Data Sheet
April 2001
Quad Differential Receivers
BRF1A, BRF2A, BRS2B, BRR1A, and BRT1A
Timing Characteristics
(continued)
INPUT
INPUT
3.7 V
3.2 V
2.7 V
t
PHL
OUTPUT
80%
20%
t
tHL
20%
t
PLH
80%
V
OH
1.5 V
V
OL
t
tLH
12-2251.b(F)
Figure 4. Receiver Propagation Delay Timing
3V
E1*
1.5 V
0V
3V
E2
†
1.5 V
0V
t
PHZ
t
PZH
t
PLZ
t
PZL
V
OH
OUTPUT
V
OL
∆V
= 0.5 V
∆V
= 0.5 V
∆V
= 0.5 V
∆V
= 0.5 V
12-253.b(F)
* E2 = 1 while E1 changes state.
† E1 = 0 while E2 changes state.
Figure 5. Receiver Enable and Disable Timing
Test Conditions
Parametric values specified under the Electrical Characteristics and Timing Characteristics sections for the data
transmission driver devices are measured with the following output load circuits.
5V
TO OUTPUT OF
DEVICE UNDER
TEST
C
L
15 pF*
5 kΩ
2 kΩ
12-2249(F)
* Includes probe and jig capacitances.
Note: All 458E, IN4148, or equivalent diodes.
Figure 6. Receiver Propagation Delay Test Circuit
Agere Systems Inc.
5
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