NSC CGS2535TV, CGS2535TVX Datasheet

CGS2535V/CGS2535TV
Commercial Quad 1 to 4 Clock Drivers/Industrial Quad
1 to 4 Clock Drivers

General Description

These Clock Generation and Support clock drivers are spe­cifically designed for driving memory arrays requiring large
fanouts while operating at high speeds.

This device meets the rise and fall time requirements of the
90 and 100 MHz Pentium

™

processors.

The CGS2535 is a non-inverting 4 to 16 driver with CMOS
I/O structures. The CGS2535 specification guarantees
part-to-part skew variation.

Features

n Guaranteed:

— 1.0 ns rise and fall times while driving 12 inches of

50Ω microstrip terminated with 25 pF

— 350 ps pin-to-pin skew (t

OSLH

and t

OSHL

)

n 650 ps part-to-part variation on positive or negative

transition

@

5V V

CC

n Operates with either 3.3V or 5.0V supply
n Inputs 5V tolerant with V

CC

in 3.3V range

n Symmetric output current drive: 24 mA I

OH/IOL

n Industrial temperature range −40˚C to +85˚C
n Symmetric package orientation
n Large fanout for memory driving applications
n Guaranteed 2 kV ESD protection
n Implemented on National’s ABT family process
n 28-pin PLCC for optimum skew performance

Connection Diagrams

Truth Table

Input Output

In (0–3) ABCD Out (0–3)

Pentium™is a trademark of Intel Corporation.

Pin Assignment for 28-Pin PLCC

DS011954-5

CGS2535

DS011954-2

March 1997

CGS2535V Commercial Quad 1 to 4 Clock Drivers/CGS2535TV Industrial Quad 1 to 4 Clock

Drivers

© 1997 National Semiconductor Corporation DS011954 http:\\www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contactthe National SemiconductorSales Office/
Distributors for availability and specifications.

Supply Voltage (V

CC

) 7.0V

Input Voltage (V

I

) 7.0V
Input Current −30 mA
Current Applied to Output

(High/Low) Twice the Rated I

OH/IOL

Operating Temp. Industrial grade −40˚C to +85˚C

Comm. grade 0˚C to +70˚C

Storage Temperature Range −65˚C to +150˚C

Airflow Typical θ

JA

0 LFM 62˚C/W
225 LFM 43˚C/W
500 LFM 34˚C/W

900 LFM 27˚C/W

Recommended Operating
Conditions

Supply Voltage VCC4.75V to 5.25V

V

CC

3.0V to 3.6V

Maximum Input Rise/Fall Time

(0.8V to 2.0V) 5 ns

Free Air Operating Temperature

Commercial 0˚C to + 70˚C
Industrial −40˚C to + 85˚C

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.

DC Electrical Characteristics

Over recommended operating free air temperature range. All typical values are measured at V

CC

=

5V, T

A

=

25˚C.

Symbol Parameter Conditions V

CC

(V) Min Typ Max Units

V

IH

Input High Level Voltage 3.0 2.1 V

4.5 3.15

5.5 3.85

V

IL

Input Low Level Voltage 3.0 0.9 V

4.5 1.35

5.5 1.65

V

IK

Input Clamp Voltage I

I

=

−18 mA 4.5 −1.2 V

V

OH

High Level Output Voltage I

OH

=

−50 µA 3.0 2.9 V

4.5 4.4

5.5 5.4

I

OH

=

−24 mA 3.0 2.46 V

4.5 3.76

5.5 4.76

V

OL

Low Level Output Voltage I

OL

=

50 µA 3.0 0.1 V

4.5 0.1

5.5 0.1

I

OL

=

24 mA 3.0 0.44 V

4.5 0.44

5.5 0.44

I

I

Input Current@Max Input Voltage V

IH

=

7V 5.5 7 µA

V

IH

=

V

CC

3.6 1

I

IH

High Level Input Current V

IH

=

V

CC

5.5 5 µA

I

IL

Low Level Input Current V

IL

=

0V 5.5 −5 µA

I

OLD

Minimum Dynamic Output Current
(Note 2)

V

OLD

=

1.65V (max) 5.5 75 mA

V

OLD

=

0.9V (max) 3.0 (Note 3) 36

I

OHD

Minimum Dynamic Output Current
(Note 2)

V

OHD

=

3.85V (min) 5.5 −75 mA

V

OHD

=

2.1V (min) 3.0 (Note 3) −25

I

CC

Supply Current 3.6 75 µA

5.5 235

C

IN

Input Capacitance 5.0 5 pF

Note 2: Maximum test duration 2.0 ms, one output loaded at a time.
Note 3: At V

CC

=

3.3V, I

OLD

=

55 mA min;

@

V

CC

=

3.6V, I

OLD

=

64 mA min

At V

CC

=

3.3V, I

OHD

=

−58 mA min;

@

V

CC

=

3.6V, I

OHD

=

−66 mA min

http:\\www.national.com 2

AC Electrical Characteristics (Notes 4, 5, and 6)

Over recommended operating free air temperature specified. All typical values are measured at V

CC

=

5V, T

A

=

25˚C.

Symbol Parameter

CGS2535

Units

V

CC

T

A

=

+25˚C T

A

=

−40˚C to +85˚C

(V) C

L

=

50 pF, R

L

=

500Ω (Note 7)

(Note 11) C

L

=

50 pF, R

L

=

500Ω

Min Typ Max Min Typ Max

f

max

Frequency Maximum 3.0 100 MHz

5.0 125

t

PLH

Low-to-High Propagation Delay 3.3 4.5 2.5 4.5 ns
CK to O

n

@

1 MHz (Note 13) 5.0 3.5 2.0 3.5

t

PHL

High-to-Low Propagation Delay 3.3 4.5 2.5 4.5 ns
CK to O

n

@

1 MHz (Note 13) 5.0 3.5 2.0 3.5

t

PLH

Low-to-High Propagation Delay 3.3 5.0 2.5 5.0 ns
CK to O

n

@

66.67 MHz (Note 13) , (Note

14)

5.0 4.5 2.0 4.5

t

PHL

High-to-Low Propagation Delay 3.3 5.0 2.5 5.0 ns
CK to O

n

@

66.67 MHz (Note 13) , (Note

14)

5.0 4.5 2.0 4.5

t

OSLH

Maximum Skew Common Edge 3.3 150 350 300 350 ps
Output-to-Output Variation 5.0 150 350 300 350
(Note 4) , (Note 6)

t

OSHL

Maximum Skew Common Edge 3.3 150 350 300 350 ps
Output-to-Output Variation 5.0 150 350 300 350
(Note 4) , (Note 6)

t

rise

, Rise/Fall Time 3.3 3.5 3.5 ns

t

fall

(from 0.8V/2.0V to 2.0V/0.8V) (Note 8) 5.0 3.0 3.0

t

rise

, Rise/Fall Time 3.3 0.8 1.0 ns

t

fall

(from 0.8V/2.0V to 2.0V/0.8V) (Note 9) ,
(Note 14)

5.0 0.4 0.6

t

rise

, Rise/Fall Time 3.3 1.0 1.0 ns

t

fall

(from 0.8V/2.0V to 2.0V/0.8V) (Note 10) ,
(Note 14)

5.0 0.7 0.9

t

High

Pulse Width Duration High 3.3 4.0 4.0 ns
(Note 5) , (Note 6) , (Note 14) 5.0 4.0 4.0

t

Low

Pulse Width Duration Low 3.3 4.0 4.0
(Note 5) , (Note 6) , (Note 14) 5.0 4.0 4.0

t

PVLH

Part-to-Part Variation of 3.3 650 1.0 ns
Low-to-High Transitions 5.0 650 650 ps

@

1 MHz (Note 13)

t

PVHL

Part-to-Part Variation of 3.3 650 1.0 ns
High-to-Low Transitions 5.0 650 650 ps

@

1 MHz (Note 13)

t

PVLH

Part-to-Part Variation of 3.3 1.0 1.0

ns

Low-to-High Transitions 5.0 1.0 1.0

@

66.67 MHz (Note 13) , (Note 14)

t

PVHL

Part-to-Part Variation of 3.3 1.0 1.0
High-to-Low Transitions 5.0 1.0 1.0

@

66.67 MHz (Note 13) , (Note 14)

Note 4: 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 and output bank. The specifications apply to any outputs switching in the same direction either LOW to HIGH (t

OSLH

) or HIGH to LOW (t

OSHL

).

Note 5: Time high is measured with outputs at 2.0V or above. Time low is measured with outputs at 0.8V or below. Input waveform characteristics for t

High,tLow

mea-

surement: f=66.67 MHz, duty cycle=50%.

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