PRELIMINARY
CM3132
ELECTRICAL OPERATING CHARACTERISTICS (CONT’D) (SEE NOTE1)
VTT Regulator Parameters
VTT
Output Voltage Range
Output Voltage Range
Load Regulation
VDDQ = 2.5V, ITT = 0.01A,
IDDQ = 0A
1.20
1.225
-1.0
1.25
1.250
-
1.30
1.275
1.0
V
V
VTT REF
VCC = 0V, VDDQ = 2.500V,
ITT = 0.01A
VTT LD
TA = 25°C, VDDQ = 2.5V,
%
0.01A ≤ ITT ≤ 0.5A
eN TT
ITT LIM
ITT SC
Output Noise Voltage
Current Limit
BW = 10Hz - 100kHz, CTT = 10µF
51
0.8
0.3
µVrms
0.6
A
A
Short Circuit Current
VTT < 0.7V
VCORE Regulator Parameters
VCC MIN Input Voltage
VCORE = 1.5V, ICORE = 1.5A,
SENSE_CORE = 0V, Note 3
2.2
1.45
1.2
-
V
V
VCORE DEF Default Output Voltage Range
VCC = 3.3V, ICORE = 0.01A,
SENSE_CORE = 0V
1.50
1.55
1.8
VCORE ADJ Adjustable Output Voltage
Range
VCC = 3.3V, SENSE_CORE from
resistors R3 & R4, Note 4
V
VCORE LD Load Regulation
TA = 25°C, VCC = 3.3V,
-
-
2.5
%
0.01A ≤ ICORE ≤ 1.5
VCORE LINE Line Regulation
-1.0
1.7
1.0
%
TA = 25°C, 2.8V ≤ VCC ≤ 3.6V,
ICORE = 0.01A
eN CORE
Output Noise Voltage
BW = 10Hz - 100kHz, CCORE = 47µF
59
2.0
0.5
µVrms
ICORE LIM Current Limit
A
A
ICORE SC Short Circuit Current
VCORE < 0.3V
Note 1: All parameters specified at TA = 0°C to +85°C unless otherwise noted.
Note 2: Note that the IDDQ current specified is the load current output from the VDDQ pin. VDDQ also supplies current internally to the
VTT regulator when it is sourcing current. The maximum source current can be up to 0.5A.The maximum total current from
the VDDQ regulator is the external VDDQ current IDDQ added to the maximum VTT sourcing current ITT. All load currents are
specified as such, but the VDDQ current limit is specified at a current just above the total maximum current.
Note 3: VCORE regulator only. Refer to VDDQ regulator parameters for VDDQ regulator.
R3
Note 4: VCORE = 1.15V X (1 + ------- )
R4
VDDQ OUT
VDDQ
0V
VTT OUT
VDDQ / 2
0V
VCC(1)
EN_DDR
2.8V to 3.6V
Low
X
High
Table 1: Truth Table for CM3132
© 2004 California Micro Devices Corp. All rights reserved.
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5
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