2:20 TTL Fanout Buffer/Line Driver

SKU:

$ 2,070.00

Applications:

  • TTL/CMOS Clock Distribution
  • 2 x 1:10 Fanout Line Driver
  • High Speed Digital Communications System Testing
  • 1 PPS Distribution/IRIG-B Distribution
  • Mini Modular Instrument

Features:

  • fMAX > 100 MHz
  • Drives 100 ft of cable @ 80 MHz
  • 1.8 ns Typical Output Rise & Fall Times
  • 2.5 V into 50 Ω Typical
  • TTL Compatible 50 Ω or 10 kΩ Input
  • 20 in-phase 50 Ω TTL Outputs (two sets of 10)
  • Active Low EN (Enable) Input
  • BNC I/O Connectors
  • DC Coupled I/Os
  • Self-contained 3.0 x 6.8 x 4.0-in. unit includes an AC/DC Adapter

Description

The PRL-4220 is a 2 x 1:10 fanout 50 Ω TTL Line Driver. It is intended for distribution of two independent high-speed clock and logic signals (e.g. CLK and DATA) to multiple loads via long lines. The 50 Ω back-terminated outputs can drive long lines with or without 50 Ω load terminations. With 50 Ω load terminations, however, all outputs of the PRL-4220 can drive 100 ft of 50 Ω cables at clock rates greater than 80 MHz. The PRL-4220 is implemented as two separate, independent 1:10 fanout buffers on two PCBs in a single enclosure.

The input resistance of each 1:10 fanout board can be independently selected to be either 50 Ω or 10 kΩ by a switch. The 10 kΩ-input is desirable when interfacing with low power circuits. The 50 Ω back terminated outputs typically deliver 2.5 V into 50 Ω or 5.0 V into Hi-Z loads. All I/Os are DC coupled and have BNC or SMA connectors.

Each board also has a TTL-compatible EN input pulled down via a 1 kΩ resistor. When left open the Enable is active, and the fanout buffer will output signals. Each board can be disabled by driving its EN input high.

The PRL-4220 is housed in a 3.0 x 6.8 x 4.0-in. extruded aluminum enclosure and is supplied with the PRL-760C, ±8.5 V/±1.8 A AC/DC Adapter.

A block diagram showing the equivalent input and output circuits of the PRL-4220 is shown in Fig. 1.

Related Products:

  • PRL-4110, 1:10 Fanout 50 Ω TTL Line Driver
  • PRL-4122, 1:22 Fanout 50 Ω TTL Line Driver, equivalent to one PRL-414B driving two PRL-4110 units in a single enclosure
  • PRL-4330, 3:30 Fanout 50 Ω TTL Line Driver, equivalent to three PRL-4110 units in a single enclosure
PRL-4220

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter Min Typ Max Unit Comments
RIN Low Input Resistance Low Range 49.5 50.0 50.5  
RIN Hi Input Resistance High Range 9.9 10.0 10.1 kΩ  
RIN EN Input Resistance, Enable   1   kΩ  
ROUT Output Resistance   50    
VIL TTL Input Low Level -0.5 0.0 0.5 V  
VIH TTL Input High Level 2.0 2.4 5.0 V  
VIL EN EN Input Low Level -0.5 0.0 0.5 V  
VIH EN EN Input High Level 2.0 2.4 5.0 V Drive EN High to disable output
VOL TTL Output Low Level 0.0 0.25 0.5 V RL=50 Ω
VOH1 TTL Output High Level 2.2 2.5   V RL=50 Ω @ DC
VOH2 TTL Output High Level 4.4 5.0   V RL=1 MΩ @ DC
IDC1 DC Input Current   1000   mA F =50 MHz sq. wave(1)
IDC2 DC Input Current   1230   mA F ≤ 100 MHz
IDC3 DC Input Current     1450 mA F =125 MHz
VDC DC Input Voltages 7.75 8.50 12.00 V  
VAC AC/DC Adaptor Input Voltage 103 115 127 V  
TPLH Propagation Delay to output ↑   9 12 ns  
TPHL Propagation Delay to output ↓   9 12 ns  
tr Rise Time (10%-90%)   1.8 2.5 ns  
tf Fall Time (10%-90%)   1.5 2.5 ns  
TSKEW1 Skew between any 2 outputs   500 900 ps Within one 1:10 bank
TSKEW2 Skew between any 2 outputs   1000 1400 ps Any two outputs
FMAX1 Max. Clock Frequency(2) 100 125   MHz RG58C/U, cable length =3 ft
FMAX2 Max. Clock Frequency(3)   80     RG58C/U, cable length = 100 ft
PWMIN1 Minimum Pulse Width   4   ns ↑ Input
PWMIN2 Minimum Pulse Width   6   ns ↓ Input
  Size 3.0 x 6.8 x 4.0 in  
  Weight 1.5 lb Excluding AC adapter
  Shipping Weight 1.5 lb Including AC adapter
Notes:
  1. fMAX should not exceed 125 MHz, otherwise damage of the unit due to overheating may result.
  2. fMAX2 is measured by driving a second PRL-4110 at the end of a 100 ft cable.
  3. For sharing a single PRL-760C, ±8.5 V, ±1.8 A AC/DC adapter, the total current should not exceed 1.8 A.