74LVXC4245MTC datasheet(5/8 Pages) FAIRCHILD

Part #	74LVXC4245MTC

Description	8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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AC Electrical Characteristics

Note 6: Typical values at VCCA = 5V, VCCB = 5V @25°C.

Note 7: Typical values at VCCA = 5V, VCCB = 3.3V @25°C.

Note 8: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The

specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Parameter guaranteed by design.

Capacitance

Note 9: CPD is measured at 10 MHz.

Power Up Considerations

To insure the system does not experience unnecessary ICC

current draw, bus contention, or oscillations during power

up, the following guidelines should be adhered to (refer to

Table 1):

• Power up the control side of the device first. This is the

VCCA.

• OE should ramp with or ahead of VCCA. This will help

guard against bus contention.

• The Transmit/Receive control pin (T/R) should ramp with

VCCA, this will ensure that the A Port data pins are con-

figured as inputs. With VCCA receiving power first, the A

I/O Port should be configured as inputs to help guard

against bus contention and oscillations.

• A side data inputs should be driven to a valid logic level.

This will prevent excessive current draw.

The above steps will ensure that no bus contention or oscil-

lations, and therefore no excessive current draw occurs

during the power up cycling of these devices. These steps

will help prevent possible damage to the translator devices

and potential damage to other system components.

TABLE 1. Low Voltage Translator Power Up Sequencing Table

Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual

Supply CMOS Translating Transceivers.

Symbol

Parameter

CL = 50 pF

Units

VCCA = 4.5V to 5.5V

VCCB = 4.5V to 5.5V

VCCB = 2.7V to 3.6V

TA = +25°CTA = −40°C to +85°CTA = +25°CTA = −40°C to +85°C

Min

Typ

Max

Min

Max

Min

Typ

Max

Min

Max

(Note 6)

(Note 7)

tPHL

Propagation

1.0

4.9

6.5

1.0

7.0

1.0

5.5

7.5

1.0

8.0

ns

tPLH

Delay A to B

1.0

4.0

5.5

1.0

6.0

1.0

5.0

7.0

1.0

7.5

tPHL

Propagation

1.0

4.7

6.5

1.0

7.0

1.0

5.6

7.5

1.0

8.0

ns

tPLH

Delay B to A

1.0

3.9

5.0

1.0

5.5

1.0

4.3

6.0

1.0

6.5

tPZL

Output Enable

1.0

5.6

7.5

1.0

8.0

1.0

6.7

9.0

1.0

10.0

ns

tPZH

Time OE to B

1.0

5.7

7.5

1.0

8.0

1.0

6.9

9.5

1.0

10.0

tPZL

Output Enable

1.0

7.4

9.0

1.0

10.0

1.0

8.0

10.0

1.0

11.0

ns

tPZH

Time OE to A

1.0

6.1

7.5

1.0

8.5

1.0

6.3

8.0

1.0

8.5

tPHZ

Output Disable

1.0

4.8

7.0

1.0

7.5

1.0

6.0

9.0

1.0

9.5

ns

tPLZ

Time OE to B

1.0

3.8

5.5

1.0

6.0

1.0

4.2

6.5

1.0

7.0

tPHZ

Output Disable

1.0

3.4

5.5

1.0

6.0

1.0

3.4

5.5

1.0

6.0

ns

tPLZ

Time OE to A

1.0

2.9

4.5

1.0

5.0

1.0

2.9

5.0

1.0

5.5

tOSHL

Output to Output

tOSLH

Skew (Note 8)

1.0

1.5

1.0

1.5

ns

Data to Output

Symbol

Parameter

Typ

Units

Conditions

CIN

Input Capacitance

4.5

pF

VCC = Open

CI/O

Input/Output Capacitance

10

pF

VCCA = 5V, VCCB = 3.3V

CPD

Power Dissipation Capacitance

A

→B45

pF

VCCA = 5V

(Note 9)

B

→A50

pF

VCCB = 3.3V

Device Type

VCCA

VCCB

T/R

OE

A Side I/O

B Side I/O

Floatable Pin

Allowed

74LVXC4245

5V

2.7V to 5.5V

ramp

logic

outputs

yes, VCCB and B

(power up 1st)

configurable

with VCCA

0V or VCCA

I/O’s w/ OE HIGH

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