8085AH/8085AH-2/8085AH-1

A.C. CHARACTERISTICS (Continued)

 

 

 

 

 

 

8085AH[2]

8085AH-2[2]

8085AH-1

 

 

 

Symbol

 

Parameter

 

 

 

(Final)

(Final)

(Preliminary)

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Min.

Max.

Min.

Max.

Min.

Max.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tAll

 

AO-7 Valid Before Trailing Edge of ALE

 

 

 

90

 

50

 

 

25

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tARY

 

READY Valid from Address Valid

 

 

 

 

220

 

 

100

 

 

40

 

ns

 

tCA

 

Address (Aa-1S)Valid After Control

 

 

 

120

 

60

 

 

30

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tcc

 

Width of Control low (RD, WR, INTA)

 

 

 

400

 

230

 

 

150

 

 

ns

 

 

 

Edge of ALE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tCl

 

Trailing Edge of Control to leading Edge

 

 

 

50

 

25

 

 

0

 

 

ns

 

 

 

of ALE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tow

 

Data Valid to Trailing Edge of WRITE

 

 

420

 

230

 

 

140

 

 

ns

 

 

 

 

 

 

 

 

 

tHABE

 

HlDA to Bus Enable

 

 

 

210

 

 

150

 

150

 

ns

 

tHABF

 

Bus Float After HlDA

 

 

 

210

 

 

150

 

150

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tHACK

 

HlDA Valid to Trailing Edge of ClK

 

 

 

110

 

40

 

 

0

 

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tHOH

 

HOLD Hold Time

 

 

 

0

 

0

 

 

0

 

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tHOS

 

HOLD Setup Time to Trailing Edge of ClK

 

 

 

170

 

120

 

 

120

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlNH

 

INTR Hold Time

 

 

 

0

 

0

 

 

0

 

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tiNS

 

INTR, RST, and TRAP Setup Time to

 

 

 

160

 

150

 

 

150

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

Falling Edge of ClK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlA

 

Address Hold Time After ALE

 

 

 

100

 

50

 

 

20

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlC

 

Trailing Edge of ALE to leading Edge

 

 

 

130

 

60

 

 

25

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlCK

 

ALE low During ClK High

 

 

 

100

 

50

 

 

15

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tLOR

 

ALE to Valid Data During Read

 

 

 

 

460

 

 

270

 

 

175

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlOW

 

ALE to Valid Data During Write

 

 

 

 

200

 

 

120

 

 

110

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tll

 

ALE Width

 

 

 

140

 

80

 

 

50

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tlRY

 

ALE to READY Stable

 

 

 

 

110

 

 

30

 

 

10

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tRAE

 

Trailing Edge of READ to Re-Enabling

 

 

 

150

 

90

 

 

50

 

 

ns

 

 

 

of Address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tRO

 

READ (or INTA) to Valid Data

 

 

 

 

300

 

 

150

 

 

75

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tRV

 

Control Trailing Edge to leading Edge

 

 

 

400

 

220

 

 

160

 

 

ns

 

 

 

of Next Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tROH

 

Data Hold Time After READ lNTA

 

 

 

0

 

0

 

 

0

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tRYH

 

READY Hold Time

 

 

 

0

 

0

 

 

5

 

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tRYS

 

READY Setup Time to leading Edge

 

 

 

110

 

100

 

 

100

 

 

ns

 

 

 

ofClK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

two

 

Data Valid After Trailing Edge of WRITE

 

 

 

100

 

60

 

 

30

 

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tWOL

 

lEADING Edge of WRITE to Data Valid

 

 

 

 

40

 

 

20

 

 

30

 

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6-20

 

 

 

 

 

 

 

 

AFN·01,835C

Page 129
Image 129
Intel MCS-80/85 manual 8085AH/8085AH-2/8085AH-1 Characteristics

MCS-80/85 specifications

The Intel MCS-80/85 family, introduced in the late 1970s, is a seminal collection of microprocessors that played a pivotal role in the early days of computing. The MCS-80 series, initially targeting embedded systems and control applications, gained remarkable attention due to its innovative architecture and flexible programming capabilities.

The MCS-80 family is anchored by the 8080 microprocessor, which was one of the first fully integrated 8-bit microprocessors. Released in 1974, the 8080 operated at clock speeds ranging from 2 MHz to 3 MHz and featured a 16-bit address bus capable of addressing up to 64KB of memory. The processor’s instruction set included around 78 instructions, providing extensive capabilities for data manipulation, logic operations, and branching.

Complementing the 8080 was a suite of support chips, forming the MCS-80 platform. The most notable among them was the 8155, which integrated a static RAM, I/O ports, and a timer, tailored for ease of designing systems around the 8080. Other support chips included the 8085, which provided improvements with an integrated clock generator, making it compatible with more modern designs and applications.

The MCS-85 series, on the other hand, revolves around the 8085 microprocessor, which provided a more advanced architecture. The 8085 operated at clock speeds of up to 6 MHz and came with a 16-bit address bus, similar to its predecessor. However, it introduced more sophisticated features, including an enhanced instruction set and support for interrupt-driven programming. These enhancements made the 8085 especially appealing to developers working in real-time processing environments.

The MCS-80/85 family utilized NMOS technology, known for its lower power consumption and higher performance compared to previous technologies like TTL. The family’s architecture allowed for easy interfacing with a variety of peripherals, making it a favorite for educational institutions and hobbyists embarking on computer engineering projects.

With its robustness, versatility, and affordability, the Intel MCS-80/85 microprocessors laid the groundwork for many subsequent microcomputer systems and applications. The legacy of this powerful family continues to influence modern microprocessor design, emphasizing the importance of reliable architecture in a rapidly evolving technology landscape.