PI74FCT377T
OCTAL D FLIP-FLOP with CLOCK ENABLE
1
PS2017A 03/11/96
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Fast CMOS Octal D Flip-Flop
with Clock Enable
Product Description:
Pericom Semiconductor's PI74FCT series of logic circuits are pro-
duced in the Company's advanced 0.6/0.8 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT377T is an 8-bit wide octal designed with eight edge-
triggered D-type flip-flops with individual D inputs and O outputs.
When Clock Enable (CE) is LOW, the common buffered Clock
(CP) loads all flip-flops simultaneously. The register is fully edge-
triggered. D input state, one setup time before the LOW-to-HIGH
clock transition, is transferred to the corresponding flip-flop's O
output. The CE input must be stable only one setup time prior to
the LOW-to-HIGH transition for predictable operation.
Product Features:
The PI74FCT377T is pin compatible with bipolar FASTTM
Series at a higher speed and lower power
consumption
TTL input and output levels
Octal D flip-flops with Clock Enable
Extremely low static power
Hysteresis on all inputs
Industrial operating temperature range: 40C to +85C
Packages available:
20-pin 173 mil wide plastic TSSOP (L)
20-pin 300 mil wide plastic DIP (P)
20-pin 150 mil wide plastic QSOP (Q)
20-pin 150 mil wide plastic TQSOP (R)
20-pin 300 mil wide plastic SOIC (S)
Logic Block Diagram
Inputs
Outputs
Mode
CP
CE
D
N
O
N
Load "1"
l
h
H
Load "0"
l
l
L
Hold
h
X
NC
(Do Nothing)
H
H
X
NC
Truth Table
(1)
1. H = HIGH Voltage Level
h =
HIGH Voltage Level one setup time
prior to the LOW-to-HIGH Clock
Transition
L =
LOW Voltage Level
l =
LOW Voltage Level one setup time
prior to the LOW-to-HIGH Clock
Transition
X = Don't Care
NC = No Change
=
LOW-to-HIGH Clock Transition
Pin Name
Description
CE
Clock Enable (Active LOW)
CP
Clock Pulse Input
D
0
-D
7
Data Inputs
O
0
-O
7
Data Outputs
GND
Ground
V
CC
Power
Product Pin Description
Product Pin Configuration
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PI74FCT377T
D
0
O
0
CE
CP
D
Q
CP
D
1
O
1
D
Q
CP
D
2
O
2
D
Q
CP
D
3
O
3
D
Q
CP
D
4
O
4
D
Q
CP
D
5
O
5
D
Q
CP
D
6
O
6
D
Q
CP
D
7
O
7
D
Q
CP
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CE
O
0
D
0
D
1
O
1
O
2
D
2
D
3
O
3
GND
Vcc
O
7
D
7
D
6
O
6
O
5
D
5
D
4
O
4
CP
20-PIN
L20
P20
Q20
R20
S20
PI74FCT377T
OCTAL D FLIP-FLOP with CLOCK ENABLE
2
PS2017A 03/11/96
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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 .......................................................................................... 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
= 5V 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
= 15.0 mA
2.4
3.0
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 64 mA
0.3
0.55
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
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
60
120
mA
I
OFF
Power Down Disable
V
CC
= GND, V
OUT
= 4.5V
--
--
100
A
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.
PI74FCT377T
OCTAL D FLIP-FLOP with CLOCK ENABLE
3
PS2017A 03/11/96
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Switching Characteristics over Operating Range
377T
377AT
377CT
377DT
Com.
Com.
Com.
Com.
Parameters
Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
2.0
13.0
2.0
7.2
2.0
5.2
2.0
4.5
ns
t
PHL
CP to O
N
R
L
= 500
t
SU
Setup Time, HIGH or LOW
2.5
--
2.0
--
2.0
--
2.0
--
ns
Dn to CP
t
H
Hold Time, HIGH or LOW
2.0
--
1.5
--
1.5
--
1.5
--
ns
Dn to CP
t
SU
Setup Time HIGH or LOW
4.0
--
3.5
--
3.5
--
2.0
--
ns
CE to CP
t
H
Hold Time HIGH or LOW
1.5
--
1.5
--
1.5
--
1.5
--
ns
CE to CP
t
W
Clock Pulse Width
(3)
7.0
--
6.0
--
6.0
--
3.0
--
ns
HIGH or LOW
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter guaranteed but not production tested.
Notes:
1. For conditions shown as Max. or Min., 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.)
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., Outputs Open
V
IN
= V
CC
0.15
0.25
mA/
Input per MHz
(4)
CE = GND
V
IN
= GND
MHz
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max., Outputs Open
V
IN
= V
CC
1.57
3.5
(5)
mA
Current
(6)
f
CP
= 10 MH
Z
, 50% Duty Cycle
V
IN
= GND
CE = GND
V
IN
= 3.4V
50% Duty Cycle
V
IN
= GND
2.0
5.5
(5)
One Bit toggling at f
I
= 5 MH
Z
V
CC
= Max., Outputs Open
V
IN
= V
CC
3.8
7.3
(5)
f
CP
= 10 MH
Z
, 50% Duty Cycle
V
IN
= GND
CE = GND
V
IN
= 3.4V
Eight Bits toggling at f
I
= 2.5 MH
Z
V
IN
= GND
6.0
16.3
(5)
50% Duty Cycle
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