MM58174 datasheet(7/8 Pages) NSC

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Operating Conditions MM58174AN

TA eb40 Cto85 C VDD e 5V

TABLE IV Read Timing Data from Peripheral to Microprocessor

Symbol

Parameter

MM58174AN

Typ

Units

Comments

Min

Max

tACS0

Address Bus Valid to Chip Select ON (CS e 0)

tCSR

Chip Select ON to Read Strobe

tRD

Read Cycle Access Time from

900

450

CL e 100 pF

Read Strobe to Data Bus Valid

tRH

Data Hold Time from Trailing Edge of

330

Read Strobe

tRA

Address Bus Hold Time from

500

Trailing Edge of Read Strobe

tACS1

Address Change to Chip Select OFF

tAD

Address Bus Valid to Data Valid

1850

850

CL e 100 pF

tHZ

Time from Trailing Edge of Read

Strobe until Interface Device Bus

330

Drivers are in TRI-STATE Mode

tRW

Read Strobe Width

tAR

Address Bus Valid to Read Strobe

500

Note 1

In order not to degrade timekeeping accuracy the number of Read strobes in any one second should be less than 10000

Note 2

If address and read occur simultaneously then they must exist for tAR a tAD

TABLE V Write Timing Data from Microprocessor to Peripheral

Symbol

Parameter

MM58174AN

Typ

Units

Comments

Min

Max

tACS0

Address Bus Valid to Chip Select ON (CS e 0)

tCSW

Chip Select ON to Write Strobe

450

tAW

Address Bus Valid to Write Strobe

725

tWW

Write Strobe Width

670

tDW

Data Bus Valid before Write Strobe

tWA

Address Bus Hold Time following Write Strobe

165

tWD

Data Bus Hold Time following Write Strobe

185

tACS1

Address Change to Chip Select OFF (CS e 1)

Note 3

If address and write occur simultaneously then they must exist for tAW and tWW

MM58174 Datasheet(PDF) 7 Page - National Semiconductor (TI)

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