4 Channel High Input Impedance 50 Ohm TTL Line Driver

4 Channel High Input Impedance 50 Ohm TTL Line Driver

SKU:

Quantity

Item	Description
88000102-4	Cable, triple voltage, with modular plugs, Length in ft.
88000103-4	Cable, triple voltage, with modular plug and pig tail leads, Length in ft.

Product Description
Diagrams
Applications
Specifications
Documents

Applications:

Converting High Impedance TTL/CMOS Outputs to 50 Ω TTL Outputs
Long Line Drivers
High Speed Digital Communications System Testing
Basic Lab Tool
1 PPS/IRIG-B Line Driver
Hi/Lo Logic Level Generation

Features:

f_max > 70 MHz Normal/50 MHz Invert
Drives 100 ft of cable @ 50 MHz Normal
2 ns Typical Output Rise & Fall Times
Four independent, TTL-Compatible 10 kΩ Inputs
Four independent, 50 Ω TTL Outputs
BNC or SMA I/O Connectors
DC Coupled I/Os
Self-contained 1.3 x 2.9 x 2.9-in. unit includes an AC/DC adapter

Description:

The PRL-444 is a four channel TTL/CMOS input, 50 Ω output TTL/CMOS Line Driver. It is intended for interfacing with signal sources, such as digital I/O cards, that cannot drive 50 Ω loads to valid TTL levels. Each input has a 10 kΩ pulled up to 2.5 V so that it can also be driven by open-collector devices. The 50 Ω back-terminated outputs of the PRL-444 can drive long lines with or without 50 Ω load terminations. With 50 Ω load terminations, however, all outputs can drive 100 ft of 50 Ω cables at clock rates greater than 60 MHz.

If the inputs are left open, all outputs will go Hi, because the inputs are pulled up to +2.5 V. All outputs can be set to the Lo state by either setting the polarity inverting switch to the down position or terminating all inputs to 2 kΩ or lower. The polarity-inverting switch enables easy generation of four static TTL Hi/Lo logic signals when the inputs are not driven.

The PRL-444 is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/±1.4 A AC/DC Adapter. A maximum of four units can share a single AC/DC adapter using the PRL-730 voltage distribution module. If mounting is desired, a pair of the #35001420 mounting brackets can accommodate any two PRL modules of the same length. Please refer to the Accessories Section of the literature for more detail.

A block diagram showing the equivalent input and output circuits of the PRL-444 is shown in Fig. 1.

SPECIFICATIONS (0° C ≤ T_A ≤ 35° C)*

Symbol	Parameter	Min	Typ	Max	Unit	Comments
R_IN	Input Resistance	9.9	10.0	10.1	kΩ	Pulled up to +2.5 V
R_OUT	Output Resistance		50		Ω
V_IL	TTL Input Low Level	-0.5	0.0	0.5	V
V_IH	TTL Input High Level	2.0	2.4	5.0	V
V_OL	TTL Output Low Level	0.00	0.25	0.50	V	R_L=50 Ω
V_OH1	TTL Output High Level	2.2	2.5		V	R_L=50 Ω @ DC
V_OH2	TTL Output High Level	4.4	5.0		V	R_L=1 M Ω @ DC
I_DC1	DC Input Current, +8.5 V		260	300	mA	f ≤ 75 MHz
I_DC2	DC Input Current, +8.5 V		220	250	mA	f =50 MHz sq. wave⁽¹⁾
V_DC1	DC Input Voltage, +8.5 V	7.5	8.5	12	V
V_DC2	DC Input Voltage, -8.5 V		N/A		V
V_AC1	AC/DC Adapter Input Voltage, 120 VAC	103	115	127	V
V_AC2	AC/DC Adapter Input Voltage, 220 VAC	206	230	254	V
T_PLH	Propagation Delay to output ↑		15	20	ns
T_PHL	Propagation Delay to output ↓		15	20	ns
t_r	Rise Time (10%-90%)		2.2	3.0	ns	f =50 MHz sq. wave
t_f	Fall Time (10%-90%)		1.8	3.0	ns	f =50 MHz sq. wave
T_SKEW	Skew between any 2 outputs		900	1800	ps	f =50 MHz sq. wave
F_MAX1	Max. Clock Frequency, Normal Outputs	70	80		MHz	RG58C/U Cable length = 3 ft
F_MAX2	Max. Clock Frequency, Inverted Outputs	50	60		MHz	RG58C/U Cable length = 3 ft
F_MAX3	Max. Clock Frequency⁽²⁾, Normal Outputs	50	60		MHz	RG58C/U Cable length = 100 ft
PW_MIN	Min. Pulse Width		8		ns	↑ Input
PW_MIN	Min. Pulse Width		8		ns	↓ Input
	Size	1.3 x 2.9 x 2.9			in.
	Weight, excluding AC adapter	5			Oz
	Shipping weight, including AC adapter	4			lb.

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

Notes:

(1) For sharing a single PRL-760E, ± 8.5 V ±1.8 A AC/DC adapter, the total current should not exceed 1.8 A.

(2) _MAX3 is measured by connecting a second PRL-444 at the end of the 100 ft. cable.

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

PRL-444-BNC:

PRL-444-SMA: