SN74HCT257 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs | TI.com

SN74HCT257 (ACTIVE) Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs

Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs - SN74HCT257
Datasheet
 

Description

The ’HCT257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE)\ input is at the high logic level.

To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Features

  • Operating Voltage Range of 4.5 V to 5.5 V
  • High-Current 3-State Outputs Interface Directly With System Bus
  • Typical tpd = 17 ns
  • Low Power Consumption, 80-µA Max ICC
  • ±6-mA Output Drive at 5 V
  • Low Input Current of 1 µA Max
  • Inputs Are TTL-Voltage Compatible
  • Provide Bus Interface From Multiple Sources in High-Performance Systems
  • Buffered Inputs and Outputs

Parametrics

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Part number Order Function Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) Configuration Type IOL (Max) (mA) IOH (Max) (mA) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Bits (#) Digital input leakage (Max) (uA) ESD CDM (kV) ESD HBM (kV)
SN74HCT257 Order now Encoder
Multiplexer    
HCT     4.5     5.5     4     5     25     0.08     38     2:1     3-State Output     6     -6     Catalog     -40 to 85     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)    
2     5     0.75     2