1
PS2029B 10/27/98
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PI74FCT827/828T
(25
Series) P174FCT2827/2828T
10-BIT BUFFERS
Logic Block Diagram
NOTE: PI74FCT827 is shown.
Product Description
Pericom Semiconductor's PI74FCT series of logic circuits are
produced in the Company's advanced 0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25-ohm series resistor on
all outputs to reduce noise because of reflections, thus eliminating
the need for an external terminating resistor.
The PI74FCT827/828T and the PI74FCT2827/2828T are 10-bit
wide bus drivers providing high-performance bus interface
buffering for wide address/data paths or buses carrying parity. The
10-bit buffers have NAND-ed output enables for maximum control
flexibility. They are designed for high-capacitance load drive
capability, while providing low-capacitance bus loading at both
inputs and outputs. The PI74FCT827/2827T is a non-inverting of
the PI74FCT828/2828T.
Device models available upon request.
Product Features
PI74FCT827/828/2827/2828T are pin compatible with bipolar
FASTTM Series at a higher speed and lower power
consumption
25
series resistor on all outputs (FCT2XXX only)
TTL input and output levels
Low ground bounce outputs
Extremely low static power
Hysteresis on all inputs
Industrial operating temperature range: 40C to +85C
Packages available:
24-pin 300-mil wide plastic DIP (P)
24-pin 150-mil wide plastic QSOP (Q)
24-pin 150-mil wide plastic TQSOP (R)
24-pin 300-mil wide plastic SOIC (S)
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Fast CMOS
10-Bit Buffers
PI74FCT827T, PI74FCT828T
(25
Series) PI74FCT2827T
(25
Series) PI74FCT2828T
D
0
Y
0
D
1
Y
1
D
2
Y
2
D
3
Y
3
D
4
Y
4
D
5
Y
5
D
6
Y
6
D
7
Y
7
D
8
Y
8
D
9
Y
9
OE
1
OE
2
2
PS2029B 10/27/98
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PI74FCT827/828T
(25
Series) P174FCT2827/2828T
10-BIT BUFFERS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
OE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
GND
Vcc
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
OE2
Pin Name
Description
OE
N
Output Enable Input (Active LOW)
D0-D9
10-bit Data Inputs
Y0-Y9
10-bit Data Outputs
GND
Ground
V
CC
Power
Product Pin Description
Product Pin Configuration
Inputs
Outputs
Function
OE1
OE2
D
N
Y
N
Transparent
L
L
L
L
L
L
H
H
Three-State
H
X
X
Z
X
H
X
Z
Inputs
Outputs
Function
OE
1
OE
2
D
N
Y
N
Transparent
L
L
L
H
L
L
H
L
Three-State
H
X
X
Z
X
H
X
Z
1.
H = High Voltage Level
L = Low Voltage Level
X = Don't Care
Z = High Impedance
PI74FCT827/2827T
Truth Table (Non-Inverting)
(1)
PI74FCT828/2828T
Truth Table (Inverting)
(1)
24-PIN
P24
Q24
R24
S24
3
PS2029B 10/27/98
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PI74FCT827/828T
(25
Series) P174FCT2827/2828T
10-BIT BUFFERS
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 .................................................................................... 120mA
Power Dissipation ......................................................................................... 0.5W
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
= 40C to +85C, V
CC
= 5.0V 5%)
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
= 15.0mA
2.4
3.0
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 48mA
0.3
0.50
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 12mA (25
Series)
0.3
0.50
V
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
V
CC
= Max.
V
IN
= V
CC
1
A
I
IL
Input LOW Current
V
CC
= Max.
V
IN
= GND
1
A
I
OZH
High Impedance
V
CC
= M
AX
.
V
OUT
= 2.7V
1
A
I
OZL
Output Current
V
OUT
= 0.5V
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.2
V
I
OFF
Power Down Disable
V
CC
= GND, V
OUT
= 4.5V
--
--
100
A
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
OUT
= GND
60
120
mA
V
H
Input Hysteresis
200
mV
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output Capacitance
V
OUT
= 0V
8
12
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, +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.
4
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PI74FCT827/828T
(25
Series) P174FCT2827/2828T
10-BIT BUFFERS
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
2.0
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
0.15
0.25
mA/
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
1.5
3.5
(5)
mA
Current
(6)
Outputs Open
V
IN
= GND
f
CP
= 10 MH
Z
50% Duty Cycle
V
IN
= 3.4V
1.8
4.5
(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
6.0
(5)
Outputs Open
V
IN
= GND
f
CP
= 10 MH
Z
50% Duty Cycle
V
IN
= 3.4V
5.0
14.0
(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.
5
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PI74FCT827/828T
(25
Series) P174FCT2827/2828T
10-BIT BUFFERS
827AT/2827AT
827BT/2827BT 827CT/2827CT
827DT
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
6.5
1.5
5.0
1.5
4.4
1.5
3.8
t
PHL
D
N
to Y
N
R
L
= 500
C
L
= 300pF
(3)
1.5
15.0
1.5
13.0
1.5
10.0
1.5
7.5
R
L
= 500
t
PZH
Output Enable Time
C
L
= 50pF
1.5
9.5
1.5
8.0
1.5
7.0
1.5
5.0
ns
t
PZL
OE
N
to Y
N
R
L
= 500
C
L
= 300pF
(3)
1.5
23.0
1.5
15.0
1.5
14.0
1.5
9.0
R
L
= 500
t
PHZ
Output Disable Time
(3)
C
L
= 5pF
(3)
1.5
8.5
1.5
6.0
1.5
5.7
1.5
4.3
t
PLZ
OE
N
to Y
N
R
L
= 500
C
L
= 50pF
1.5
10.0
1.5
7.0
1.5
6.0
1.5
4.3
R
L
= 500
828AT/2828AT
828BT/2828BT
828CT
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Min.
Max.
Min.
Max.
Units
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
6.5
1.5
5.5
1.5
4.4
ns
t
PHL
D
N
to Y
N
R
L
= 500
C
L
= 300 pF
(3)
1.5
15.0
1.5
13.0
1.5
10.0
ns
R
L
= 500
t
PZH
Output Enable Time
C
L
= 50 pF
1.5
9.5
1.5
8.0
1.5
7.0
ns
t
PZL
OE
N
to Y
N
R
L
= 500
C
L
= 300 pF
(3)
1.5
23.0
1.5
15.0
1.5
14.0
ns
R
L
= 500
t
PHZ
Output Disable Time
(3)
C
L
= 5 pF
(3)
1.5
8.5
1.5
6.0
1.5
5.7
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
ns
R
L
= 500
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
PI74FCT828/2828T (inverting) Switching Characteristics over Operating Range
PI74FCT827/2827T (non-inverting) Switching Characteristics over Operating Range
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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