HIT HD74ALVCH16244 Datasheet

HD74ALVCH16244

16-bit Buffers / Drivers with 3-state Outputs

ADE-205-133C (Z)

4th. Edition

December 1999

Description

The HD74ALVCH16244 is designed specifically to improve both the performance and density of three
state memory address drivers, clock drivers, and bus oriented receivers and transmitters. The device can be
used as four 4-bit buffers, two 8-bit buffers, or one 16-bit buffer. It provides true outputs and symmetrical
OE (active-low output-enable) inputs. Active bus hold circuitry is provided to hold unused or floating data
inputs at a valid logic level.

Features

• VCC = 2.3 V to 3.6 V

• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)

• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)

• Bus hold on data inputs eliminates the need for external pullup / pulldown resistors

Function Table

Inputs Output Y
OE A

LHH
LLL
HXZ

H : High level
L : Low level
X : Immaterial
Z : High impedance

HD74ALVCH16244

Pin Arrangement

1OE

1Y1
1Y2

GND

1Y3
1Y4

V

CC

2Y1
2Y2

GND

2Y3
2Y4

3Y1
3Y2

GND

3Y3
3Y4
V

CC

4Y1
4Y2

GND

4Y3
4Y4

4OE

10
11

12
13
14
15
16
17
18

19

20
21
22
23
24

2OE

1
2

3
4
5

6
7

8

9

48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25

1A1
1A2
GND
1A3
1A4

V

CC

2A1
2A2

GND
2A3

2A4
3A1

3A2
GND
3A3

3A4
V

CC

4A1
4A2

GND
4A3

4A4
3OE

(Top view)

2

HD74ALVCH16244

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

Supply voltage V
Input voltage
Output voltage

*1

*1, 2

Input clamp current I
Output clamp current I
Continuous output current I
VCC, GND current / pin ICC or I
Maximum power dissipation

at Ta = 55°C (in still air)

*3

CC

V

I

V

O

IK

OK

O

GND

P

T

Storage temperature Tstg –65 to 150 °C
Notes: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage

to the device. These are stress ratings only, and functional operation of the device at these or
any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute maximum rated conditions for extended periods may affect device
reliability.

1. The input and output negative voltage ratings may be exceeded if the input and output clamp
current ratings are observed.

2. This value is limited to 4.6 V maximum.

3. The maximum package power dissipation is calculated using a junction temperature of 150°C
and a board trace length of 750 mils.

–0.5 to 4.6 V
–0.5 to 4.6 V
–0.5 to VCC +0.5 V
–50 mA VI < 0

±50 mA VO < 0 or VO > V
±50 mA VO = 0 to V

CC

±100 mA

0.85 W TSSOP

CC

Recommended Operating Conditions

Item Symbol Min Max Unit Conditions

Supply voltage V
Input voltage V
Output voltage V
High level output current I

Low level output current I

CC

I

O

OH

OL

Input transition rise or fall rate ∆t / ∆v 0 10 ns / V
Operating temperature Ta –40 85 °C

Note: Unused control inputs must be held high or low to prevent them from floating.

2.3 3.6 V
0VCCV
0VCCV
— –12 mA VCC = 2.3 V
— –12 VCC = 2.7 V
— –24 VCC = 3.0 V
—12mAV
—12 V
—24 V

= 2.3 V

CC

= 2.7 V

CC

= 3.0 V

CC

3