Philips Semiconductors
Octal transceiver with dual enable (3-State)
Product specification
74LVC623A
AC WAVEFORMS
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 at 0.3V 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
An, Bn
INPUT
GND
VOH
An, Bn
OUTPUT
VM
tPHL
VM
tPLH
VOL
SV00747
Figure 1. Input (An, Bn) to output (Bn, An) propagation delays.
VI
OEBA
INPUT
VM
GND
VCC
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
tPLZ
VX
tPZL
VM
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
tPHZ
outputs
enabled
tPZH
VY
outputs
disabled
VM
outputs
enabled
SV00748
Figure 2. 3-State enable and disable times for OEBA input
VI
OEAB
INPUT
VM
GND
VCC
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
tPLZ
VX
tPZL
VM
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
tPHZ
outputs
enabled
tPZH
VY
outputs
disabled
VM
outputs
enabled
SV00749
Figure 3. 3-State enable and disable times for OEAB input
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 4. Load circuitry for switching times
1998 Jul 29
6