

GND

8

 

9

O~

012

012

 

 

 

 

 

 

OB2

 

 

PIN NAMES

0°2

0°2

013

013

 

OB3

OB ·OB

DATA BUS

 

0°3

 

O 3 BI-OIRECTIONAL

 

 

 

0'o.0~

DATA INPUT

 

 

 

000.0°3

DATA OUTPUT

 

 

 

OlEN

DATA IN ENABLE

 

 

 

DIRECTION CONTROL

 

 

 

 

------+-......---- n cs

------+

cs

cs

CHIP SELECT

 

---- 0

 

 

 

OlEN o --- _ e _ ------ J

OlEN 0 ---.......------ 1

 

5-163

Page 232 Page 234
Page 233
Image 233
Intel 8080 manual +-......---- n cs, 8216 8226
Page 232 Page 234

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.
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