Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
MAY 1992
1992 Integrated Device Technology, Inc.
7.3
DSC-4625/3
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor Co.
FEATURES:
IDT54/74FCT138 equivalent to FAST
TM
speed
IDT54/74FCT138A 35% faster than FAST
IDT54/74FCT138C 40% faster than FAST
Equivalent to FAST speeds output drive over full tem-
perature and voltage supply extremes
I
OL
= 48mA (commercial) and 32mA (military)
CMOS power levels (1mW typ. static)
TTL input and output level compatible
CMOS output level compatible
Substantially lower input current levels than FAST
(5
A max.)
JEDEC standard pinout for DIP and LCC
Product available in Radiation Tolerant and Radiation
Enhanced versions
Military product compliant to MIL-STD-883, Class B
Standard Military Drawing # 5962-87654 is listed on this
function. Refer to section 2.
DESCRIPTION:
The IDT54/74FCT138/A/C are 1-of-8 decoders built using
an advanced dual metal CMOS technology. The IDT54/
74FCT138/A/C accept three binary weighted inputs (A
0
, A
1
,
A
2
) and, when enabled, provide eight mutually exclusive
active LOW outputs (
O
0
-
O
7
). The IDT54/74FCT138/A/C
feature three enable inputs, two active LOW (
E
1
,
E
2
) and one
active HIGH (E
3
). All outputs will be HIGH unless
E
1
and
E
2
are LOW and E
3
is HIGH. This multiple enable function allows
easy parallel expansion of the device to a 1-of-32 (5 lines to
32 lines) decoder with just four IDT54/74FCT138/A/C devices
and one inverter.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
DIP/SOIC/CERPACK
TOP VIEW
4
5
6
7
8
L20-2
18
17
16
15
14
INDEX
2581 drw 01
E
3
NC
NC
Vcc
NC
GND
NC
A
2
E
1
E
2
A
0
A
1
O
0
O
1
O
2
O
3
O
4
O
7
O
5
O
6
9 10 11 12 13
3
2
1
20 19
LCC
TOP VIEW
IDT54/74FCT138
IDT54/74FCT138A
IDT54/74FCT138C
FAST CMOS
1-OF-8 DECODER
WITH ENABLE
2581 drw 02
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
E
1
E
2
E
3
A
0
A
1
A
2
5
6
7
8
A
0
A
1
1
2
3
4
16
15
14
13
12
11
10
9
Vcc
P16-1,
D16-1,
SO16-1
&
E16-1
A
2
E
1
E
2
GND
O
0
O
1
O
2
O
3
O
4
O
O
6
O
7
5
E
3
1
7.3
2
IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
Description
A
0
A
2
Address Inputs
E
1
,
E
2
Enable Inputs (Active LOW)
E
3
Enable Input (Active HIGH)
O
0
O
7
Outputs (Active LOW)
2581 tbl 05
FUNCTION TABLE
Inputs
Outputs
E
E
1
E
E
2
E
3
A
0
A
1
A
2
O
O
0
O
O
1
O
2
O
O
3
O
O
4
O
O
5
O
O
6
O
O
7
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
L
L
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
2581 tbl 06
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
Commercial
Military
Unit
V
TERM
(2)
Terminal Voltage
0.5 to +7.0 0.5 to +7.0
V
with Respect
to GND
V
TERM
(3)
Terminal Voltage
0.5 to V
CC
0.5 to V
CC
V
with Respect
to GND
T
A
Operating
0 to +70
55 to +125
C
Temperature
T
BIAS
Temperature
55 to +125 65 to +135
C
Under Bias
T
STG
Storage
55 to +125 65 to +150
C
Temperature
P
T
Power Dissipation
0.5
0.5
W
I
OUT
DC Output Current
120
120
mA
NOTES:
2581 tbl 01
1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability. No terminal voltage
may exceed V
CC
by +0.5V unless otherwise noted.
2. Inputs and V
CC
terminals only.
3. Outputs and I/O terminals only.
CAPACITANCE
(T
A
= +25
C, f = 1.0MHz)
Symbol
Parameter
(1)
Conditions
Typ. Max. Unit
C
IN
Input Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output Capacitance V
OUT
= 0V
8
12
pF
NOTE:
2581 tbl 02
1. This parameter is guaranteed characterization data and not tested.
IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.3
3
POWER SUPPLY CHARACTERISTICS
V
LC
= 0.2V; V
HC
= V
CC
0.2V
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
Vcc = Max.
--
0.2
1.5
mA
V
IN
V
HC
; V
IN
V
LC
I
CC
Quiescent Power Supply Current
Vcc = Max.
--
0.5
2.0
mA
TTL Inputs HIGH
V
IN
= 3.4V
(3)
I
CCD
Dynamic Power Supply Current
(4)
Vcc = Max.
V
IN
V
HC
--
0.15
0.3
mA/MHz
Outputs Open
V
IN
V
LC
One Output Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(5)
Vcc = Max.
V
IN
V
HC
--
1.7
4.5
mA
Outputs Open
V
IN
V
LC
Toggle
E
1
,
E
2
or E
3
(FCT)
50% Duty Cycle
V
IN
= 3.4V
--
2.0
5.5
f
O
= 10MHz
V
IN
= GND
One Output Toggling
NOTES:
2581 tbl 04
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25
C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
5. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
O
N
O
)
I
CC
= Quiescent Current
I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Output Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
O
= Output Frequency
N
O
= Number of Outputs at f
O
All currents are in milliamps and all frequencies are in megahertz.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: V
LC
= 0.2V; V
HC
= V
CC
0.2V
Commercial: T
A
= 0
C to +70
C, V
CC
= 5.0V
5%; Military: T
A
= 55
C to +125
C, V
CC
= 5.0V
10%
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH Level
2.0
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW Level
--
--
0.8
V
I
IH
Input HIGH Current
V
CC
= Max.
V
I
= V
CC
--
--
5
A
V
I
= 2.7V
--
--
5
(4)
I
IL
Input LOW Current
V
I
= 0.5V
--
--
5
(4)
V
I
= GND
--
--
5
V
IK
Clamp Diode Voltage
V
CC
= Min., I
N
= 18mA
--
0.7
1.2
V
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
O
= GND
60
120
--
mA
V
OH
Output HIGH Voltage
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OH
= 32
A
V
HC
V
CC
--
V
V
CC
= Min.
I
OH
= 300
A
V
HC
V
CC
--
V
IN
= V
IH
or V
IL
I
OH
= 12mA MIL.
2.4
4.3
--
I
OH
= 15mA COM'L.
2.4
4.3
--
V
OL
Output LOW Voltage
V
CC
= 3V, V
IN
= V
LC
or V
HC
, I
OL
= 300
A
--
GND
V
LC
V
V
CC
= Min.
I
OL
= 300
A
--
GND
V
LC
(4)
V
IN
= V
IH
or V
IL
I
OL
= 32mA MIL.
--
0.3
0.5
I
OL
= 48mA COM'L.
--
0.3
0.5
NOTES:
2581 tbl 03
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25
C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. This parameter is guaranteed but not tested.
7.3
4
IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
t
PLH
Propagation Delay
C
L
= 50pF
1.5
9.0
1.5
12.0
1.5
5.8
1.5
7.8
1.5
5.1
1.5
6.0
ns
t
PHL
A
n
to
O
n
R
L
= 500
t
PLH
Propagation Delay
1.5
9.0
1.5
12.5
1.5
5.9
1.5
8.0
1.5
5.2
1.5
6.1
ns
t
PHL
E
1
or
E
2
to
O
n
t
PLH
Propagation Delay
1.5
9.0
1.5
12.5
1.5
5.9
1.5
8.0
1.5
5.2
1.5
6.1
ns
t
PHL
E
3
to
O
n
NOTES:
2581 tbl 07
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT54/74FCT138
IDT54/74FCT138A
IDT54/74FCT138C
Com'l.
Mil.
Com'l.
Mil.
Com'l.
Mil.
Symbol
Parameter
Condition
(1)
Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max.
Min.
(2)
Max. Min
.
(2)
Max.
Unit
IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
7.3
5
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
ENABLE AND DISABLE TIMES
PROPAGATION DELAY
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
Pulse
Generator
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
t
SU
t
H
t
REM
H
t
SU
R
T
D.U.T.
V
CC
V
IN
C
L
V
OUT
50pF
500
500
7.0V
SAME PHASE
INPUT TRANSITION
3V
1.5V
0V
1.5V
V
OH
V
OL
t
PLH
t
PHL
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
V
OL
V
OH
3V
1.5V
0V
t
PLH
t
PHL
0.3V
0.3V
t
PLZ
t
PZL
t
PZH
t
PHZ
3.5V
0V
1.5V
1.5V
ENABLE
DISABLE
HIGH-LOW-HIGH
PULSE
LOW-HIGH-LOW
PULSE
t
W
1.5V
1.5V
t
NOTES
2581 drw 04
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
1.0 MHz; Z
O
50
; t
F
2.5ns;
t
R
2.5ns.
SWITCH POSITION
Test
Switch
Open Drain
Disable Low
Closed
Enable Low
All Other Test
Open
DEFINITIONS:
2581 tbl 08
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
7.3
6
IDT54/74FCT138/A/C
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
Plastic DIP
CERDIP
Small Outline IC
CERPACK
Leadless Chip Carrier
P
D
SO
E
L
Temperature
Range
X
Device
Type
X
Package
X
Process
Blank
B
Commercial
MIL-STD-883, Class B
XX
IDT
FCT
138
138A
138C
1-of-8 Decoder
Fast 1-of-8 Decoder
Super Fast 1-of-8 Decoder
54
74
55
C to +125
C
0
C to +70
C
2581 drw 03
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