1:10 TTL Fanout Buffer/Line Driver

SKU:

$ 1,121.25

Applications:

  • TTL/CMOS Clock Distribution
  • 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
  • Ten in-phase 50 Ω TTL Outputs
  • Active Low EN (Enable) Input
  • BNC or SMA 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-4110 is a 1:10 fanout, 50 Ω TTL Line Driver. It is intended for distribution of high-speed clock and logic signals 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-4110 can drive 100 ft of 50 Ω cables at clock rates greater than 80 MHz.

The input resistance of the PRL-4110 can be 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.

The unit 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. The unit can be disabled by driving its EN input high.

The PRL-4110 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. The two DC power jacks are bussed together internally, allowing a second PRL-4110 to be daisy-chained from a single AC adapter. Two units can share a single PRL-760B adapter provided that the clock rate is 100 MHz or slower.

A block diagram showing the equivalent input and output circuits of the PRL-4110 is shown in Fig. 1.

Related Products:

  • PRL-4220, 2:20 Fanout 50 Ω TTL Line Driver, equivalent to 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-4122, 1:22 Fanout 50 Ω TTL Line Driver, equivalent to one PRL-414B driving two PRL-4110 units in a single enclosure
PRL-4110

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter Min Typ Max Unit Comments
RIN LO Input Resistance Low Range 49.5 50 50.5
RIN HI Input Resistance High Range 9.9 10.0 10.1
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   500   mA F =50 MHz sq. wave(1)
IDC2 DC Input Current   615   mA F ≤ 100 MHz
IDC3 DC Input Current     725 mA F =125 MHz
VDC DC Input Voltages 7.75 8.50 12.00 V  
VAC AC/DC Adapter 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 f =50 MHz sq. wave
tf Fall Time (10%-90%)   1.5 2.5 ns f =50 MHz sq. wave
TSKEW Skew between any 2 outputs   500 900 ps f =50 MHz sq. wave
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 6.0 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.