LOGIC DELAY MODULES
 SMFLDM-TTL-XX
Surface Mount
FAST TTL Logic Delay Module
- T²L FAST input and outputs
- Delays stable and precise
- SO-14 pin pattern
- Wee DIP package (.235 high)
- Available in delays from 10 to 250ns -- each isolated and with 10 T²L fan-outcapacity
- Fast rise times on all outputs
DESIGN NOTES
The "Wee DIP Series" Logic Delay Modules developed by Engineered Components Company have been designed to provide precise tapped delays with required driving and pick-off circuitry contained in a single SO-14 pin surface mount package compatible with FAST T²L circuits. These logic delay lines are of hybrid construction utilizing the proven technologies of active integrated circuitry and of passive networks utilizing capacitive, inductive and resistive elements. The MTBF on these modules, when calculated per MIL-HDBK-217 for a 50° C ground fixed environment, is in excess of 3 million hours. Module design includes compensation for propagation delays and incorporates internal termination at the output. No additional external components are needed to obtain the desired delay.
The SMFLDM-TTL is offered in twenty-eight (28) delays from 10ns to 250ns with each module incorporating taps as shown in the part number table. Delay tolerances are maintained, as shown in the accompanying part number table, when tested under the "Test Conditions" shown. Delay time is measured at the +1.5V level on the leading edge. Rise time for all modules is 4ns maximum, when measured from0.75V to 2.4V. Temperature coefficient of delay is approximately +500 ppm/°C over the operating temparture range of 0 to +70°C.
These modules accept either logic "1" or logic "0" inputs and reproduce the logic at the selected output tap without inversion. The delay modules are intended primarily for use with positive going pulses and are calibrated to the tolerances shown in the table on rising edge delay; where best accuracy is desired in applications using falling edge timing, it is recommended that a special unit be calibrated for the specific application. Each module has the capability of driving up to 20 T²L loads with a maximum of 10 loads on any one tap.
The "Wee DIP
Series" modules are packaged in a SO-14 DIP housing, molded
of flame-proof Diallyl Phthalate per ASTM D 5948, Type SDG-F,
and are fully encapsulated in epoxy resin. Leads meet the
solderability requirements of MIL-STD-202, Method 208.
Marking consists
of manufacturer's logo (EC²), part number, pin one
(1) identification and date code of manufacture. All marking
is applied by silk screen process using white epoxy paint
in accordance with MIL-STD-130, to meet the permanency of
identification required by MIL-STD-202, Method 215.
TEST CONDITIONS
1. All measurements are made at 25°C.
2. Vcc supply voltage is maintained at 5.0V DC.
3. All units are tested using a FAST toggle-type positive input pulse and one FAST T²L load at the output being tested.
4. Input pulse width used is 5 to 10ns longer than full delay of module under test; spacing between pulses (falling edge to rising edge) is three times the pulse width used.
OPERATING SPECIFICATIONS
*Vcc supply voltage: ........... 4.75 to 5.25V DC
Vcc supply current:
Constant "0" in ............. 40mA typical
Constant "1" in ............. 7mA typical
Logic 1 Input:
Voltage ..................... 2V min.; Vcc max.
Current ..................... 2.7V = 20uA max.
5.5V = 1mA max.
Logic 0 Input:
Voltage ..................... 0.8V max.
Current ..................... -.6mA max.
Logic 1 Voltage out: ........... 2.7V min.
Logic 0 Voltage out: ........... 0.5V max.
Operating temperature range: ... 0 to 70°C.
Storage temperature: ........... -55 to +125°C.
|
*Delays increase or decrease approximately 2% for a respective increase or decrease of 5% in supply voltage.
PART NUMBER TABLE
DELAYS
AND TOLERANCES (in ns)
| Part Number |
Tap 1 |
Tap2 |
Tap3 |
Tap4 |
Output |
SMFLDM-TTL-10
SMFLDM-TTL-12
SMFLDM-TTL-14
SMFLDM-TTL-16
SMFLDM-TTL-18
SMFLDM-TTL-22
SMFLDM-TTL-25
SMFLDM-TTL-30
SMFLDM-TTL-35
SMFLDM-TTL-40
SMFLDM-TTL-45
SMFLDM-TTL-50
SMFLDM-TTL-55
SMFLDM-TTL-60
SMFLDM-TTL-65
SMFLDM-TTL-70
SMFLDM-TTL-75
SMFLDM-TTL-80
SMFLDM-TTL-85
SMFLDM-TTL-90
SMFLDM-TTL-95
SMFLDM-TTL-100
SMFLDM-TTL-125
SMFLDM-TTL-150
SMFLDM-TTL-175
SMFLDM-TTL-200
SMFLDM-TTL-225
SMFLDM-TTL-250 |
6 ±1
6 ±1
6 ±1
6 ±1
6 ±1
6 ±1
5 ±1
6 ±1
7 ±1
8 ±1
9 ±1
10 ±1
11 ±1
12 ±1
13 ±1
14 ±1
15 ±1
16 ±1
17 ±1
18 ±1
19 ±1
20 ±1
25 ±1
30 ±1.5
35 ±1.5
40 ±1.5
45 ±2
50 ±2 |
7 ±1
7.5 ±1
8 ±1
8.5 ±1
9 ±1
10 ±1
10 ±1
12 ±1
14 ±1
16 ±1
18 ±1
20 ±1
22 ±1
24 ±1
26 ±1.5
28 ±1.5
30 ±1.5
32 ±1.5
34 ±1.5
36 ±1.5
38 ±1.5
40 ±1.5
50 ±2
60 ±2
70 ±2.5
80 ±2.5
90 ±3
100 ±3 |
8 ±1
9 ±1
10 ±1
11 ±1
12 ±1
14 ±1
15 ±1
18 ±1
21 ±1
24 ±1.5
27 ±1
30 ±1
33 ±1.5
36 ±1.5
39 ±1.5
42 ±2
45 ±2
48 ±2
51 ±2
54 ±2
57 ±2
60 ±2
75 ±2.5
90 ±3
105 ±4
120 ±4
135 ±4
150 ±4.5 |
9 ±1
10.5 ±1
12 ±1
13.5 ±1
15 ±1
18 ±1
20 ±1
24 ±1
28 ±1.5
32 ±1.5
36 ±1.5
40 ±2
44 ±2
48 ±2
52 ±2
56 ±2
60 ±2.5
64 ±2.5
68 ±2.5
72 ±2.5
76 ±2.5
80 ±3
100 ±3
120 ±4
140 ±5
160 ±5
180 ±6
200 ±6 |
10 ±1
12 ±1
14 ±1
16 ±1
18 ±1
22 ±1
25 ±1
30 ±1
35 ±1.5
40 ±1.5
45 ±2
50 ±2
55 ±2
60 ±2
65 ±2.5
70 ±2.5
75 ±2.5
80 ±3
85 ±3
90 ±3
95 ±3
100 ±3
125 ±7
150 ±5
175 ±5
200 ±6
225 ±7
250 ±8 |
All modules can be operated
with a minimum input pulse width of 40% of full delay and
pulse period approaching square wave; since delay accuracies
may be somewhat degraded, it is suggested that the module
be evaluated under the intended specific operating conditions.
Special modules
can be readily manufactured to improve accuracies and/or
provide customer specified random delay times for specific
applications.
| 
