PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
1
PS2041A 03/11/96
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Logic Block Diagram
PI74FCT16827T
PI74FCT162827T
PI74FCT162H827T
Fast CMOS
20-Bit Buffers
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 PI74FCT16827T, PI74FCT162827T, and PI74FCT162H827T are
20-bit wide bus drivers designed to provide buffering and high-
performance bus interfacing for wide data/address paths or buses
with parity. Two pair of nanded output enable controls allow the
devices to be operated as two 10-bit buffers or as one 20-bit buffer.
Signal pins are arranged in a flow-through organization for ease of
layout and hysteresis is designed into all inputs to improve noise
margin.
The PI74FCT16827T output buffers are designed with a Power-Off
disable function allowing "live insertion" of boards when the
devices are used as backplane drives.
The PI74FCT162827T 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 PI74FCT162H827T 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.
Product Features:
Common Features:
PI74FCT16827T, PI74FCT162827T, and PI74FCT2H827T
are high-speed,
low power devices with high current drive
V
CC
= 5V 10%
Hysteresis on all inputs
Packages available:
56-pin 240 mil wide plastic TSSOP (A)
56-pin 300 mil wide plastic SSOP (V)
PI74FCT16827T 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
= 25C
PI74FCT162827T Features:
Balanced output drivers: 24 mA
Reduced system switching noise
Typical V
OLP
(Output Ground Bounce) < 0.6V
at V
CC
= 5V, T
A
= 25C
PI74FCT162H827T Features:
Bus Hold retains last active bus state during 3-state
Eliminates the need for external pull-up resistors
1
OE
1
1
OE
2
1
A
1
1
Y
1
To 9 other channels
2
OE
1
2
OE
2
2
A
1
2
Y
1
To 9 other channels
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
2
PS2041A 03/11/96
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Pin Name
Description
xOEx
Output Enable Inputs (Active LOW)
xAx
(1)
Data Inputs
xYx
3-State Outputs
Note: 1. For the PI74FCT162H827T, these pins have "Bus
Hold." All other pins are standard, outputs, or I/Os.
Product Pin Description
Product Pin Configuration
Inputs
Outputs
xOE
1
xOE
2
xAx
xYx
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
Truth Table
(1)
1.
H = High Voltage Level
L = Low Voltage Level
X = Don't Care
Z = High Impedance
1
OE
1
1
1
Y
1
2
1
Y
2
3
GND
4
1
Y
3
5
1
Y
4
6
V
CC
7
1
Y
5
8
1
Y
6
9
1
Y
7
10
GND
11
1
Y
8
12
1
Y
9
13
1
Y
10
14
2
Y
1
15
2
Y
2
16
2
Y
3
17
GND
18
2
Y
4
19
2
Y
5
20
2
Y
6
21
V
CC
22
2
Y
7
23
2
Y
8
24
1
OE
2
56
1
A
1
55
1
A
2
54
GND
53
1
A
3
52
1
A
4
51
V
CC
50
1
A
5
49
1
A
6
48
1
A
7
47
GND
46
1
A
8
45
1
A
9
44
1
A
10
43
2
A
1
42
2
A
2
41
2
A
3
40
GND
39
2
A
4
38
2
A
5
37
2
A
6
36
V
CC
35
2
A
7
34
2
A
8
33
GND
25
2
Y
9
26
2
Y
10
27
2
OE
1
28
GND
32
2
A
9
31
2
A
10
30
2
OE
2
29
56-PIN
V56
A56
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
3
PS2041A 03/11/96
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5.0V 10%)
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.8
V
I
IH
Input HIGH Current
Standard Input, V
CC
= Max.
V
IN
= V
CC
1
A
I
IH
Input HIGH Current
Standard I/O, V
CC
= Max.
V
IN
= V
CC
1
A
I
IH
Input HIGH Current
Bus Hold Input
(4)
, V
CC
= Max.
V
IN
= V
CC
100
A
I
IH
Input HIGH Current
Bus Hold I/O
(4)
, V
CC
= Max.
V
IN
= V
CC
100
A
I
IL
Input LOW Current
Standard Input, V
CC
= Min.
V
IN
= GND
1
A
I
IL
Input LOW Current
Standard I/O, V
CC
= Min.
V
IN
= GND
1
A
I
IL
Input LOW Current
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= GND
100
A
I
IL
Input LOW Current
Bus Hold I/O
(4)
, V
CC
= Min.
V
IN
= GND
100
A
I
BHH
Bus Hold
Bus Hold Input
(4)
, V
CC
= Min.
V
IN
= 2.0V
50
A
I
BHL
Sustain Current
V
IN
= 0.8V
+50
I
OZH
(5)
High-Impedance
V
CC
= Max.
V
OUT
= 2.7V
1
A
I
OZL
(5)
Output Current
V
CC
= Max.
V
OUT
= 0.5V
1
A
(3-S
TATE
O
UTPUTS
)
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
0.7
1.2
V
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
OUT
= GND
80
140
200
mA
I
O
Output Drive Current
V
CC
= Max.
(3)
, V
OUT
= 2.5V
50
180
mA
V
H
Input Hysteresis
100
mV
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .................................................................... 65C to +150C
Ambient Temperature with Power Applied .................................... 40C to +85C
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.
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, +25C 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.
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
4
PS2041A 03/11/96
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PI74FCT16827T Output Drive Characteristics
(Over the Operating Range)
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 3.0 mA
2.5
3.5
V
I
OH
= 15.0 mA
2.4
3.5
I
OH
= 32.0 mA
2.0
3.0
V
OL
Output LOW Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 64 mA
0.2
0.55
V
I
OFF
Power Down Disable
V
CC
= 0V, V
IN
or V
OUT
4.5V
--
--
100
A
PI74FCT162827T/162H827T Output Drive Characteristics
(Over the Operating Range)
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 24.0 mA
2.4
3.3
V
V
OL
Output LOW Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 24 mA
0.3
0.55
V
I
ODL
Output LOW Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
60
115
150
mA
I
ODH
Output HIGH Current
V
CC
= 5V, V
IN
= V
IH
OR
V
IL
, V
OUT
= 1.5V
(3)
60
115
150
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, +25C 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.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
pF
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
5
PS2041A 03/11/96
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND
0.1
500
A
Supply Current
or V
CC
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
2.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
60
100
A/
Input per MHz
(4)
Outputs Open
V
IN
= GND
MHz
OE
1
= OE
2
= GND
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
0.6
1.5
(5)
mA
Current
(6)
Outputs Open
V
IN
= GND
f
CP
= 10 MH
Z
50% Duty Cycle
V
IN
= 3.4V
0.9
2.3
(5)
OE
1
= OE
2
= GND
V
IN
= GND
f
I
= 5 MH
Z
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
3.0
5.5
(5)
Outputs Open
V
IN
= GND
f
CP
= 10 MH
Z
50% Duty Cycle
V
IN
= 3.4
8.0
20.5
(5)
OE
1
= OE
2
= GND
V
IN
= GND
Eight Bits Toggling
f
I
= 2.5 MH
Z
50% Duty Cycle
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, +25C 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
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
I
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.
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
6
PS2041A 03/11/96
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16827AT
16827BT
16827CT
16827DT
16827ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
8.0
1.5
5.0
1.5
4.4
1.5
3.8
1.5
3.2
ns
t
PHL
X
A
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
15.0
1.5
13.0
1.5
10.0
1.5
7.5
1.5
7.0
ns
R
L
= 500
t
PZH
Output Enable Time
C
L
= 50 pF
1.5
12.0
1.5
8.0
1.5
7.0
1.5
5.0
1.5
4.8
ns
t
PZL
X
OE
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
23.0
1.5
15.0
1.5
14.0
1.5
9.0
1.5
9.0
ns
R
L
= 500
t
PHZ
Output Disable Time
(3)
C
L
= 5 pF
(3)
1.5
9.0
1.5
6.0
1.5
5.7
1.5
4.3
1.5
4.0
ns
t
PLZ
OE
N
to Y
N
R
L
= 500
C
L
= 50 pF
1.5
10.0
1.5
7.0
1.5
6.0
1.5
4.3
1.5
4.0
ns
R
L
= 500
t
SK
(
O
)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
PI74FCT16827T Switching Characteristics over Operating Range
162827AT
162827BT
162827CT
162827DT
162827ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
8.0
1.5
5.0
1.5
4.4
1.5
3.8
1.5
3.2
ns
t
PHL
X
A
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
15.0
1.5
13.0
1.5
10.0
1.5
7.5
1.5
7.0
ns
R
L
= 500
t
PZH
Output Enable Time
C
L
= 50 pF
1.5
12.0
1.5
8.0
1.5
7.0
1.5
5.0
1.5
4.8
ns
t
PZL
X
OE
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
23.0
1.5
15.0
1.5
14.0
1.5
9.0
1.5
9.0
ns
R
L
= 500
t
PHZ
Output Disable Time
(3)
C
L
= 5 pF
(3)
1.5
9.0
1.5
6.0
1.5
5.7
1.5
4.3
1.5
4.0
ns
t
PLZ
OE
N
to Y
N
R
L
= 500
C
L
= 50 pF
1.5
10.0
1.5
7.0
1.5
6.0
1.5
4.3
1.5
4.0
ns
R
L
= 500
t
SK
(
O
)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
PI74FCT162827T Switching Characteristics over Operating Range
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
PI74FCT16827T/162827/162H827T
20-BIT BUFFERS
7
PS2041A 03/11/96
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162H827AT
162H827BT
162H827CT
162H827DT
162H827ET
Com.
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
8.0
1.5
5.0
1.5
4.4
1.5
3.8
1.5
3.2
ns
t
PHL
X
A
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
15.0
1.5
13.0
1.5
10.0
1.5
7.5
1.5
7.0
ns
R
L
= 500
t
PZH
Output Enable Time
C
L
= 50 pF
1.5
12.0
1.5
8.0
1.5
7.0
1.5
5.0
1.5
4.8
ns
t
PZL
X
OE
X
to
X
Y
X
R
L
= 500
C
L
= 300 pF
(3)
1.5
23.0
1.5
15.0
1.5
14.0
1.5
9.0
1.5
9.0
ns
R
L
= 500
t
PHZ
Output Disable Time
(3)
C
L
= 5 pF
(3)
1.5
9.0
1.5
6.0
1.5
5.7
1.5
4.3
1.5
4.0
ns
t
PLZ
OE
N
to Y
N
R
L
= 500
C
L
= 50 pF
1.5
10.0
1.5
7.0
1.5
6.0
1.5
4.3
1.5
4.0
ns
R
L
= 500
t
SK
(
O
)
Output Skew
(4)
--
0.5
--
0.5
--
0.5
--
0.5
--
0.5
ns
PI74FCT162H827T Switching Characteristics over Operating Range
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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