3D7225S-200中文资料

MONOLITHIC 5-TAP FIXED DELAY LINE (SERIES 3D7225)

FEATURES

? All-silicon, low-power CMOS technology ? TTL/CMOS compatible inputs and outputs ?

Vapor phase, IR and wave solderable ? Auto-insertable (DIP pkg.) ? Low ground bounce noise

? Leading- and trailing-edge accuracy ? Delay range: 0.75ns through 3500ns ? Delay tolerance: 2% or 0.5ns

? Temperature stability: ±2% typical (-40C to 85C) ? Vdd stability: ±1% typical (4.75V-5.25V)

? Minimum input pulse width: 30% of total delay ? 8-pin Gull-Wing available as drop-in replacement for hybrid delay lines

FUNCTIONAL DESCRIPTION

The 3D7225 5-Tap Delay Line product family consists of fixed-delay CMOS integrated circuits. Each package contains a single delay line, tapped and buffered at 5 points spaced uniformly in time. Tap-to-tap (incremental) delay values can range from 0.75ns through 700ns. The input is reproduced at the outputs without inversion, shifted in time as per the user-specified dash number. The 3D7225 is TTL- and CMOS-compatible, capable of driving ten 74LS-type loads, and features both rising- and falling-edge accuracy.

The all-CMOS 3D7225 integrated circuit has been designed as a reliable, economic alternative to hybrid TTL fixed delay lines. It is offered in a standard 8-pin auto-insertable DIP and space saving surface mount 8-pin SOIC and 16-pin SOL packages.

PACKAGES

141312111098

1 2 3 4 5 6 7

IN NC NC O2NC O4GND

VDD NC O1 NC O3 NC O5

3D7225-xx DIP-14 3D7225G-xx Gull-Wing 3D7225K-xx Unused pins

remo 12345678

ved

161514131211109

IN NC NC O2NC O4NC GND

VDD NC NC O1 NC O3 NC O5

3D7225S-xx SOL-16

12348765IN O2O4GND VDD O1 O3 O5

3D7225Z-xx SOIC-8 3D7225M-xx DIP-8

3D7225H-xx Gull-Wing

PIN DESCRIPTIONS

IN Delay Line Input O1 Tap 1 Output (20%) O2 Tap 2 Output (40%) O3 Tap 3 Output (60%) O4 Tap 4 Output (80%) O5 Tap 5 Output (100%)

VDD +5 Volts GND Ground TABLE 1: PART NUMBER SPECIFICATIONS

TOLERANCES INPUT RESTRICTIONS DASH NUMBER TOTAL DELAY (ns) TAP-TAP DELAY (ns) Rec’d Max Frequency Absolute Max Frequency Rec’d Min Pulse Width Absolute Min Pulse Width

-.75 3.0 ± 0.5* 0.75 ± 0.4

41.7 MHz 166.7 MHz 12.0 ns 3.00 ns -1 4.0 ± 0.5* 1.0 ± 0.5

37.0 MHz 166.7 MHz 13.5 ns 3.00 ns -1.5 6.0 ± 0.5* 1.5 ± 0.7

31.2 MHz 166.7 MHz 16.0 ns 3.00 ns -2 8.0 ± 0.5* 2.0 ± 0.8

25.0 MHz 166.7 MHz 20.0 ns 3.00 ns -2.5 10.0 ± 0.5* 2.5 ± 1.0

22.2 MHz 125.0 MHz 22.5 ns 4.00 ns -4 16.0 ± 0.7* 4.0 ± 1.3

8.33 MHz 133.3 MHz 30.0 ns 6.00 ns -5 25.0 ± 1.0 5.0 ± 1.5

13.3 MHz 66.7 MHz 37.5 ns 7.50 ns -10 50.0 ± 1.0 10.0 ± 2.0

6.67 MHz 33.3 MHz 75.0 ns 15.0 ns -20 100.0 ± 2.0 20.0 ± 4.0

3.33 MHz 16.7 MHz 150 ns 30.0 ns -50 250.0 ± 5.0 50.0 ± 10

1.33 MHz 6.67 MHz 375 ns 75.0 ns -100 500.0 ± 10 100 ± 20

0.67 MHz 3.33 MHz 750 ns 150 ns -200 1000 ± 20 200 ± 40

0.33 MHz 1.67 MHz 1500 ns 300 ns -700

3500 ± 70 700 ± 140

0.10 MHz 0.48 MHz 5250 ns 1050 ns

* Total delay referenced to Tap1 output; Input-to-Tap1 = 5.0ns ± 1.0ns

NOTE: Any dash number between .75 and 700 not shown is also available as standard.

2005 Data Delay Devices

APPLICATION NOTES

OPERATIONAL DESCRIPTION

The 3D7225 five-tap delay line architecture is shown in Figure 1. The delay line is composed of a number of delay cells connected in series.

Each delay cell produces at its output a replica of the signal present at its input, shifted in time. The delay cells are matched and share the same compensation signals, which minimizes tap-to-tap delay deviations over temperature and supply voltage variations.

INPUT SIGNAL CHARACTERISTICS

The Frequency and/or Pulse Width (high or low) of operation may adversely impact the specified delay accuracy of the particular device. The reasons for the dependency of the output delay accuracy on the input signal characteristics are varied and complex. Therefore a Maximum and an Absolute Maximum operating input frequency and a Minimum and an Absolute Minimum operating pulse width have been specified.

OPERATING FREQUENCY

The Absolute Maximum Operating Frequency specification, tabulated in Table 1, determines the highest frequency of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable duty cycle distortion.

The Maximum Operating Frequency specification determines the highest frequency of the delay line input signal for which the output delay accuracy is guaranteed.

To guarantee the Table 1 delay accuracy for input frequencies higher than the Maximum Operating Frequency, the 3D7225 must be tested at the user operating frequency.

Therefore, to facilitate production and device identification, the part number will include a custom reference designator identifying the intended frequency of operation. The

programmed delay accuracy of the device is guaranteed, therefore, only at the user specified input frequency. Small input frequency variation about the selected frequency will only marginally impact the programmed delay accuracy, if at all. Nevertheless, it is strongly recommended that the engineering staff at DATA DELAY DEVICES be consulted.

OPERATING PULSE WIDTH

The Absolute Minimum Operating Pulse Width (high or low) specification, tabulated in Table 1, determines the smallest Pulse Width of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable pulse width distortion.

The Minimum Operating Pulse Width (high or low) specification determines the smallest Pulse Width of the delay line input signal for which the output delay accuracy tabulated in Table 1 is guaranteed.

To guarantee the Table 1 delay accuracy for input pulse width smaller than the Minimum Operating Pulse Width, the 3D7225 must be tested at the user operating pulse width. Therefore, to facilitate production and device identification, the part number will include a

VDD O1 IN

O2

O3

O4

Temp & VDD Compensation

GND

Figure 1: 3D7225 Functional Diagram

20% 20%20%20%20%

O5

APPLICATION NOTES (CONT’D)

custom reference designator identifying the intended frequency and duty cycle of operation. The programmed delay accuracy of the device is guaranteed, therefore, only for the user specified input characteristics. Small input pulse width variation about the selected pulse width will only marginally impact the programmed delay accuracy, if at all. Nevertheless, it is strongly recommended that the engineering staff at DATA DELAY DEVICES be consulted.

POWER SUPPLY AND TEMPERATURE CONSIDERATIONS The delay of CMOS integrated circuits is strongly dependent on power supply and temperature. The monolithic 3D7225 programmable delay line utilizes novel and innovative compensation circuitry to minimize the delay variations induced by fluctuations in power supply and/or temperature.

The thermal coefficient is reduced to 250 PPM/C, which is equivalent to a variation, over the -40C to 85C operating range, of ±2% from the room-temperature delay settings and/or1.0ns, whichever is greater. The power supply coefficient is reduced, over the 4.75V-5.25V operating range, to ±1% of the delay settings at the nominal 5.0VDC power supply and/or1.0ns, whichever is greater. It is essential that the power supply pin be adequately bypassed and filtered. In addition, the power bus should be of as low an impedance construction as possible. Power planes are preferred.

DEVICE SPECIFICATIONS

TABLE 2: ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL MIN MAX

UNITS

NOTES DC Supply Voltage V DD -0.3 7.0 V

Input Pin Voltage V IN -0.3

V DD+0.3 V

Input Pin Current I IN -1.0 1.0 mA

25C Storage Temperature T STRG -55 150 C

Lead Temperature T LEAD300 C

10

sec

TABLE 3: DC ELECTRICAL CHARACTERISTICS

(-40C to 85C, 4.75V to 5.25V)

PARAMETER SYMBOL

MIN

TYP

MAX

UNITS

NOTES Static Supply Current* I DD 3.5

5.5

mA

High Level Input Voltage V IH 2.0 V

Low Level Input Voltage V IL0.8 V

High Level Input Current I IH 1.0

μA V IH = V DD

Low Level Input Current I IL 1.0

μA V IL = 0V

High Level Output Current I OH-35.0

-4.0

mA

V DD = 4.75V

V OH = 2.4V

Low Level Output Current I OL 4.0

15.0 mA

V DD = 4.75V

V OL = 0.4V Output Rise & Fall Time T R & T F 2.0 2.5 ns C LD = 5 pf *I DD(Dynamic) = 5 * C LD * V DD * F Input Capacitance = 10 pf typical where: C LD = Average capacitance load/tap (pf) Output Load Capacitance (C LD) = 25 pf max

F = Input frequency (GHz)

SILICON DELAY LINE AUTOMATED TESTING

TEST CONDITIONS

INPUT: OUTPUT:

Ambient Temperature: 25o C ± 3o

C R load : 10K ? ± 10%

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. 10K ?470?5pf

Device Under Test Digital Scope Rise/Fall Time: 3.0 ns Max. (measured

between 0.6V and 2.4V ) Pulse Width: PW IN = 1.25 x Total Delay

Period: PER IN = 2.5 x Total Delay

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

Figure 2: Test Setup

Figure 3: Timing Diagram

t PLH

t PHL

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