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PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

1

1/15/97

3 Mt. Prospect Ave.  Clifton, NJ  07013

8-BIT PROGRAMMABLE

PULSE GENERATOR

(SERIES PPG38F)

FEATURES

PACKAGES

• 

Digitally programmable in 256 steps

• 

Monotonic pulse-width-vs-address variation

• 

Rising edge triggered

• 

Two separate outputs: inverting & non-inverting

• 

Precise and stable pulse width

• 

Input & outputs fully TTL interfaced & buffered

• 

10 T

2

L fan-out capability

• 

Fits standard 40-pin DIP socket

• 

Auto-insertable

FUNCTIONAL DESCRIPTION

The PPG38F-series device is a 8-bit digitally programmable pulse

generator.  The width, PW

A

, depends on the address code (A7-A0)

according to the following formula:

PW

A

  = PW

0

  +  T

INC

 * A

where A is the address code, T

INC

 is the incremental pulse width of the

device, and PW

0

 is the inherent pulse width of the device.  The

incremental width is specified by the dash number of the device and can range from 0.5ns through 400ns,

inclusively.  RESET is held LOW during normal operation.  When it is brought HIGH, OUT and OUT/ are

forced into LOW and HIGH states, respectively, and the unit is ready for the next trigger input.  The

address is not latched and must remain asserted while the output pulse is active.

SERIES SPECIFICATIONS

• 

Programmed pulse width tolerance: 5% or 2ns,

whichever is greater

• 

Inherent width (PW

0

): 20ns typical

• 

Inherent delay (T

TO

): 10ns 

±

 2ns

• 

Operating temperature: 0

°

 to 70

°

 C

• 

Supply voltage V

CC

: 5VDC 

±

 5%

• 

Supply current:

I

CC

 = 80ma typical

©

©

1997 Data Delay Devices

data

delay

devices,

  inc.

®

®

3

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

TRIG

N/C

OUT

GND

N/C

N/C

RES

GND

N/C

N/C

N/C

GND

N/C

N/C

N/C

GND

A7

N/C

N/C

GND

VCC

OUT/

N/C

N/C

VCC

A0

A1

A2

VCC

A3

A4

A5

VCC

N/C

N/C

VCC

N/C

A6

N/C

N/C

PPG38F-xx

DIP

PPG38F-xxC5

Gull-Wing

PPG38F-xxM

Military DIP

PPG38F-xxMC5

Military Gull-Wing

PIN DESCRIPTIONS

TRIG Trigger Input

OUT

Non-inverted Output

OUT/ Inverted Output

A0-A7 Address Bits

RES

Reset

VCC

+5 Volts

GND Ground

DASH NUMBER SPECIFICATIONS

Part

Number

Incremental Width

Per Step (ns)

Total Width

Change (ns)

PPG38F-.5

.5 

±

 .3

127.5 

±

 6.4

PPG38F-1

±

 .5

255 

±

 12.8

PPG38F-2

±

 .5

510 

±

 25.5

PPG38F-5

±

 1.5

1,275 

±

 63.8

PPG38F-10

10 

±

 2.0

2,550 

±

 127.5

PPG38F-20

20 

±

 2.0

5,100 

±

 255.0

PPG38F-50

50 

±

 2.5

12,750 

±

 637.5

PPG38F-100

100 

±

 5.0

25,500 

±

 1275

PPG38F-200

200 

±

 10.0

51,000 

±

 2550

PPG38F-400

400 

±

 20.0

102,000 

±

 5100

NOTE: Any dash number between .5 and 400 not

shown is also available.

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PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

2

1/15/97

Tel: 201-773-2299     Fax: 201-773-9672     http://www.datadelay.com

APPLICATION NOTES

DEVICE TIMING

The timing definitions and restrictions for the

PPG38F are shown in Figure 1.  The unit is

activated by a rising edge on the TRIG input.

After a time, T

TO

 (called the inherent delay), the

rising edge of the pulse appears at OUT.  The

duration of the pulse is given by the above

equation.  For the duration of the pulse, the

device ignores subsequent triggers.  Once the

falling edge of the pulse has appeared at OUT,

an additional time, T

OTR

, is required before the

device can respond to the next trigger.

At power-up, the state of the PPG38F is

unknown.  Consequently, after power is applied,

the unit may not respond to input triggers for a

time equal to the maximum pulse width, PW

T

.

After this time, the unit will function properly.  If

your application requires that the device function

immediately, issue a quick reset at power-up.

POWER SUPPLY BYPASSING

The PPG38F relies on a stable power supply to

produce repeatable pulses within the stated

tolerances.  A 0.1uf capacitor from VCC to GND,

located as close as possible to each VCC pin, is

recommended.  A wide VCC trace should

connect all VCC pins externally, and a clean

ground plane should be used.

INCREMENT TOLERANCES

Please note that the increment tolerances listed

represent a design goal.  Although most

increments will fall within tolerance, they are not

guaranteed throughout the address range of the

unit.  Monotonicity is, however, guaranteed over

all addresses.

`

T

OAX

T

RTS

T

TW

T

TO

PW

A

A7-A0

RES

TRIG

OUT

OUT/

Figure 1: Timing Diagram

A

 i

A

i+1

T

SKEW

T

ATS

T

RO

T

OTR

T

TW

T

RW

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PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

3

1/15/97

3 Mt. Prospect Ave.  Clifton, NJ  07013

DEVICE SPECIFICATIONS

TABLE 1:  AC CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

Total Programmable Pulse Width

PW

T

255

T

INC

Inherent Pulse Width

PW

0

15.0

20.0

27.0

ns

Trigger to Output Delay

T

TO

8.0

10.0

12.0

ns

Reset to Output Delay

T

RO

17.0

ns

Output Skew

T

SKEW

1.5

ns

Trigger Pulse Width

T

TW

5.0

ns

Reset Pulse Width

T

RW

10.0

ns

Reset to Trigger Setup Time

T

RTS

9.0

ns

Address to Trigger Setup Time

T

ATS

6.0

ns

Output Low to Address Change

T

OAX

0.0

ns

Output to Trigger Recovery Time

T

OTR

10.0

ns

TABLE 2:  ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

MIN

MAX

UNITS

NOTES

DC Supply Voltage

V

CC

-0.3

7.0

V

Input Pin Voltage

V

IN

-0.3

V

DD

+0.3

V

Storage Temperature

T

STRG

-55

150

C

Lead Temperature

T

LEAD

300

C

10 sec

TABLE 3:  DC ELECTRICAL CHARACTERISTICS

(0C to 70C, 4.75V to 5.25V)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

High Level Output Voltage

V

OH

2.5

3.4

V

V

CC

 = MIN, I

OH

 = MAX

V

IH

 = MIN, V

IL

 = MAX

Low Level Output Voltage

V

OL

0.35

0.5

V

V

CC

 = MIN, I

OL

 = MAX

V

IH

 = MIN, V

IL

 = MAX

High Level Output Current

I

OH

-1.0

mA

Low Level Output Current

I

OL

20.0

mA

High Level Input Voltage

V

IH

2.0

V

Low Level Input Voltage

V

IL

0.8

V

Input Clamp Voltage

V

IK

-1.2

V

V

CC

 = MIN, I

I

 = I

IK

Input Current at Maximum

Input Voltage

I

IHH

0.1

mA

V

CC

 = MAX, V

I

 = 7.0V

High Level Input Current

I

IH

20

µ

A

V

CC

 = MAX, V

I

 = 2.7V

Low Level Input Current

I

IL

-0.6

mA

V

CC

 = MAX, V

I

 = 0.5V

Short-circuit Output Current

I

OS

-60

-150

mA

V

CC

 = MAX

Output High Fan-out

25

Unit

Output Low Fan-out

12.5

Load

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PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

4

1/15/97

Tel: 201-773-2299     Fax: 201-773-9672     http://www.datadelay.com

PACKAGE DIMENSIONS

2.100 MAX.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

.280

MAX.

.015 TYP.

.070 MAX.

.018 TYP.

.580

MAX.

.650

MAX.

.010

±

.002

Lead Material:

Nickel-Iron alloy 42

TIN PLATE

20

19

18

17

24

23

22

21

29

30

31

32

33

34

35

25

26

27

28

36

37

38

39

40

.100 TYP.

DIP (PPG38F-xx, PPG38F-xxM)

2.080

±

.020

.882

±

.005

.020 TYP.

.040 TYP.

.100

.090

1.100

.280

MAX.

.590

MAX.

.010

±

.002

.050

±

.010

.710

±

.005

.007

±

.005

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

Gull-Wing (PPG38F-xxC5, PPG38F-xxMC5)

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PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

5

1/15/97

3 Mt. Prospect Ave.  Clifton, NJ  07013

DELAY LINE AUTOMATED TESTING

TEST CONDITIONS

INPUT:

OUTPUT:

Ambient Temperature: 25

o

±

 3

o

C

Load:

1 FAST-TTL Gate

Supply Voltage (Vcc): 5.0V 

±

 0.1V

C

load

:

5pf 

±

 10%

Input Pulse:

High = 3.0V 

±

 0.1V

Threshold:

1.5V (Rising & Falling)

Low = 0.0V 

±

 0.1V

Source Impedance:

50

 Max.

Rise/Fall Time:

3.0 ns Max. (measured

between 0.6V and 2.4V )

Pulse Width:

PW

IN

 = 10ns

Period:

PER

IN

 = 2 x Max. Pulse Width

NOTE: The above conditions are for test only and do not in any way restrict the operation of the device.

OUT

OUT

TRIG

IN

REF

TRIG

Test Setup

DEVICE UNDER

TEST (DUT)

TIME INTERVAL

COUNTER

PULSE

GENERATOR

COMPUTER

SYSTEM

PRINTER

IN

Timing Diagram For Testing

PW

A

PER

IN

PW

IN

T

RISE

T

FALL

0.6V

0.6V

1.5V

1.5V

2.4V

2.4V

1.5V

1.5V

V

IH

V

IL

V

OH

V

OL

INPUT

SIGNAL

OUTPUT

SIGNAL

T

TO