FAST CMOS 16-BIT
BUFFER/LINE DRIVER
Integrated Device Technology, Inc.
IDT54/74FCT16244T/AT/CT/ET
IDT54/74FCT162244T/AT/CT/ET
IDT54/74FCT166244T/AT/CT
IDT54/74FCT162H244T/AT/CT/ET
FEATURES:
• Common features:
– 0.5 MICRON CMOS Technology
– High-speed, low-power CMOS replacement for
ABT functions
–
Typical t
SK
(o) (Output Skew) < 250ps
– Low input and output leakage
≤
1µA (max.)
– 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, 15.7 mil pitch TVSOP and 25 mil pitch Cerpack
– Extended commercial range of -40°C to +85°C
• Features for FCT16244T/AT/CT/ET:
– High drive outputs (-32mA I
OH
, 64mA I
OL
)
– Power off disable outputs permit “live insertion”
– Typical V
OLP
(Output Ground Bounce) < 1.0V at
V
CC
= 5V, T
A
= 25°C
• Features for FCT162244T/AT/CT/ET:
– Balanced Output Drivers:
±24mA
(commercial),
±16mA
(military)
– Reduced system switching noise
– Typical V
OLP
(Output Ground Bounce) < 0.6V at
V
CC
= 5V,T
A
= 25°C
• Features for FCT166244T/AT/CT:
– Light Drive Balanced Output:
±8mA
(commercial),
±6mA
(military)
– Minimal system switching noise
– Typical V
OLP
(Output Ground Bounce) < 0.25V at
V
CC
= 5V,T
A
= 25°C
• Features for FCT162H244T/AT/CT/ET:
– Bus-Hold retains last active bus state during 3-state
– Eliminates the need for external pull up resistors
DESCRIPTION:
The 16-Bit Buffer/Line Driver is for bus interface or signal buffering
applications requiring high speed and low power dissipation. These
devices have a flow through pin organization, and shrink packaging
to simplify board layout. All inputs are designed with hysteresis for
improved noise margin. The three-state controls allow independent
4-bit, 8-bit or combined 16-bit operation. These parts are plug in
replacements for 54/74ABT16244 where higher speed, lower noise
or lower power dissipation levels are desired.
The FCT16244T/AT/CT/ET are ideally suited for driving
high capacitance loads (>200pF) and low impedance
backplanes. These "high drive" buffers are designed with
power off disable capability to allow "live insertion" of boards
when used in a backplane interface.
The FCT162244T/AT/CT/ET have balanced output current
levels and current limiting resistors. These offer low ground
bounce, minimal undershoot, and controlled output fall times,
reducing the need for external series terminating resistors
while still providing very high speed operation for loads of less
than 200pF.
The FCT166244T/AT/CT are suited for very low noise,
point-to-point driving where there is a single receiver, or a very
light lumped load (<100pF). The buffers are designed to limit
the output current to levels which will avoid noise and ringing
on the signal lines without using external series terminating
resistors.
The FCT162H244T/AT/CT/ET have "Bus-Hold" which re-
tains the input's last state whenever the input goes to high
impedance. This prevents "floating" inputs and eliminates the
need for pull-up/down resistors.
FUNCTIONAL BLOCK DIAGRAM
1
OE
1
A
1
1
A
2
1
A
3
1
A
4
1
Y
1
1
Y
2
1
Y
3
1
Y
4
3
OE
3
A
1
3
A
2
3
Y
1
3
Y
2
3
A
3
3
A
4
4
OE
3
Y
3
3
Y
4
2
OE
2
A
1
2
A
2
2
A
3
2
A
4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2
Y
1
2
Y
2
2
Y
3
2
Y
4
2544 drw 01
4
A
1
4
A
2
4
A
3
4
A
4
4
Y
1
4
Y
2
4
Y
3
4
Y
4
2544 drw 02
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
Integrated Device Technology, Inc.
OCTOBER 1996
DSC-2544/9
5.2
15
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET,
166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
1
OE
1
Y
1
1
Y
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
SO48-1 37
SO48-2
SO48-3 36
35
34
33
32
31
30
29
28
27
26
25
2
OE
1
A
1
1
A
2
1
OE
1
Y
1
1
Y
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
E48-1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
2544 drw 04
2
OE
1
A
1
1
A
2
GND
1
Y
3
1
Y
4
GND
1
A
3
1
A
4
GND
1
Y
3
1
Y
4
GND
1
A
3
1
A
4
V
CC
2
Y
1
2
Y
2
V
CC
2
A
1
2
A
2
V
CC
2
Y
1
2
Y
2
V
CC
2
A
1
2
A
2
GND
2
Y
3
2
Y
4
3
Y
1
3
Y
2
GND
2
A
3
2
A
4
3
A
1
3
A
2
GND
2
Y
3
2
Y
4
3
Y
1
3
Y
2
GND
2
A
3
2
A
4
3
A
1
3
A
2
GND
3
Y
3
3
Y
4
GND
3
A
3
3
A
4
GND
3
Y
3
3
Y
4
GND
3
A
3
3
A
4
V
CC
4
Y
1
4
Y
2
V
CC
4
A
1
4
A
2
V
CC
4
Y
1
4
Y
2
V
CC
4
A
1
4
A
2
GND
4
Y
3
4
Y
4
4
OE
GND
4
A
3
4
A
4
3
OE
GND
4
Y
3
4
Y
4
4
OE
2544 drw 03
GND
4
A
3
4
A
4
3
OE
SSOP/
TSSOP/TVSOP
TOP VIEW
CERPACK
TOP VIEW
PIN DESCRIPTION
Pin Names
x
OE
xAx
xYx
Description
3–State Output Enable Inputs (Active LOW)
Data Inputs
(1)
3-State Outputs
2544 tbl 01
NOTE:
1. On FCT16xH these pins have “Bus-hold”. All other pins are standard
inputs, outputs or I/Os.
5.2
2
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET,
166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
V
TERM(2)
Terminal Voltage with Respect to –0.5 to +7.0
GND
(3)
Terminal Voltage with Respect to
V
TERM
–0.5 to
GND
V
CC
+0.5
T
STG
Storage Temperature
–65 to +150
I
OUT
DC Output Current
–60 to +120
Unit
V
V
°C
mA
FUNCTION TABLE
(1)
Inputs
x
OE
L
L
H
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
Z = High Impedance
xAx
L
H
X
Outputs
xYx
L
H
Z
2544 tbl 02
2544 lnk 03
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.
2. All device terminals except FCT162XXXT and FCT166XXXT output and
I/O terminals.
3. Output and I/O terminals for FCT162XXXT and FCT166XXXT.
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.
2544 lnk 04
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (STANDARD PARTS)
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
= –40°C to +85°C, V
CC
= 5.0V
±
10%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V
±
10%
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
V
IK
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current (Input pins)
(5)
Input HIGH Current (I/O pins)
(5)
Input LOW Current (Input pins)
(5)
Input LOW Current (I/O pins)
(5)
High Impedance Output Current
(3-State Output pins)
(5)
Clamp Diode Voltage
Short Circuit Current
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Min., I
IN
= –18mA
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
V
I
= GND
V
CC
= Max.
V
O
= 2.7V
V
O
= 0.5V
Min.
2.0
—
—
—
—
—
—
—
—
–80
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
–
0.7
–
140
Max.
—
Unit
V
V
µA
0.8
±1
±1
±1
±1
±1
±1
–
1.2
–
225
—
µA
V
mA
mV
µA
100
5
V
CC
= Max., V
IN
= GND or V
CC
500
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 = 5.0V, +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. Duration of the condition can not exceed one second.
5. The test limit for this parameter is
±
5µA at T
A
= –55°C.
2544 lnk 05
5.2
3
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET,
166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (BUS-HOLD)
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
= –40°C to +85°C, V
CC
= 5.0V
±
10%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V
±
10%
Symbol
V
IH
V
IL
I
I H
Parameter
Input HIGH Level
Input LOW Level
Input
HIGH
Current
(4)
I
I L
Input
LOW
Current
(4)
I
BHH
I
BHL
I
OZH
I
OZL
V
IK
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Bus Hold
Standard Input
(5)
Standard I/O
(5)
Bus-hold Input
Bus-hold I/O
Standard Input
(5)
Standard I/O
(5)
Bus-hold Input
Bus-hold I/O
Bus-hold Input
V
CC
= Min.
V
I
= 2.0V
V
I
= 0.8V
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
Min.
2.0
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
–
0.7
–
140
Max.
—
Unit
V
V
µA
0.8
±1
±1
±100
±100
±1
±1
±100
±100
—
—
±1
±1
–
1.2
–
225
—
V
I
= GND
—
—
—
—
–50
+50
—
—
—
–80
—
—
µA
Sustain
Current
(4)
High Impedance Output Current
(3-State Output pins)
(5,6)
Clamp Diode Voltage
Short Circuit Current
Input Hysteresis
Quiescent Power Supply Current
V
O
= 2.7V
V
O
= 0.5V
µA
V
mA
mV
µA
100
5
V
CC
= Max., V
IN
= GND or V
CC
500
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 = 5.0V, +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. Pins with Bus-hold are identified in the pin description.
5. The test limit for this parameter is
±
5µA at T
A
= –55°C.
6. Does not include Bus-hold I/O pins.
2544 lnk 06
5.2
4
IDT54/74FCT16244T/AT/CT/ET, 162244T/AT/CT/ET,
166244T/AT/CT, 162H244T/AT/CT/ET FAST CMOS 16-BIT BUFFER/LINE DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
OUTPUT DRIVE CHARACTERISTICS FOR FCT16244T
Symbol
I
O
V
OH
Parameter
Output Drive Current
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Max., V
O
= 2.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –3mA
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
I
OH
= –24mA MIL.
I
OH
= –32mA COM'L.
(4)
I
OL
= 48mA MIL.
I
OL
= 64mA COM'L.
≤
4.5V
Min.
–50
2.5
2.4
2.0
—
—
Typ.
(2)
—
Max.
–
180
—
—
—
0.55
±1
Unit
mA
V
V
V
V
µA
2544 lnk 07
3.5
3.5
3.0
0.2
—
V
OL
I
OFF
Output LOW Voltage
Input/Output Power Off Leakage
(5)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 0V, V
IN
or V
O
OUTPUT DRIVE CHARACTERISTICS FOR FCT162244T
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –16mA MIL.
I
OH
= –24mA COM'L.
I
OL
= 16mA MIL.
I
OL
= 24mA COM'L.
Min.
60
–60
2.4
—
Typ.
(2)
115
–115
3.3
0.3
Max.
200
–200
—
0.55
Unit
mA
mA
V
V
2544 lnk 08
OUPUT DRIVE CHARACTERISTICS FOR FCT166244T
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –6mA MIL.
I
OH
= –8mA COM'L.
I
OL
= 6mA MIL.
I
OL
= 8mA COM'L.
Min.
16
–16
2.4
—
Typ.
(2)
48
–48
3.3
0.3
Max.
96
–96
—
0.55
Unit
mA
mA
V
V
2544 lnk 09
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 = 5.0V, +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. Duration of the condition can not exceed one second.
5. The test limit for this parameter is
±
5µA at T
A
= –55°C.
5.2
5
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