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74LVT244B Datasheet, PDF (6/10 Pages) NXP Semiconductors – 3.3V Octal buffer/line driver 3-State
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Philips Semiconductors
3.3V Octal buffer/line driver (3-State)
Product specification
74LVT244B
NOTE:
1. All typical values are at VCC = 3.3V and Tamb = 25°C.
AC WAVEFORMS
VM = 1.5V, VIN = GND to 2.7V
nAx INPUT
VM
tPLH
nYx
VM
OUTPUT
3.0V or VCC
whichever
is less
VM
tPHL
VM
0V
VOH
VOL
OE INPUT
1.5V
tPZL
Yn OUTPUT
1.5V
tPZH
Yn OUTPUT
1.5V
1.5V
tPLZ
tPHZ
2.7V
0V
3.0V
VOL + 0.3V
VOL
VOH
VOH – 0.3V
SA00016
Waveform 1. Input (nAx) to Output (nYx) Propagation Delays
0V
SV00103
Waveform 2. 3-State Output Enable and Disable Times
TEST CIRCUIT AND WAVEFORMS
VCC
PULSE
GENERATOR
VIN
RT
D.U.T.
VOUT
CL
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST SWITCH
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
6V
GND
6.0V
Open
90%
RL
GND
NEGATIVE
PULSE
RL
POSITIVE
PULSE
10%
VM
10%
tW
VM
10%
tTHL (tF)
tTLH (tR)
90%
VM
90%
VM
tW
VM = 1.5V
Input Pulse Definition
90%
AMP (V)
0V
tTLH (tR)
tTHL (tF)
AMP (V)
10%
0V
DEFINITIONS
RL = Load resistor; see AC CHARACTERISTICS for value.
CL = Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
FAMILY
74LVT
INPUT PULSE REQUIREMENTS
Amplitude Rep. Rate tW
tR
tF
2.7V
v10MHz 500ns v2.5ns v2.5ns
SV00092
1998 Nov 12
6
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