Fairchild Semiconductor 74LCXZ16244MTDX, 74LCXZ16244MTD, 74LCXZ16244MEAX, 74LCXZ16244MEA Datasheet

© 2000 Fairchild Semiconductor Corporation DS500252 www.fairchildsemi.com

September 2000
Revised September 2000

74LCXZ16244 Low Voltage 16-Bit Buffer/Line Driver with 5V Tol erant Inputs and Outputs

74LCXZ16244
Low Voltage 16-Bit Buffer/Line Driver

with 5V Tolerant Inputs and Outputs

General Description

The LCXZ16244 contains sixteen non-inverting buffers
with 3-STATE outputs designed to be employed as a mem­ory and address driver, clock driver, or bus oriented trans­mitter/receiver. The device is nibble controlled. Each nibble
has separate 3-STATE control inputs which can be shorted
together for full 16-bit operation.

When V

CC

is between 0 and 1.5V, the LCXZ12644 is in the

high impedance state during power up or power down. This
places the outputs in high impeda nce (Z) state preventi ng
intermittent low impedance loading or glitching in bus o ri­ented applications.

The LCXZ16244 is de signed for low voltage (2 .7V o r 3 .3V )
V

CC

applications with capability of interfacing to a 5V signal
environment.
The LCXZ16244 is fabricated with an advanced CMOS

technology to achieve high speed operation while maintain­ing CMOS low power dissipation.

Features

■ 5V tolerant inputs and outputs

■ Guaranteed power up/down high impedance

■ Supports live insertion/withdrawal

■ 2.7V–3.6V V

CC

specifications provided

■ 4.5 ns t

PD

max (VCC = 3.0V), 20 µA ICC max

■

±24 mA output drive (V

CC

= 3.0V)

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exce eds 500 mA

■ ESD performance:

Human body model

> 2000V

Machine model

> 200V

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Connection Diagram Logic Symbol

Pin Descriptions

Order Number Package Num ber Package Description

74LCXZ16244MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
74LCXZ16244MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Pin Names Description

OE

n

Output Enable Input (Active LOW)

I

0–I15

Inputs

O

0–O15

Outputs

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74LCXZ16244

Truth Tables

H = HIGH Voltage Level
L = LOW Voltage Level

X = Immaterial
Z = High Impedance

Functional Description

The LCXZ16244 contains sixteen non-inverting buffers
with 3-STATE standard outputs. The device is nibble
(4 bits) controlled with each nibble functioning identically,
but independent of the other. The control pins can be
shorted together to obtain full 16-bit operation. The

3-STATE outputs are controlled by an Output Enable (OEn)
input for each nibble. When OE

n

is LOW, the outputs are in

2-state mode. Wh en OE

n

is HIGH, the outputs are in the

high impedance mode, but this does not interfere with
entering new data into the inputs.

Logic Diagram

Inputs Outputs Inputs Outputs

OE

1

I0–I

3

O0–O

3

OE

3

I8–I

11

O8–O

11

LL L LL L
LH H LH H
HX Z HX Z

Inputs Outputs Inputs Outputs

OE

2

I4–I

7

O4–O

7

OE

4

I12–I

15

O12–O

15

LL L LL L
LH H LH H
HX Z HX Z

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74LCXZ16244

Absolute Maximum Ratings(Note 1)

Recommended Operating Conditions (Note 3)

Note 1: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated

at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom-
mended Operating Conditions” table will define the conditions fo r ac t ual device operation.

Note 2: I

O

Absolute Maximum Rating must be observed.

Note 3: Unused inputs must be held HIGH or LOW. They may not float .

DC Electrical Characteristics

Note 4: Outputs disabled or 3-STATE only.

Symbol Parameter Value Conditions Units

V

CC

Supply Voltage −0.5 to +7.0 V

V

I

DC Input Voltage −0.5 to +7.0 V

V

O

DC Output Voltage −0.5 to +7.0 Output in 3-STATE or VCC = 0–1.5V

V

−0.5 to V

CC

+ 0.5 Output in HI GH or LOW State (Note 2)

I

IK

DC Input Diode Current −50 VI < GND mA

I

OK

DC Output Diode Current −50 VO < GND

mA

+50 V

O

> V

CC

I

O

DC Output Source/Sink Current ±50 mA

I

CC

DC Supply Current per Supply Pin ±100 mA

I

GND

DC Ground Current per Ground Pin ±100 mA

T

STG

Storage Temperature −65 to +150 °C

Symbol Parameter Min Max Units

V

CC

Supply Voltage Operating 2.7 3.6 V

V

I

Input Voltage 05.5V

V

O

Output Voltage HIGH or LOW State 0 V

CC

V

3-STATE or V

CC

= OFF 0 5.5

I

OH/IOL

Output Current VCC = 3.0V − 3.6V ±24

mA

V

CC

= 2.7V − 3.0V ±12

T

A

Free-Air Operating Temperature −40 85 °C

∆t/∆V Input Edge Rate, V

IN

= 0.8V–2.0V, VCC = 3.0V 0 10 ns/V

Symbol Parameter Conditions

V

CC

TA = −40°C to +85°C

Units

(V) Min Max

V

IH

HIGH Level Input Voltage 2.7 − 3.6 2.0 V

V

IL

LOW Level Input Voltage 2.7 − 3.6 0.8 V

V

OH

HIGH Level Output Voltage IOH = −100 µA2.7 − 3.6 VCC − 0.2

V

IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2

V

OL

LOW Level Output Voltage IOL = 100 µA2.7 − 3.6 0.2

V

IOL = 12 mA 2.7 0.4
IOL = 16 mA 3.0 0.4
IOL = 24 mA 3.0 0.55

I

I

Input Leakage Current 0 ≤ VI ≤ 5.5V 2.7 − 3.6 ±5.0 µA

I

OZ

3-STATE Output Leakage 0 ≤ VO ≤ 5.5V

2.7 − 3.6 ±5.0 µA

VI = VIH or V

IL

I

OFF

Power-Off Leakage Current VI or VO = 5.5V 0 10 µA

I

PU/PD

Power Up/Down VO = 0.5V to V

CC

0 − 1.5 ±5.0 µA

3-STATE Output Current VI = GND or V

CC

I

CC

Quiescent Supply Current VI = VCC or GND 2.7 − 3.6 225

µA

3.6V ≤ VI, VO ≤ 5.5V (Note 4) 2.7 − 3.6 ±225

∆I

CC

Increase in ICC per Input VIH = VCC −0.6V 2.7 − 3.6 500 µA