Page 1
查询74C2525供应商
CGS74C2525#CGS74CT2525
CGS74C2526
1-to-8 Minimum Skew Clock Driver
CGS74CT2526
#
September 1995
CGS74C2525
1-to-8 Minimum Skew Clock Driver
#
CGS74CT2525
The CGS ’C/CT2525 is a minimum skew clock driver with
one input driving eight outputs specifically designed for signal generation and clock distribution applications. The ’2525
is designed to distribute a single clock to eight separate
receivers with low skew across all outputs during both the
t
and t
PLH
but contains a multiplexed clock input to allow for systems
with dual clock speeds or systems where a separate test
clock has been implemented.
transitions. The ’2526 is similar to the ’2525
PHL
Logic Symbols
’2525
TL/F/10684– 1
Features
Y
These CGS devices implement National’s FACT
family
Y
Ideal for signal generation and clock distribution
Y
Guaranteed pin to pin and part to part skew
Y
Multiplexed clock input (’2526)
Y
Guaranteed 2 kV minimum ESD protection
Y
Symmetric output current drive of 24 mA for IOL/I
Y
’CT has TTL-compatible inputs
Y
These products are identical to 74AC/ACT2525 and
2526
Y
Available as Mil/Aero versions
54AC/ACT2525
54AC/ACT2526
TM
Connection Diagrams
Pin Assignment
for DIP and SOIC
’2525
OH
#
CGS74C2526
#
CGS74CT2526
’2526
TL/F/10684– 2
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
TM
FACT
is a trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation RRD-B30M106/Printed in U. S. A.
TL/F/10684
TL/F/10684– 3
’2526
TL/F/10684– 4
http://www.national.com
Page 2
Functional Description
On the multiplexed clock device, the SEL pin is used to
determine which CLKn input will have an active effect on
the outputs of the circuit. When SEL
selected and when SEL
e
The non-selected CLKn input will not have any effect on the
logical output level of the circuit. The output pins act as a
single entity and will follow the state of the CLK or
CLK1/CLK0 pins when either the multiplexed (’2526) or the
straight (’2525) clock distribution chip is selected.
Pin Description
Pin Names Description
CLK Clock Input (’2525)
CLK0, CLK1 Clock Inputs (’2526)
O
0–O7
SEL Clock Select (’2526)
Outputs
e
1, the CLK1 input is
0, the CLK0 input is selected.
Truth Tables
’2525
Inputs Outputs
CLK O0–O
LL
HH
Inputs Outputs
CLK0 CLK1 SEL O0–O
LXL L
HXL H
XLH L
XHH H
e
L
Low Voltage Level
e
H
High Voltage Level
e
X
Immaterial
7
’2526
7
’2525
TL/F/10684– 7
’2526
TL/F/10684– 8
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Page 3
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
DC Input Diode Current (IIK)
eb
V
0.5V
I
e
V
V
I
CC
)
CC
a
0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
e
V
0.5V
O
e
V
a
V
CC
0.5V
O
DC Output Voltage (VO)
DC Output Source
or Sink Current (I
)
O
DC VCCor Ground Current
per Output Pin (I
Storage Temperature (T
Junction Temperature (i
Plastic (N) 14-Lead 102
CC
or I
GND
STG
JA
)
)
)
Plastic (M) 14-Lead 128
Plastic (N) 16-Lead 97
Plastic (M) 16-Lead 124
b
b
0.5V to (V
b
0.5V to (V
b
65§Ctoa150§C
0.5V toa7.0V
b
20 mA
a
0.2 mA
a
0.5V)
CC
b
20 mA
a
20 mA
a
0.5V)
CC
g
50 mA
g
50 MA
C/W
§
C/W
§
C/W
§
C/W
§
Recommended Operating
Conditions
Supply Voltage (VCC)
‘C’ 2.0V to 6.0V
‘CT’ 4.5V to 5.5V
Input Voltage (V
Output Voltage (VO) 0VtoV
Operating Temperature (TA)
CGS74C/CT
54AC/ACT
Input Rise and Fall Times Devices
(30% to 70% of V
V
CC
Input Rise and Fall Times Devices
(0.8V to 2.0V) 9.6 ns max
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recommend operation of CGS circuits outside databook specifications.
) 0VtoV
I
)
e
3.3V 10.5 ns max
CC
4.5V 14.4 ns max
5.5V 17.6 ns max
DC Electrical Characteristics for CGS74C and 54AC Family Devices
Over recommended operating conditions unless specified otherwise.
CGS74C 54AC CGS74C
Symbol Parameter
V
IH
V
IL
V
OH
Minimum High Level 3.0 1.5 2.1 2.1 2.1 V
Input Voltage 4.5 2.25 3.15 3.15 3.15 V or V
Maximum Low Level 3.0 1.5 0.9 0.9 0.9 V
Input Voltage 4.5 2.25 1.35 1.35 1.35 V or V
Minimum High Level 3.0 2.99 2.9 2.9 2.9 I
Output Voltage 4.5 4.49 4.4 4.4 4.4 V
(Note 2) 5.5 5.49 5.4 5.4 5.4
V
OL
Maximum Low Level 3.0 0.002 0.1 0.1 0.1 I
Output Voltage 4.5 0.001 0.1 0.1 0.1 V
(Note 2) 5.5 0.001 0.1 0.1 0.1
V
(V)
CC
ea
T
25§C
A
b
e
T
A
55§Ctoa125§Cb40§Ctoa85§C
Typ Guaranteed Limits
5.5 2.75 3.85 3.85 3.85
5.5 2.75 1.65 1.65 1.65
3.0 2.56 2.4 2.46
4.5 3.86 3.7 3.76 V I
5.5 4.86 4.7 4.76
3.0 0.36 0.40 0.44 12 mA
4.5 0.36 0.50 0.44 V
5.5 0.36 0.50 0.44 24 mA
e
T
A
Units Conditions
b
40§Ctoa85§C
b
55§Ctoa125§C
e
OUT
b
CC
e
OUT
b
CC
eb
OUT
e
V
VILor V
IN
b
b
OH
b
e
50 mA
OUT
e
V
VILor V
IN
I
OL
0.1V
0.1V
0.1V
0.1V
50 mA
12 mA
24 mA
24 mA
24 mA
CC
CC
IH
IH
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Page 4
DC Electrical Characteristics for CGS74C and 54AC Family Devices (Continued)
Over recommended operating conditions unless specified otherwise.
CGS74C 54AC CGS74C
Symbol Parameter
V
(V)
CC
ea
T
25§C
A
b
e
T
A
55§Ctoa125§Cb40§Ctoa85§C
e
T
A
Units Conditions
Typ Guaranteed Limits
I
IN
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current V
5.5
g
0.1
g
1.0
g
1.0 mA
(Note 3)
Minimum Dynamic 5.5 50 75 mA V
Output Current
(Note 4)
Maximum Quiescent
Supply Current
5.5
5.5 8.0 80.0 80.0
b
50
b
75 mA V
mA
(Note 3)
e
I
OLD
OHD
e
V
IN
or GND
VCC, GND
e
1.65V Max
e
3.85V Min
V
CC
DC Electrical Characteristics for CGS74CT and 54ACT Family Devices
Over recommended operating conditions unless specified otherwise.
CGS74CT 54ACT CGS74CT
Symbol Parameter
V
V
V
Minimum High Level 4.5 1.5 2.0 2.0 2.0
IH
Input Voltage 5.5 1.5 2.0 2.0 2.0 or V
Maximum Low Level 4.5 1.5 0.8 0.8 0.8
IL
Input Voltage 5.5 1.5 0.8 0.8 0.8 or V
Minimum High Level 4.5 4.49 4.4 4.4 4.4
OH
Output Voltage 5.5 5.49 5.4 5.4 5.4
(Note 2)
V
Maximum Low Level 4.5 0.001 0.1 0.1 0.1
OL
Output Voltage 5.5 0.001 0.1 0.1 0.1
(Note 2)
I
IN
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum ICC/Input 5.5 0.6 1.6 1.5 mA V
Minimum Dynamic 5.5 50 75 mA V
Output Current
(Note 4)
Maximum Quiescent
Supply Current
(Note 5)
V
(V)
CC
ea
T
25§C
A
b
e
T
A
55§Ctoa125§Cb40§Ctoa85§C
Typ Guaranteed Limits
4.5 3.86 3.70 3.76 V
5.5 4.86 4.70 4.76
4.5 0.36 0.50 0.44 V
5.5 0.36 0.50 0.44 24 mA
5.5
5.5
g
0.1
g
1.0
b
50
5.5 8.0 160.0 80.0 mA
e
T
A
Units Conditions
V
V
VI
VI
g
1.0 mAV
b
75 mA V
V
OUT
CC
V
OUT
CC
OUT
e
V
IN
I
OH
OUT
e
V
IN
I
OL
e
I
e
I
OLD
OHD
e
V
IN
or GND
e
0.1V
b
0.1V
e
0.1V
b
0.1V
eb
VILor V
e
50 mA
VILor V
VCC, GND
V
CC
e
1.65V Max
e
3.85V Min
V
CC
50 mA
b
24 mA
b
24 mA
24 mA
b
2.1V
IH
IH
http://www.national.com 4
Page 5
AC Electrical Characteristics Over recommended operating conditions unless specified otherwise.
V
CC
Symbol Parameter
Range
(V)
(Note 6)
t
, Propagation Delay 3.3 3.0 6.5 11.0 3.0 11.0 3.0 12.5
PLH
t
PHL
t
PLH,
t
PHL
t
PLH
t
PHL
t
OSHL
t
OSLH
t
OST
CLK to On(’2525) 5.0 3.2 5.0 7.8 2.5 8.2 2.9 8.1
Propagation Delay 3.3 3.0 7.0 13.0 3.0 14.0
CLKn to On(’2526) 5.0 3.6 5.5 7.8 3.3 8.6
, Propagation Delay 3.3 3.0 8.0 14.0 3.0 15.0
SEL to On(’2526) 5.0 4.0 6.5 8.5 3.5 9.5
Maximum Skew
Common Edge
Output-to-Output (Note 7)
Variation
Maximum Skew
Common Edge
Output-to-Output (Note 7)
Variation
3.3 0.3 1.5 600
5.0 0.2 1.0 500
3.3 0.3 1.5 600
5.0 0.2 1.0 500
Maximum Skew
Opposite Edge
Output-to-Output (Note 7)
5.0 0.4 1.0 1.0 ns
Variation
t
PV
Maximum Skew ’C2525
Part-to-Part ’CT2525 5.0 3.5 4.0 ns
Variation (Note 8) ’C2526
’CT2526 5.0 5.0 ns
t
, Maximum
rise
t
fall
t
rise
t
fall
Rise/Fall Time 5.0 3.0 4.0 3.75 ns
(20% to 80% V
CC
)
, Maximum
Rise/Fall Time 0.9 1.1 ns
(0.8V/2.0V and 2.0V/0.8V)
CGS74C 54AC CGS74C
eb
55§CT
T
ea
T
25§C
A
e
C
50 pF
L
A
a
125§Cto
to
e
C
50 pF C
L
eb
40§C
A
a
85§C Units
e
50 pF
L
Min Typ Max Min Max Min Typ Max
1.5
1.0
ns
ns
ns
ps
ps
AC Electrical Characteristics Over recommended operating conditions unless specified otherwise.
CGS74CT 54ACT CGS74CT
eb
55§CT
T
ea
T
25§C
A
e
C
50 pF
L
A
a
125§Cto
to
e
C
50 pF C
L
eb
40§C
A
a
85§C Units
e
50 pF
L
Min Typ Max Min Max Min Max
http://www.national.com5
Symbol Parameter
t
, Propagation Delay
PLH
t
PHL
t
PLH,
t
PHL
CLK to On(’2525)
Propagation Delay
CLKn to On(’2526)
V
CC
Range
(V)
(Note 6)
5.0 4.6 6.5 9.0 4.0 10.1 ns
5.0 5.8 8.5 11.1 5.1 12.4 ns
Page 6
AC Electrical Characteristics
Over recommended operating conditions unless specified otherwise. (Continued)
V
CC
Symbol Parameter
Range
(V)
(Note 6)
t
, Propagation Delay
PLH
t
PHL
t
OSHL
SEL to On(’2526)
Maximum Skew
Common Edge
Output-to-Output (Note 7)
5.0 5.1 8.5 12.4 4.4 14.1 ns
5.0 0.2 550 ps
Variation
t
OSLH
Maximum Skew
Common Edge
Output-to-Output (Note 7)
5.0 0.2 550 ps
Variation
t
OST
Maximum Skew
Opposite Edge
Output-to-Output (Note 7)
5.0 0.4 1.0 ns
Variation
t
PV
Maximum Skew AC2525
Part-to-Part ACT2525
Variation (Note 8) AC2526 5.0 3.5 ns
ACT2526 5.0 5.0 ns
t
, Maximum
rise
t
fall
t
rise
t
fall
Rise/Fall Time 5.0 3.0 3.75 ns
(20% to 80% V
CC
)
, Maximum
Rise/Fall Time 0.9 1.1 ns
(0.8V/2.0V and 2.0V/0.8V)
Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: I
Note 4: Maximum test duration 2.0 ms, one output loaded at a time.
Note 5: I
Note 6: Voltage Range 5.0 is 5.0V
Note 7: 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
HL and LH (t
Note 8: Part-to-part skew is defined as the absolute value of the difference between the propagation delay for any outputs from device to device. The parameter is
specified for a given set of conditions (i.e., capacitive load, V
Note 9: Load capacitance includes the test jig.
@
and I
IN
I
CC
CC
3.0V are guaranteed to be less than or equal to the respective limit@5.5V VCC.
CC
for 54AC@25§C is identical to CGS74C@25§C.
for 54ACT@25§C is identical to CGS74CT@25§C.
). t
OST
OSHL
g
0.5V, voltage range 3.3 is 3.3Vg0.3V.
and t
are characterized and guaranteed by design@1 MHz.
OSLH
, temperature,Ýof outputs switching, etc.). Parameter guaranteed by design.
CC
CGS74CT 54ACT CGS74CT
eb
55§CT
T
ea
T
25§C
A
e
C
50 pF
L
A
a
125§Cto
to
e
C
50 pF C
L
eb
40§C
A
a
85§C Units
e
50 pF
L
Min Typ Max Min Max Min Typ Max
) or LOW to HIGH (t
OSHL
) or in opposite directions both
OSLH
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Page 7
Capacitance
Symbol Parameter Typ Units Conditions
C
IN
C
PD
C
PD
*fefrequency
Input Capacitance 4.5 pF V
b
Power Dissipation Capacitance (’2525) 820 pF–1.2 x 10
Power Dissipation Capacitance (’2526) 820 pF–1.2 x 10
18
(f)* pF V
b
18
(f)* pF V
CC
CC
CC
e
e
e
Recommended Maximum Power Dissipation (W)
LFPM
e
25§CT
T
A
e
85§C
A
PDIP SOIC PDIP SOIC
0 1.105 0.858 0.528 0.41
225 1.493 1.055 0.714 0.504
500 1.71 1.210 0.820 0.578
Timing Diagrams
5.0V
5.0V
5.0V
TL/F/10684– 27
Test Circuit
TL/F/10684– 29
RLis 500X
is 50 pF for all prop delays and skew measurements.
C
L
TL/F/10684– 28
http://www.national.com7
Page 8
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
TL/F/10684– 26
Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (M)
NS Package Number M14A
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Page 9
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Integrated Circuit (M)
NS Package Number M16A
14-Lead Plastic Dual-In-Line Package (N)
NS Package Number N14A
http://www.national.com9
Page 10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
CGS74CT2526
#
CGS74C2526
#
1-to-8 Minimum Skew Clock Driver
16-Lead Plastic Dual-In-Line Package (N)
NS Package Number N16E
CGS74CT2525
#
CGS74C2525
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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Corporation Europe Hong Kong Ltd. Japan Ltd.
1111 West Bardin Road Fax:
Arlington, TX 76017 Email: europe.support@nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408
Tel: 1(800) 272-9959 Deutsch Tel:
Fax: 1(800) 737-7018 English Tel:
http://www.national.com
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Fran3ais Tel:
Italiano Tel:a49 (0) 180-534 16 80 Fax: (852) 2736-9960
a
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a
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