M80C287 データシートの表示（PDF） - Intel

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M80C287

80-BIT CHMOS III NUMERIC PROCESSOR EXTENSION

Intel 

M80C287

Timing Responses

Symbol

Parameter

t27

NPRD inactive to data float

t28

NPRD active to data valid

t29

ERROR active to BUSY inactive

t30

NPWR active to BUSY active

t31

NPRD NPWR or PEACK

active to PEREQ inactive

t32

Data hold from NPRD inactive

10 MHz

Min

Max

(ns)

(ns)

25

60

100

100

100

3

NOTES

1 The float condition occurs when the measured output current is less than IOL on D15 – D0

2 D15 – D0 loading CL e 100pf

3 BUSY loading CL e 100pf

4 On last data transfer of numeric instruction

Clock Timings

Symbol

Parameter

t1a

CLK period

CKMe1

t1b

CKMe0

t2a

CLK low time CKMe1

t2b

CKMe0

t3a

CLK high time CKMe1

t3b

CKMe0

t4

CLK fall time

t5

CLK rise time

10 MHz

Min

Max

(ns)

(ns)

100

250

50

125

35

11

35

18

10

10

NOTES

5 At 0 8V

6 At 2 0V

7 CKMe1 3 5V to 1 0V

8 CKMe1 1 0V to 3 5V

9 Proper operation can also be achieved by meeting the CPU specification

Comments

Note 1

Note 2

Note 3

Note 3

Note 4

Note 2

Comments

Note 5 9

Note 6 9

Note 7

Note 8

20

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