IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FAST CMOS
1-OF-8 DECODER
WITH ENABLE
FEATURES:
−
−
−
−
−
−
−
−
−
Std., A and C speed grades
Low input and output leakage
≤
1µ A (max.)
CMOS power levels
True TTL input and output compatibility
•
V
OH
= 3.3V (typ.)
•
V
OL
= 0.3V (typ.)
High Drive outputs (-15mA I
OH
, 48mA I
OL
)
Meets or exceeds JEDEC standard 18 specifications
Military product compliant to MIL-STD-883, Class B and DESC
listed (dual marked)
Power off disable outputs permit “live insertion”
Available in the following packages:
•
Industrial: SOIC, QSOP
•
Military: CERDIP, LCC, CERPACK
IDT54/74FCT138T/AT/CT
DESCRIPTION:
The IDT54/74FCT138T is a 1-of-8 decoder built using an advanced
dual metal CMOS technology. The IDT54/74FCT138T accepts three
binary weighted inputs (A
0
, A
1
, A
2
) and, when enabled, provides eight
mutually exclusive active low outputs (O
0
-
O
7
). The IDT54/74FCT138T
features 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 IDT54/74FCT138T
devices and one inverter.
FUNCTIONAL BLOCK DIAGRAM
A
2
A
1
A
0
E
1
E
2
E
3
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
c
1999 Integrated Device Technology, Inc.
AUGUST 2000
DSC-2570/7
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
V
CC
20
1
A
1
A
0
A
0
A
1
A
2
E
1
E
2
E
3
O
7
GND
1
2
3
4
5
6
7
8
D16-1
SO16-1
SO16-7
SO16-8
16
15
14
13
12
11
10
9
V
CC
O
0
O
1
O
2
O
3
O
4
O
5
O
6
A
2
E
1
NC
E
2
E
3
4
5
6
7
8
3
2
19
18
17
O
0
INDEX
NC
O
1
O
2
NC
O
3
O
4
L20-2
16
15
14
9
10
11
12
13
O
7
O
6
CERDIP/ SOIC/ QSOP/ CERPACK
TOP VIEW
LCC
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
T
STG
I
OUT
Rating
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Max.
–0.5 to +7
–0.5 to V
CC
+0.5
–65 to +150
–60 to +120
Unit
V
V
°C
mA
8T-link
PIN DESCRIPTION
Pin Names
A
0
- A
2
E
1
,
E
2
E
3
O
0
-
O
7
Description
Address Inputs
Enable Inputs (Active LOW)
Enable Input (Active HIGH)
Outputs (Active LOW)
NOTES:
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 Vcc by +0.5V unless otherwise noted.
2. Inputs and Vcc terminals only.
3. Outputs and I/O terminals only.
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Unit
pF
pF
8T-link
NOTE:
1. This parameter is measured at characterization but not tested.
2
GND
NC
O
5
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FUNCTION TABLE
(1)
Inputs
E
1
H
X
X
L
L
L
L
L
L
L
L
E
2
X
H
X
L
L
L
L
L
L
L
L
E
3
X
X
L
H
H
H
H
H
H
H
H
A
0
X
X
X
L
H
L
H
L
H
L
H
A
1
X
X
X
L
L
H
H
L
L
H
H
A
2
X
X
X
L
L
L
L
H
H
H
H
O
0
H
H
H
L
H
H
H
H
H
H
H
O
1
H
H
H
H
L
H
H
H
H
H
H
O
2
H
H
H
H
H
L
H
H
H
H
H
O
3
H
H
H
H
H
H
L
H
H
H
H
Outputs
O
4
H
H
H
H
H
H
H
L
H
H
H
O
5
H
H
H
H
H
H
H
H
L
H
H
O
6
H
H
H
H
H
H
H
H
H
L
H
O
7
H
H
H
H
H
H
H
H
H
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= – 40°C to +85°C, V
CC
= 5.0V ± 5%; Military: T
A
= – 55°C to +125°C, V
CC
= 5.0V ± 10%
Symbol
V
IH
V
IL
I
IH
I
IL
I
I
V
IK
I
OS
V
OH
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
(4)
Input LOW Current
(4)
Input HIGH Current
(4)
Clamp Diode Voltage
Short Circuit Current
Output HIGH Voltage
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
CC
= Max.
V
CC
= Max., V
I
= V
CC
(Max.)
V
CC
= Min., I
N
= –18mA
V
CC
= Max.
(3)
, V
O
= GND
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –6mA MIL
I
OH
= –8mA IND
I
OH
= –12mA MIL
I
OH
= –15mA IND
I
OH
= –32mA MIL
I
OH
= –48mA IND
—
V
CC
= Max
V
IN
= GND or V
CC
NOTES:
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. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. The test limit for this parameter is ±5µA at T
A
= -55°C.
Min.
2
—
—
—
—
—
–60
2.4
2
—
—
—
Typ.
(2)
—
—
—
—
—
– 0.7
–120
3.3
3
0.3
200
0.01
Max.
—
0.8
±1
±1
±1
–1.2
–225
—
—
0.5
—
1
Unit
V
V
µA
µA
µA
V
mA
V
V
V
mV
mA
V
I
= 2.7V
V
I
= 0.5V
V
OL
V
H
I
CC
Output LOW Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Min.
V
IN
= V
IH
or V
IL
3
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
Toggle
E
1
,
E
2
, or E
3
50% Duty Cycle
fo = 10MHz
One Input and
One Output Toggling
Min.
—
—
Typ.
(2)
0.5
0.15
Max.
2
0.3
Unit
mA
mA/
MHz
V
IN
= V
CC
V
IN
= GND
I
C
Total Power Supply Current
(5)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
—
1.5
4
mA
—
1.8
5
NOTES:
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
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 Input Transition Pair (HLH or LHL)
f
o
= Output Frequency
N
o
= Number of Outputs at f
o
All currents are in milliamps and all frequencies are in megahertz.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT138T
Ind.
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay
A
N
to
O
N
Propagation Delay
E
1
or
E
2
to
O
N
Propagation Delay
E
3
to
O
N
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Mil.
FCT138AT
Ind.
Mil.
FCT138CT
Ind.
Mil.
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Unit
1.5
1.5
1.5
9
9
9
1.5
1.5
1.5
12
12.5
12.5
1.5
1.5
1.5
5.8
5.9
5.9
1.5
1.5
1.5
7.8
8
8
1.5
1.5
1.5
5.1
5.2
5.2
1.5
1.5
1.5
6
6.1
6.1
ns
ns
ns
NOTES:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
4
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
V
IN
Pulse
Generator
D.U.T.
50pF
R
T
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Open
8-link
7.0V
Switch
Closed
V
OUT
500
Ω
C
L
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
O ctal lin k
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
t
SU
TIM ING
INPUT
ASYNCHRONOUS C ONTROL
PRES ET
CLEAR
ETC.
SYNCHRO NOUS CONTRO L
PRES ET
CLEAR
CLOCK ENABLE
ETC.
t
REM
t
H
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
O ctal lin k
PULSE WIDTH
LO W -HIGH-LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
O ctal lin k
1.5V
1.5V
t
SU
t
H
PROPAGATION DELAY
SAM E PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE P HASE
INPUT TRANSITION
t
PH L
t
PH L
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
O ctal lin k
ENABLE AND DISABLE TIMES
ENAB LE
DISA BLE
3V
CO NTROL
INPUT
t
PZL
OUTPUT
NO RM A LLY
LO W
SW ITCH
CLOSE D
t
PZH
OUTPUT
NO RM A LLY
HIGH
SW ITCH
OPEN
3.5V
1.5V
0.3V
t
PHZ
0.3V
1.5V
0V
0V
O ctal lin k
1.5V
t
PLZ
0V
3.5V
V
OL
V
OH
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
5
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