HEF4527BT Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

fabricante

HEF4527BT

BCD rate multiplier

Philips Electronics 

Philips Semiconductors

BCD rate multiplier

Product specification

HEF4527B

MSI

FUNCTION TABLE

INPUTS

OUTPUTS

NUMBER OF PULSES OR LOGIC LEVEL

NUMBER OF PULSES

OR LOGIC LEVEL MODE OF OPERATION

SD SC SB SA CP CE STR CAS CL PL O1 O1 TC TC

L L L L 10 L L L L L L H 1 1

L L L H 10 L L L L L 1

1

11

L L H L 10 L L L L L 2

2

11

L L H H 10 L L L L L 3

3

11

L H L L 10 L L L L L 4

4

11

L H L H 10 L L L L L 5

5

11

L H H L 10 L L L L L 6

6

11

L H H H 10 L L L L L 7

7

1 1 rate pulses at the outputs

depend on the BCD input

H L L L 10 L L L L L 8

8

1

1 number at SA to SD

H L L H 10 L L L L L 9

9

11

H L H L 10 L L L L L 8

8

11

H L H H 10 L L L L L 9

9

11

H H L L 10 L L L L L 8

8

11

H H L H 10 L L L L L 9

9

11

H H H L 10 L L L L L 8

8

11

H H H H 10 L L L L L 9

9

11

X X XX X H L

L

L

L

(5)

(5)

H (5) CE = H; counter disabled

X X X X 10 L H L L L L

H

1 1 outputs O1 and O2 disabled

X X X X 10 L L H L L H

(4)

1

1 output O1 disabled

H X X X 10 L L L H X 10 10 H L CL = H

L X X X X L L L H X L H H L counter reset

X X X X X L L L L H L H L H PL = H; preset to ‘9’

Notes

1. H = HIGH state (the more positive voltage)

2. L = LOW state (the less positive voltage)

3. X = state is immaterial

4. Same output as the first 16 lines of this function table (depends on the values of SA to SD).

5. Depends on internal state of the counter.

January 1995

5

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