DDU37F
MECHANICALLY VARIABLE
TTL DELAY LINE
(SERIES DDU37F)
FEATURES
•
•
•
•
•
•
•
•
•
•
Ideal for “Set and Forget” applications
Multi-turn adjustment screw (approx. 40 turns)
Input & output fully TTL interfaced & buffered
2
(10 T L fan-out capability)
Resolution:
As low as 0.12ns
Minimum delay (T
D0
):
6ns typical
Output rise time:
2ns typical
Min. input pulse width:
20% of maximum delay
Power dissipation:
230mW maximum
Operating temperature:
0° to 70°C (Commercial)
-55° to 125°C (Military)
Temperature coefficient:
100 PPM/°C
data
3
®
delay
devices,
inc.
PACKAGES
VCC OUT
NC
DDU37F
IN
GND
DDU37F-xx
(Commercial)
DDU37F-xxM (Military)
xx = Dash number
FUNCTIONAL DESCRIPTION
The DDU37F-series device is a mechanically variable, FAST-TTL interfaced
delay line. The signal input (IN) is reproduced at the tap output (OUT), shifted
by an amount which can be adjusted between T
D0
and T
D0
+ T
DVAR
, where
T
DVAR
is given by the device dash number (See Table). The device operates
from a single 5V supply and is TTL interfaced, capable of driving up to 10
TTL loads.
PIN DESCRIPTIONS
IN
OUT
VCC
GND
NC
Signal Input
Fixed Output
+5V
Ground
No connection
SERIES SPECIFICATIONS
IN
OUT
DASH NUMBER
SPECIFICATIONS
Part
Number
DDU37F-25
DDU37F-30
DDU37F-40
DDU37F-50
DDU37F-60
DDU37F-70
DDU37F-80
DDU37F-100
DDU37F-120
DDU37F-150
DDU37F-200
T
DVAR
(ns)
15
20
30
40
50
60
70
90
100
130
180
GND
Functional Diagram
VCC OUT
NC
.565
MAX
IN
GND
Note: Other delay times
available on request
.187
1.750
.285
.125
.020
.100
.200
1.640
.200
MIN
.100
.060
.100
.060
.430
Package Dimensions
©
2001 Data Delay Devices
Doc #01016
11/12/01
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
1
DDU37F
APPLICATION NOTES
HIGH FREQUENCY RESPONSE
The DDU37F tolerances are guaranteed for input
pulse widths and periods greater than those
specified in the test conditions. Although the
device will function properly for pulse widths as
small as 20% of the total delay and periods as
small as 40% of the total delay (for a symmetric
input), the delays may deviate from their values at
low frequency. However, for a given input
condition, the deviation will be repeatable from
pulse to pulse. Contact technical support at Data
Delay Devices if your application requires device
testing at a specific input condition.
POWER SUPPLY BYPASSING
The DDU37F relies on a stable power supply to
produce repeatable delays within the stated
tolerances. A 0.1uf capacitor from VCC to GND,
located as close as possible to the VCC pin, is
recommended. A wide VCC trace and a clean
ground plane should be used.
DEVICE SPECIFICATIONS
TABLE 1: ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Supply Voltage
Input Pin Voltage
Storage Temperature
Lead Temperature
SYMBOL
V
CC
V
IN
T
STRG
T
LEAD
MIN
-0.3
-0.3
-55
MAX
7.0
V
DD
+0.3
150
300
UNITS
V
V
C
C
NOTES
10 sec
TABLE 2: DC ELECTRICAL CHARACTERISTICS
(0C to 70C, 4.75V to 5.25V)
PARAMETER
High Level Output Voltage
Low Level Output Voltage
High Level Output Current
Low Level Output Current
High Level Input Voltage
Low Level Input Voltage
Input Clamp Voltage
Input Current at Maximum
Input Voltage
High Level Input Current
Low Level Input Current
Short-circuit Output Current
Output High Fan-out
Output Low Fan-out
SYMBOL
V
OH
V
OL
I
OH
I
OL
V
IH
V
IL
V
IK
I
IHH
I
IH
I
IL
I
OS
MIN
2.5
TYP
3.4
0.35
MAX
UNITS
V
V
mA
mA
V
V
V
mA
µA
mA
mA
Unit
Load
NOTES
V
CC
= MIN, I
OH
= MAX
V
IH
= MIN, V
IL
= MAX
V
CC
= MIN, I
OL
= MAX
V
IH
= MIN, V
IL
= MAX
0.5
-1.0
20.0
2.0
0.8
-1.2
0.1
20
-0.6
-150
25
12.5
V
CC
= MIN, I
I
= I
IK
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX
-60
Doc #01016
11/12/01
DATA DELAY DEVICES, INC.
Tel: 973-773-2299
Fax: 973-773-9672
http://www.datadelay.com
2
DDU37F
DELAY LINE AUTOMATED TESTING
TEST CONDITIONS
INPUT:
o
o
Ambient Temperature:
25 C
±
3 C
Supply Voltage (Vcc):
5.0V
±
0.1V
Input Pulse:
High = 3.0V
±
0.1V
Low = 0.0V
±
0.1V
Source Impedance:
50Ω Max.
Rise/Fall Time:
3.0 ns Max. (measured
between 0.6V and 2.4V )
Pulse Width:
PW
IN
= 1.5 x Total Delay
Period:
PER
IN
= 10 x Total Delay
OUTPUT:
Load:
C
load
:
Threshold:
1 FAST-TTL Gate
5pf
±
10%
1.5V (Rising & Falling)
NOTE:
The above conditions are for test only and do not in any way restrict the operation of the device.
OUT
PULSE
GENERATOR
TRIG
IN
DEVICE UNDER
TEST (DUT)
OUT
IN
TRIG
OSCILLOSCOPE
Test Setup
PER
IN
PW
IN
T
RISE
INPUT
SIGNAL
2.4
1.5
0.6
T
FALL
V
IH
2.4
1.5
0.6
V
IL
D
FALL
V
OH
D
RISE
OUTPUT
SIGNAL
1.5
1.5
V
OL
Timing Diagram For Testing
Doc #01016
11/12/01
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
3
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