CGS74LCT2524M [NSC]
1 to 4 Minimum Skew (300 ps) 3V Clock Driver; 1至4最小歪斜（ 300 PS ） 3V时钟驱动器
| 型号： | CGS74LCT2524M |
| 厂家： | 
National Semiconductor |
| 描述： | 1 to 4 Minimum Skew (300 ps) 3V Clock Driver |
| 文件： | 总5页 (文件大小：91K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2003
CGS74LCT2524
1 to 4 Minimum Skew (300 ps) 3V Clock Driver
General Description
Features
n Ideal for low power/low noise high speed applications
n Guaranteed:
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 oper-
ating at low voltage, high frequencies. This device guaran-
tees minimum output skew across the outputs of a given
device.
— 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
Skew parameters are also provided as a means to measure
duty cycle requirements as those found in high speed clock-
ing systems. This minimum skew clock driver with one input
driving four outputs, is specifically designed for signal gen-
eration and clock distribution applications.
n Low dynamic power consumption above 20 MHz
n Guaranteed 2 kV ESD protection
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
Clock Input
Outputs
CLK
O0–O3
Truth Table
Inputs
CLK
L
Outputs
01195603
O0–O3
See NS Package Number M08A
L
H
H
L = Low Logic Level
H = High Logic Level
™
FACT is a trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS011956
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Junction Temperature (θJA
)
Airflow
0
225 500 LFM
M
167 132 117 ˚C/W
Supply Voltage (VCC
)
−0.5V to 7.0V
Recommended Operating
Conditions
DC Input Voltage Diode Current (IIK
V = −0.5V
)
−20 mA
+20 mA
V = VCC + 0.5V
Supply Voltage (VCC
Input Voltage (VIN
Output Voltage (VO)
)
3.0V to 3.6V
0V to VCC
0V to VCC
DC Input Voltage (VI)
−0.5V to VCC
+0.5V
)
DC Output Diode Current (IO)
V = −0.5V
Operating Temperature (TA)
Industrial
−20 mA
+20 mA
−40˚C to +85˚C
0˚C to +70˚C
9.6 ns max
V = VCC + 0.5V
Commercial
DC Output Voltage (VO)
−0.5V to VCC
+0.5V
Input Rise and Fall Times
(0.8V to 2.0V)
DC Output Source or Sink Current
(IO)
Note 1: The Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed. The device should not be oper-
ated 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
DC VCC or Ground Current
per Output Pin (ICC or IGND
)
50 mA
Storage Temperature (TSTG
)
−65˚C to +150˚C
DC Electrical Characteristics
Over recommended operating conditions unless specified otherwise.
CGS74LCT2524
VCC
Symbol
VIH
Parameter
Conditions
TA = +25˚C
TA = −40˚C to +85˚C Units
Guaranteed Limits
(V)
Typ
Minimum High Level VOUT = 0.1V or VCC−0.1V
Input Voltage
3.6
1.5
1.5
2.0
0.8
2.0
V
VIL
Maximum Low Level VOUT = 0.1V or VCC−0.1V
Input Voltage
3.6
0.8
V
VOH
VOL
IIN
Minimum High Level VIN = VIL or VIH, IOUT = −50 µA
3.0
3.0
3.0
3.0
3.6
2.9
2.5
0.1
0.3
2.9
2.4
0.1
0.4
V
V
Output Voltage
VIN = VIL or VIH, IOH = −12 mA
Minimum Low Level VIN = VIL or VIH, IOUT = 50 µA
V
Output Voltage
VIN = VIL or VIH, IOL = −12 mA
VIN = VCC, GND
V
Maximum Input
Leakage Current
Maximum ICC/Input
Minimum Dynamic
Output Current
0.1
1.0
µA
ICCT
IOLD
IOHD
ICC
VIN = 3.0V
3.6
3.6
3.6
3.6
100
36
µA
mA
mA
µA
VOLD = 0.8V (max)
VOHD = 2.0V (min)
−25
10
Maximum Quiescent VIN = VCC or GND
Supply Current
2.5
www.national.com
2
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
TA = −40˚C to +85˚C
Symbol
Parameter
Units
CL = 50 pF
RL = 500Ω
Typ
Min
Max
tPLH
tPHL
Low-to-High Propagation Delay
CLK to On
6
15.0
ns
ns
High-to-Low Propagation Delay
CLK to On
6
15.0
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
TA = −40˚C to +85˚C
Symbol
Parameter
Units
CL = 50 pF
RL = 500Ω
Typ
Min
Max
300
300
2.5
fmax
Maximum Operating Frequency
Maximum Skew Common Edge
Output-to-Output Variation (Note 2)
Maximum Skew Common Edge
Output-to-Output Variation (Note 2)
Maximum Skew
75
MHz
ps
tOSHL
tOSLH
tPS
ps
ns
ns
Pin (Signal) Transition Variation (Note 3)
Rise Time/Fall Time
tRISE
tFALL
THIGH
TLOW
2.5
(from 0.8V to 2.0V/2.0V to 0.8V)
Time High
4
4
ns
ns
Time Low
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 (t ) or LOW-to-HIGH (t ) or in opposite directions both
OSHL
OSLH
@
). Limits are characterized and guaranteed by design 66 MHz.
HL and LH (t
OST
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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Timing Diagrams (Continued)
01195606
01195604
Test Circuit
01195607
R
C
is 500Ω
L
is 50 pF for all propagation delays and skew measurements.
L
Ordering Information (Contact NSC Mar-
keting for specific date of availability)
01195608
www.national.com
4
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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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
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safety or effectiveness.
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