|
|
PDF 74LS257 Data sheet ( Hoja de datos )
| Número de pieza | 74LS257 | |
| Descripción | LOW POWER SCHOTTKY | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 74LS257 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
SN74LS257B SN74LS258B
Quad 2-Input Multiplexer
with 3-State Outputs
The LSTTL / MSI SN74LS257B and the SN74LS258B are Quad
2-Input Multiplexers with 3-state outputs. Four bits of data from two
sources can be selected using a Common Data Select input. The four
outputs present the selected data in true (non-inverted) form. The
outputs may be switched to a high impedance state with a HIGH on the
common Output Enable (EO) Input, allowing the outputs to interface
directly with bus oriented systems. It is fabricated with the Schottky
barrier diode process for high speed and is completely compatible with
all ON Semiconductor TTL families.
• Schottky Process For High Speed
• Multiplexer Expansion By Tying Outputs Together
• Non-Inverting 3-State Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
• Special Circuitry Ensures Glitch Free Multiplexing
• ESD > 3500 Volts
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current – High
IOL Output Current – Low
– 2.6
24
mA
mA
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS257BN 16 Pin DIP 2000 Units/Box
SN74LS257BD
16 Pin
2500/Tape & Reel
SN74LS258BN 16 Pin DIP 2000 Units/Box
SN74LS258BD
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS257B/D
1 page  
SN74LS257B SN74LS258B
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
VOH
VOL
IOZH
IOZL
IIH
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Output Off Current — HIGH
Output Off Current — LOW
Input HIGH Current
Other Inputs
S Inputs
Other Inputs
S Inputs
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
2.4 3.1
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
0.25 0.4
0.35 0.5
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
20 µA VCC = MAX, VOUT = 2.7 V
– 20 µA VCC = MAX, VOUT = 0.4 V
20 µA VCC = MAX, VIN = 2.7 V
40
0.1
0.2
mA VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
All Inputs
– 0.4 mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 30
Power Supply Current
Total, Output HIGH
LS257B
LS258B
– 130 mA VCC = MAX
10 mA
9.0
ICC
Total, Output LOW
LS257B
LS258B
16
14
mA VCC = MAX
Total, Output 3-State
LS257B
LS258B
19
16
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) See SN74LS251 for Waveforms
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
tPHL
Propagation Delay, Data to Output
10 13
12 15 ns
tPLH
tPHL
Propagation Delay, Select to Output
14
14
21
21
ns
tPZH Output Enable Time to HIGH Level
20 25 ns
tPZL Output Enable Time to LOW Level
20 25 ns
tPLZ Output Disable Time to LOW Level
16 25 ns
tPHZ Output Disable Time from HIGH Level
18 25 ns
Test Conditions
Figures 1 & 2
Figures 1 & 2
CL = 45 pF
Figures 4 & 5
Figures 3 & 5
Figures 3 & 5
Figures 4 & 5
CL = 45 pF
RL = 667 Ω
CL = 5.0 pF
RL = 667 Ω
http://onsemi.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74LS257.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 74LS251 | LOW POWER SCHOTTKY | ON Semiconductor |
| 74LS251 | 3-STATE 1-of-8 Line Data Selector/Multiplexer |  Fairchild Semiconductor |
| 74LS251 | 1 of 8 Data Selectors/Multiplexers(with strobe and three-state outputs) |  Hitachi Semiconductor |
| 74LS253 | 3-STATE Data Selector/Multiplexer | 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 |