74LVCH8T245PW datasheet(4/28 Pages) NXP

부품명	74LVCH8T245PW

상세설명	8-bit dual supply translating transceiver; 3-state

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74LVC_LVCH8T245

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3 — 12 December 2011

4 of 28

NXP Semiconductors

74LVC8T245; 74LVCH8T245

8-bit dual supply translating transceiver; 3-state

5.2 Pin description

[1]

All GND pins must be connected to ground (0 V).

6.

Functional description

[1]

H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.

[2]

The An inputs/outputs, DIR and OE input circuit is referenced to VCC(A); The Bn inputs/outputs circuit is referenced to VCC(B).

[3]

If at least one of VCC(A) or VCC(B) is at GND level, the device goes into suspend mode.

7.

Limiting values

Table 2.

Pin description

Symbol

Description

VCC(A)

1

supply voltage A (An inputs/outputs, OE and DIR inputs are referenced to VCC(A))

DIR

2

direction control

A1 to A8

3, 4, 5, 6, 7, 8, 9, 10

data input or output

GND[1]

11

ground (0 V)

GND[1]

12

ground (0 V)

GND[1]

13

ground (0 V)

B1 to B8

21, 20, 19, 18, 17, 16, 15, 14 data input or output

OE

22

output enable input (active LOW)

VCC(B)

23

supply voltage B (Bn inputs/outputs are referenced to VCC(B))

VCC(B)

24

supply voltage B (Bn inputs/outputs are referenced to VCC(B))

Table 3.

Function table[1]

Supply voltage

Input

Input/output[3]

VCC(A), VCC(B)

OE[2]

DIR[2]

An[2]

Bn[2]

1.2 V to 5.5 V

L

An = Bn

input

1.2 V to 5.5 V

L

H

input

Bn = An

1.2 V to 5.5 V

H

X

Z

GND[3]

XXZ

Z

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol

Parameter

Conditions

Min

Max

Unit

VCC(A)

supply voltage A

0.5

+6.5

V

VCC(B)

supply voltage B

0.5

+6.5

V

IIK

input clamping current

VI <0V

50

-

mA

VI

input voltage

[1]

0.5

+6.5

V

IOK

output clamping current

VO <0V

50

-

mA

VO

output voltage

Active mode

[1][2][3]

0.5

VCCO +0.5

V

Suspend or 3-state mode

[1]

0.5

+6.5

V

IO

output current

VO =0Vto VCCO

[2] -

50

mA

ICC

supply current

ICC(A) or ICC(B); per VCC pin

-

100

mA

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