3.3V CMOS 20-BIT
BUFFERS
Integrated Device Technology, Inc.
IDT74FCT163827A/B/C
FEATURES:
• 0.5 MICRON CMOS Technology
•
Typical t
SK
(o) (Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
• Packages include 25 mil pitch SSOP, 19.6 mil pitch
TSSOP and 15.7 mil pitch TVSOP
• Extended commercial range of -40°C to +85°C
• V
CC
= 3.3V
±0.3V,
Normal Range or
V
CC
= 2.7 to 3.6V, Extended Range
• CMOS power levels (0.4µW typ. static)
• Rail-to-Rail output swing for increased noise margin
• Low Ground Bounce (0.3V typ.)
• Inputs (except I/O) can be driven by 3.3V or 5V
components
DESCRIPTION:
The FCT163827A/B/C 20-bit buffers are built using ad-
vanced dual metal CMOS technology. These 20-bit bus
drivers provide high-performance bus interface buffering for
wide data/address paths or busses carrying parity. Two pairs
of NAND-ed output enable controls offer maximum control
flexibility and are organized to operate the device as two 10-
bit buffers or one 20-bit buffer. Flow-through organization of
signal pins simplifies layout. All inputs are designed with
hysteresis for improved noise margin.
The FCT163827A/B/C have series current limiting resis-
tors. This offers low ground bounce, minimal undershoot, and
controlled output fall times–reducing the need for external
series terminating resistors.
The inputs of the FCT163827A/B/C can be driven from
either 3.3V or 5V devices. This feature allows the use of these
devices as translators in a mixed 3.3V/5V supply system.
FUNCTIONAL BLOCK DIAGRAM
1
OE
1
1
OE
2
2
OE
1
2
OE
2
1
A
1
1
Y
1
2
A
1
2
Y
1
TO 9 OTHER CHANNELS
3083 drw 01
TO 9 OTHER CHANNELS
3083 drw 02
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
©1996
Integrated Device Technology, Inc.
AUGUST 1996
8.9
DSC-3083/3
1
IDT74FCT163827A/B/C
FAST CMOS 20-BIT BUFFERS
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATIONS
PIN DESCRIPTION
Pin Names
x
OE
x
Description
Output Enable Inputs (Active LOW)
Data Inputs
3-State Outputs
3083 tbl 01
1
OE
1
1
Y
1
1
Y
2
1
2
3
4
5
6
7
8
9
10
11
12
13
56
55
54
53
52
51
50
49
48
47
46
45
44
1
OE
2
1
A
1
1
A
2
xAx
xYx
GND
1
Y
3
1
Y
4
GND
1
A
3
1
A
4
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
V
TERM(4)
T
STG
I
OUT
Description
Terminal Voltage with
Respect to GND
Terminal Voltage with
Respect to GND
Terminal Voltage with
Respect to GND
Storage Temperature
DC Output Current
Max.
–0.5 to +4.6
–0.5 to +7.0
–0.5 to
V
CC
+ 0.5
–65 to +150
–60 to +60
Unit
V
V
V
V
CC
1
Y
5
1
Y
6
1
Y
7
V
CC
1
A
5
1
A
6
1
A
7
°
C
mA
GND
1
Y
8
1
Y
9
1
Y
10
2
Y
1
2
Y
2
2
Y
3
GND
1
A
8
1
A
9
1
A
10
2
A
1
2
A
2
2
A
3
14 SO56-1 43
SO56-2
15 SO56-3 42
16
17
18
19
20
21
22
23
24
25
26
27
28
41
40
39
38
37
36
35
34
33
32
31
30
29
3083 lnk 03
NOTES:
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 ex-
tended periods may affect reliability.
2. Vcc terminals.
3. Input terminals.
4. Output and I/O terminals.
GND
2
Y
4
2
Y
5
2
Y
6
GND
2
A
4
2
A
5
2
A
6
FUNCTION TABLE
(1)
x
OE
1
L
L
H
X
Inputs
x
OE
2
L
L
X
H
xAx
L
H
X
X
Outputs
xYx
L
H
Z
Z
3083 tbl 02
V
CC
2
Y
7
2
Y
8
V
CC
2
A
7
2
A
8
GND
2
Y
9
2
Y
10
2
OE
1
GND
2
A
9
2
A
10
2
OE
2
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
SSOP/
TSSOP/TVSOP
TOP VIEW
3083 drw 03
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
Parameter
(1)
C
IN
Input
Capacitance
C
OUT
Output
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3.5
3.5
Max. Unit
6.0
pF
8.0
pF
NOTE:
1. This parameter is measured at characterization but not tested.
3083 lnk 04
8.9
2
IDT74FCT163827A/B/C
FAST CMOS 20-BIT BUFFERS
COMMERCIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
= –40°C to +85°C, V
CC
= 2.7V to 3.6V
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
V
OH
Parameter
Input HIGH Level (Input pins)
Input HIGH Level (I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
Input HIGH Current (I/O pins)
Input LOW Current (Input pins)
Input LOW Current (I/O pins)
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Output HIGH Voltage
V
CC
= Max.
V
CC
= Max.
V
I
= 5.5V
V
I
= V
CC
V
I
= GND
V
I
= GND
V
O
= V
CC
V
O
= GND
V
CC
= Min., I
IN
= –18mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 3.0V
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –0.1mA
I
OH
= –3mA
I
OH
= –8mA
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
V
CC
= 3.0V
I
OL
= 24mA
V
IN
= V
IH
or V
IL
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Min.
2.0
2.0
–0.5
—
—
—
—
—
—
—
–36
50
V
CC
–
0.2
2.4
2.4
(5)
—
—
—
—
–60
—
—
Typ.
(2)
—
—
—
Max.
5.5
V
CC
+0.5
0.8
Unit
V
V
—
—
—
—
—
—
–
0.7
±
1
±
1
±
1
±
1
±
1
±
1
–
1.2
µ
A
µ
A
V
mA
mA
V
–60
90
—
3.0
3.0
—
0.2
0.3
0.3
–
135
–110
200
—
—
—
0.2
0.4
0.55
0.50
–240
—
V
OL
Output LOW Voltage
V
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Short Circuit Current
(4)
Input Hysteresis
Quiescent Power Supply Current
mA
mV
150
0.1
V
CC
= Max.,
V
IN
= GND or V
CC
10
µ
A
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 Vcc = 3.3V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
–0.6V at rated current.
3083 lnk 05
8.9
3
IDT74FCT163827A/B/C
FAST CMOS 20-BIT BUFFERS
COMMERCIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
V
CC
= Max.
Test Conditions
(1)
V
IN
= V
CC
–0.6V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
—
—
Typ.
(2)
2.0
50
Max.
30
75
Unit
µA
µA/
MHz
V
CC
= Max.
Outputs Open
x
OE
1
= x
OE
2
= GND
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
x
OE
1
= x
OE
2
= GND
One Bit Toggling
V
CC
= Max.
Outputs Open
fi = 2.5MHz
50% Duty Cycle
x
OE
1
= x
OE
2
= GND
Twenty Bits Toggling
I
C
Total Power Supply Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
–0.6V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
–0.6V
V
IN
= GND
—
0.5
0.7
mA
—
0.5
0.8
—
2.5
3.7
(5)
—
2.5
4.1
(5)
NOTES:
1.
2.
3.
4.
5.
6.
For conditions shown as max. or min., use appropriate value specified under Electrical Characteristics for the applicable device type.
Typical values are at V
CC
= 3.3V, +25°C ambient.
Per TTL driven input; all other inputs at V
CC
or GND.
This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
N
CP
/2 + fiNi)
I
CC
= Quiescent Current (I
CCL,
I
CCH
and I
CCZ
)
∆I
CC
= Power Supply Current for a TTL High Input
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
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
N
CP
= Number of Clock Inputs at f
CP
f
i
= Input Frequency
N
i
= Number of Inputs at fi
3083 tbl 06
8.9
4
IDT74FCT163827A/B/C
FAST CMOS 20-BIT BUFFERS
COMMERCIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(4)
FCT163827A
FCT163827B
Min.
(2)
Max.
FCT163827C
Min.
(2)
Max.
Symbol
Parameter
t
PLH
Propagation Delay
xAx to xYx
t
PHL
t
PZH
t
PZL
Output Enable Time
x
OE
x to xYx
t
PHZ
t
PLZ
Output Disable Time
x
OE
x to xYx
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
C
L
= 300pF
(4)
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
C
L
= 300pF
(4)
R
L
= 500Ω
C
L
= 5pF
(4)
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
Min.
(2)
Max.
1.5
1.5
1.5
1.5
1.5
1.5
—
8.0
15.0
12.0
23.0
9.0
10.0
0.5
1.5
1.5
1.5
1.5
1.5
1.5
—
5.0
13.0
8.0
15.0
6.0
7.0
0.5
1.5
1.5
1.5
1.5
1.5
1.5
—
4.4
10.0
7.0
14.0
5.7
6.0
0.5
Unit
ns
ns
ns
t
SK
(o) Output Skew
(3)
ns
3083 tbl 07
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
4. Propagation Delays and Enable/Disable times are with V
CC
= 3.3V
±0.3V,
Normal Range. For V
CC
= 2.7V to 3.6V, Extended Range, all Propagation Delays
and Enable/Disable times should be degraded by 20%.
8.9
5
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