TABLE 5
79C940
DC CHARACTERISTICS (Continued)
Parameter
Symbol
I
AODOFF
V
AOCM
V
OD
I
V
ATH
V
ASQ
V
IRDVD
V
ICM
V
OPD
Parameter Description
Transmit Differential
Output Idle Current
DO± Common Mode
Output Voltage
DO± Differential Output
Voltage Imbalance
Receive Data Differential
Input Threshold
DI± and CI± Differential
Input Threshold Squelch
DI± and CI± Differential
Mode Input Voltage Range
DI± and CI± Input Bias
Voltage
Test Conditions
R
L
= 78
Ω
R
L
= 78
Ω
R
L
= 78
Ω
(Note 6)
R
L
= 78
Ω
(Note 6)
R
L
= 78
Ω
(Note 6)
Min
–1
2.5
–25
–35
–160
Max
+1
AVDD
25
35
–275
1.5
I
IN
= 0 mA
AV
DD
–3.0
AV
DD
–0.8
–100
Unit
mA
V
mV
mV
mV
V
V
mV
DI± Undershoot Voltage at Zero (Note 5)
Differential on Transmit Return
to Zero (ETD)
Power Supply Current
Power Supply Current
Power Supply Current
Power Supply Current
SCLK = 25 MHz
XTAL1 = 20 MHz
SLEEP Asserted, AWAKE = 0
RWAKE = 1 (Note 7)
SLEEP Asserted, AWAKE = 1
RWAKE = 0 (Note 7)
SLEEP Asserted, AWAKE = 0
RWAKE = 1 (Note 7)
AV
SS
< V
IN
< AV
DD
(Note 8)
I
IN
= 0 mA
AV
DD
= +5V
Sinusoid
5 MHz
≤
f
≤10
MHz
Sinusoid
5 MHz
≤
f
≤10
MHz
Sinusoid
5 MHz
≤
f
≤10
MHz
Sinusoid
5 MHz
≤
f
≤10
MHz
LRT = LOW
LRT = LOW
LRT = LOW
–500
10
AV
DD
–3.0
–3.1
300
–520
150
–293
180
–312
90
I
DD
I
DDSLEEP
I
DDSLEEP
I
DDSLEEP
75
100
10
20
500
mA
µA
mA
mA
µA
KΩ
Twisted Pair Interface
Input Current at RXD±
I
IRXD
RXD± Differential Input
R
RXD
Resistance
RXD±, RXD– Open Circuit
V
TIVB
Input Voltage (Bias)
Differential Mode Input
V
TIDV
Voltage Range (RXD±)
RXD Positive Squelch
V
TSQ+
Threshold (Peak)
RXD Negative Squelch
V
TSQ–
Threshold (Peak)
RXD Post-Squelch
V
THS+
Positive Threshold (Peak)
RXD Post-Squelch
V
THS–
Negative Threshold) (Peak)
RXD Positive Squelch
V
LTSQ+
Threshold (Peak)
RXD Negative Squelch
V
LTSQ–
Threshold (Peak)
RXD Post-Squelch Positive
V
LTHS+
Threshold (Peak)
AV
DD
–1.5
+3.1
520
–300
293
–150
312
–180
156
V
V
mV
mV
mV
mV
mV
mV
mV
Specification Number 79C940B-CI (A) Rev C
Page 8 of 13
91
ROCHESTER [ Rochester Electronics ]
