HEC40192BT 查看數據表（PDF） - Philips Electronics

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HEC40192BT

4-bit up/down decade counter

Philips Electronics 

Philips Semiconductors

4-bit up/down decade counter

FUNCTION TABLE

MR

PL

CPU

H

X

X

L

L

X

L

H

L

H

H

CPD

MODE

X

reset (asyn.)

X

parallel load

H

count-up

count-down

Product specification

HEF40192B

MSI

Notes

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

L = LOW state (the less positive voltage)

X = state is immaterial

= positive-going transition

Logic equations for terminal count:

TCD = O0 ⋅ O1 ⋅ O2 ⋅ O3 ⋅ CPD

TCU = O0 ⋅ O3 ⋅ CPU

Fig.5 State diagram.

AC CHARACTERISTICS

VSS = 0 V; Tamb = 25 °C; input transition times ≤ 20 ns

Dynamic power

dissipation per

package (P)

VDD

V

TYPICAL FORMULA FOR P (µW)

5

550 fi + ∑(foCL) × VDD2

10

2400 fi + ∑(foCL) × VDD2

15

6500 fi + ∑(foCL) × VDD2

where

fi = input freq. (MHz)

fo = output freq. (MHz)

CL = load capacitance (pF)

∑ (foCL) = sum of outputs

VDD = supply voltage (V)

January 1995

5

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