Yes, that really is LVTTL output at a Gigahertz Transitions!
The NEW P1TTL has Dual polarity outputs

REVISED P1TTL

The P1TTL and P2TTL provide Gigahertz rise-time fixed width TTL output capability to the PV16.  This function is commonly referred to as a one-shot or a monostable multivibrator. 

The P1TTL is primarily intended to produce very high repetition rate single photon LVTTL outputs from the PV16 with a minimum pulse width of 404 picoseconds and maximum repetion of 600 MHz*
Vpp  = 2.18V

The P2TTL is a dual output polarity Reduced LVTTL one-shot with 124 picosecond rise time and 149 picosecond fall time at 800 mV PP and a minimum pulse width of 1.45 nanoseconds. 
The P2TTL has a fixed 500 picosecond reset time whereas the P1TTL has a reset time equal to the selected pulse width.  Please see the first page for a white paper on the TTL one-shots.


*Input from Colby PECL pulser with 142 picoseconds rise-time and 155 picosecondsinto 50 ohm load 8 GHz tektronix oscilloscope with 20% to 80% measuring levels.
Some specifications have changed due to unavailability of chips due to company mergers.

Converting the sub-nanosecond PV16 output to a LVTTL pulse may be necessary for compatibility with older devices which were not designed to count faster than 10 to 100 Megahertz.  In some cases it is necessary to make the output pulse width compatible with a digital sample rate.

The middle trace in the oscilloscope picture is the input from a PV16 pulse, and the top and  bottom traces are the absolute minimum pulse width from the P2TTL box.

SPECIFICATIONS
1.26" cube same size as PV16
6V @ 153 ma External Supply
Single input and LVTTL outputThreshold adjustment for + or - Input
An external GHz inverting transformer is available for convenience..

Prices start at $200 depending on the fixed width or adjustable width internal parts.
$250.00 for 650 ps to 1.05 ns for the P1TTL
$250.00 for 6.3 ns fixed pulse width output or 1.4 ns to 5 ns