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74AHCT257D Datenblatt(PDF) 11 Page - NXP Semiconductors

Teilenummer 74AHCT257D
Bauteilbeschribung  Quad 2-input multiplexer; 3-state
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74AHCT257D Datenblatt(HTML) 11 Page - NXP Semiconductors

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2000 Apr 03
11
Philips Semiconductors
Product specification
Quad 2-input multiplexer; 3-state
74AHC257;
74AHCT257
handbook, full pagewidth
MNA450
tPLZ
tPHZ
outputs
disabled
outputs
enabled
VOH − 0.3 V
VOL + 0.3 V
outputs
enabled
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
OE input
VI
VCC
VM
(1)
VOL
VOH
GND
GND
tPZL
tPZH
VM
(2)
VM
(2)
Fig.7 3-state enable and disable times.
FAMILY
VI INPUT
REQUIREMENTS
VM(1)
INPUT
VM(2)
OUTPUT
AHC
GND to VCC
50% VCC 50% VCC
AHCT
GND to 3.0 V
1.5 V
50% VCC
Fig.7 3-state enable and disable times.
Fig.8 Load circuitry for switching times.
handbook, full pagewidth
open
GND
VCC
VCC
VI
VO
MNA219
D.U.T.
CL
RT
1000
PULSE
GENERATOR
S1
TEST
S1
tPLH/tPHL
open
tPLZ/tPZL
VCC
tPHZ/tPZH
GND
Definitions for test circuit.
CL = load capacitance including jig and probe capacitance (See Chapter “AC characteristics”).
RT = termination resistance should be equal to the output impedance Zo of the pulse generator.


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