Function, pinout, and drive compatible with FCT and
F logic
•
FCT-C speed at 5.0 ns max. (Com’l),
FCT-A speed at 5.8 ns max. (Com’l)
•
Reduced V
OH
(typically = 3.3V) versions of equivalent
FCT functions
•
Edge-rate control circuitry for significantly improved
noise characteristics
•
Power-off disable feature
•
ESD > 2000V
•
Matched rise and fall times
•
Fully compatible with TTL input and output logic levels
•
Extended commercial range of
−40°C
to +85°C
• Sink current
64 mA (Com’l),
32 mA (Mil)
32 mA (Com’l),
12 mA (Mil)
•
Dual 1-of-8 decoder with enables
Source current
Functional Description
The FCT138T is a 1-of-8 decoder. The FCT138T 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 FCT138T features three enable inputs, two
active LOW (E
1
, E
2
) and one active HIGH (E
3
).
All inputs 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 FCT138T devices and one inverter.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Logic Block Diagram
E
1
E
2
E
3
A
2
A
1
A
0
Pin Configurations
LCC
Top View
E2
NC
E1
A2
E3
A
0
3
2
1
20
19
14 15 16 17 18
O3
NC
O2
O4
O1
A
1
A
0
NC
V
CC
O
0
A
1
A
2
E
1
E
2
E
3
O
7
GND
DIP/SOIC/QSOP
Top View
1
2
3
4
5
6
7
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
8
O
7
GND
NC
O
6
O
5
9
10
11
12
13
7 6 5 4
FCT138T–2
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
FCT138T–1
FCT138T–3
Pin Description
Name
A
E
1
−E
2
E
3
O
Address Inputs
Enable Inputs (Active LOW)
Enable Input (Active HIGH)
Outputs
Description
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
• CA 95134 •
408-943-2600
May 1994 – Revised March 17, 1997
CY54/74FCT138T
]
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
Outputs
O
3
H
H
H
H
H
H
L
H
H
H
H
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
Maximum Ratings
[2, 3]
(Above which the useful life may be impaired. For user
guidelines, not tested.)
Storage Temperature ................................. –65°C to +150°C
Ambient Temperature with
Power Applied............................................. –65°C to +135°C
Supply Voltage to Ground Potential ............... –0.5V to +7.0V
DC Input Voltage............................................ –0.5V to +7.0V
DC Output Voltage ......................................... –0.5V to +7.0V
DC Output Current (Maximum Sink Current/Pin)....... 120 mA
Power Dissipation.......................................................... 0.5W
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Operating Range
Range
Commercial
Military
[4]
Range
All
All
Ambient
Temperature
–40°C to +85°C
–55°C to +125°C
V
CC
5V
±
5%
5V
±
10%
Electrical Characteristics
Over the Operating Range
Parameter
V
OH
V
OH
V
OH
V
OL
V
IH
V
IL
V
H
V
IK
I
I
I
IH
I
IL
I
OS
I
OFF
Description
Output HIGH Voltage
Output HIGH Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Hysteresis
[6]
Input Clamp Diode Voltage
Input HIGH Current
Input HIGH Current
Input LOW Current
Output Short Circuit Current
[7]
Power-Off Disable
All inputs
V
CC
=Min., I
IN
=–18 mA
V
CC
=Max., V
IN
=V
CC
V
CC
=Max., V
IN
=2.7V
V
CC
=Max., V
IN
=0.5V
V
CC
=Max., V
OUT
=0.0V
V
CC
=0V, V
OUT
=4.5V
–60
–120
0.2
–0.7
–1.2
5
±1
±1
–225
±1
Test Conditions
V
CC
=Min., I
OH
=–32 mA
V
CC
=Min., I
OH
=–15 mA
V
CC
=Min., I
OH
=–12 mA
V
CC
=Min., I
OL
=64 mA
V
CC
=Min., I
OL
=32 mA
Com’l
Com’l
Mil
Com’l
Mil
2.0
0.8
Min.
2.0
2.4
2.4
3.3
3.3
0.3
0.3
0.55
0.55
Typ.
[5]
Max.
Unit
V
V
V
V
V
V
V
V
V
µA
µA
µA
mA
µA
Notes:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.
2. Unless otherwise noted, these limits are over the operating free-air temperature range.
3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V
CC
or ground.
4. T
A
is the “instant on” case temperature.
5. Typical values are at V
CC
=5.0V, T
A
=+25°C ambient.
6. This parameter is guaranteed but not tested.
7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I
OS
tests should be performed last.
2
CY54/74FCT138T
Capacitance
[6]
Parameter
C
IN
C
OUT
Input Capacitance
Output Capacitance
Description
Typ.
[5]
5
9
Max.
10
12
Unit
pF
pF
Power Supply Characteristics
Parameter
I
CC
∆I
CC
I
CCD
Description
Quiescent Power Supply Current
Quiescent Power Supply Current
(TTL inputs)
Dynamic Power Supply
Current
[9]
Total Power Supply Current
[10]
Test Conditions
V
CC
=Max., V
IN
<0.2V,
V
IN
>
V
CC
–0.2V
V
CC
=Max., V
IN
=3.4V,
[8]
f
1
=0, Outputs Open
V
CC
=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
V
IN
<
0.2V or V
IN
>
V
CC
–0.2V
V
CC
=Max., f
1
=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E
1
, E
2
, or E
3
, One Output Toggling
,
V
IN
<
0.2V or V
IN
>
V
CC
–0.2V
V
CC
=Max., f
1
=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E
1
, E
2
, or E
3
, One Output Toggling,
V
IN
=3.4V or V
IN
=GND
Notes:
8. Per TTL driven input (V
IN
=3.4V); all other inputs at V
CC
or GND.
9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
10. I
C
I
C
= I
CC
+∆I
CC
D
H
N
T
+I
CCD
(f
0
/2 + f
1
N
1
)
I
CC
= Quiescent Current with CMOS input levels
∆I
CC
= Power Supply Current for a TTL HIGH input (V
IN
=3.4V)
D
H
= Duty Cycle for TTL inputs HIGH
= Number of TTL inputs at D
H
N
T
I
CCD
= Dynamic Current caused by an input transition pair (HLH or LHL)
= Clock frequency for registered devices, otherwise zero
f
0
f
1
= Input signal frequency
= Number of inputs changing at f
1
N
1
All currents are in milliamps and all frequencies are in megahertz.
Typ.
[5]
0.1
0.5
0.06
Max.
0.2
2.0
0.12
Unit
mA
mA
mA/MHz
I
C
0.7
1.4
mA
1.0
2.4
mA
3
CY54/74FCT138T
Switching Characteristics
Over the Operating Range
FCT138T
Military
Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Description
Propagation Delay
A to O
Propagation Delay
E
1
or E
2
to O
Propagation Delay
E
3
to O
Min.
[11]
1.5
1.5
1.5
Max.
12.0
12.5
12.5
Commercial
Min.
[11]
1.5
1.5
1.5
Max.
9.0
9.0
9.0
Min.
[11]
1.5
1.5
1.5
FCT138AT
Military
Max.
7.8
8.0
8.0
Commercial
Min.
[11]
1.5
1.5
1.5
Max.
5.8
5.9
5.9
Unit
ns
ns
ns
Fig.
No.
[12]
1, 2
1, 5
1, 5
FCT138CT
Military
Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Description
Propagation Delay A to O
Propagation Delay E
1
or E
2
to O
Propagation Delay E
3
to O
Min.
[11]
1.5
1.5
1.5
Max.
6.0
6.1
6.1
Commercial
Min.
[11]
1.5
1.5
1.5
Max.
5.0
5.0
5.0
Unit
ns
ns
ns
Fig. No.
[12]
1, 2
1, 5
1, 5
Ordering Information
Speed
(ns)
5.0
5.8
Ordering Code
CY74FCT138CTQC
CY74FCT138CTSOC
CY74FCT138ATPC
CY74FCT138ATQC
CY74FCT138ATSOC
6.0
9.0
CY54FCT138CTDMB
CY54FCT138CTLMB
CY74FCT138TSOC
Package
Name
Q1
S1
P1
Q1
S1
D2
L61
S1
Package Type
16-Lead (150-Mil) QSOP
16-Lead (300-Mil) Molded SOIC
16-Lead (300-Mil) Molded DIP
16-Lead (150-Mil) QSOP
16-Lead (300-Mil) Molded SOIC
16-Lead (300-Mil) CerDIP
20-Pin Square Leadless Chip Carrier
16-Lead (300-Mil) Molded SOIC
Commercial
Military
Commercial
Operating
Range
Commercial
Notes:
11. Minimum limits are guaranteed but not tested on Propagation Delays.
12. See “Parameter Measurement Information” in the General Information Section.
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