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PDF 74AC257B Data sheet ( Hoja de datos )
| Número de pieza | 74AC257B | |
| Descripción | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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74AC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD =4.5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s 50Ω TRANSMISSION LINE DRIVING
BM
CAPABILITY
(Plastic Package)
(Micro Package)
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
s BALANCED PROPAGATION DELAYS:
ORDER CODES :
74AC257B
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s IMPROVED LATCH-UP IMMUNITY
These IC’s are composed of an independent 2
channel multiplexer with common SELECT and
ENABLE INPUT.
The AC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High”, outputs
of both IC’s become high impedance state. If
DESCRIPTION
SELECT INPUT is held ”Low”, ”A” data is
The AC257 is an advanced high-speed CMOS selected, when SELECT INPUT is ”High”, ”B”
QUAD 2 CHANNEL MULTIPLEXER (3-STAwTwEw.D)ataSheet4dU.acotma is chosen.
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
them 2KV ESD immunity and transient excess
voltage.
Schottky TTL.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 1997
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1 page  
74AC257
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)
Symbol
P ar ame te r
tPLH Propagation Delay Time
tPHL A,B to Y
tPLH Propagation Delay Time
tPHL SEL to Y
tPZL Output Enable Time
tPZH
tPLZ Output Disable Time
tPHZ
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5V ± 0.5V
Test Condition
V CC
(V)
3.3(*)
5.0(**)
3.3(*)
5.0(**)
3.3(*)
5.0(**)
3.3(*)
5.0(**)
Value
TA = 25 oC
-40 to 85 oC
Min. Typ. Max. Min. Max.
1.5 5.5 8.5 1.5 9
1.5 4.5 6 1.5 7
1.5 7 10.5 1.5 11.5
1.5 5.5 7.5 1.5 8.5
1.5 5.5 9 1.5 10
1.5 4.5 7.5 1.5 8.5
1.5 7 10 1.5 11
1.5 5.5 9 1.5 10
Unit
ns
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Symbol
P ar ame te r
Test Conditions
V CC
(V)
Value
TA = 25 oC
-40 to 85 oC
Min. Typ. Max. Min. Max.
Unit
COUT Output Capacitance
5.0
8 pF
CIN Input Capacitance
5.0
4 pF
CPD Power Dissipation
Capacitance (note 1)
5.0
20 pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to
Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/n (per circuit)
TEST CIRCUIT
T E ST
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
CL = 50 pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
SWITCH
Open
2VCC
Open
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74AC257B.PDF ] | |
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