74LVC646A Просмотр технического описания (PDF) - Philips Electronics
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74LVC646A Datasheet PDF : 16 Pages
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Philips Semiconductors
Octal bus transceiver/register (3-State)
Product specification
74LVC646A
AC WAVEFORMS (Continued)
VM = 1.5V at VCC w 2.7V
VM = 0.5V * VCC at VCC t 2.7V
VOL and VOH are the typical output voltage drop that occur with the
output load.
VX = VOL + 0.3V at VCC w 2.7V
VX = VOL + 0.1VCC at VCC < 2.7V
VY = VOH – 0.3V at VCC w 2.7V
VY = VOH – 0.1VCC at VCC < 2.7V
VI
DIR INPUT
GND
VOH
An OUTPUT
GND
VCC
An OUTPUT
VOL
VOH
Bn OUTPUT
VOL
VOH
Bn OUTPUT
VOL
VM
tPHZ
VY
tPLZ
VX
tPZH
VM
tPZL
VM
tPZH
VM
tPZL
VM
tPHZ
VY
tPHZ
VX
SV00757
Figure 5. Input DIR to output An, Bn 3-State enable and disable
times.
TEST CIRCUIT
VI
PULSE
GENERATOR
VCC
D.U.T.
RT
VO
CL 50pF
S1
500Ω
2 x VCC
Open
GND
500Ω
VCC
t 2.7V
2.7V – 3.6V
VI
VCC
2.7V
Test
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
2 x VCC
GND
SY00003
Figure 6. Load circuitry for switching times.
1998 Jul 29
10
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