HIT HD74LV245A Datasheet
HD74LV245A
Octal Bus Transceivers with 3-state Outputs
ADE-205-247 (Z)
1st Edition
March 1999
Description
The HD74LV245A has eight buffers with three-state outputs in a 20-pin package. When DIR is high, data
is transferred from the A inputs to the B outputs, and when DIR is low, data is transferred from the B inputs
to the A outputs. The A and B buses are separated by making the enable input (OE) high level. Lowvoltage operation is suitable for battery-powered products (e.g., notebook computers), and the low power
consumption extends the battery life.
Features
• VCC = 2.0 V to 5.5 V operation
• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)
• All outputs VO (Max.) = 5.5 V (@VCC = 0 V)
• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical VOH undershoot > 2.3 V (@VCC = 3.3 V, Ta = 25°C)
• Output current ±8 mA (@VCC = 3.0 V to 3.6 V), ±16 mA (@VCC = 4.5 V to 5.5 V)
Function Table
Inputs
OE DIR Operation
L L B data to A bus
L H A data to B bus
H X Isolation
Note: H: High level
L: Low level
X: Immaterial
HD74LV245A
Pin Arrangement
DIR
V
1
20
CC
A1
A2
A3
A4
A5
A6
A7
A8
GND
10
2
3
4
5
6
7
8
9
(Top view)
19
18
17
16
15
14
13
12
11
OE
B1
B2
B3
B4
B5
B6
B7
B8
2
HD74LV245A
Absolute Maximum Ratings
Item Symbol Ratings Unit Conditions
Supply voltage range V
Input voltage range*
Output voltage range*
1
1, *2
Input clamp current I
Output clamp current I
Continuous output current I
Continuous current through
V
or GND
CC
Maximum power dissipation
at Ta = 25°C (in still air)*
3
CC
V
I
V
O
IK
OK
O
or I
I
CC
GND
P
T
Storage temperature Tstg –65 to 150 °C
Notes: The absolute maximum ratings are values which must not individually be exceeded, and furthermore,
no two of which may be realized at the same time..
1. The input and output voltage ratings may be exceeded even if the input and output clamp-current
ratings are observed.
2. This value is limited to 5.5 V maximum.
3. The data above are measured by ∆V
mm) with 10% of wiring density.
–0.5 to 7.0 V
–0.5 to 7.0 V
–0.5 to VCC + 0.5 V Output: H or L
–0.5 to 7.0 VCC: OFF or Output: Z
–20 mA VI < 0
±50 mA VO < 0 or VO > V
±35 mA VO = 0 to V
CC
±70 mA
835 mW SOP
757 TSSOP
method mounting on glass epoxy board (40 × 40 × 1.6
BE
CC
3
HD74LV245A
Recommended Operating Conditions
Item Symbol Min Max Unit Conditions
Supply voltage range V
Input voltage range V
Output voltage range V
Output current I
CC
I
O
OH
I
OL
Input transition rise or fall rate ∆t /∆v 0 200 ns/V VCC = 2.3 to 2.7 V
Operating free-air temperature Ta –40 85 °C
Note: Unused or floating inputs must be held high or low.
2.0 5.5 V
0 5.5 V
0VCCV Output: H or L
0 5.5 High impedance state
— –50 µAV
—–2 mAV
—–8 V
= 2.0 V
CC
= 2.3 to 2.7 V
CC
= 3.0 to 3.6 V
CC
— –16 VCC = 4.5 to 5.5 V
—50 µAV
= 2.0 V
CC
— 2 mA VCC = 2.3 to 2.7 V
—8 V
—16 V
= 3.0 to 3.6 V
CC
= 4.5 to 5.5 V
CC
0 100 VCC = 3.0 to 3.6 V
020 V
= 4.5 to 5.5 V
CC
4
Logic Diagram
E
DIR
A1
HD74LV245A
1
19
O
2
18
B1
Other seven channels
5
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