DDU18
8-TAP, ECL-INTERFACED FIXED DELAY LINE (SERIES DDU18)
data 3 ® delay
devices, inc.
FEATURES |
PACKAGES |
∙Eight equally spaced outputs
∙Fits in 400 mil 24-pin DIP socket
∙Input & outputs fully 100K-ECL interfaced & buffered
DDU18-xx DIP
DDU18-xxM Military DIP
GND |
1 |
24 |
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IN |
GND |
1 |
24 |
IN |
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N/C |
2 |
23 |
N/C |
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T1 |
3 |
22 |
N/C |
T1 |
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3 |
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T2 |
4 |
21 |
N/C |
T2 |
4 |
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T3 |
5 |
20 |
N/C |
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T3 |
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5 |
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GND |
6 |
19 |
GND |
GND |
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6 |
19 |
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GND |
GND |
7 |
18 |
VEE |
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T4 |
8 |
17 |
N/C |
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GND |
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7 |
18 |
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VEE |
T5 |
9 |
16 |
N/C |
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T4 |
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8 |
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T6 |
10 |
15 |
N/C |
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T7 |
11 |
14 |
N/C |
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T5 |
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9 |
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T8 |
12 |
13 |
T10 |
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T6 |
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10 |
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DDU18-xxC3 |
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SMD |
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T7 |
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11 |
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T8 |
12 |
13 |
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GND |
DDU18-xxMC3 |
Mil SMD |
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FUNCTIONAL DESCRIPTION |
PIN DESCRIPTIONS |
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The DDU18-series device is a 8-tap digitally buffered delay line. The |
IN |
Signal Input |
signal input (IN) is reproduced at the outputs (T1-T8), shifted in time by an |
T1-T8 |
Tap Outputs |
amount determined by the device dash number (See Table). For dash |
VEE |
-5 Volts |
numbers less than 16, the total delay of the line is measured from T1 to |
GND |
Ground |
T8. The nominal tap-to-tap delay increment is given by one-seventh of |
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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.
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
2.0ns 1/7 1/7 1/7 1/7 1/7 1/7 1/7
VCC IN |
T1 |
T2 |
T3 |
T4 |
T5 |
T6 |
T7 T8 GND |
Functional diagram for dash numbers < 16
1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8
DASH NUMBER SPECIFICATIONS
Part |
Total |
Delay Per |
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Number |
Delay (ns) |
Tap (ns) |
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DDU18-4 |
3.5 ± 1.0 * |
0.5 ± 0.3 |
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DDU18-8 |
7.0 ± 1.0 * |
1.0 ± 0.4 |
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DDU18-12 |
10.5 ± 1.0 * |
1.5 ± 0.4 |
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DDU18-16 |
16 |
± 1.0 |
2.0 ± 0.5 |
DDU18-20 |
20 |
± 1.0 |
2.5 ± 1.0 |
DDU18-24 |
24 |
± 1.2 |
3.0 ± 1.5 |
DDU18-32 |
32 |
± 1.6 |
4.0 ± 2.0 |
DDU18-40 |
40 |
± 2.0 |
5.0 ± 2.0 |
DDU18-48 |
48 |
± 2.4 |
6.0 ± 2.0 |
DDU18-56 |
56 |
± 2.8 |
7.0 ± 2.0 |
DDU18-64 |
64 |
± 3.2 |
8.0 ± 2.0 |
DDU18-72 |
72 |
± 3.6 |
9.0 ± 2.0 |
DDU18-80 |
80 |
± 4.0 |
10.0 ± 2.5 |
DDU18-100 |
100 ± 5.0 |
12.5 ± 2.5 |
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DDU18-120 |
120 ± 6.0 |
15.0 ± 3.0 |
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DDU18-160 |
160 ± 8.0 |
20.0 ± 4.0 |
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DDU18-200 |
200 |
± 10.0 |
25.0 ± 5.0 |
VCC IN T1 |
T2 |
T3 |
T4 |
T5 |
T6 |
T7 T8 GND |
Functional diagram for dash numbers >= 16
*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.
©1997 Data Delay Devices
Doc #97041 |
DATA DELAY DEVICES, INC. |
1 |
12/12/97 |
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 |
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Input Pin Voltage |
VIN |
VEE - 0.3 |
0.3 |
V |
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Storage Temperature |
TSTRG |
-55 |
150 |
C |
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Lead Temperature |
TLEAD |
|
300 |
C |
10 sec |
TABLE 2: DC ELECTRICAL CHARACTERISTICS
(0C to 85C)
PARAMETER |
SYMBOL |
MIN |
TYP |
MAX |
UNITS |
NOTES |
High Level Output Voltage |
VOH |
-1.025 |
|
-0.880 |
V |
VIH = MAX,50Ω to -2V |
Low Level Output Voltage |
VOL |
-1.810 |
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-1.620 |
V |
VIL = MIN, 50Ω to -2V |
High Level Input Voltage |
VIH |
-1.165 |
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-0.880 |
V |
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Low Level Input Voltage |
VIL |
-1.810 |
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-1.475 |
V |
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High Level Input Current |
IIH |
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340 |
μA |
VIH = MAX |
Low Level Input Current |
IIL |
0.5 |
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μA |
VIL = MIN |
Doc #97041 |
DATA DELAY DEVICES, INC. |
2 |
12/12/97 |
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com |