74ALVT16501_4

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet

Rev. 04 — 8 August 2005

7 of 20

Philips Semiconductors

74ALVT16501

18-bit universal bus transceiver; 3-state

7.

Functional description

7.1 Function table

[1]

H = HIGH voltage level;

h = HIGH voltage level one setup time prior to the enable or clock transition;

L = LOW voltage level;

I = LOW voltage level one setup time prior to the enable or clock transition;

NC = no change;

X = don’t care;

Z = high-impedance OFF-state;

↓ = HIGH-to-LOW enable or clock transition;

↑ = LOW-to-HIGH enable or clock transition.

50

voltage supply

B2

51

data input or output (B side)

B1

52

data input or output (B side)

GND

53

ground (0 V)

B0

54

data input or output (B side)

CPAB

55

A-to-B clock input (active rising edge)

GND

56

ground (0 V)

Table 3:

Symbol

Pin

Description

Table 4:

Function table [1]

Operating mode

Control

Input

Internal

registers

Output

OEAB

LEAB

CPAB

An

Bn

OEBA

LEBA

CPBA

Bn

An

Disabled

L

H

XXXZ

Disabled, latch data

L

↓

Xh

H

Z

lL

Z

Disabled, hold data

L

L

H or L

X

NC

Z

Disabled, clock data

L

L

↑

hH

Z

lL

Z

Transparent

H

H

X

H

H

H

LLL

Latch data and display

H

↓

Xh

H

H

lL

L

Clock data and display

H

L

↑

hH

H

lL

L

Hold data and display

H

L

H or L

X

H

H

XL

L