HD74AVC16835
18-bit Universal Bus Driver with 3-state Outputs
ADE-205-292 (Z)
Preliminary
1st. Edition
May 1999
Description
The HD74AVC16835 is a 18-bit universal bus driver is operational at 1.2 V to 3.6 V V
CC
, but designed spe-
cifically for 1.65 V to 3.6 V V
CC
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 high. The A data is latched if the clock (CLK) input is held at a high
or low logic level. If LE is low, 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 V
CC
through a
pullup registor; the minimum value of the registor is determined by the current sinking capability of the driv-
er.
Features
•
•
•
Overvoltage tolerant inputs / outputs allow mixed voltage mode data communications
I
off
feature supports partial power down mode operation
High output current
±12
mA (@V
CC
= 3.0 V)
Function Table
Inputs
OE
H
L
L
L
L
L
LE
X
H
H
L
L
L
CLK
X
X
X
↑
↑
L or H
A
X
L
H
L
H
X
Output Y
Z
L
H
L
H
Y
0 *1
H:
L:
X:
Z:
↑
:
High level
Low level
Immaterial
High impedance
Low to high transition
HD74AVC16835
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage range
*1
Output voltage range
*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 range
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 4.6
–0.5 to V
CC
+0.5
–50
–50
±50
±100
1
–65 to 150
mA
mA
mA
mA
W
°C
TSSOP
Unit
V
V
V
Output “Z” or V
CC
: OFF
Output “H” or “L”
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 condition” is not implied. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.
Notes: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp
current ratings are observed.
2. The input and output positive-voltage ratings may be exceeded up to 4.6 V if the input and output
clamp-current ratings are observed.
3. The maximum power dissipation is calculated using a junction temperature of 150°C and board
trace length of 750 mils.
Recommended Operating Conditions
Item
Supply voltage
Input voltage
Output voltage
Static high-level output current
*1
Symbol
V
CC
V
I
V
O
I
OHS
Min
1.65
0.2
0
0
0
—
—
—
Static low-level output current
*1
Max
3.6
—
3.6
V
CC
3.6
–4
–8
–12
4
8
12
5
85
Unit
V
V
V
mA
Conditions
Operating
Data retention only
Active state
3–state
V
CC
= 1.65 to 1.95 V
V
CC
= 2.3 to 2.7 V
V
CC
= 3 to 3.6 V
I
OLS
—
—
—
mA
V
CC
= 1.65 to 1.95 V
V
CC
= 2.3 to 2.7 V
V
CC
= 3 to 3.6 V
Input transition rise or fall rate
Operating free-air temperature
∆t/∆v
Ta
—
–40
ns/V
°C
V
CC
= 1.65 to 3.6 V
All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation.
Note: 1. Dynamic drive capability is equivalent to standard outputs with I
OH
and I
OL
of
±24
mA at 2.5 V
V
CC
.
3
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