The PRL-420RS is a dual channel line driver and level translator. It has a single-ended TTL input and differential 124 Ω RS-422 outputs. Each channel has a 50 Ω TTL/CMOS compatible input and a pair of differential 124 Ω outputs for driving long lines, in excess of 100 ft, terminated into differential 124 Ω loads. The input threshold voltage can be selected between 1.5 V and 1.0 V using a front panel switch. The 1.0 V threshold makes it easy to interface with 3.3V TTL/CMOS devices.
The PRL-420RS outputs are designed to interface with the 124 Ω differential Serial Data/Data or Clock/Clock inputs of the data communications equipment and also for use in testing and interfacing of high speed digital communication circuits. The PRL-420RS complements other PRL-series Level Translators, such as the PRL-420ND/PD, PRL-450ND/PD, and PRL-460NPD/PND, etc., in system integration applications where interconnections among different logic signals are often necessary.
The PRL-420RS is a ready-to-use functional module housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure and is supplied with a ±8.5 VAC/DC Adapter. BNC input and SMA output connectors are provided for the PRL-420RS model, Triax output connectors for the PRL-420RSTR model, and SMA I/Os for the PRL-420RS-SMA model. A block diagram showing the equivalent input and output circuits are shown in Figs. 1A and 1B.
(0° C ≤ TA ≤ 35° C)*
|ROUT||Differential Output Resistance||122.6||124||125.3||Ω|
|VTOSH||Input Threshold Voltage (high)||1.4||1.5||1.6||V|
|VTOSL||Input Threshold Voltage (low)||0.9||1.0||1.1||V|
|VIL||TTL input Low Level||-0.5||0||0.5||V|
|VOL||RS-422 Output Low Level||-0.05||0.0||0.2||V||Diff.124 Ω load|
|VOH||RS-422 Output High Level||2.3||2.5||V||Diff.124 Ω load|
|IDC1||DC Input Currents, +8.5 V||185||200||mA|
|IDC2||DC Input Currents, -8.5 V||-255||-275||mA|
|VDC||DC Input Voltages||±7.5||±8.5||±12||V|
|VAC||AC/DC Adapter Input Voltage||103||115||127||V|
|TPLH||Propagation Delay to output ↑||2||ns|
|TPHL||Propagation Delay to output ↓||2||ns|
|tr/tf||Rise/Fall Times (10%-90%)||1.2||1.4||ns||Note (1)|
|TSKEW||Skew between any 2 outputs||150||400||ps|
|fmax||Max Clock Frequency||250||300||MHz|
|Size||1.3 x 2.9 x 3.9||in.|
|Weight, excluding AC adapter||5||Oz|
|Shipping Weight, including AC adapter||4||lb|