Read Cycle, 4000, Ref =, Write Cycle | Intel 8080 specification

SILICON GATE MOS 81078·4

			0	= 12V ± 5%, VCC = 5V ± 10%, Va a = -5V ± 5%,
A. C. Characteristics TA = oOc to 70 C, Voo				= 12V ± 5%, VCC = 5V ± 10%, Va a = -5V ± 5%,
READ, WRITE, AND READ MODIFY/WRITE CYCLE vss = OV, unless otherwise noted.
Symbol	Parameter	Min.	Max.	Unit		Conditions
tREF	Time Between Refresh		2	ms
tAC	Address to CE Set Up Time	0		ns	tAC is measured from end of address transition
tAH	Address Hold Time	100		ns
tcc	CE Off Time	130		ns
tT	CE Transition Time	10	40	ns
tCF	CE Off to Output	0		ns
	High Impedance-State
READ CYCLE
Symbol	Parameter	Min.	Max.	Unit		Conditions
tCY	Cycle Time	470		ns	tT = 20ns
tCE	CE On Time	300	4000	ns
tco	CE Output Delay		250	ns	C10ad = 50pF, Load = One TTL Gate,
tACC	Address to Output Access		270	ns	Ref = 2.0V.
tWL	CE to WE	0		ns	tACC = tAC + tco + 1tT
twc	WE to CE on	0		ns
WRITE CYCLE
Symbol	Parameter	Min.	Max.	Unit		Conditions
tCY	Cycle Time	470		ns	tT = 20ns
tCE	CE On Time	300	4000	ns
tw	WE to CE Off	150		ns
tcw	CE to WE	150		ns
tow [2]	DIN to WE Set Up	0		ns
tOH	DIN Hold Time	0		ns,
twP	WE Pulse Width	50		ns
Read Modify Write Cycle
Symbol	Parameter	Min.	Max.	Unit		Conditions
t RwC	Read Modify Write( RMW)	590		ns	tT = 20ns
	Cycle Time
t CRW	CE Width During RMW	420	4000	ns
!wc	WE to CE on	0		ns
!wc
tw	WE to CE off	150		ns	C	= 50pF, Load = One TTL Gate,
twp	WE Pulse Width	50		ns		10ad
twp	WE Pulse Width	50		ns	Ref = 2.0V
tow	DIN to WE Set Up	0		ns
t OH	DIN Hold Time	0		ns
tco	CE to Output Delay		250	ns
tco
tACC	Access Time		270	ns	tACC = tAC + tco + ltT
tACC

5-86

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 Read Cycle, 4000, Ref =, Write Cycle

Models: 8080

SILICON GATE MOS 81078·4

A. C. Characteristics TA = oOc to 70 C, Voo

READ CYCLE

4000

Ref = 2.0V.

WRITE CYCLE

Read Modify Write Cycle

twp

tACC

8080 specifications