HD74ALVCH16245
16-bit Bus Transceivers with 3-state Outputs
ADE-205-134C (Z)
4th. Edition
December 1999
Description
The HD74ALVCH16245 is designed for asynchronous communication between data buses. The control
function implementation minimizes external timing requirements. This device can be used as two 8-bit
transceivers or one 16-bit transceiver. It allow data transmission from the A bus to the B bus or from the B
bus to the A bus depending upon the logic level at the direction control (DIR) input. The output enable
(
OE) input can be used to disable the device so that the buses are effectively isolated. Active bus hold
circuitry is provided to hold unused or floating data inputs at a valid logic level.
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)
Bus hold on data inputs eliminates the need for external pullup / pulldown resistors
Function Table
Inputs
Operation
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
H : High level
L : Low level
X : Immaterial
HD74ALVCH16245
3
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Conditions
Supply voltage
V
CC
0.5 to 4.6
V
Input voltage
*1, 2
V
I
0.5 to 4.6
V
Except I/O ports
0.5 to V
CC
+0.5
I/O ports
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
0.85
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 condition" 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
--
12
mA
V
CC
= 2.3 V
--
12
V
CC
= 2.7 V
--
24
V
CC
= 3.0 V
Low level output current
I
OL
--
12
mA
V
CC
= 2.3 V
--
12
V
CC
= 2.7 V
--
24
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.
HD74ALVCH16245
5
Electrical Characteristics (Ta = 40 to 85
C)
Item
Symbol V
CC
(V)
*1
Min
Max
Unit
Test Conditions
Input voltage
V
IH
2.3 to 2.7
1.7
--
V
2.7 to 3.6
2.0
--
V
IL
2.3 to 2.7
--
0.7
2.7 to 3.6
--
0.8
Output voltage
V
OH
Min to Max V
CC
0.2
--
V
I
OH
= 100
A
2.3
2.0
--
I
OH
= 6 mA, V
IH
= 1.7 V
2.3
1.7
--
I
OH
= 12 mA, V
IH
= 1.7 V
2.7
2.2
--
I
OH
= 12 mA, V
IH
= 2.0 V
3.0
2.4
--
I
OH
= 12 mA, V
IH
= 2.0 V
3.0
2.0
--
I
OH
= 24 mA, V
IH
= 2.0 V
V
OL
Min to Max --
0.2
I
OL
= 100
A
2.3
--
0.4
I
OL
= 6 mA, V
IL
= 0.7 V
2.3
--
0.7
I
OL
= 12 mA, V
IL
= 0.7 V
2.7
--
0.4
I
OL
= 12 mA, V
IL
= 0.8 V
3.0
--
0.55
I
OL
= 24 mA, V
IL
= 0.8 V
Input current
I
IN
3.6
--
5
A
V
IN
= V
CC
or GND
I
IN (hold)
2.3
45
--
V
IN
= 0.7 V
2.3
45
--
V
IN
= 1.7 V
3.0
75
--
V
IN
= 0.8 V
3.0
75
--
V
IN
= 2.0 V
3.6
--
500
V
IN
= 0 to 3.6 V
Off state output current
*2
I
OZ
3.6
--
10
A
V
OUT
= V
CC
or GND
Quiescent supply current I
CC
3.6
--
40
A
V
IN
= V
CC
or GND
I
CC
3.0 to 3.6
--
750
A
V
IN
= one input at (V
CC
0.6) V,
other inputs at V
CC
or GND
Notes: 1. For conditions shown as Min or Max, use the appropriate values under recommended operating
conditions.
2. For I/O ports, the parameter I
OZ
includes the input leakage current.
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