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SN54HC257, SN54HC257AJ, SN54HC257BCAJC

Table of contents:
Info of SN54HC257
Info of SN54HC257AJ
Info of SN54HC257BCAJC

SN54HC257, SN54HC257AJ, SN54HC257BCAJC Selling Leads, Datasheet

MFG:TI Package Cooled:CDIP D/C:93+

SN54HC257, SN54HC257AJ, SN54HC257BCAJC Picture

SN54HC257, SN54HC257AJ, SN54HC257BCAJC Datasheet download

Five Points

Part Number: SN54HC257

MFG: TI

Package Cooled: CDIP

D/C: 93+

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SN54HC257 General Description

These 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 (G) input is at a high logic level.
To ensure the high-impedance state during power up or power down, G 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.

SN54HC257 Maximum Ratings

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
Package thermal impedance, JA (see Note 1): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W
                                                                           N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
                                                                         NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W
                                                                        PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.

SN54HC257 Features

` Wide Operating Voltage Range of 2 V to 6 V
` High-Current Inverting Outputs Drive Up To 15 LSTTL Loads
` Low Power Consumption, 80-A Max ICC
` 'HC257 . . . Typical tpd = 9 ns
` 'HC258 . . . Typical tpd = 12 ns
` ±6-mA Output Drive at 5 V
` Low Input Current of 1 A Max
` Provides Bus Interface from Multiple Sources in High-Performance Systems

SN54HC257 Connection Diagram

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