ETC CGS74LCT2524MX

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.
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.
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
Logic Symbol
Connection Diagrams
Pin Assignment
SOIC (MO)
DS011956-1
The output pins act as a single entity and will follow the state of the CLK
when the clock distribution chip is selected.
DS011956-2
Pin Description
Pin Names
Description
CLK
Clock Input
O0–O3
Outputs
Truth Table
Inputs
Outputs
CLK
O0–O3
L
L
H
H
DS011956-3
See NS Package Number M08A
L = Low Logic Level
H = High Logic Level
FACT™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS011956
www.national.com
CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver
January 2000
CGS74LCT2524
Absolute Maximum Ratings (Note 1)
Junction Temperature (θJA)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Input Voltage Diode Current (IIK)
V = −0.5V
V = VCC + 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IO)
V = −0.5V
V = VCC + 0.5V
DC Output Voltage (VO)
DC Output Source or Sink Current
(IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
Airflow
M
0
167
225
132
500 LFM
117 ˚C/W
Recommended Operating
Conditions
−0.5V to 7.0V
−20 mA
+20 mA
−0.5V to VCC +0.5V
Supply Voltage (VCC)
Input Voltage (VIN)
Output Voltage (VO)
Operating Temperature (TA)
Industrial
Commercial
Input Rise and Fall Times
(0.8V to 2.0V)
−20 mA
+20 mA
−0.5V to VCC +0.5V
± 50 mA
3.0V to 3.6V
0V to VCC
0V to VCC
−40˚C to +85˚C
0˚C to +70˚C
9.6 ns max
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
−65˚C to +150˚C
DC Electrical Characteristics
Over recommended operating conditions unless specified otherwise.
Symbol
Parameter
VCC
(V)
Conditions
CGS74LCT2524
TA = −40˚C to
TA = +25˚C
+85˚C
Typ
VOUT = 0.1V or VCC = −0.1V
VIH
Minimum High
Level
VIL
Maximum Low
Level
VOH
Minimum High
Level
VIN = VIL or VIH, IOUT = −50 µA
Output Voltage
VIN = VIL or VIH, IOH = −12 mA
VIN = VIL or VIH, IOUT = 50 µA
VIN = VIL or VIH, IOL = −12 mA
VIN = VCC, GND
Units
Guaranteed Limits
3.3
1.5
2.0
2.0
V
3.3
1.5
0.8
0.8
V
3.3
2.9
2.9
V
3.3
2.5
2.4
V
3.3
0.1
0.1
V
3.3
0.3
0.4
V
3.6
± 0.1
± 1.0
µA
Input Voltage
VOUT = 0.1V or VCC = −0.1V
Input Voltage
VOL
Minimum Low Level
Output Voltage
IIN
Maximum Input
ICCT
Maximum ICC/Input
IOLD
Minimum Dynamic
IOHD
Output Current
ICC
Maximum
Quiescent
Leakage Current
VIN = 2.4V
VOLD = 0.8V (max)
VOHD = 2.0V (min)
VIN = VCC or GND
100
µA
3.6
36
mA
3.6
−25
mA
10
µA
3.6
Supply Current
www.national.com
3.6
2
2.5
CGS74LCT2524
AC Electrical Characteristics
Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC = 3.3V, TA =
25˚C
Symbol
LCT2524
VCC = 3.0V to 3.6V
TA = −40˚C to +85˚C
CL = 50 pF
Parameter
Units
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
Symbol
LCT2524
VCC = 3.0V to 3.6V
TA = −40˚C to +85˚C
CL = 50 pF
Parameter
Units
RL = 500Ω
Min
fmax
Maximum Operating Frequency
tOSHL
Maximum Skew Common Edge
Typ
Max
75
MHz
300
ps
300
ps
2.5
ns
1.75
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
DS011956-5
3
www.national.com
CGS74LCT2524
Timing Diagrams
(Continued)
DS011956-6
DS011956-4
Test Circuit
DS011956-7
RL is 500Ω
CL is 50 pF for all propagation delays and skew measurements.
Ordering Information
(Contact NSC Marketing for specific date of availability)
DS011956-8
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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