74HC4538PW,112 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
74HC4538PW,112 Datasheet PDF : 24 Pages
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NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter Conditions
25 °C
Min Typ[1] Max
CPD
power
per multivibrator;
[3]
-
138
-
dissipation
VI = GND to (VCC − 1.5 V)
capacitance
−40 °C to
+85 °C
Min Max
-
-
−40 °C to Unit
+125 °C
Min Max
-
- pF
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi × Σ(CL × VCC2 × fo) + 0.48 × CEXT × VCC2 × fo + D × 0.8 × VCC where:
fi = input frequency in MHz;
fo = output frequency in MHz;
Σ(CL × VCC2 × fo) = sum of the outputs;
CL = output load capacitance in pF;
VCC = supply voltage in V;
D = duty cycle factor in %;
CEXT = external timing capacitance in pF.
11. Waveforms
VI
nB input
GND
VI
nA input
GND
VI
nCD input
GND
VOH
nQ output
VOL
VOH
nQ output
VOL
VM
tW
tPLH
VM
tPHL
VM
VM
tW
VY
VX
tTHL
tPLH
VM
tPHL
tTLH
VY
VX
Fig 7.
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Waveforms showing propagation delays and transition times
VM
tPHL
tPLH
001aak194
74HC_HCT4538_3
Product data sheet
Rev. 03 — 8 June 2009
© NXP B.V. 2009. All rights reserved.
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