IDT74FCT38074
3.3V CMOS 1-TO-4 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS
1-TO-4 CLOCK DRIVER
IDT74FCT38074
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FEATURES:
DESCRIPTION:
Advanced CMOS Technology
Guaranteed low skew < 100ps (max.)
Very low duty cycle distortion< 250ps (max.)
High speed propagation delay< 3ns (max.)
Very low CMOS power levels
TTL compatible inputs and outputs
1:4 fanout
Maximum output rise and fall time < 1.5ns (max.)
Low input capacitance: 3pF typical
V
CC
= 3.3V ± 0.3V
Inputs can be driven from 3.3V or 5V components
Operating frequency up to 166MHz
Available in SOIC package
The FCT38074 is a 3.3V clock driver built using advanced CMOS
technology. This low skew clock driver offers 1:4 fanout. The large fanout from
a single input reduces loading on the preceding driver and provides an efficient
clock distribution network. Multiple power and grounds reduce noise. Typical
applications are clock and signal distribution.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATION
O
1
V
CC
V
CC
1
2
3
4
8
7
6
5
O
4
O
3
O
2
O
1
O
2
IN
IN
GND
O
3
O
4
SOIC
TOP VIEW
INDUSTRIAL TEMPERATURE RANGE
1
c
2004 Integrated Device Technology, Inc.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MAY 2010
DSC-6594/6
IDT74FCT38074
3.3V CMOS 1-TO-4 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
T
J
T
STG
Description
Input Power Supply Voltage
Input Voltage
Output Voltage
Junction Temperature
Storage Temperature
Max
–0.5 to +4.6
–0.5 to +5.5
–0.5 to V
CC
+0.5
150
–65 to +165
Unit
V
V
V
°C
°C
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3
—
Max.
4
6
Unit
pF
pF
NOTE:
1. This parameter is measured at characterization but not tested.
NOTE:
1. Stresses greater than those listed under ABSOLUTE 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.
PIN DESCRIPTION
Pin Names
IN
Ox
Input
Outputs
Description
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Input HIGH
Dynamic Power Supply Current
per Output
(3)
I
C
Total Power Supply Current
(4)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
fi = 133MHz
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
fi = 166MHz
NOTES:
1.
2.
3.
4.
For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
Typical values are at V
CC
= 3.3V, +25°C ambient.
This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
i
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
I
N
= V
CC
-0.6V)
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
i
= Input Frequency
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= V
CC
- 0.6V
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC –
0.6V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC –
0.6V
V
IN
= GND
Min.
—
—
—
Typ.
(2)
0.1
45
80
Max.
30
300
120
Unit
µA
µA
µA/MHz
80
80
—
—
110
110
110
110
mA
140
140
2
IDT74FCT38074
3.3V CMOS 1-TO-4 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified
Industrial: T
A
= -40°C to +85°C, V
CC
= 3.3V ± 0.3V
Symbol
V
IH
V
IL
I
IH
I
IL
V
IK
I
ODH
I
ODL
I
OS
V
OH
V
OL
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
Input LOW Current
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Short Circuit Current
Output HIGH Voltage
Output LOW Voltage
V
CC
= Max.
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3,4)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3,4)
V
CC
= Max., V
O
= GND
(3,4)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –12mA
I
OH
= –100µA
I
OL
= 12mA
I
OL
= 100µA
V
I
= 5.5V
V
I
= GND
Test Conditions
(1)
Min.
2
–0.5
—
—
—
–45
50
–60
2.4
(5)
V
CC
- 0.2
—
—
Typ.
(2)
—
—
—
—
–0.7
–75
92
–135
3
—
0.3
—
Max.
5.5
0.8
±1
±1
–1.2
–180
200
–240
—
—
0.5
0.2
V
V
mA
mA
mA
V
Unit
V
V
µA
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3, 25°C ambient.
3. This parameter is guaranteed but not tested.
4. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
5. V
OH
= V
CC
- 0.6V at rated current.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(3,4)
Symbol
t
PLH
t
PHL
t
R
t
F
t
SK(O)
t
SK(P)
t
SK(PP)
f
MAX
Output Rise Time (0.8V to 2V)
Output Fall Time (2V to 0.8V)
Same device output pin-to-pin skew
(5)
Pulse skew
(6)
Part to part skew
(7)
Input Frequency
Parameter
Propagation Delay
Conditions
(1,8)
C
L
= 15pF
f
≤
166MHz
—
—
—
—
—
—
1.5
1.5
100
250
550
166
ns
ns
ps
ps
ps
MHz
Min
.
(2)
0.5
Max
.
3
Unit
ns
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. t
PLH
, t
PHL
, t
SK
(
P
), and t
SK
(
O
) are production tested. All other parameters guaranteed but not production tested.
4. Propagation delay range indicated by Min. and Max. limit is due to V
CC
, operating temperature and process parameters. These propagation delay limits do not imply skew.
5. Skew measured between all outputs under identical transitions and load conditions.
6. Skew measured is difference between propagation delay times t
PHL
and t
PLH
of same output under identical load conditions.
7. Part to part skew for all outputs given identical transitions and load conditions at identical V
CC
levels and temperature.
8. Airflow of 1m/s is recommended for frequencies above 133MHz.
3
IDT74FCT38074
3.3V CMOS 1-TO-4 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS
TEST CONDITIONS
Symbol
C
L
R
L
R
T
t
R
/ t
F
V
CC
= 3.3V ±0.3V
15
33
Z
OUT
of pulse generator
1 (0V to 3V or 3V to 0V)
Unit
pF
Ω
Ω
ns
Pulse
Generator
R
T
V
IN
D.U.T.
R
L
15pF
C
L
V
OUT
V
CC
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
t
R
/ t
F
= Rise/Fall time of the input stimulus from the Pulse Generator.
C
L
= 15pF Circuit
TEST WAVEFORMS
3V
1.5V
INPUT
t
PLH
t
PHL
V
OH
2.0V
OUTPUT
t
R
t
F
0.8V
1.5V
V
OL
OUTPUT 2
t
PLH2
t
PHL2
OUTPUT 1
t
SK(o)
t
SK(o)
0V
INPUT
t
PLH1
3V
1.5V
0V
V
OH
1.5V
V
OL
V
OH
1.5V
V
OL
t
PHL1
t
SK(o)
= |t
PLH2 -
t
PLH1
|
or
|t
PHL2 -
t
PHL1
|
Propagation Delay
Output Skew - t
SK(O)
INPUT
t
PLH
t
PHL
3V
1.5V
0V
V
OH
1.5V
V
OL
INPUT
t
PLH1
t
PHL1
3V
1.5V
0V
V
OH
1.5V
V
OL
PACKAGE 1 OUTPUT
t
SK(PP)
t
SK(PP)
OUTPUT
t
SK(p)
= |t
PHL -
t
PLH
|
PACKAGE 2 OUTPUT
Pulse Skew - t
SK(P)
t
PLH2
t
PHL2
V
OH
1.5V
V
OL
t
SK(PP)
= |t
PLH2 -
t
PLH1
|
or
|t
PHL2 -
t
PHL1
|
Part-to-Part Skew - t
SK(PP)
Part-to-Part Skew is for the same package and speed grade.
4
IDT74FCT38074
3.3V CMOS 1-TO-4 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT74FCT
XXXX
Device Type
X
Package
X
Process
I
-40°C to +85°C (Industrial)
DC
DCG
Small Outline IC
SOIC - Green
38074
3.3V CMOS 1-to-4 Clock Driver
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
5
for Tech Support:
clockhelp@idt.com
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