Quad Differential Receivers
BRF1A, BRF2A, BRS2B, BRR1A, and BRT1A
Data Sheet
April 2001
Timing Characteristics (continued)
INPUT
INPUT
3.7 V
3.2 V
2.7 V
tPLH
tPHL
OUTPUT
80%
VOH
80%
1.5 V
20%
20%
VOL
ttHL
ttLH
12-2251.b(F)
Figure 4. Receiver Propagation Delay Timing
3 V
E1*
E2†
1.5 V
0 V
3 V
1.5 V
0 V
tPHZ
tPZH
tPLZ
tPZL
V
OH
OUTPUT
∆
V = 0.5 V
V
OL
∆
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.
5 V
2 kΩ
TO OUTPUT OF
DEVICE UNDER
TEST
CL
15 pF*
5 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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