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SN54HCT257

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 In...

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SN54HCT257: 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 ...

SN54HCT257 Data Sheet

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Part Number:
SN54HCT257
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Pinout

Connection Diagram


Specifications

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . .−0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . ±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 2): D package . . . . . 73°C/W
                                                                           N package . . . .  .67°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . .−65°C to 150°C


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 HCT257 is determined by the current-sinking capability of the driver.




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