HIT HD74ALVCH16245 Datasheet

HD74ALVCH16245

16-bit Bus Transceivers with 3-state Outputs

ADE-205-134C (Z)

4th. Edition

December 1999

Description

The HD74ALVCH16245 is designed for asynchronous communication between data buses. The control
function implementation minimizes external timing requirements. This device can be used as two 8-bit
transceivers or one 16-bit transceiver. It allow data transmission from the A bus to the B bus or from the B
bus to the A bus depending upon the logic level at the direction control (DIR) input. The output enable
(OE) input can be used to disable the device so that the buses are effectively isolated. 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 Operation
OE DIR

L L B data to A bus
L H A data to B bus
H X Isolation

H : High level
L : Low level
X : Immaterial

HD74ALVCH16245

Pin Arrangement

1DIR

1B1
1B2

GND

1B3
1B4

V

CC

1B5
1B6

GND

1B7
1B8

2B1
2B2

GND

2B3
2B4

V

CC

2B5
2B6

GND

2B7
2B8

2DIR

10
11

12
13
14

15
16

17
18

19

20
21
22
23
24

1OE

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

1A5
1A6

GND
1A7

1A8
2A1

2A2
GND
2A3

2A4
V

CC

2A5
2A6

GND
2A7

2A8
2OE

(Top view)

2

HD74ALVCH16245

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

Supply voltage V
Input voltage

Output voltage

*1, 2

*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 condition” 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 Except I/O ports
–0.5 to VCC +0.5 I/O ports
–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