HD74ALVCH162244
16-bit Buffers / Drivers with 3-state Outputs
ADE-205-173A (Z)
Preliminary
2nd. Edition
January 1998
Description
The HD74ALVCH162244 is designed specifically to improve both the performance and density of 3-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
active-low output-enable (OE) inputs.
To ensure the high impedance state during power up or power down,
OE
should be tied to V
CC
through a
pullup resistor; the minimum value of the resistor is determined by the current sinking capability of the
driver.
Active bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
All outputs, which are designed to sink up to 12 mA, include 26
Ω
resistors to reduce overshoot and
undershoot.
Features
•
V
CC
= 2.3 V to 3.6 V
•
Typical V
OL
ground bounce < 0.8 V (@V
CC
= 3.3 V, Ta = 25°C)
•
Typical V
OH
undershoot > 2.0 V (@V
CC
= 3.3 V, Ta = 25°C)
•
High output current ±12 mA (@V
CC
= 3.0 V)
•
Bus hold on data inputs eliminates the need for external pullup / pulldown resistors
•
All outputs have equivalent 26
Ω
series resistors, so no external resistors are required.
HD74ALVCH162244
Absolute Maximum Ratings
Item
Supply voltage
Input voltage
*1
Output voltage
*1, 2
Input clamp current
Output clamp current
Continuous output current
V
CC
, GND current / pin
Maximum power dissipation
at Ta = 55°C (in still air)
*3
Storage temperature
Notes:
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or I
GND
P
T
Tstg
Ratings
–0.5 to 4.6
–0.5 to 4.6
–0.5 to V
CC
+0.5
–50
±50
±50
±100
0.85
–65 to 150
Unit
V
V
V
mA
mA
mA
mA
W
°C
TSSOP
V
I
< 0
V
O
< 0 or V
O
> V
CC
V
O
= 0 to V
CC
Conditions
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.
Recommended Operating Conditions
Item
Supply voltage
Input voltage
Output voltage
High level output current
Symbol
V
CC
V
I
V
O
I
OH
Min
2.3
0
0
—
—
—
Low level output current
I
OL
—
—
—
Input transition rise or fall rate
Operating temperature
∆t
/
∆v
Ta
0
–40
Max
3.6
V
CC
V
CC
–6
–8
–12
6
8
12
10
85
ns / V
°C
mA
Unit
V
V
V
mA
V
CC
= 2.3 V
V
CC
= 2.7 V
V
CC
= 3.0 V
V
CC
= 2.3 V
V
CC
= 2.7 V
V
CC
= 3.0 V
Conditions
Note: Unused control inputs must be held high or low to prevent them from floating.
4
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