PI74FCT16244T
PI74FCT162244T
Fast CMOS 16-Bit Buffer/Line Drivers
Features
Common Features
•
High-speed, low-power devices with high-current drive
V
CC
= 5V ±10%
•
Hysteresis on all inputs
•
Device models available upon request
PI74FCT16244T Features
•
High output drive: I
OH
= –32mA; I
OL
= 64mA
•
Power off disable outputs permit "live insertion"
•
Typical V
OLP
(Output Ground Bounce)
< 1.0V at V
CC
= 5V, T
A
= 25°C
PI74FCT162244T Features
•
Balanced output drivers: ±24mA
•
Reduced system switching noise
•
Typical V
OLP
(Output Ground Bounce)
< 0.6V at V
CC
= 5V, T
A
= 25°C
•
Packaging (Pb-free & Green available):
– 48-pin 240-mil wide plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
– 48-pin 173-mil wide plastic TVSOP (K)
Description
Pericom Semiconductor’s PI74FCT16244T and PI74FCT162244T
are non-inverting 16-bit buffer/line drivers designed for
applications driving high capacitance loads and low impedance
backplanes. These high-speed, low power devices offer bus/
backplane interface capability and a flow-through organization
for ease of board layout. These devices are designed with three-
state controls to operate in a Quad-Nibble, Dual-Byte, or a single
16-bit word mode.
The PI74FCT16244T output buffers are designed with a Power-
Off disable allowing “live insertion” of boards when used as
backplane drivers.
The PI74FCT162244T has ±24mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control
the output edge rate resulting in lower ground bounce and
undershoot. This eliminates the need for external terminating
resistors for most interface applications.
Block Diagram
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PI74FCT16244T/162244T
16-Bit Buffer/Line Drivers
Product Pin Description
Pin Name
xOE
xAx
xYx
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
Inputs
(1)
3-State Outputs
Ground
Power
Truth Table
Inputs
(1)
X
OE
L
L
H
xAx
L
H
X
Outputs
(1)
xYx
L
H
Z
Note:
1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Z = High Impedance
Pin Configuration
1
OE
1
Y
0
1
Y
1
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
37
36
35
34
33
32
31
30
29
28
27
26
25
2
OE
1
A
0
1
A
1
GND
1
Y
2
1
Y
3
GND
1
A
2
1
A
3
V
CC
2
Y
0
2
Y
1
V
CC
2
A
0
2
A
1
GND
2
Y
2
2
Y
3
3
Y
0
3
Y
1
GND
2
A
2
2
A
3
3
A
0
3
A
1
GND
3
Y
2
3
Y
3
GND
3
A
2
3
A
3
V
CC
4
Y
0
4
Y
1
GND
4
Y
2
4
Y
3
4
OE
V
CC
4
A
0
4
A
1
GND
4
A
2
4
A
3
3
OE
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PI74FCT16244T/162244T
16-Bit Buffer/Line Drivers
Maximum Ratings
(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 ......................... –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) –0.5V to +7.0V
DC Input Voltage ................................................................ –0.5V to +7.0V
DC Output Current .......................................................................... 120mA
Power Dissipation ............................................................................... 1.0W
Note:
Stresses greater than those listed under 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.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5.0V ±10%)
Parameters Description
V
IH
V
IL
I
IH
I
IH
I
IL
I
IL
I
OZH
I
OZL
V
IK
I
OS
I
O
V
H
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input HIGH Current
Input LOW Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Short Circuit Current
Output Drive Current
Input Hysteresis
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Standard Input, V
CC
= Max.
Standard I/O, V
CC
= Max.
Standard Input , V
CC
= Min.
Standard I/O, V
CC
= Min.
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= Max.
(3)
, V
OUT
= GND
V
CC
= Max.
(3)
, V
OUT
= 2.5V
Min.
2.0
V
IN
= V
CC
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–80
–50
–0.7
–140
100
0.8
1
1
–1
–1
1
–1
–1.2
–320
–180
Typ.
(2)
Max.
Units
V
V
μA
μA
μA
μA
μA
μA
V
mA
mA
m
V
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
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PI74FCT16244T/162244T
16-Bit Buffer/Line Drivers
PI74FCT16244T Output Drive Characteristics
(Over the Operating Range)
Parameters
V
OH
Description
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –3.0mA
I
OH
= –15.0mA
I
OH
= –32.0mA
I
OL
= 64mA
Min.
2.5
2.4
2.0
Typ.
(2)
3.5
3.5
3.0
0.2
Max.
Units
V
V
OL
I
OFF
Output LOW Voltage
Power Down Disable
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= 0V, V
IN
or V
OUT
- 4.5V
0.55
±100
V
μA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient and maximum loading.
PI74FCT162244T Output Drive Characteristics
(Over the Operating Range)
Parameters
V
OH
V
OL
I
ODL
I
ODH
Description
Output HIGH Voltage
Output LOW Voltage
Output LOW Current
Output HIGH Current
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –24.0mA
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 24mA
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)
Min.
2.4
60
–60
Typ.
(2)
3.3
0.3
115
–115
Max.
0.55
150
–160
Units
V
V
mA
mA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
4.5
5.5
Max.
7.5
8
Units
pF
pF
Notes:
1. This parameter is determined by device characterization but is not production tested.
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PI74FCT16244T/162244T
16-Bit Buffer/Line Drivers
Power Supply Characteristics
Parameters Description
I
CC
ΔI
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
X
OE = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = GND
16 Bits Toggling
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
60
Max.
500
1.5
100
Units
μA
mA
μA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
0.6
1.5
(5)
mA
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
0.9
2.4
2.3
(5)
4.5
(5)
V
IN
= 3.4V
V
IN
= GND
6.4
16.5
(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
ΔI
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
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)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
07-0059
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02/26/07
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