74LVC139 查看數據表（PDF） - Philips Electronics
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74LVC139 Datasheet PDF : 10 Pages
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Philips Semiconductors
Dual 2-to-4 line decoder/demultiplexer
Product specification
74LVC139
AC WAVEFORMS
VM = 1.5 V at VCC w 2.7 V
VM = 0.5 × VCC at VCC < 2.7 V
VOL and VOH are the typical output voltage drop that occur with the
output load.
VI
E INPUT
VM
GND
V OH
tPHL
tPLH
nY OUTPUTS
VM
V OL
SV00561
Figure 1. Input (nA) to output (nY) propagation delays.
VI
nI0, nI1, S
INPUTS
VM
GND
V OH
tPHL
tPLH
nY OUTPUT
VM
V OL
SV00562
Figure 2. Enable input (nE) to output (nYn) propagation delays.
TEST CIRCUIT
PULSE
GENERATOR
VI
RT
VCC
D.U.T.
S1
2 * VCC
Open
GND
500Ω
VO
50pF
CL
500Ω
SWITCH POSITION
TEST
S1
tPLH/tPHL
Open
VCC
< 2.7V
2.7–3.6V
VI
VCC
2.7V
SV00903
Figure 3. Load circuitry for switching times.
1998 Apr 28
6
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