Agere Systems Inc.

3

Data Sheet

April 2001

BRF1A, BRF2A, BRS2B, BRR1A, and BRT1A

Quad Differential Receivers

Table 3. Voltage and Current Characteristics

12-2819.a(F)

Figure 2. BRT1A Terminating Resistor Configuration

Parameter

Sym

Min

Typ

Max

Unit

——

0.5

V

−400 µA

2.4

—

—

V

Enable Input Voltages:

1. The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.

——

0.7

V

2.0

—

—

V

——

–1.0

V

2. Outputs of unused receivers assume a logic 1 level when the inputs are left open. (It is recommended that all unused positive inputs

be tied to the positive power supply. No external series resistor is required.)

—0.1

0.20

V

Input Offset Voltage



0.02

0.05

V

Input Offset Voltage BRS2B



0.1

0.15

V

——

–20

µA

——

20

µA

Short Circuit

3. Test must be performed one lead at a time to prevent damage to the device.

–25

—

–100

mA

—

—

–400

µA

——

20

µA

——

100

µA

——

−1.0

mA

——

1.0

mA

Differential Input Impedance (BRR1A):

Connected Between RI and RI

—

110

—

Ω

4. See Figure 2.

—60—

Ω

—90—

Ω

RI

R1

R1

R2

RI