HD74ALVCH162827
20-bit Buffers / Drivers with 3-state Outputs
ADE-205-188B (Z)
3rd. Edition
December 1999
Description
The HD74ALVCH162827 is composed of two 10-bit sections with separate output enable signals. For
either 10-bit buffer section, the two output enable (1
OE1 and 1OE2 or 2OE1 and 2OE2) inputs must both
be low for the corresponding Y outputs to be active. If either output enable input is high, the outputs of that
10-bit buffer section are in the high impedance state. 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
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
series resistors, so no external resistors are required.
HD74ALVCH162827
4
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Conditions
Supply voltage
V
CC
0.5 to 4.6
V
Input voltage
*1
V
I
0.5 to 4.6
V
Output voltage
*1, 2
V
O
0.5 to V
CC
+0.5
V
Input clamp current
I
IK
50
mA
V
I
< 0
Output clamp current
I
OK
±
50
mA
V
O
< 0 or V
O
> V
CC
Continuous output current
I
O
±
50
mA
V
O
= 0 to V
CC
V
CC
, GND current / pin
I
CC
or I
GND
±
100
mA
Maximum power dissipation
at Ta = 55
°
C (in still air)
*3
P
T
1
W
TSSOP
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.
Recommended Operating Conditions
Item
Symbol
Min
Max
Unit
Conditions
Supply voltage
V
CC
2.3
3.6
V
Input voltage
V
I
0
V
CC
V
Output voltage
V
O
0
V
CC
V
High level output current
I
OH
--
6
mA
V
CC
= 2.3 V
--
8
V
CC
= 2.7 V
--
12
V
CC
= 3.0 V
Low level output current
I
OL
--
6
mA
V
CC
= 2.3 V
--
8
V
CC
= 2.7 V
--
12
V
CC
= 3.0 V
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.
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