HIT HD74LV138A Datasheet
HD74LV138A
3-to-8 line Decoder / Demultiplexers
ADE-205-261 (Z)
1st Edition
March 1999
Description
The HD74LV138A is designed to be used in high-performance memory-decoding or data-routing
applications requiring very short propagation delay times. The conditions at the binary-select inputs and
the three enable inputs select one of eight input lines.
Two active-low and one active-high enable inputs reduce the need for external gates or inverters when
expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder
requires only one inverter.
An enable input can be used as a data input for demultiplexing applications.
Low-voltage and high-speed operation is suitable for the 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 ±6 mA (@VCC = 3.0 V to 3.6 V), ±12 mA (@VCC = 4.5 V to 5.5 V)
HD74LV138A
Function Table
Enable Inputs Select Inputs Outputs
G1 G2A G2BC B A Y0Y1Y2Y3Y4Y5Y6Y7
XHXXXXHHHHHHHH
XXHXXXHHHHHHHH
LXXXXXHHHHHHHH
HLL LLLL HHHHHHH
HLL LLHHLHHHHHH
HLL LHLHHLHHHHH
HLL LHHHHHL HHHH
HLL HLL HHHHLHHH
HLL HLHHHHHHL HH
HLL HHLHHHHHHLH
HLL HHHHHHHHHHL
Note: H: High level
L: Low level
X: Immaterial
Pin Arrangement
G2A
G2B
G1
Y7
GND
V
1
A
2
B
3
C
4
5
6
7
8
(Top view)
16
15
14
13
12
11
10
CC
Y0
Y1
Y2
Y3
Y4
Y5
9
Y6
2
HD74LV138A
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 mayÇΩ be exceeded if the input and output clamp-current
ratings are observed.
2. This value is limited to 5.5 V maximum.
3. The maximum package power dissipation was calculated using a junction temperature of 150°C.
–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
–20 mA VI < 0
±50 mA VO < 0 or VO > V
±25 mA VO = 0 to V
CC
±50 mA
785 mW SOP
500 TSSOP
CC
3
HD74LV138A
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 H or L
— –50 µAV
—–2 mAV
—–6 V
= 2.0 V
CC
= 2.3 to 2.7 V
CC
= 3.0 to 3.6 V
CC
— –12 VCC = 4.5 to 5.5 V
—50 µAV
= 2.0 V
CC
— 2 mA VCC = 2.3 to 2.7 V
—6 V
—12 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
Loading...