HIT HD74ALVC162836 Datasheet

HD74ALVC162836

20-bit Universal Bus Driver with 3-state Outputs

ADE-205-207 (Z)

Preliminary

1st. Edition

January 1998

Description

This 20-bit universal bus driver is designed for 2.3 V to 3.6 V VCC operation.

Data flow from A to Y is controlled by the output enable (OE) input. The device operates in the
transparent mode when the latch enable (LE) input is low. When LE is high, the A data is latched if the
clock (CLK) input is held at a high or low logic level. If LE is high, the A data is stored in the latch flip
flop on the low to high transition of CLK. When OE is high, the outputs are in the high impedance state.

To ensure the high impedance state during power up or power down, OE should be tied to VCC through a
pullup resistor; the minimum value of the resistor is determined by the current sinking capability of the
driver.

All outputs, which are designed to sink up to 12 mA, include 26 Ω resistors to reduce overshoot and
undershoot.

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)

• High output current ±12 mA (@VCC = 3.0 V)

• All outputs have equivalent 26 Ω series resistors, so no external resistors are required.

HD74ALVC162836

Function Table

Inputs Output Y
OE LE CLK A

HXXXZ
LLXLL
LLXHH
LH↑ LL
LH↑ HH
L H L or H X Y0

H : High level
L : Low level
X : Immaterial
Z : High impedance
↑ : Low to high transition
Note: 1. Output level before the indicated steady state input conditions were established.

*1

2

Pin Arrangement

HD74ALVC162836

OE

Y1
Y2

GND

Y3
Y4

V

CC

Y5
Y6

Y7

GND

Y8
Y9

Y10
Y11

Y12
Y13

GND

Y14
Y15
Y16
V

CC

Y17
Y18

GND

Y19
Y20

NC

10
11

12
13
14

15
16

17
18

19

20
21
22
23
24
25
26
27
28

CLK

1
2

3
4
5

6
7

8

9

56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29

A1
A2
GND
A3
A4

V

CC

A5
A6

A7
GND

A8
A9

A10
A11
A12

A13
GND
A14
A15
A16
V

CC

A17
A18
GND
A19
A20

LE

(Top view)

3

HD74ALVC162836

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
1 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
—–6mAV
—–8 V

= 2.3 V

CC

= 2.7 V

CC

— –12 VCC = 3.0 V
— 6 mA VCC = 2.3 V
—8 V
—12 V

= 2.7 V

CC

= 3.0 V

CC

4