M87C51FC

ALEPROG and PSEN e 100 pF Load Capacitance for All Other Outputs e 80 pF)

ADVANCED INFORMATIONCONTACT INTEL FOR DESIGN-IN INFORMATION

EXTERNAL PROGRAM MEMORY CHARACTERISTICS

Symbol

Parameter

12 MHz

16 MHz

Variable

Units

Oscillator

Oscillator

Oscillator

Min

Max

Min

Max

Min

Max

1TCLCL

Oscillator Frequency

35

16

MHz

TLHLL

ALE Pulse Width

127

85

2TCLCLb40

ns

TAVLL

Address Valid to ALE Low

43

23

TCLCLb40

ns

TLLAX

Address Hold

53

33

TCLCLb30

ns

After ALE Low

TLLIV

ALE Low to

234

150

4TCLCLb100

ns

Valid Instruction In

TLLPL

ALE Low to PSEN Low

53

33

TCLCLb30

ns

TPLPH

PSEN Pulse Width

205

143

3TCLCLb45

ns

TPLIV

PSEN Low to

145

83

3TCLCLb105

ns

Valid Instruction In

TPXIX

Input Instruction Hold

0

0

0

ns

After PSEN

TPXIZ

Input Instruction Float

59

38

TCLCLb25

ns

Float After PSEN

TAVIV

Address to

312

208

5TCLCLb105

ns

Valid Instruction In

TPLAZ

PSEN Low to

10

10

10

ns

Address Float

TRLRH

RD Pulse Width

400

275

6TCLCLb100

ns

TWLWH

WR Pulse Width

400

275

6TCLCLb100

ns

TRLDV

RD Low to Valid Data In

252

1475

5TCLCLb165

ns

TRHDX

Data Hold After RD

00

0

ns

TRHDZ

Data Float After RD

107

65

2TCLCLb60

ns

TLLDV

ALE Low to Valid Data In

517

350

8TCLCLb150

ns

TAVDV

Address to Valid Data In

585

398

9TCLCLb165

ns

TLLWL

ALE Low to

200

300

138

238

3TCLCLb50

3TCLCLa50

ns

RD or WR Low

TAVWL

Address Valid to WR Low

203

120

4TCLCLb130

ns

TQVWX

Data Valid before WR

33

13

TCLCLb50

ns

TWHQX

Data Hold after WR

33

13

TCLCLb50

ns

TQVWH

Data Valid to WR High

433

288

7TCLCLb150

ns

TRLAZ

RD Low to

0

0

0

ns

Address Float

TWHLH

RD or WR High

43

123

23

103

TCLCLb40

TCLCLa40

ns

to ALE High

9