|
|
Número de pieza | 74ACT257M | |
Descripción | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | |
Fabricantes | STMicroelectronics | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de 74ACT257M (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
No Preview Available ! 74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD =5 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN), VIL = 0.8V (MAX)
s 50Ω TRANSMISSION LINE DRIVING
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 4.5V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The ACT257 is an advanced high-speed CMOS
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
These IC’s are composed of an independent 2
channel multiplexer with common SELECT and
PIN CONNECTION AND IEC LOGIC SYMBOLS
BM
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT257B
74ACT257M
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
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
data is closen.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
April 1997
1/10
1 page 74ACT257
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 5V ± 0.5V
Test Condition
V CC
(V)
5.0(*)
5.0(*)
5.0(*)
5.0(*)
Value
TA = 25 oC
-40 to 85 oC
Min. Typ. Max. Min. Max.
5.0 7.0
8.0
Unit
ns
6.0 9.0
10.0 ns
5.0 8.0
9.0 ns
6.0 9.0
10.0 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
CIN Input Capacitance
5.0
4 pF
COUT Input Capacitance
5.0
8 pF
CPD Power Dissipation
Capacitance (note 1)
5.0
31 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
5/10
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet 74ACT257M.PDF ] |
Número de pieza | Descripción | Fabricantes |
74ACT257 | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | STMicroelectronics |
74ACT257B | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | STMicroelectronics |
74ACT257M | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | STMicroelectronics |
74ACT257MTC | Quad 2-Input Multiplexer with 3-STATE Outputs | Fairchild Semiconductor |
Número de pieza | Descripción | Fabricantes |
SLA6805M | High Voltage 3 phase Motor Driver IC. |
Sanken |
SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |