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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
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PI74FCT16240/162240/162H240T
PI74FCT16240T
16-BIT BUFFER/LINE DRIVERS
PI74FCT162240T
PI74FCT162H240T
Product Features:
Common Features:
• PI74FCT16240T, PI74FCT162240T, and PI74FCT162H240T
are high-speed,
low power devices with high current drive
• V
CC
= 5 V ±10%
• Hysteresis on all inputs
• Packages available:
– 48-pin 240 mil wide plastic TSSOP (A)
– 48-pin 300 mil wide plastic SSOP (V)
PI74FCT16240T Features:
• High output drive: I
OH
= –32 mA; I
OL
= 64 mA
• Power off disable outputs permit "live insertion"
• Typical V
OLP
(Output Ground Bounce) < 1.0V
at V
CC
= 5V, T
A
= 25°C
PI74FCT162240T Features:
• Balanced output drivers: ±24 mA
• Reduced system switching noise
• Typical V
OLP
(Output Ground Bounce) < 0.6V
at V
CC
= 5V, T
A
= 25°C
PI74FCT162H240T Features:
• Bus Hold retains last active bus state during 3-state
• Eliminates the need for external pull-up resistors
Fast CMOS 16-Bit
Buffer/Line Drivers
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are pro-
duced in the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT16240T, PI74FCT162240T, and PI74FCT162H240T
are 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 PI74FCT16240T output buffers are designed with a Power-
Off disable allowing “live insertion” of boards when used as
backplane drivers.
The PI74FCT162240T has ±24 mA 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.
The PI74FCT162H240T has “Bus Hold” which retains the input's
last state whenever the input goes to high-impedance preventing
“floating” inputs and eliminating the need for pull-up/down resistors.
Logic Block Diagram
1
OE
3
OE
1
A
0
1
Y
0
3
A
0
3
Y
0
1
A
1
1
Y
1
3
A
1
3
Y
1
1
A
2
1
Y
2
3
A
2
3
Y
2
1
A
3
1
Y
3
3
A
3
3
Y
3
2
OE
4
OE
2
A
0
2
Y
0
4
A
0
4
Y
0
2
A
1
2
Y
1
4
A
1
4
Y
1
2
A
2
2
Y
2
4
A
2
4
Y
2
2
A
3
2
Y
3
4
A
3
4
Y
3
1
PS2030A 03/11/96
Product Pin Description
Pin Name
X
OE
xAx
xYx
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
Inputs
(1)
3-State Outputs
Ground
Power
Product Pin Configuration
1
OE
1
Y
0
1
Y
1
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16240/162240/162H240T
16-BIT BUFFER/LINE DRIVERS
Truth Table
Inputs
(1)
X
OE
L
L
H
Note:
xAx
L
H
X
Outputs
(1)
xYx
H
L
Z
Note:
1. For the PI74FCT162H240T, these pins have “Bus Hold.”
All other pins are standard, outputs, or I/Os.
1. H = High Voltage Level
X = Don't Care
L = Low Voltage Level
Z = High Impedance
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
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
48-PIN
V48
A48
37
36
35
34
33
32
31
30
29
28
27
26
25
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
Y
3
3
OE
2
PS2030A 03/11/96
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PI74FCT16240/162240/162H240T
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 ..................................................................................... 120 mA
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
IH
I
IH
I
IL
I
IL
I
IL
I
IL
I
BHH
I
BHL
I
OZH
(5)
I
OZL
(5)
V
IK
I
OS
I
O
V
H
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input HIGH Current
Input HIGH Current
Input HIGH Current
Input LOW Current
Input LOW Current
Input LOW Current
Input LOW Current
Bus Hold
Sustain 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.
Bus Hold Input
(4)
, V
CC
= Max.
Bus Hold I/O
(4)
, V
CC
= Max.
Standard Input, V
CC
= Min.
Standard I/O, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
Bus Hold I/O
(4)
, V
CC
= Min.
Bus Hold Input
(4)
, V
CC
= Min.
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18 mA
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
= V
CC
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
IN
= GND
V
IN
= GND
V
IN
= 2.0V
V
IN
= 0.8V
V
OUT
= 2.7V
V
OUT
= 0.5V
0.8
1
1
±100
±100
–1
–1
±100
±100
–50
+50
1
–1
–1.2
–200
–180
Typ
(2)
Max.
Units
V
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
mA
mA
mV
–80
–50
–0.7
–140
100
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.
4. Pins with Bus Hold are identified in the pin description.
5. This specification does not apply to bi-directional functionalities with Bus Hold.
3
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PI74FCT16240/162240/162H240T
16-BIT BUFFER/LINE DRIVERS
PI74FCT16240T Output Drive Characteristics
(Over the Operating Range)
Parameters Description
V
OH
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= –3.0 mA
I
OH
= –15.0 mA
I
OH
= –32.0 mA
I
OL
= 64 mA
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
PI74FCT162240T/162H240T Output Drive Characteristics
(Over the Operating Range)
Parameters Description
V
OH
V
OL
I
ODL
I
ODH
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
= –24.0 mA
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 24 mA
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
–150
Units
V
V
mA
mA
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
4.5
5.5
Max.
6
8
Units
pF
pF
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.
4. This parameter is determined by device characterization but is not production tested.
4
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PI74FCT16240/162240/162H240T
16-BIT BUFFER/LINE DRIVERS
Power Supply Characteristics
Parameters Description
I
CC
∆I
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
= 3.4 V
(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
= 3.4 V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
0.9
2.4
2.3
(5)
4.5
(5)
V
IN
= 3.4 V
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 = 5.0 V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4 V); 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
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + fiNi)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4 V)
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)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
5
PS2030A 03/11/96
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