Rev.2.00, Jul.16.2004, page 1 of 9
HD74AC138/HD74ACT138
1-of-8 Decoder/Demultiplexer REJ03D0248–0200Z
(Previous ADE-205-3 68 (Z) )
Rev.2.00
Jul.16.2004
Description
The HD74AC138/HD74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-
speed bipo lar memory chip select address decoding. T he multiple input enables allow parallel expansio n to a 1 -of -24
decoder using just three HD74AC138/HD74ACT138 devices or a 1-of-32 decoder using four
HD74AC138/HD74ACT138 devices and one inverter.
Features
• Demultiplexi ng Capabilit y
• Multiple Input Enable for Easy Expansion
• Active LOW Mutuall y Exclusive Outputs
• Outputs Source/Sink 24 mA
• HD74ACT138 has TTL-Compatible Inputs
• Ordering Information: Ex. HD74AC138
Part Name Package Type Package Code Package Abbreviation Taping Abbreviation (Quantity)
HD74AC138AP DIP-16 pin DP-16E, -16FV P —
HD74AC138AFPEL SOP-16 pin (JEITA) FP-16DAV FP EL (2,000 pcs/reel)
HD74AC138ARPEL SOP-16 pin (JEDEC) FP-16DNV RP EL (2,500 pcs/reel)
HD74AC138TELL TSSOP-16 pin TTP-16DAV T ELL(2,000 pcs/reel)
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Pin Arrangement
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
0
A
1
A
2
E
1
E
2
O
7
E
3
GND
V
CC
O
0
O
1
O
2
O
3
O
4
O
5
O
6
(Top view)
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 2 of 9
Logic Symbol
A
0
A
1
A
2
E
1
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
E
2
E
3
Pin Names
A0 to A2Address Inputs
E1 to E 2 Enable Inputs
E 3 Enable Input
O0 to O 7 Outputs
Functional Description
The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1,
A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 to O7). The
HD74AC138/HD74ACT138 features three Enable inputs, two active-Low (E1, E2) and one active-High (E3). All
outputs will be High unless E1 and E2 are Low and E3 is High. This multiple enabled function allows easy parallel
expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four HD74AC138/HD74ACT138 devices
and one inverter (See Figure a). The HD74AC138/HD74ACT138 can be used as an 8-output demultiplexer by using
one of the active Low Enable inputs as the data input and the other Enable inp uts as strobes. The Enables inputs which
are not used must be permanently tied to their appropr iate active-High or active-Low state.
Truth Table
Inputs Outputs
E
EE
E1E
EE
E 2 E3A0A1A2O
OO
O0O
OO
O 1 O
OO
O 2 O
OO
O 3 O
OO
O 4 O
OO
O 5 O
OO
O 6 O
OO
O 7
HXXXXXH HHHHHHH
XHXXXXH HHHHHHH
XXLXXXH HHHHHHH
LLHLLLL HHHHHHH
LLHHLLHLHHHHHH
LLHLHLHHLHHHHH
LLHHHLHHHLHHHH
LLHLLHHHHHLHHH
LLHHLHHHHHHLHH
LLHLHHHHHHHHLH
LLHHHHH HHHHHHL
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 3 of 9
Logic Diagram
A2A1A0E1
O0O1O2O3O4O5O6O7
E2E3
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Figure a: Expansion of 1-of-32 Decoding
A
0
E
O0O31
H
A
1
A
2
A
3
A
4
123
E
123
O0O1O2O3O4O5O6O7
E
123
A0A1A2
O0O1O2O3O4O5O6O7
A0A1A2
O0O1O2O3O4O5O6O7
A0A1A2
O0O1O2O3O4O5O6O7
A0A1A2E
123
Õ04
Absolute Maximum Ratings
Item Symbol Ratings Unit Condition
Supply voltage VCC –0.5 to 7 V
–20 mA VI = –0.5VDC input diode current IIK 20 mA VI = Vcc+0.5V
DC input voltage VI–0.5 to Vcc+0.5 V
–50 mA VO = –0.5VDC output diode current IOK 50 mA VO = Vcc+0.5V
DC output voltage VO–0.5 to Vcc+0.5 V
DC output source or sink current IO±50 mA
DC VCC or ground current per output pin ICC, IGND ±50 mA
Storage temperature Tstg –65 to +150 °C
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 4 of 9
Recommended Operating Conditions: HD74AC138
Item Symbol Ratings Unit Condition
Supply voltage VCC 2 to 6 V
Input and output voltage VI, VO0 to VCC V
Operating temperature Ta –40 to +85 °CVCC = 3.0V
VCC = 4.5 V
Input rise and fall time
(except Schmitt inputs)
VIN 30% to 70% VCC
tr, tf 8 ns/V
VCC = 5.5 V
DC Characteristics: HD74AC138
Ta = 25°
°°
°C Ta = –40 to
+85°
°°
°C
Item Sym-
bol Vcc
(V) min. typ. max. min. max.
Unit Condition
3.0 2.1 1.5 — 2.1 —
4.5 3.15 2.25 — 3.15 —
VIH
5.5 3.85 2.75 — 3.85 —
VOUT = 0.1 V or VCC –0.1 V
3.0 — 1.50 0.9 — 0.9
4.5 — 2.25 1.35 — 1.35
Input Voltage
VIL
5.5 — 2.75 1.65 — 1.65
V
VOUT = 0.1 V or VCC –0.1 V
3.0 2.9 2.99 — 2.9 —
4.5 4.4 4.49 — 4.4 —
5.5 5.4 5.49 — 5.4 —
VIN = VIL or VIH
IOUT = –50 µA
3.0 2.58 — — 2.48 — IOH = –12 mA
4.5 3.94 — — 3.80 — IOH = –24 mA
VOH
5.5 4.94 — — 4.80 —
VIN = VIL or VIH
IOH = –24 mA
3.0 — 0.002 0.1 — 0.1
4.5 — 0.001 0.1 — 0.1
5.5 — 0.001 0.1 — 0.1
VIN = VIL or VIH
IOUT = 50 µA
3.0 — — 0.32 — 0.37 IOL = 12 mA
4.5 — — 0.32 — 0.37 IOL = 24 mA
Output voltage
VOL
5.5 — — 0.32 — 0.37
V
VIN = VIL or VIH
IOL = 24 mA
Input leakage
current IIN 5.5 — — ±0.1 — ±1.0 µAV
IN = VCC or GND
IOLD 5.5———86—mAV
OLD = 1.1 VDynamic outp ut
current*IOHD 5.5 — — — –75 — mA VOHD = 3.85 V
Quiescent su pply
current ICC 5.5 — — 8.0 — 80 µAV
IN = VCC or ground
*Maximum test duration 2.0 ms, one output loaded at a time.
Recommended Operating Conditions: HD74ACT138
Item Symbol Ratings Unit Condition
Supply voltage VCC 2 to 6 V
Input and output voltage VI, VO0 to VCC V
Operating temperature Ta –40 to +85 °C
Input rise and fall time
(except Schmitt inputs)
VIN 0.8 to 2.0 V
tr, tf 8 ns/V VCC = 4.5V
VCC = 5.5V
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 5 of 9
DC Characteristics: HD74ACT138
Ta = 25°
°°
°C Ta = –40 to
+85°
°°
°C
Item Sym-
bol VCC
(V) min. typ. max. min. max.
Unit Condition
4.5 2.0 1.5 — 2.0 —VIH 5.5 2.0 1.5 — 2.0 — VOUT = 0.1 V or Vcc–0.1 V
4.5 — 1.5 0.8 — 0.8
Input voltage
VIL 5.5 — 1.5 0.8 — 0.8
V
VOUT = 0.1 V or Vcc–0.1 V
4.5 4.4 4.49 — 4.4 —
5.5 5.4 5.49 — 5.4 — VIN = VIL or VIH
IOUT = –50 µA
4.5 3.94 — — 3.80 — IOH = –24 mA
VOH
5.5 4.94 — — 4.80 — VIN = VIL IOH = –24 mA
4.5 — 0.001 0.1 — 0.1
5.5 — 0.001 0.1 — 0.1 VIN = VIL or VIH
IOUT = 50 µA
4.5 — — 0.32 — 0.37 IOL = 24 mA
Output voltage
VOL
5.5 — — 0.32 — 0.37
V
VIN = VIL IOL = 24 mA
Input current IIN 5.5 — — ±0.1 — ±1.0 µAV
IN = VCC or GND
ICC/input current ICCT 5.5 — 0.6 — — 1.5 mA VIN = VCC–2.1 V
IOLD 5.5 — — — 86 — mA VOLD = 1.1 VDynamic outp ut
current*IOHD 5.5 — — — –75 — mA VOHD = 3.85 V
Quiescent su pply
current ICC 5.5 — — 8.0 — 80 µAV
IN = VCC or ground
*Maximum test duration 2.0 ms, one output loaded at a time.
AC Characteristics: HD74AC138
Ta = +25°C
CL = 50 pF Ta = –40°C to +85°C
CL = 50 pF
Item Symbol VCC (V)*1Min Typ Max Min Max Unit
Propagation delay tPLH 3.3 1.0 8.5 13.0 1.0 15.0 ns
An to On5.0 1.0 6.5 9.5 1.0 10.5
Propagation delay tPHL 3.3 1.0 8.0 12.5 1.0 14.0 ns
An to On5.0 1.0 6.0 9.0 1.0 10.5
Propagation delay tPLH 3.3 1.0 11.0 15.0 1.0 16.0 ns
E1 or E 2 to On5.0 1.0 8.0 11.0 1.0 12.0
Propagation delay tPHL 3.3 1.0 9.5 13.5 1.0 15.0 ns
E1 or E 2 to On5.0 1.0 7.0 9.5 1.0 10.5
Propagation delay tPLH 3.3 1.0 11.0 15.5 1.0 16.5 ns
E3 to On5.0 1.0 8.0 11.0 1.0 12.5
Propagation delay tPHL 3.3 1.0 8.5 13.0 1.0 14.0 ns
E3 to On5.0 1.0 6.0 8.0 1.0 9.5
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 6 of 9
AC Characteristics: HD74ACT138
Ta = +25°C
CL = 50 pF Ta = –40°C to +85°C
CL = 50 pF
Item Symbol VCC (V)*1Min Typ Max Min Max Unit
Propagation delay
An to On
tPLH 5.0 1.0 7.0 10.5 1.0 11.5 ns
Propagation delay
An to On
tPHL 5.0 1.0 6.5 10.5 1.0 11.5 ns
Propagation delay
E1 or E 2 to On
tPLH 5.0 1.0 8.0 11.5 1.0 12.5 ns
Propagation delay
E1 or E 2 to On
tPHL 5.0 1.0 7.5 11.5 1.0 12.5 ns
Propagation delay
E3 to On
tPLH 5.0 1.0 8.0 12.0 1.0 13.0 ns
Propagation delay
E3 to On
tPHL 5.0 1.0 6.5 10.5 1.0 11.5 ns
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item Symbol Typ Unit Condition
Input capacitan ce CIN 4.5 pF VCC = 5.5 V
Power dissipation capacitance CPD 60.0 pF VCC = 5.0 V
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 7 of 9
Package Dime nsions
16
18
9
19.2
20.32 Max
6.3
7.4 Max
5.06 Max2.54 Min
0.51 Min
Package Code
JEDEC
JEITA
Mass
(reference value)
DP-16E
Conforms
Conforms
1.05 g
2.54 ± 0.25 0.48 ± 0.1
0.89 1.3 7.62
0.25+ 0.1
– 0.05
0˚ – 15˚
As of January, 2003
Unit: mm
16
18
9
19.2
20.32 Max
6.3
7.4 Max
5.06 Max2.54 Min
0.51 Min
Package Code
JEDEC
JEITA
Mass
(reference value)
DP-16FV
Conforms
Conforms
1.05 g
2.54 ± 0.25
*NI/Pd/AU Plating
*0.48 ± 0.08
0.89 1.3 7.62
*0.25
± 0.06
0˚ – 15˚
Unit: mm
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 8 of 9
Package Code
JEDEC
JEITA
Mass
(reference value)
FP-16DAV
—
Conforms
0.24 g
*Ni/Pd/Au plating
*0.20 ± 0.05
*0.40 ± 0.06
0.12
0.15
M
2.20 Max
5.5
10.06
0.80 Max
16 9
18
10.5 Max
+ 0.20
– 0.30
7.80
0.70 ± 0.20
0˚ – 8˚
0.10 ± 0.10
1.15
1.27
As of January, 2003
Unit: mm
Package Code
JEDEC
JEITA
Mass
(reference value)
FP-16DNV
Conforms
Conforms
0.15 g
*Ni/Pd/Au plating
1.27
16 9
18
0.15
0.25
M
1.75 Max 3.95
*0.20 ± 0.05
9.9
0˚ – 8˚
10.3 Max
+ 0.10
– 0.30
6.10
+ 0.67
– 0.20
0.60
+ 0.11
– 0.04
0.14
*0.40 ± 0.06
0.635 Max
1.08
As of January, 2003
Unit: mm
HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 9 of 9
Package Code
JEDEC
JEITA
Mass
(reference value)
TTP-16DAV
—
—
0.05 g
*Ni/Pd/Au plating
0.50 ± 0.10
0˚ – 8˚
*0.15 ± 0.05
6.40 ± 0.20
0.10
1.10 Max
0.13 M
0.65
18
16 9
4.40
5.00
5.30 Max
0.07+0.03
–0.04
0.65 Max
1.0
*0.20 ± 0.05
As of January, 2003
Unit: mm
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