am79c981 Advanced Micro Devices, am79c981 Datasheet - Page 26

• Manufacturer Part Number: am79c981
• Description: Integrated Multiport Repeater Plus? Imr+? ??9
• Manufacturer: Advanced Micro Devices

DC CHARACTERISTICS (continued)
1–96
Parameter
Twisted Pair Ports
Power Supply Current
Symbol
V
V
V
V
V
V
R
V
V
R
R
I
V
V
RXDTH
V
TXOFF
IRXD
TSQ+
I
AMD
THS+
TSQ-
THS-
TIVB
RXD
TXH
TXD
DD
TXL
TXP
TID
TXI
Parameter Description
Input current at RXD+/-
RXD differential input resistance
RXD+,RXD- open circuit input
voltage (bias)
Differential Mode input voltage
range (RXD)
RXD positive squelch threshold
(peak)
RXD negative squelch threshold
(peak)
RXD post-squelch positive threshold
(peak)
RXD post-squelch negative threshold
(peak)
RXD switching threshold
TXD+/- and TXP+/- output
HIGH voltage
TXD+/- and TXP+/- output
LOW voltage
TXD+/- and TXP+/- differential
output voltage imbalance
TXD+/- and TXP+/- differential
idle output voltage
TXD+/- differential driver
output impedance
TXP+/- differential driver
output impedance
Power supply current (idle)
Power supply current (transmitting
– no TP load)
Power supply current (transmitting
– with TP load)
PRELIMINARY
Am79C981
Test Conditions
AV
(Note 1)
I
AV
Sinusoid 5 MHz <f< 10 MHz
Sinusoid 5 MHz <f< 10 MHz
Sinusoid 5 MHz <f< 10 MHz
Sinusoid 5 MHz <f< 10 MHz
(Note 1)
DV
(Note 2)
DV
(Note 2)
DV
(Note 1)
(Note 1)
f
f
f
IN
X1
X1
X1
SS
= 0 mA
DD
SS
DD
DD
= 20 MHz
= 20 MHz
= 20 MHz
<V
= 0 V
= 5.0 V
= 5 V
= 5 V
IN
<AV
DD
AV
DV
DV
–500
–520
–293
–3.1
Min
DD
300
150
–60
DD
–40
10
–
–
–
–
–
–
SS
–3.0
–0.6
AV
DV
(Note 8)
DV
+500
–300
–150
Max
+3.1
DD
520
293
+60
+40
180
300
SS
40
40
80
–
DD
–1.5
+0.6
Unit
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
K
V
V
V
V
A