SN74LVC257APWLE datasheet(12/30 Pages) TI1

12 / 30 page

–100

–80

–60

–40

–20

–1

–0.5 0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

TA = 25°C, VCC = 3 V,

VIH = 3 V, VIL = 0 V,

All Outputs Switching

VOH – V

VOL – V

–20

100

–0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

TA = 25°C, VCC = 3 V,

VIH = 3 V, VIL = 0 V,

All Outputs Switching

SN54LVC257A, SN74LVC257A

SCAS294O – JANUARY 1993 – REVISED JUNE 2015

www.ti.com

Typical Application (continued)

10.2.2 Detailed Design Procedure

1. Recommended Input Conditions

–

For rise time and fall time specification, see (

Δt/ΔV) in the Recommended Operating Conditions table.

–

For specified high and low levels, see (VIH and VIL) in the Recommended Operating Conditions table.

–

Inputs are over voltage tolerant allowing them to go as high as (VI max) in the Recommended Operating

Conditions table at any valid VCC.

2. Recommend Output Conditions

–

Load currents must not exceed (IO max) per output and must not exceed (continuous current through VCC

or GND) total current for the part. These limits are in the Recommended Operating Conditions table.

–

Outputs must not be pulled above VCC.

10.2.3 Application Curves

Figure 5. Output Drive Current (IOL)

Figure 6. Output Drive Current (IOH)

vs LOW-level Output Voltage (VOL)

vs HIGH-level Output Voltage (VOH)

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