Fairchild Semiconductor 74VCXH16244MTDX, 74VCXH16244MTD Datasheet

© 2000 Fairchild Semiconductor Corporation DS500230 www.fairchildsemi.com

November 1999
Revised March 2000

74VCXH16244 Low Voltage 16-Bit Buffer/Line Driver wit h Bushold

74VCXH16244
Low Voltage 16-Bit Buffer/Line Driver with Bushold

General Description

The VCXH16244 contains sixteen non-inverting buffers
with 3-STATE outputs to be employ ed as a memory and
address driver, clock driver, or bus oriented transmitter/
receiver. The device is nibble (4-bit) controlled. Each nibble
has separate 3-STATE control inputs which can be shorted
together for full 16-bit operation.

The VCXH16244 data inputs include active bushold cir­cuitry, eliminating the need for external pull-up resistors to
hold unused or floating data inputs at a valid logic level.

The 74VCXH16244 is designed for low voltage (1.65V to

3.6V) V

CC

applications with output capability up to 3.6V.

The 74VCXH16244 i s fabric ated with an advanc ed CMOS
technology to achieve high speed operation while maintain­ing low CMOS power dissipation.

Features

■ 1.65V–3.6V VCC supply operation

■ 3.6V tolerant control inputs and outputs

■ Bushold on data inputs elimin ating the need for externa l

pull-up/pull-down resistors

■ t

PD

2.5 ns max for 3.0V to 3.6V V

CC

3.0 ns max for 2.3V to 2.7V VCC

6.0 ns max for 1.65V to 1.95V V

CC

■ Static Drive (IOH/IOL)

±24 mA @ 3.0V V

CC

±18 mA @ 2.3V V

CC

±6 mA @ 1.65V V

CC

■ Uses patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 300 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.

Logic Symbol Pin Descriptions

Order Number

Package

Package Description

Number

74VCXH16244MTD 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

Bushold Inputs

O

0–O15

Outputs

www.fairchildsemi.com 2

74VCXH16244

Connection Diagram Tr uth Tables

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs may not float)
Z = High Impedance

Functional Description

The 74VCXH16244 contains sixteen no n-inverting buffers
with 3-STATE outputs. The device is nibble (4 bits) con­trolled with each nibble fun cti on ing ide nti ca lly, but indepen­dent of each other. The control pins may be shorted
together to obtain full 16- bit operation.The 3-STAT E out-

puts are controlled by an Output Enable (OE

n

) input. When

OE

n

is LOW, the outputs are in the 2-state mode. When

OE

n

is HIGH, the standard outputs are in the high imped-

ance mode but this does not inte rfere with entering new
data into the inputs.

Logic Diagram

Inputs Outputs

OE

1

I0–I

3

O0–O

3

LL L
LH H
HX Z

Inputs Outputs

OE

3

I8-I

11

O8–O

11

LL L
LH H
HX Z

Inputs Outputs

OE

2

I4-I

7

O4-O

7

LL L
LH H
HX Z

Inputs Outputs

OE

4

I12-I

15

O12-O

15

LL L
LH H
HX Z

3 www.fairchildsemi.com

74VCXH16244

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 Rat-

ings. The “Recommended Operating Conditions” table will define the condi­tions for actual device operation.

Note 2: I

O

Absolute Maximum Rating must be observed.

Note 3: Floating or unused control inputs must be held HIG H or LOW.

DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)

Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 5: An external dri ve r m us t s ink at least the specified cur rent to switch from HIGH -t o-LOW.
Note 6: Outputs disab led or 3-STATE only.

Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V

I

)

OE

n

−0.5V to 4.6V

I

0

– I

15

−0.5V to VCC + 0.5V

Output Voltage (V

O

)
Outputs 3-STATED −0.5V to +4.6V
Outputs Active (Note 2) −0.5V to V

CC

+0.5V

DC Input Diode Current (I

IK

)

V

I

< 0V −50 mA

DC Output Diode Current (I

OK

)

V

O

< 0V −50 mA

V

O

> V

CC

+50 mA

DC Output Source/Sink Current

(I

OH/IOL

) ±50 mA

DC V

CC

or GND Current per

Supply Pin (I

CC

or GND) ±100 mA

Storage Temperature Range (T

STG

) −65°C to +150°C

Power Supply

Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V

Input Voltage −0.3V to V

CC

Output Voltage (VO)

Output in Active States 0V to V

CC

Output in 3-STATE 0.0V to 3.6V

Output Current in I

OH/IOL

VCC = 3.0V to 3.6V ±24 mA
V

CC

= 2.3V to 2.7V ±18 mA

V

CC

= 1.65V to 2.3V ±6 mA

Free Air Operating Temperature (T

A

) −40°C to +85°C

Minimum Input Edge Rate (∆t/∆V)

V

IN

= 0.8V to 2.0V, VCC = 3.0V 10 ns/V

Symbol Parameter Conditions

V

CC

Min Max Units

(V)

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 µA 2.7–3.6 VCC − 0.2 V

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

V

OL

LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2 V

IOL = 12 mA 2.7 0.4 V
IOL = 18 mA 3.0 0.4 V
IOL = 24 mA 3.0 0.55 V

I

I

Input Leakage Current Control Pins 0 ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA

Data Pins VI = VCC or GND 2.7–3.6 ±5.0 µA

I

I(HOLD)

Bushold Input Minimum VIN = 0.8V 3.0 75

µA

Drive Hold Current VIN = 2.0V 3.0 −75

I

I(OD)

Bushold Input Over-Drive (Note 4) 3.6 450

µA

Current to Change State (Note 5) 3.6 −450

I

OZ

3-STATE Output Leakage 0 ≤ VO ≤ 3.6V

2.7–3.6 ±10 µA

VI = VIH or V

IL

I

OFF

Power-OFF Leakage Current 0 ≤ (VO) ≤ 3.6V 0 10 µA

I

CC

Quiescent Supply Current VI = VCC or GND 2.7–3.6 20 µA

VCC ≤ (VO) ≤ 3.6V (Note 6) 2.7–3.6 ±20 µA

∆I

CC

Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 750 µA