IDT54FCT257T 반도체 회로 부품 판매점
FAST CMOS QUAD 2-INPUT MULTIPLEXER
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 Integrated Device Technology |
Integrated Device Technology, Inc.
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
IDT54/74FCT157T/AT/CT/DT
IDT54/74FCT257T/AT/CT/DT
IDT54/74FCT2257T/AT/CT
FEATURES:
• Common features:
– Low input and output leakage ≤1µA (max.)
– CMOS power levels
– True TTL input and output compatibility
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
– Meets or exceeds JEDEC standard 18 specifications
– Product available in Radiation Tolerant and Radiation
Enhanced versions
– Military product compliant to MIL-STD-883, Class B
and DESC listed (dual marked)
– Available in DIP, SOIC, SSOP, QSOP, CERPACK
and LCC packages
• Features for FCT157T/257T:
– Std., A, C and D speed grades
– High drive outputs (-15mA IOH, 48mA IOL)
• Features for FCT2257T:
– Std., A, and C speed grades
– Resistor outputs (-15mA IOH, 12mA IOL Com.)
(-12mA IOH, 12mA IOL Mil.)
– Reduced system switching noise
FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The FCT157T, FCT257T/FCT2257T are high-speed quad
2-input multiplexers built using an advanced dual metal CMOS
technology. Four bits of data from two sources can be
selected using the common select input. The four buffered
outputs present the selected data in the true (non-inverting)
form.
The FCT157T has a common, active-LOW, enable input.
When the enable input is not active, all four outputs are held
LOW. A common application of ‘FCT157T is to move data
from two different groups of registers to a common bus.
Another application is as a function generator. The ‘FCT157T
can generate any four of the 16 different functions of two
variables with one variable common.
The FCT257T/FCT2257T have a common Output Enable
(OE) input. When OE is HIGH, all outputs are switched to a
high-impedance state allowing the outputs to interface directly
with bus-oriented systems.
The FCT2257T has balanced output drive with current
limiting resistors. This offers low ground bounce, minimal
undershoot and controlled output fall times-reducing the need
for external series terminating resistors. FCT2xxxT parts are
plug-in replacements for FCTxxxT parts.
PIN CONFIGURATIONS
S
157 Only E
I1B –I1D
I0B –I0D
3 other multiplexers
Z B–Z D
S
I0A
I1A
ZA
I0B
I1B
ZB
GND
1 16
2 15
3
P16-1,
D16-1,
14
4 SO16-1, 13
5 SO16-7 12
6 & 11
7 E16-1 10
89
Vcc
E or OE*
I0C
I1C
ZC
I0D
I 1D
ZD
DIP/SOIC/QSOP/CERPACK
TOP VIEW
2537 drw 02
I1A
I0A
257 Only OE
ZA
2537 drw 01
INDEX
3 2 20 19
I1A 4
1 18 I0C
ZA 5 L20-2 17 I1C
NC 6
16 NC
I0B 7
15 ZC
I1B 8
14 I0D
9 10 11 12 13
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
LCC
TOP VIEW
* E for FCT157, OE for FCT257/FCT2257.
©1996 Integrated Device Technology, Inc.
6.6
2537 drw 03
JUNE 1996
2537/6
1
IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
Description
I0A–I0D
Source 0 Data Inputs
I1A–I1D
Source 1 Data Inputs
E Enable Input (Active LOW)–FCT157T
OE Output Enable (Active LOW)–FCT257T/2257T
S Select Input
ZA–ZD
Outputs
2537 tbl 01
FUNCTION TABLE(1)
Inputs
E/OE
S
I0
H XX
L HX
L HX
L LL
L LH
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
I1
X
L
H
X
X
Output ZN
157 257
LZ
LL
HH
LL
HH
2537 tbl 02
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
VTERM(2) Terminal Voltage
with Respect to
GND
VTERM(3) Terminal Voltage
with Respect to
GND
TA Operating
Temperature
TBIAS Temperature
Under Bias
TSTG Storage
Temperature
PT Power Dissipation
Commercial
–0.5 to +7.0
–0.5 to
VCC +0.5
0 to +70
–55 to +125
–55 to +125
0.5
Military
–0.5 to +7.0
–0.5 to
VCC +0.5
–55 to +125
–65 to +135
–65 to +150
0.5
Unit
V
V
°C
°C
°C
W
IOUT
DC Output
–60 to +120 –60 to +120 mA
Current
NOTES:
2537 lnk 03
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS 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. Input and VCC terminals only.
3. Outputs and I/O terminals only.
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input
VIN = 0V 6 10 pF
Capacitance
COUT Output
VOUT = 0V 8 12 pF
Capacitance
NOTE:
2537 lnk 04
1. This parameter is measured at characterization but not tested.
6.6 2
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IDT54FCT257T cmos
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