PULSE GENERATOR MODULES

SSFRPG-TTL-XXX

Space Saver FAST TTL Fast Recovery Pulse Generator

- T²L input and output
- Pulse widths stable and precise
- High output duty cycles
- 8-pin Space Saver package
- Leads - thru-hole, J, Gull Wing or Tucked
- Available in pulse widths from 10 to 500ns
- 10 Schottky T²L fan-out capacity

DESIGN NOTES

The "Space Saver Series" Pulse Generator Modules developed by Engineered Components Company have been designed to provide precise output pulse widths when triggered by variable width inputs. All required driving and output circuitry, as well as timing components, are contained in an 8-pin package. These pulse generator modules 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. These modules are compatible with FAST and Schottky T²L circuits and require no external components in order to obtain the specified output pulse.

The SSFRPG-TTL is offered in 33 pulse widths from 10 to 500ns. These modules provide a stable T²L output pulse of the specified width for each positive input step. The generated pulse is inverted internally to provide a negative pulse as an additional output. It is necessary only that the input be held low for at least 10ns, then high for at least 10ns to obtain the desired output pulse. The duration of the positive input pulse, after this time, has no effect on the output pulse width. No output pulse will occur on the input falling edge transition. Pulse width tolerance is maintained as shown in the accompanying Part Number Table, when tested under the "Test Conditions" shown. Pulse width is measured at the +1.5V level on both leading and trailing edge. Rise and fall times are less than 4ns, when measured from 0.8V to 2.0V. These modules are capable of driving 10 Schottky T²L loads. Temperature coefficient of pulse width for the majority of this product line is approximately ±100 ppm/°C over the operatin g temperature range of 0 to +70°C.

These "Space Saver Series" modules are packaged in an 8-pin housing, molded of flame-proof Diallyl Phthalate per ASTM D 5948, Type SDG-F, and are fully encapsulated in epoxy resin. Thru-hole, J, Gull Wing or Tucked Lead configurations are available on these modules (see Part Number Table note to specify). Leads meet the solderability requirements of MIL-STD-202, Method 208. Corner standoffs on the housing of the thru-hole lead version and lead design of the surface mount versions provide positive standoff from the printed circuit board to permit solder-fillet formation and flush cleaning of solder-flux residues for improved reliability.

Marking consists of manufacturer's name, logo (EC²), part number, terminal 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 Schottky toggle-type positive input pulse and one Schottky T²L load at the output.
4. Input pulse width used is 10ns for all modules; repetition rate is approximately 200 KHz.

OPERATING SPECIFICATIONS

*Vcc supply voltage:........... 4.75 to 5.25V DC 
Vcc supply current:
   Constant "0" in............. 40mA typical
   Constant "1" in............. 40mA typical 
Logic 1 Input:
   Voltage .................... 2V min.; Vcc max.
   Current .................... 2.7V = 20uA max.
                           @ max. V in = 100uA max.
Logic 0 Input:
   Voltage..................... 0.8V max.
   Current..................... -2mA max. 
Logic 1 Voltage out:........... 2.5V min.
Logic 0 Voltage out:........... 0.5V max.
Operating temperature range:... 0 to +70°C.
Storage temperature:........... -55 to +125°C.

*Pulse width increases or decreases approximately 1% for a respective decrease or increase of 5% in supply voltage.

PART NUMBER TABLE

*Suffix Part Number with G (for Gull Wing Lead), J (for J Lead), F (for Thru-hole Lead) or T (for Tucked Lead).
Examples: SSFRPG-TTL-10G (Gull Wing), SSFRPG-TTL-25J (J Lead), SSFRPG-TTL-75F (Thru-hole Lead) or SSFRPG-TTL-12T (Tucked Lead).

All modules can be operated up to the maximum pulse rate specified in the Part Number Table with pulse widths as low as 10ns and pulse spacing as low as 10ns. Since pulse width accuracies may be somewhat degraded at high pulse rates, it is suggested that the module be evaluated under the specific operating conditions.

Special modules can be readily manufactured to improve accuracies and/or provide customer specified non-standard pulse widths for specific applications.