Symbol Parameter Min, Unit Test Condition

SILICON GATE MOS 8080A-2

A.C. CHARACTERISTICS

TA = O°C to 70°C, Vee = +12V ± 5%, VCC = +5V ± 5%, Vss = -5V ± 5%, Vss = OV, Unless Otherwise Noted

Symbol			Parameter	Min.	Max.	Unit	Test Condition
tCy[31	Clock Period			.38	2.0	/lsec
t r , tf	Clock Rise and Fall Time			0	50	nsec
t¢1	(j>1	Pulse Width		60		nsec
!¢2	l/>2	Pulse Width		175		nsec
t01	Delay (j>1		to (j>2	0		nsec
t02	Delay <P2		to <P1	70		nsec
t03	Delay ~ to (j>2 Leading Edges			70		nsec
tOA [2]	Address Output Delay From (j>2				175	nsec	} CL = 100pf
too [2]	Data Output Delay From (j>2				200	nsec
toc [2]	Signal Output Delay From ¢1, or (/>2 (SYNC, WR,WAIT, HLOA)				120	nsec	}C =50pf
tOF [2]	DSIN Delay From lP2			25	140	nsec	L
tOF [2]	DSIN Delay From lP2			25	140	nsec
tOI[1]	Delay for Input Bus to Enter Input Mode				tOF	nsec
tOS1	Data Setup Time During lP1 and DBIN			20		nsec

TIMING WAVEFORMS [14]	(Note: Timing measurements are made at the following reference voltages: CLOCK "1" = 8.0V

	"0" = 1.0V; INPUTS "1" = 3.3V, "0" = 0.8V; OUTPUTS "1" = 2.0V, "0" = 0.8V.)

--.ift'II ., t CY

~1J

- 4 - t<t>2----'1

-I

- . to, ~

r~ }\ 71\

~....

-ll

~J-

~I-

<1>2

~r-

""~H

--.1 t 02 . -

... to3~1

-=t --- --

----

--"i

tAW--++---~·1

A 1S -Ao ---------........-- lr------

---- ------

~tOA~

.. - too - 'I

~ to! \ . -

--- l

toHI"'-

f4--t OO - '

~A!.A_O~T _ ,

.x=

~,...OATA IN

)

-~ IJ.....-......---H--.~...-

0 7 .00 ---------oo+---....."rl....---------,.......... .J~-t--

~ t os1 1.-

iIIf-- t ow ,---.

SYNC

~tOS2-'

- . t oc 1.-

~ t oc I-+--

---------......."""1

-t-1P--------+~\1

......

OBIN

------------------+----11

/I - \ -

--- +o ----- ++ --- + -- + -- ++ ---- t+" -- t

~tDF-.1

READY

-X@

-;:r...

~_;__...lIl

WAIT

tH --.

HOLD

HLOA

INT

t oc -- . 1..-	t H -.1 1.-
	.-X@ IX

-----------------------------------------......tr~;....I~..,..I~-..........

-------------------------------------------	,t"-f
	_~LI~-"""""Ij,..
~-----------------	_-:-'Xr~ ~t
	t,s!=-=
	tH~ ...

INTE

5-26

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.

Intel 8080 manual Symbol Parameter Min, Unit Test Condition

Models: 8080

SILICON GATE MOS 8080A-2

A.C. CHARACTERISTICS

Symbol

Parameter

Min.

Unit

Test Condition

}C =50pf

TIMING WAVEFORMS [14]