NSC CGS74LCT2524

CGS74LCT2524
1 to 4 Minimum Skew (300 ps) 3V Clock Driver
General Description
Features
This minimum skew clock driver is a 3V option of the current
CGS74CT2524 Minimum Skew Clock Driver and is designed
for Clock Generation and Support (CGS) applications operating at low voltage, high frequencies. This device guarantees minimum output skew across the outputs of a given
device.
n Ideal for low power/low noise high speed applications
n Guaranteed:
— 300 ps pin-to-pin skew (tOSHL and tOSLH)
n Implemented on National’s FACT™ family process
n 1 input to 4 outputs low skew clock distribution
n Symmetric output current drive: 12 mA IOH/IOL
n Industrial temperature of −40˚C to +85˚C
n 8-pin SOIC package
n Low dynamic power consumption above 20 MHz
n Guaranteed 2 kV ESD protection
Skew parameters are also provided as a means to measure
duty cycle requirements as those found in high speed clocking systems. This minimum skew clock driver with one input
driving four outputs, is specifically designed for signal generation and clock distribution applications.
Logic Symbol
Connection Diagrams
Pin Assignment
SOIC (MO)
01195601
The output pins act as a single entity and will follow the state of the CLK
when the clock distribution chip is selected.
01195602
Pin Description
Pin Names
Description
CLK
Clock Input
O0–O3
Outputs
Truth Table
Inputs
Outputs
CLK
O0–O3
01195603
L
L
H
H
See NS Package Number M08A
L = Low Logic Level
H = High Logic Level
FACT™ is a trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS011956
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CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver
November 2003
CGS74LCT2524
Absolute Maximum Ratings
Junction Temperature (θJA)
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
Airflow
−0.5V to 7.0V
Recommended Operating
Conditions
−20 mA
V = VCC + 0.5V
+20 mA
DC Input Voltage (VI)
Supply Voltage (VCC)
−0.5V to VCC
+0.5V
DC Output Diode Current (IO)
3.0V to 3.6V
Input Voltage (VIN)
0V to VCC
Output Voltage (VO)
0V to VCC
Operating Temperature (TA)
V = −0.5V
−20 mA
Industrial
V = VCC + 0.5V
+20 mA
Commercial
DC Output Voltage (VO)
−0.5V to VCC
+0.5V
DC Output Source or Sink Current
(IO)
0˚C to +70˚C
9.6 ns max
(0.8V to 2.0V)
Note 1: 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.
± 50 mA
± 50 mA
per Output Pin (ICC or IGND)
−40˚C to +85˚C
Input Rise and Fall Times
DC VCC or Ground Current
Storage Temperature (TSTG)
500 LFM
M 167 132 117 ˚C/W
DC Input Voltage Diode Current (IIK)
V = −0.5V
0 225
−65˚C to +150˚C
DC Electrical Characteristics
Over recommended operating conditions unless specified otherwise.
Symbol
VIH
Parameter
Minimum High Level
VCC
(V)
Conditions
CGS74LCT2524
TA = +25˚C
Typ
TA = −40˚C to +85˚C
Units
Guaranteed Limits
VOUT = 0.1V or VCC−0.1V
3.6
1.5
2.0
2.0
V
VOUT = 0.1V or VCC−0.1V
3.6
1.5
0.8
0.8
V
VIN = VIL or VIH, IOUT = −50 µA
3.0
2.9
2.9
V
Output Voltage
VIN = VIL or VIH, IOH = −12 mA
3.0
2.5
2.4
V
Minimum Low Level
VIN = VIL or VIH, IOUT = 50 µA
3.0
0.1
0.1
V
Output Voltage
VIN = VIL or VIH, IOL = −12 mA
3.0
0.3
0.4
V
Maximum Input
VIN = VCC, GND
3.6
± 0.1
± 1.0
µA
3.6
100
µA
Input Voltage
VIL
Maximum Low Level
Input Voltage
VOH
VOL
IIN
Minimum High Level
Leakage Current
ICCT
Maximum ICC/Input
VIN = 3.0V
IOLD
Minimum Dynamic
VOLD = 0.8V (max)
3.6
36
mA
IOHD
Output Current
VOHD = 2.0V (min)
3.6
−25
mA
Maximum Quiescent
VIN = VCC or GND
3.6
10
µA
ICC
Supply Current
www.national.com
2
2.5
Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC = 3.3V, TA = 25˚C
LCT2524
VCC = 3.0V to 3.6V
Symbol
TA = −40˚C to +85˚C
Parameter
Units
CL = 50 pF
RL = 500Ω
Min
tPLH
Low-to-High Propagation Delay
Typ
Max
6
15.0
ns
6
15.0
ns
CLK to On
tPHL
High-to-Low Propagation Delay
CLK to On
Extended AC Electrical Characteristics
Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC = 3.3V, TA = 25˚C
LCT2524
VCC = 3.0V to 3.6V
Symbol
TA = −40˚C to +85˚C
Parameter
Units
CL = 50 pF
RL = 500Ω
Min
fmax
Maximum Operating Frequency
tOSHL
Maximum Skew Common Edge
Typ
Max
75
MHz
300
ps
300
ps
2.5
ns
2.5
ns
Output-to-Output Variation (Note 2)
tOSLH
Maximum Skew Common Edge
Output-to-Output Variation (Note 2)
tPS
Maximum Skew
Pin (Signal) Transition Variation (Note 3)
tRISE
Rise Time/Fall Time
tFALL
(from 0.8V to 2.0V/2.0V to 0.8V)
THIGH
Time High
4
ns
TLOW
Time Low
4
ns
Note 2: Output-to-Output Skew is defined as the absolute value of the difference between the actual propagation delay for 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). Limits are characterized and guaranteed by design @ 66 MHz.
Note 3: Pin transition skew is the absolute difference between HIGH-to-LOW and LOW-to-HIGH propagation delay, measured at a given output pin.
Note 4: Refer to Minimum Skew Parameters Measurement Information Chart for definitions of each skew specification.
Note 5: Load capacitance includes the test jig.
Timing Diagrams
01195605
3
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CGS74LCT2524
AC Electrical Characteristics
CGS74LCT2524
Timing Diagrams
(Continued)
01195606
01195604
Test Circuit
01195607
RL is 500Ω
CL is 50 pF for all propagation delays and skew measurements.
Ordering Information
(Contact NSC Mar-
keting for specific date of availability)
01195608
www.national.com
4
CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver
Physical Dimensions
inches (millimeters)
unless otherwise noted
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC
Order Number CGS74LCT2524M
NS Package Number M08A
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