4-Decade TTL Freq. Divider (f/10 - f/10000)


$ 517.50


  • Count down signal for oscilloscope trigger
  • Laser synchronization
  • Applications requiring very large division ratios
  • Counter Output simulation
  • Square Wave Generator (except f/10 output)
  • An Essential Lab Tool for Working with TTL/CMOS Circuits


  • 100 MHz Maximum Toggle Frequency
  • 50 Ω Outputs deliver > 2.2 V into 50 Ω loads
  • TTL/CMOS Compatible Input Levels
  • 50 Ω or 500 Ω Input Resistance
  • BNC or SMA I/O Connectors
  • Ready-to-Use 1.3 x 2.9 x 2.9-in. Module includes AC/DC Adapter


The PRL-230 is a four-decade TTL frequency divider capable of operating at clock frequencies in excess of 100 MHz. It has ÷10, ÷100, ÷1000 and ÷10,000 division ratios with 50 Ω outputs, each capable of delivering greater than 2.2 V into a 50 Ω load. Except for the ÷10 channel, all others have square wave outputs (50% duty cycle). For the ÷10 channel, the output pulse width is equal to the period (1/f) of the input signal. The PRL-230 is ideally suited for applications that require very large division ratios, and the square wave outputs are useful for testing High-pass and Low-pass filters. When used together with the PRL-260BNT programmable frequency divider, they can generate divided signals from 1.2 GHz down to 29 Hz. Multiple units can be cascaded for even further division.

The input resistance of the PRL-230 can be set to 500 Ω or 50 Ω by a toggle switch. The back-matched 50 Ω outputs of this frequency divider can drive long lines with or without 50 Ω terminations. A functional block diagram of the unit is shown in Fig. 1.

The PRL-230 is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure. The PRL-230-BNC has BNC I/O connectors, and the PRL-230-SMA has SMA I/O connectors. A ±8.5 V AC/DC adapter is included.

If mounting is desired, a pair of 35001420 mounting brackets can accommodate two PRL modules of the same length. A number of PRL modules can also share a single ±8.5 V AC/DC adaptor using the PRL-730 voltage distribution module. Please see the Accessories Section for more detail.

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter Min Typ Max Unit Comments
RIN1 Input Resistance, 50 Ω 49.5 50.0 50.5 Ω
RIN2 Input Resistance, 500 Ω 495 500 505 Ω
IDC DC Input Current 175 200 mA
VDC DC Input Voltage 7.5 8.5 12 V
VAC AC/DC Adapter Input Voltage 103 115 127 V
VIH Input Hi Level 2.0 2.2 5.0 V
VIL Input Lo Level -0.5 0.0 0.5 V
VOHNL Output Hi Level, No load 4.8 5.0 V RL=1 MΩ
VOHFL Output Hi Level, Full load 2.2 2.5 V RL=50 Ω
VOLNL Output Lo Level, No load 0.30 0.50 V RL=1 MΩ
VOLFL Output Lo Level, Full load 0.15 0.25 V RL=50 Ω
TPLH/TPHL Propagation Delay to f/10 output 4 8 ns
TPLH/TPHL Propagation Delay to f/100 output 15 30 ns
TPLH/TPHL Propagation Delay to f/1k output 30 ns
TPLH/TPHL Propagation Delay to f/10k output 60 ns
tr Rise Time (10%-90%) 2.0 3.0 ns
tf Fall Time (10%-90%) 1.8 3.0 ns
fMAX Max clock frequency 100 125 MHz RIN = 50 Ω
Size 1.3 x 2.9 x 2.9 in.
Weight 5 oz.
Shipping weight, incl. AC adapter 4 lb.