NSC CGS74CT2524

CGS74CT2524
1 to 4 Minimum Skew (300 ps) Clock Driver
General Description
Features
These minimum skew clock drivers are designed for Clock
Generation and Support (CGS) applications operating at
high frequencies. This device guarantees minimum output
skew across the outputs of a given device.
Skew parameters are also provided as a means to measure
duty cycle requirements as those found in high speed clocking systems. The CGS74CT2524 is a minimum skew clock
driver with one input driving four outputs, specifically designed for signal generation and clock distribution applications.
Y
Logic Symbol
Connection Diagrams
Y
Y
Y
Y
Y
Y
Y
Guaranteed 300 ps pin-to-pin skew (tOSHL and tOSLH)
Implemented on National’s FACTTM family process
1 input to 4 outputs low skew clock distribution
Symmetric output current drive: 24 mA IOH/IOL
Industrial temperature of b40§ C to a 85§ C
8-pin SOIC package
Low dynamic power consumption above 20 MHz
Guaranteed 2 kV ESD protection
Pin Assignment
SOIC (M)
TL/F/11752– 1
TL/F/11752 – 2
The output pins act as a single entity and will follow the state of the CLK
when the clock distribution chip is selected.
Pin Description
Pin Names
Descripton
CLK
O0 – O3
Clock Input
Outputs
Truth Table
Inputs
Outputs
CLK
O0 – O3
L
H
L
H
TL/F/11752 – 3
L e Low Logic Level
H e High Logic Level
FACTTM is a trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation
TL/F/11752
RRD-B30M115/Printed in U. S. A.
CGS74CT2524 1 to 4 Minimum Skew (300 ps) Clock Driver
September 1995
Absolute Maximum Ratings (Note)
Recommended Operating
Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (VCC)
4.5V to 5.5V
0V to VCC
Input Voltage (VI)
Output Voltage (VO)
0 to VCC
b 40§ C to a 85§ C
Operating Temperature (TA)
Input Rise and Fall Times
(0.8V to 2.0V)
9.6 ns max
NOTE: The Absolute Maximum Ratings are those values
beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The
parametric values defined in the DC and AC Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions will
define the conditions for actual device operation.
b 0.5 to 7.0V
Supply Voltage (VCC)
DC Input Voltage Diode Current (IIK)
b 20 mA
V e b0.5V
a 20 mA
V e VCC a 0.5V
b 0.5V to (VCC a 0.5V)
DC Input Voltage (VI)
DC Output Diode (Current) (IO)
b 20 mA
V e b0.5V
a 20 mA
V e VCC a 0.5V
b 0.5V to (VCC a 0.5V)
DC Output Voltage (VO)
DC Output Source
g 50 mA
or Sink Current (IO)
DC VCC or Ground Current
g 50 mA
per Output Pin (ICC or IGND)
b 65§ C to a 150§ C
Storage Temperature (TSTG)
Junction Temperature (iJA)
0
225
500 LFM
M
167
132
117§ C/W
N
115
79
62 § C/W
DC Electrical Characteristics
Over recommended operating conditions unless specified otherwise.
CGS74CT2524
Symbol
Parameter
VCC
(V)
TA e a 25§ C
TA e b40§ C to a 85§ C
Typ
Units
Conditions
Guaranteed Limits
VIH
Minimum High Level
Input Voltage
4.5
5.5
1.5
1.5
2.0
2.0
2.0
2.0
V
VOUT e 0.1V
or VCC e b0.1V
VIL
Maximum Low Level
Input Voltage
4.5
5.5
1.5
1.5
0.8
0.8
0.8
0.8
V
VOUT e 0.1V
or VCC e b0.1V
VOH
Minimum High Level
Output Voltage
4.5
5.5
4.49
5.49
4.4
5.4
4.4
5.4
V
VIN e VIH
IOUT e b50 mA
3.86
4.86
3.76
4.76
V
VIN e VIH
IOH e b24 mA
0.1
0.1
0.1
0.1
V
VIN e VIL
IOUT e 50 mA
4.5
5.5
0.36
0.36
0.44
0.44
V
VIN e VIL
IOL e 24 mA
g 0.1
g 1.0
mA
VI e VCC, GND
VI e VCC b 2.1V
4.5
5.5
VOL
Minimum Low Level
Output Voltage
4.5
5.5
0.001
0.001
IIN
Maximum Input
Leakage Current
5.5
ICCT
Maximum ICC/Input
5.5
1.5
mA
IOLD
Minimum Dynamic
Output Current
5.5
75
mA
VOLD e 1.65V Max
5.5
b 75
mA
VOHD e 3.85V Min
80
mA
VIN e VCC
or GND
IOHD
ICC
Maximum Quiescent
Supply Current
5.5
0.6
8.0
2
AC Electrical Characteristics
Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC e 5V, TA e 25§ C.
CGS74CT2524
Symbol
VCC e 4.5V to 5.5V
TA e b40§ C to a 85§ C
CL e 50 pF
RL e 500X
Parameter
Min
Typ
Units
Max
tPLH
Low-to-High Propagation Delay
CLK to On
3.5
9.0
ns
tPHL
High-to-Low Propagation Delay
CLK to On
3.5
9.0
ns
Extended AC Electrical Characteristics
Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC e 5V, TA e 25§ C.
CGS74CT2524
Symbol
VCC e 4.5V to 5.5V
TA e b40§ C to a 85§ C
CL e 50 pF
RL e 500X
Parameter
Package
Min
Typ
Units
Max
Fmax
Maximum Operating Frequency
tOSHL
Maximum Skew Common Edge
Output-to-Output Variation (Note 1)
M
M (Note 2)
N
300
450
500
ps
Maximum Skew Common Edge
Output-to-Output Variation (Note 1)
M
M (Note 2)
N
300
450
500
ps
tOSLH
100
MHz
tPS
Maximum Skew Pin (Signal)
Transition Variation (Note 3)
1.0
ns
trise
tfall
Rise Time/Fall Time
(from 0.8V to 2.0V/2.0V to 0.8V)
1.5
ns
THigh
Time High
4
ns
TLow
Time Low
4
ns
Note 1: Output-to-Output Skew is defined as the absolute value of the difference between the actual propagation delay from any outputs within the same packaged
device. The specifications apply to any outputs switching in the same direction either HIGH to LOW (tOSHL) or LOW to HIGH (tOSLH) or in opposite directions both
HL and LH (tOST). tOSHL and tOSLH are characterized and guaranteed by design @ 1 MHz.
Note 2: Characterized at 66 MHz. Parameter guaranteed by design.
Note 3: Pin transition skew is the absolute difference between High-to-Low and Low-to-High propagation delay measure at a given output pin.
Note 4: Load capacitance includes the test jig.
3
Timing Diagrams
1 to 4 Min-Skew Clock Driver
TL/F/11752 – 4
TL/F/11752 – 5
TL/F/11752 – 13
Time high is measured with outputs above 2V.
Time low is measured with outputs below 0.8V.
Test Circuit
RL is 500X
CL is 50 pF for all prop delays and skew measurements.
TL/F/11752 – 6
4
Ordering Information
Contact NSC Marketing for specific data of availability
TL/F/11752 – 14
5
CGS74CT2524 1 to 4 Minimum Skew (300 ps) Clock Driver
Physical Dimensions inches (millimeters)
8 Lead (0.150× Wide) Molded Small Outline Package (M)
NS Package Number M08A
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