NSC CGS2536VX Datasheet

TL/F/12325

CGS2536V Commercial Quad 1 to 4 Clock Drivers

CGS2536TV Industrial Quad 1 to 4 Clock Drivers

September 1995

CGS2536V
Commercial Quad 1 to 4 Clock Drivers
CGS2536TV
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 MHz and 100 MHz Pentium

TM

procrssors.

The CGS2536 I/O structures are CMOS. The outputs are
separated into two banks of eight. One bank consists of
divide by two outputs, the other, straight-through buffers.
Within each bank, half the outputs are inverting, the other
half non-inverting.

The CGS2536 specification guarantees part-to-part skew
variation.

Features

Y

Guaranteed:
Ð 1.0 ns rise and fall times while driving 12 inches of

50X microstrip terminated with 25 pF

Ð 350 ps pin-to-pin skew (t

OSLH

and t

OSHL

)

Y

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

Y

Operates with either 3.3V or 5.0V supply

Y

Inputs 5V tolerant with VCCin 3.3V range

Y

Symmetric output current drive: 24 mA IOH/I

OL

Y

Industrial temperature ofb40§Ctoa85§C

Y

Symmetric package orientation

Y

Large fanout for memory driving applications

Y

Guaranteed 2 kV ESD protection

Y

Implemented on National’s ABT family process

Y

28-pin PLCC for optimum skew performance

Connection Diagrams

Pin Assignment for 28-Pin PLCC

TL/F/12325– 1

Truth Table

Input Output

In 0 ABCD Out (0)d2

In 1 ABCD Out (1)d2

In 2 ABCD Out (2)

In 3 ABCD Out (3)

CGS2536

TL/F/12325– 2Pentium

TM

is a trademark of Intel Corporation.

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage (V

CC

) 7.0V

Input Voltage (VI) 7.0V

Input Current

b

30 mA

Current Applied to Output

(High/Low) Twice the Rated IOH/IOL

Operating Temperature

Industrial Grade

b

40§Ctoa85§C

Commercial grade 0

§

Ctoa70§C

Storage Temperature Range

b

65§Ctoa150§C

Airflow Typical i

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 VCC4.5V to 5.5V

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

§

Ctoa70§C

Industrial

b

40§Ctoa85§C

Note: 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

e

5V, T

A

e

25§C.

Symbol Parameter Conditions

V

CC

Min Typ Max Units

(V)

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

eb

18 mA 4.5

b

1.2 V

V

OH

High Level Output Voltage I

OH

eb

50 mA 3.0 2.9

V

4.5 4.4

5.5 5.4

I

OH

eb

24 mA 3.0 2.46

V

4.5 3.76

5.5 4.76

V

OL

Low Level Output Voltage I

OL

e

50 mA 3.0 0.1

V

4.5 0.1

5.5 0.1

I

OL

e

24 mA 3.0 0.44

V

4.5 0.44

5.5 0.44

I

I

Input Current@Max Input Voltage V

IH

e

7V 5.5 7

mA

V

IH

e

V

CC

3.6 1

I

IH

High Level Input Current V

IH

e

V

CC

5.5 5 mA

I

IL

Low Level Input Current V

IL

e

0V 5.5

b

5 mA

I

OLD

Minimum Dynamic Output Current* V

OLD

e

1.65V (max) 5.5 75
mA

V

OLD

e

0.9V (max) 3.0** 36

I

OHD

Minimum Dynamic Output Current* V

OHD

e

3.85V (min) 5.5

b

75

mA

V

OHD

e

2.1V (min) 3.0**

b

25

I

CC

Supply Current 3.6 75

mA

5.5 235

C

IN

Input Capacitance 5.0 5 pF

*Maximum test duration 2.0 ms, one output loaded at a time.

**At V

CC

e

3.3V, I

OLD

e

55 mA min;@V

CC

e

3.6V, I

OLD

e

64 mA min

At V

CC

e

3.3V, I

OHD

eb

58 mA min;@V

CC

e

3.6V, I

OHD

eb

66 mA min

2

AC Electrical Characteristics (Notes 1, 2, and 3)

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

CC

e

5V, T

A

e

25§C.

Symbol Parameter

CGS2536

Units

V

CC

T

A

ea

25§C

T

A

eb

40§Ctoa85§C

(V)

C

L

e

50 pF, R

L

e

500X

(Note 4)

(Note 8) C

L

e

50 pF, R

L

e

500X

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 7.25 7.25

ns

CK to O

n

5.0 5.0 5.0

t

PHL

High-to-Low Propagation Delay 3.3 5.5 5.5

ns

CK to O

n

5.0 4.5 4.5

t

OSLH

Maximum Skew Common Edge 3.3 150 350 300 350

ps

Output-to-Output Variation (Notes 1, 3) 5.0 150 350 300 350

t

OSHL

Maximum Skew Common Edge 3.3 150 350 300 350

ps

Output-to-Output Variation (Notes 1, 3) 5.0 150 350 300 350

t

rise

, Rise/Fall Time 3.3 4.5 4.5

ns

t

fall

(from 0.8V/2.0V to 2.0V/0.8V) (Note 5) 5.0 3.5 3.5

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 6) 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 7) 5.0 0.7 0.9

t

High

Pulse Width Duration High (Notes 2, 3) 3.3 4.0 4.0

ns

5.0 4.0 4.0

t

Low

Pulse Width Duration Low (Notes 2, 3) 3.3 4.0 4.0

5.0 4.0 4.0

t

PVLH

Part-to-Part Variation of 3.3 650 650

ps

Low-to-High Transitions 5.0 650 650

t

PVHL

Part-to-Part Variation of 3.3 650 650
High-to-Low Transitions 5.0 650 650

Note 1: 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 LOW to HIGH (t

OSLH

) or HIGH to LOW (t

OSHL

).

Note 2: 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

measurement: fe66.67 MHz, duty cyclee50%.

Note 3: The input waveform has a rise and fall time transition time of 2.5 ns (10% to 90%).

Note 4: Industrial range (

b

40§Ctoa85§C) limits apply to the commercial temperature range (0§Ctoa70§C).

Note 5: These Rise and Fall times are measured with C

L

e

50 pF, R

L

e

500X (see

Figure 3

).

Note 6: These Rise and Fall times are measured with C

L

e

25 pF, R

L

e

500X (see

Figure 3

), and are guaranteed by design.

Note 7: These Rise and Fall times are measured driving 12 inches of 50X microstrip terminated with equivalent C

L

e

25 pF (see

Figure 4

), and are guaranteed by

design.

Note 8: Voltage Range 5.0 is 5.0V

g

0.5V, 3.3 is 3.3Vg0.3V.

Note 9: For increased output drive, output pins may be connected together when the corresponding input pins are connected together.

3