T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
14 Comparators (continued)
Table 112 shows the major characteristics of the comparators.
Table 112. Comparator Characteristics
Parameter
Input Common Mode (VCM)
Input Offset Voltage
Gain
Conditions
Min
0
Nom
—
Max
3.2
15
—
Unit
V
—
0 < VCM < 3.2
VCM = 1, f = 10 kHz
VCM = 1, f = 10 kHz
VCM = 1, f = 10 kHz
—
−15
—
—
mV
dB
124
85
CMRR
—
—
dB
PSRR
—
79
—
dB
dc Power Dissipation
Standby Power Dissipation
—
0.8
—
1.5
3
mW
µW
—
—
14.1 Comparators Register Set
Table 113. CME: Comparator Enable (0x4C)
Reg
R/W
Bit 7
—
Bit 6
CMV.2
—
Bit 5
CMV.1
—
Bit 4
CMV.0
—
Bit 3
—
Bit 2
CME.2
0
Bit 1
CME.1
0
Bit 0
CME.0
0
CME
R/W
RESET Default
0
0
Bit #
7
Symbol
Name/Description
—
Reserved. Program to 0.
6—4
Comparator [2:0] Value (Read-Only Field). These status bits indicate the current state
of the corresponding comparator output.
CMV.[2:0]
3
—
Reserved. Program to 0.
2—0
CME.[2:0]
Comparator [2:0] Enable.
0: Comparator disabled (powerdown mode).
1: Comparator active.
Note: On powerdown, any pending interrupts are reset.
Table 114. CMT: Comparator Transition Polarity (0x4D)
Reg
R/W
Bit 7
—
Bit 6
CMV.2
—
Bit 5
CMV.1
—
Bit 4
CMV.0
—
Bit 3
—
Bit 2
CMT.2
1
Bit 1
CMT.1
1
Bit 0
CMT.0
1
CMT
R/W
RESET Default
0
0
Bit #
7
Symbol
Name/Description
—
Reserved. Program to 0.
6—4
Comparator [2:0] Value (Read-Only Field). These status bits indicate the current state
of the corresponding comparator output.
CMV.[2:0]
3
—
Reserved. Program to 0.
2—0
CMT.[2:0]
Comparator [2:0] Transition Polarity.
0: Interrupt on 1-to-0 transition.
1: Interrupt on 0-to-1 transition.
106
Lucent Technologies Inc.
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