74ABT16646 Просмотр технического описания (PDF) - Philips Electronics
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74ABT16646 Datasheet PDF : 12 Pages
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Philips Semiconductors
16-bit bus transceiver/register (3-State)
Product specification
74ABT16646
74ABTH16646
AC WAVEFORMS (Continued)
VM = 1.5V, VIN = GND to 3.0V
nSBA or
nSAB
nAx or nBx
VM
tPHL
VM
VM
tPLH
VM
3.0V or VCC
0V
VOH
VOL
SH00032
Waveform 3. Propagation Delay, nSBA to nAx or nSAB to nBx
ÉÉÉÉ ÉÉÉÉÉÉÉÉÉ nAxor
ÉÉÉÉÉÉÉÉ ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ nBx
VM
VM
VM
VM
3.0V
or
VCC
0V
ts(H)
th(H)
ts(L)
th(L)
3.0V
nCPBA or
nCPAB
VM
or
VCC
VM
0V
NOTE: The shaded areas indicate when the input is permitted
to change for predictable output performance.
SH00033
Waveform 4. Data Setup and Hold Times
TEST CIRCUIT AND WAVEFORMS
nOE, nDIR
nDIR
nAx or nBx
VM
tPZH
VM
tPHZ
VM
3.0V or VCC
whichever
is less
0V
VOH
VY
0V
SH00034
Waveform 5. 3–State Output Enable Time to High Level and
Output Disable Time from High Level
nOE, nDIR
nDIR
nAx or nBx
VM
tPZL
VM
tPLZ
VM
3.0V or VCC
0V
3.0V or VCC
VX
VOL 0V
SH00035
Waveform 6. 3–State Output Enable Time to Low Level and
Output Disable Time from Low Level
VCC
VIN
VOUT
RL
PULSE
D.U.T.
GENERATOR
RT
CL
RL
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST SWITCH
tPLZ
closed
tPZL
closed
All other open
7.0V
90%
NEGATIVE
PULSE
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
INPUT PULSE REQUIREMENTS
Amplitude Rep. Rate tW
tR
tF
74ABT/H16
3.0V
1MHz 500ns 2.5ns 2.5ns
SA00018
1998 Feb 27
9
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