2 Channel Comparator, TTL Outputs, 350 ps tr/tf


$ 1,397.25


  • Window Comparators
  • High Speed Timing
  • Line Receivers
  • Threshold Detection
  • Peak Detection


  • fmax > TBD
  • 350 ps Typical tr 
  • +50 mV, 0 V or -50 mV Preset Input Threshold Voltage
  • -2.0 V to +3.0 V Input Common Mode Range
  • 10 mVPP Minimum Input @ 300 MHz.
  • DC Coupled 50 Ω Inputs
  • Complementary TTL Outputs
  • SMA I/O Connectors
  • Self-contained unit includes AC/DC Adapters


The PRL-350ATTL is a variant of the standard PRL-350TTL, with the output transistors swapped out for much faster rise/fall times of ~350 ps vs the ~1.1 ns tr/tf of the standard PRL-350TTL.

In addition to the faster rise and fall times, this also enables the PRL-350ATTL to pass pulses as narrow as < 2 ns, vs. the ~4 ns minimum pulse width of the PRL-350TTL.

Power consumption is higher than for the PRL-350TTL.

In all other respects the PRL-350ATTL behaves like a standard PRL-350TTL with respect to triggering, output voltages, etc. 

Full characterization and a datasheet are coming soon. 

Fig. 1B PRL-350ATTL Block Diagram

For the PRL-350TTL, very slight output waveform distortion and rise time degradation will occur when an unused complementary output is not terminated. 

For optimum performance, however, all outputs should be terminated./p>


(0° C ≤ TA ≤ 35° C)*

Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω.

Symbol Parameter PRL-350TTL Unit
Min Typ Max
RIN Input Resistance 49.5 50 50.5 Ω
ROUT Output Resistance 49.5 50 50.5 Ω
VTH+ Preset positive threshold voltage 45 50 55 mV
VTH- Preset negative threshold voltage -55 -50 -45 mV
VTH0 Preset zero threshold voltage(1) -2 0 2 mV
VOL Output Low Level -0.5 0 0.5 V
VOH Output High Level 2.0 2.2 2.4 V
IDC1 DC Input Current, +8.5 V 340
IDC2 DC Input Current, -8.5 V -440
VDC1 DC Input Voltage, +8.5 V 7.5 8.5 12.0 V
VDC2 DC Input Voltage, -8.5 V -12.0 -8.5 -7.5 V
VAC1 AC/DC Adapter Input Voltage, 120 VAC 103 115 127 V
VAC2 AC/DC Adapter Input Voltage, 220 VAC 206 230 254 V
tPLH Propagation Delay to output↑ 2 ns
tPHL Propagation Delay to output↓ 2 ns
tr/tf Rise/Fall Times, 10% - 90% 350
tSKEW Skew between any 2 outputs 350
Vin I Minimum Input Voltage @ 150 MHz(2) 20 10 mVPP
Vin II Minimum Input Voltage @ 250 MHz(2) 40 20 mVPP
VCM Input Common Mode Range -2.0 +3.0 V
fmax Max. Clock Frequency TBD MHz
Size 1.3 x 2.9 x 3.9 in.
Weight, w/o AC adapter 7 Oz
Shipping weight, w/AC adapter 3 lb

(1) If the switch is set to the center position (0 V threshold) a non-driven channel will oscillate and induce jitter in the driven channel. Connect any output to any input to stop the oscillation.

For the PRL-350ATTL, very slight output waveform distortion and rise time degradation will occur when an unused complementary output is not terminated. For optimum performance, however, all outputs should be terminated.

(2) In order to reduce jitter near fMAX, terminate the non-driven input into 50 Ω when the input voltage is less than 20 mVPP.

While we believe these models to be accurate, no representations are made as to accuracy or suitability for any application: