HEF4508 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Lista de partido
HEF4508 Datasheet PDF : 9 Pages
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Philips Semiconductors
Dual 4-bit latch
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP. MAX.
Minimum ST
5
50 25
ns
pulse width; HIGH
10
tWSTH
30 15
ns
15
20 10
ns
Minimum MR pulse
5
40 20
ns
width; HIGH
10
tWMRH
24 12
ns
15
20 10
ns
Recovery time
5
20 0
ns
for MR
10
tRMR
20 0
ns
15
15 0
ns
Set-up times
5
35 10
ns
Dn → ST
10
tsu
15
25 5
ns
20 0
ns
Hold times
5
20 0
ns
Dn → ST
10
thold
15
20 0
ns
15 0
ns
Product specification
HEF4508B
MSI
see also waveforms Fig.4
Dynamic power
dissipation per
package (P)
VDD
V
TYPICAL FORMULA FOR P (µW)
5
2 000 fi + ∑ (foCL) × VDD2
where
10
9 000 fi + ∑ (foCL) × VDD2
fi = input freq. (MHz)
15
25 000 fi + ∑ (foCL) × VDD2
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (foCL) = sum of outputs
VDD = supply voltage (V)
January 1995
6
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