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 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 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 V
CC
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
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)
All outputs have equivalent 26
series resistors, so no external resistors are required.
HD74ALVC162836
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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