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CY54FCT157T, CY74FCT157T
QUAD 2-INPUT MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCCS014B – MAY 1994 – REVISED NOVEMBER 2001
D
D
D
D
D
D
D
D
D
D
description
NC – No internal connection
The ’FCT157T devices are quad two-input multiplexers that select four bits of data from two sources under the
control of a common data-select (S) input. The output-enable (E) input is active low. When E is high, all of the
outputs (Y) are forced low, regardless of all other input conditions.
Moving data from two groups of registers to four common output buses is a common use of the ’FCT157T
devices. The state of S determines the particular register from which the data comes. It also can be used as
a function generator. These devices are useful for implementing highly irregular logic by generating any 4 of
the 16 different functions of 2 variables, with 1 variable common.
The ’FCT157T devices are logic implementations of a four-pole, two-position switch, where the position of the
switch is determined by the logic levels at S.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
2001, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
Y
b
GND
NC
Y
c
I
1c
Function, Pinout, and Drive Compatible
With FCT and F Logic
Reduced V
OH
(Typically = 3.3 V) Versions
of Equivalent FCT Functions
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
I
off
Supports Partial-Power-Down Mode
Operation
Matched Rise and Fall Times
Fully Compatible With TTL Input and
Output Logic Levels
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
CY54FCT157T
– 32-mA Output Sink Current
– 12-mA Output Source Current
CY74FCT157T
– 64-mA Output Sink Current
– 32-mA Output Source Current
3-State Outputs
CY74FCT157T . . . Q OR SO PACKAGE
(TOP VIEW)
S
I
0a
I
1a
Y
a
I
0b
I
1b
Y
b
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
E
I
0d
I
1d
Y
d
I
0c
I
1c
Y
c
CY54FCT157T . . . L PACKAGE
(TOP VIEW)
I
0a
S
NC
V
CC
E
I
1a
Y
a
NC
I
0b
I
1b
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
I
0d
I
1d
NC
Y
d
I
0c
1
CY54FCT157T, CY74FCT157T
QUAD 2-INPUT MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCCS014B – MAY 1994 – REVISED NOVEMBER 2001
PIN DESCRIPTION
NAME
S
E
I0
I1
Y
DESCRIPTION
Common select input
Enable inputs (active low)
Data inputs from source 0
Data inputs from source 1
Noninverted outputs
ORDERING INFORMATION
TA
PACKAGE†
QSOP – Q
SOIC – SO
–40°C to 85°C
40°C
QSOP – Q
SOIC – SO
–55°C to 125°C
LCC – L
Tape and reel
Tube
Tape and reel
Tape and reel
Tube
Tape and reel
Tube
SPEED
(ns)
4.3
4.3
4.3
5
5
5
5.8
ORDERABLE
PART NUMBER
CY74FCT157CTQCT
CY74FCT157CTSOC
CY74FCT157CTSOCT
CY74FCT157ATQCT
CY74FCT157ATSOC
CY74FCT157ATSOCT
CY54FCT157ATLMB
TOP-SIDE
MARKING
FT157-3
FCT157C
FT157-1
FCT157A
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
E
H
L
L
L
L
S
X
H
H
L
L
I0
X
X
X
L
H
I1
X
L
H
X
X
OUTPUT
Y
L
L
H
L
H
H = High logic level, L = Low logic level,
X = Don’t care
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
CY54FCT157T, CY74FCT157T
QUAD 2-INPUT MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCCS014B – MAY 1994 – REVISED NOVEMBER 2001
logic diagram (positive logic)
I0a
2
4
I1a
3
Ya
I0b
5
7
I1b
6
Yb
I0c
11
9
I1c
10
Yc
I0d
14
12
I1d
13
Yd
E
S
15
1
Pin numbers shown are for the Q and SO packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range to ground potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC output current (maximum sink current/pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Package thermal impedance,
θ
JA
(see Note 1): Q package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90°C/W
SO package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57°C/W
Ambient temperature range with power applied, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 135°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
CY54FCT157T, CY74FCT157T
QUAD 2-INPUT MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCCS014B – MAY 1994 – REVISED NOVEMBER 2001
recommended operating conditions (see Note 2)
CY54FCT157T
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
–55
4.5
2
0.8
–12
32
125
–40
NOM
5
MAX
5.5
CY74FCT157T
MIN
4.75
2
0.8
–32
64
85
NOM
5
MAX
5.25
UNIT
V
V
V
mA
mA
°C
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VCC = 4.5 V,
VCC = 4.75 V,
VCC = 4.5 V,
VOH
VCC = 4 75 V
4.75
VCC = 4.5 V,
VCC = 4.75 V,
All inputs
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 5.5 V,
VCC = 5.25 V,
VCC = 0 V,
VCC = 5.5 V,
VCC = 5.25 V,
VIN = VCC
VIN = VCC
VIN = 2.7 V
VIN = 2.7 V
VIN = 0.5 V
VIN = 0.5 V
VOUT = 2.7 V
VOUT = 2.7 V
VOUT = 0.5 V
VOUT = 0.5 V
VOUT = 0 V
VOUT = 0 V
VOUT = 4.5 V
VIN
≤
0.2 V,
VIN
≥
VCC – 0.2 V
VIN
≥
VCC – 0.2 V
–60
–120
TEST CONDITIONS
IIN = –18 mA
IIN = –18 mA
IOH = –12 mA
IOH = –32 mA
IOH = –15 mA
IOL = 32 mA
IOL = 64 mA
0.2
5
5
±1
±1
±1
±1
10
10
–10
–10
–225
–60
±1
0.1
0.2
0.1
0.5
2
mA
0.5
2
0.2
–120
–225
±1
2.4
CY54FCT157T
MIN TYP† MAX
–0.7
3.3
2
2.4
0.3
0.55
0.3
0.2
0.55
3.3
V
V
µA
µA
µA
µA
µA
mA
µA
mA
V
–1.2
–0.7
–1.2
CY74FCT157T
MIN TYP† MAX
UNIT
V
VOL
Vhys
II
IIH
IIL
IOZH
IOZL
IOS‡
Ioff
ICC
∆I
CC
VIN
≤
0.2 V,
VCC = 5.5 V, VIN = 3.4 V§, f1 = 0, Outputs open
VCC = 5.25 V, VIN = 3.4 V§, f1 = 0, Outputs open
† Typical values are at VCC = 5 V, TA = 25°C.
‡ 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 to minimize internal chip heating and more accurately reflect operational values. Otherwise, prolonged
shorting of a high output can raise the chip temperature well above normal and cause invalid readings in other parametric tests. In any sequence
of parameter tests, IOS tests should be performed last.
§ Per TTL-driven input (VIN = 3.4 V); all other inputs at VCC or GND
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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