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Switching Characteristics

Operating Characteristics

SN74LVC4245A

OCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTER

WITH 3-STATE OUTPUTS

SCAS375H – MARCH 1994 – REVISED MARCH 2005

over recommended operating free-air temperature range, C

FROM

TO

PARAMETER

UNIT

(INPUT)

(OUTPUT)

MIN

MAX

1

6.3

A

B

ns

1

6.7

1

6.1

B

A

ns

1

5

1

9

OE

A

ns

1

8.1

1

8.8

OE

B

ns

1

9.8

1

7

OE

A

ns

1

5.8

1

7.7

OE

B

ns

1

7.8

V

PARAMETER

TEST CONDITIONS

TYP

UNIT

Outputs enabled

39.5

Power dissipation capacitance per transceiver

f = 10 MHz

pF

Outputs disabled

5

TI level-translation devices offer an opportunity for successful mixed-voltage signal design. A proper power-up

sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other

anomalies caused by improperly biased device pins. Take these precautions to guard against such power-up

problems:

1. Connect ground before any supply voltage is applied.

4. Depending on the direction of the data path, DIR can be high or low. If DIR high is needed (A data to B bus),

(1)

Refer to the TI application report, Texas Instruments Voltage-Level-Translation Devices, literature number SCEA021.

5