data delay devices DDU18 Service Manual
data
DDU18
8-TAP, ECL-INTERFACED
3
FIXED DELAY LINE
(SERIES DDU18)
FEATURES PACKAGES
• Eight equally spaced outputs
• Fits in 400 mil 24-pin DIP socket
• Input & outputs fully 100K-ECL interfaced & buffered
FUNCTIONAL DESCRIPTION
The DDU18-series device is a 8-tap digitally buffered delay line. The
signal input (IN) is reproduced at the outputs (T1-T8), shifted in time by an
amount determined by the device dash number (See Table). For dash
numbers less than 16, the total delay of the line is measured from T1 to
T8. The nominal tap-to-tap delay increment is given by one-seventh of the
total delay, and the inherent delay from IN to T1 is nominally 2.0ns. For dash numbers greater than or
equal to 16, the total delay of the line is measured from IN to T8. The nominal tap-to-tap delay increment is
given by one-eighth of this number.
DDU18-xx DIP
DDU18-xxM Military DIP
GND
GND
GND
1
T1
3
T2
4
T3
5
6
7
T4
8
T5
9
T6
10
T7
11
T8
12
delay
devices,
IN
24
GND
19
VEE
18
GND
13
PIN DESCRIPTIONS
IN Signal Input
T1-T8 Tap Outputs
VEE -5 Volts
GND Ground
inc.
N/C
T1
T2
T3
T4
T5
T6
T7
T8
1
2
3
4
5
6
7
8
9
10
11
GND
GND
GND
DDU18-xxC4 SMD
DDU18-xxMC4 Mil SMD
IN
24
N/C
23
N/C
22
N/C
21
N/C
20
GND
19
VEE
18
N/C
17
N/C
16
N/C
15
N/C
14
GND
SERIES SPECIFICATIONS
• Minimum input pulse width: 40% of total delay
• Output rise time: 2ns typical
• Supply voltage: -5VDC ± 5%
• Power dissipation: 500mw typical (no load)
• Operating temperature: 0° to 85° C
• Temp. coefficient of total delay: 100 PPM/°C
1/7 1/7 1/7 1/7
2.0ns 1/7 1/7 1/7
VCC GNDIN T1 T2 T3 T4
Functional diagram for dash numbers < 16
1/8 1/8 1/8 1/8
1/8
VCC GNDIN T1 T2 T3 T4
Functional diagram for dash numbers >= 16
2004 Data Delay Devices
T5 T6 T7 T8
1/8 1/8 1/8
T5 T6 T7 T8
DASH NUMBER SPECIFICATIONS
Part
Number
DDU18-4
DDU18-8
DDU18-12
DDU18-16
DDU18-20
DDU18-24
DDU18-32
DDU18-40
DDU18-48
DDU18-56
DDU18-64
DDU18-72
DDU18-80
DDU18-100
DDU18-120
DDU18-160
DDU18-200
* Total delay is referenced to first tap output
Input to first tap = 2.0ns ± 1ns
NOTE: Any dash number between 4 and 200
not shown is also available.
Total
Delay (ns)
3.5 ± 1.0 * 0.5 ± 0.3
7.0 ± 1.0 * 1.0 ± 0.4
10.5 ± 1.0 * 1.5 ± 0.4
16 ± 1.0 2.0 ± 0.5
20 ± 1.0 2.5 ± 1.0
24 ± 1.2 3.0 ± 1.5
32 ± 1.6 4.0 ± 2.0
40 ± 2.0 5.0 ± 2.0
48 ± 2.4 6.0 ± 2.0
56 ± 2.8 7.0 ± 2.0
64 ± 3.2 8.0 ± 2.0
72 ± 3.6 9.0 ± 2.0
80 ± 4.0 10.0 ± 2.5
100 ± 5.0 12.5 ± 2.5
120 ± 6.0 15.0 ± 3.0
160 ± 8.0 20.0 ± 4.0
200 ± 10.0 25.0 ± 5.0
Delay Per
Tap (ns)
Doc #97041 DATA DELAY DEVICES, INC. 1
5/5/04 3 Mt. Prospect Ave. Clifton, NJ 07013
DDU18
APPLICATION NOTES
HIGH FREQUENCY RESPONSE
The DDU18 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 40% of the total delay and periods as
small as 80% 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 DDU18 relies on a stable power supply to
produce repeatable delays within the stated
tolerances. A 0.1uf capacitor from VEE to GND,
located as close as possible to the VEE pin, is
recommended. A wide VEE trace and a clean
ground plane should be used.
DEVICE SPECIFICATIONS
TABLE 1: ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL MIN MAX UNITS NOTES
DC Supply Voltage VEE -7.0 0.3 V
Input Pin Voltage VIN VEE - 0.3 0.3 V
Storage Temperature T
Lead Temperature T
STRG
300 C 10 sec
LEAD
TABLE 2: DC ELECTRICAL CHARACTERISTICS
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
High Level Output Voltage VOH -1.025 -0.880 V
Low Level Output Voltage VOL -1.810 -1.620 V
High Level Input Voltage VIH -1.165 -0.880 V
Low Level Input Voltage VIL -1.810 -1.475 V
High Level Input Current IIH 340
Low Level Input Current IIL 0.5
-55 150 C
(0C to 85C)
V
IH
V
IL
µA
µA
VIH = MAX
VIL = MIN
= MAX,50Ω to -2V
= MIN, 50Ω to -2V
Doc #97041 DATA DELAY DEVICES, INC. 2
5/5/04 Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
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