74ALVCH16843DL 查看數據表（PDF） - Philips Electronics

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74ALVCH16843DL

18-bit bus-interface D-type latch (3-State)

Philips Electronics 

Philips Semiconductors

18-bit bus interface D-type latch (3-State)

Product specification

74ALVCH16843

AC WAVEFORMS FOR VCC = 2.3V TO 2.7V AND

VCC < 2.3V RANGE

VM = 0.5 V

VX = VOL + 0.15V

VY = VOH –0.15V

VOL and VOH are the typical output voltage drop that occur with the

output load.

VI = VCC

AC WAVEFORMS FOR VCC = 3.0V TO 3.6V AND

VCC = 2.7V RANGE

VM = 1.5 V

VX = VOL + 0.3V

VY = VOH –0.3V

VOL and VOH are the typical output voltage drop that occur with the

output load.

VI = 2.7V

CLR, Dn VI

VM

PRE GND

VOH

Qn OUTPUT

tPHL

VM

tPLH

VOL

SH00147

Waveform 1. Data input (Dn) to output (Qn), clear input (CLR)

to output (Qn) and preset input (PRE) to output (Qn)

propagation delay

VI

LE INPUT

GND

VOH

Qn OUTPUT

VOL

VM

tW

tPHL

VM

VM

tPLH

SH00150

Waveform 2. Latch enable input (LE) pulse width, the latch

enable input to output (Qn) propagation delay

ÉÉÉ VI

Dn

ÉÉÉ INPUT

VM

ÉÉÉ GND

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

th

th

tSU

tSU

VI

LE

INPUT

VM

GND

NOTE: The shaded areas indicate when the input is permitted to change

for predictable output performance.

SH00149

Waveform 3. Data set-up and hold times for the Dn input to the

LE input

VI

CLR, PRE

VM

GND

VI

LE

tW(L)

tREM

VM

GND

SH00148

Waveform 4. Clear (CLR) and preset (PRE) pulse width, the

clear (CLR) and preset (PRE) to latch (LE) removal time

VI

nOE INPUT

VM

GND

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

tPLZ

VX

tPZL

VM

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPHZ

outputs

enabled

tPZH

VY

VM

outputs

disabled

outputs

enabled

SH00137

Waveform 5. 3-State enable and disable times

1998 Aug 04

8

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