3D7205
MONOLITHIC 5-TAP
FIXED DELAY LINE
(SERIES 3D7205)
FEATURES PACKAGES
1
2
3
4
8
7
6
5
IN
O2
O4
GND
VDD
O1
O3
O5
3D7205Z
SOIC
(150 Mil)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN
N/C
N/C
O2
N/C
O4
N/C
GND
VDD
N/C
N/C
O1
N/C
O3
N/C
O5
3D7205S SOL
(300 Mil)
8
7
6
5
1
2
3
4
IN
O2
O4
GND
VDD
O1
O3
O5
3D7205M DIP
3D7205H Gull-Wing
14
13
12
11
10
9
8
1
2
3
4
5
6
7
IN
N/C
N/C
O2
N/C
O4
GND
VDD
N/C
O1
N/C
O3
N/C
O5
3D7205 DIP
3D7205G Gull-Wing
3D7205K Unused pins
removed
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: 8 through 500ns
Delay tolerance: 5% or 2ns
Temperature stability: 3% typical (0C-70C)
Vdd stability: 2% typical (4.75V-5.25V)
Minimum input pulse width: 20% of total delay
14-pin DIP and 16-pin SOIC available as drop-in
For mechanical dimensions, click
here
.
For package marking details, click
here
.
replacements for hybrid delay lines
FUNCTIONAL DESCRIPTION
The 3D7205 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 8.0ns through 100ns. The
input is reproduced at the outputs without inversion, shifted in time as
per the user-specified dash number. The 3D7205 is TTL- and CMOS-
compatible, capable of driving ten 74LS-type loads, and features both
rising- and falling-edge accuracy.
The all-CMOS 3D7205 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 a space saving surface mount 8-pin SOIC.
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
N/C No
Connection
TABLE 1: PART NUMBER SPECIFICATIONS
PART NUMBER
TOLERANCES
INPUT RESTRICTIONS
DIP-8
3D7205M
3D7205H
SOIC-8
3D7205Z
DIP-14
3D7205
3D7205
G
3D7205K
SOIC-16
3D7205S
TOTAL
DELAY (ns)
TAP-TAP
DELAY
(ns)
Max
Operating
Frequency
Absolute
Max
Oper. Freq.
Min
Operating
Pulse Width
Absolute
Min
Oper. P.W.
-8 -8 -8 -8
40.0
2.0
8.0
1.5
9.52 MHz
71.4 MHz
52.5 ns
7.0 ns
-10 -10 -10 -10
50.0
2.5
10.0
2.0
6.67 MHz
50.0 MHz
75.0 ns
10.0 ns
-15 -15 -15 -15
75.0
3.8
15.0
2.3
4.44 MHz
33.3 MHz
113 ns
15.0 ns
-20 -20 -20 -20 100
5.0
20.0
2.5
3.33 MHz
25.0 MHz
150 ns
20.0 ns
-25 -25 -25 -25 125
6.3
25.0
2.5
2.66 MHz
20.0 MHz
188 ns
25.0 ns
-30 -30 -30 -30 150
7.5
30.0
3.0
2.22 MHz
16.7 MHz
225 ns
30.0 ns
-50 -50 -50 -50
250
12.5
50.0
5.0
1.33 MHz
10.0 MHz
375 ns
50.0 ns
-75 -75 -75 -75
375
18.8
75.0
7.5
0.89 MHz
6.67 MHz
563 ns
75.0 ns
-100 -100 -100 -100
500
25.0 100 10.0
0.67 MHz
5.00 MHz
750 ns
100.0 ns
Doc #96007
DATA DELAY DEVICES, INC.
1
12/2/96
3 Mt. Prospect Ave. Clifton, NJ 07013
3D7205
APPLICATION NOTES
OPERATIONAL DESCRIPTION
The 3D7205 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 3D7205 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 3D7205 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: 3D7205 Functional Diagram
20%
20%
20%
20%
20%
O5
Doc #96007
DATA DELAY DEVICES, INC.
2
12/2/96
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
3D7205
Doc #96007
DATA DELAY DEVICES, INC.
3
12/2/96
3 Mt. Prospect Ave. Clifton, NJ 07013
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 3D7205 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 600
PPM/C, which is equivalent to a variation , over
the 0C-70C operating range, of
3% from the
room-temperature delay settings. The power
supply coefficient is reduced, over the 4.75V-
5.25V operating range, to
2% of the delay
settings at the nominal 5.0VDC power supply. 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
LEAD
300
C
10
sec
TABLE 3: DC ELECTRICAL CHARACTERISTICS
(0C to 70C, 4.75V to 5.25V)
PARAMETER SYMBOL
MIN
MAX
UNITS
NOTES
Static Supply Current*
I
DD
15
mA
High Level Input Voltage
V
IH
2.0 V
Low Level Input Voltage
V
IL
0.8
V
High Level Input Current
I
IH
1
A
V
IH
= V
DD
Low Level Input Current
I
IL
-250
A
V
IL
= 0V
High Level Output Current
I
OH
-4.0
mA
V
DD
= 4.75V
V
OH
= 2.4V
Low Level Output Current
I
OL
4.0 mA
V
DD
= 4.75V
V
OL
= 0.4V
Output Rise & Fall Time
T
R
& T
F
2 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)
3D7205
SILICON DELAY LINE AUTOMATED TESTING
TEST CONDITIONS
INPUT:
OUTPUT:
Ambient Temperature: 25
o
C
3
o
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.
OUT1
OUT2
OUT4
OUT3
OUT
TRIG
IN
REF
TRIG
Figure 2: Test Setup
DEVICE UNDER
TEST (DUT)
DIGITAL SCOPE/
TIME INTERVAL COUNTER
PULSE
GENERATOR
COMPUTER
SYSTEM
PRINTER
IN
OUT5
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
Doc #96007
DATA DELAY DEVICES, INC.
4
12/2/96
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
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