MC74LCX16500 Просмотр технического описания (PDF) - Motorola => Freescale

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MC74LCX16500

Low–Voltage CMOS 18–Bit Universal Bus Transceiver

Motorola => Freescale 

MC74LCX16500

FUNCTION TABLE

OEAB

OEBA

Inputs

LEAB LEBA

CAB

CBA

Data Ports

An

Bn

Operating Mode

L

H

Input Input

H or L H or L

X

X Hold Data; A and B Outputs Disabled

L

L

↓

↓

l

h

l

h

Clock A and/or B Data; A and B Outputs Disabled

H

H

Input Output

H or L

X*

X

QA Hold and Display B Data

L

X

↓

X*

l

h

L

H

Clock A Data to B Bus; Store A Data

H

X

X

X*

L

H

L

H

A Data to B Bus; (Transparent)

L

L

Output Input

X*

H or L QB

X Hold and Display A Data

X

L

X*

↓

L

H

l

h

Clock B Data to A Bus; Store B Data

X

H

X*

X

L

H

L

H

B Data to A Bus; (Transparent)

H

L

Output Output

L

L

H or L H or L QB

QA Stored A Data to B Bus; Stored B Data to A Bus

H = High Voltage Level; L = Low Voltage Level; h = High Voltage Level One Setup Time Prior to the Latch Enable or Clock High–to–Low Transition; l = Low Voltage

Level One Setup Time Prior to the Latch Enable or Clock High–to–Low Transition; X = Don’t Care; ↓ = High–to–Low Clock Transition; QA = A Input Storage Register;

QB = B Input Storage Register; * = The clocks are not internally gated with either the Output Enables or the Source Inputs. Therefore, data at the A or B ports may be

clocked into the storage registers, at any time. For ICC reasons, Do Not Float Inputs.

LCX DATA

3

BR1339 — REV 3

MOTOROLA

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